Class / Patent application number | Description | Number of patent applications / Date published |
324676000 | With pulse signal processing circuit | 52 |
20080218182 | Controlling Method for Capacitive Sensors - A controlling method for capacitive sensors in a vibrating mirror motor system includes a capacitive sensor, a subtraction circuit and an adder circuit connected to the capacitive sensor, a high frequency power supply providing power for the capacitive sensor, a D/A converter, and a gain stage adjustment device, wherein values obtained at the capacitive sensor are summed through the adder circuit, then the summed value and a value processed by the D/A converter are input to a comparator which comparing the values, and a gain adjusting value is obtained and supplied to the high frequency power supply, meanwhile the values obtained by capacitive sensor are subtracted by the subtraction circuit and then adjusted by the gain stage adjustment device, finally a position signal is outputted. | 09-11-2008 |
20080238447 | ISOLATED CAPACITIVE SIGNATURE DETECTION FOR POWERED DEVICES - In one embodiment, a method for determining capacitive signature validity of a powered device (PD) attached to power sourcing equipment (PSE) having (i) an isolated side with a primary coil and (ii) a line side with a secondary coil connected to the PD. The method includes determining, on the isolated side, a first time T | 10-02-2008 |
20080303536 | Electronic Circuit with Capacitive Switching Ability - Electronic circuit for the detection of a capacitive variation on two distinct contact capacitors, (C | 12-11-2008 |
20090201033 | METHODS FOR MEASUREMENT AND CHARACTERIZATION OF INTERFEROMETRIC MODULATORS - Various methods are described to characterize interferometric modulators or similar devices. Measured voltages across interferometric modulators may be used to characterize transition voltages of the interferometric modulators. Measured currents may be analyzed by integration of measured current to provide an indication of a dynamic response of the interferometric modulator. Frequency analysis may be used to provide an indication of a hysteresis window of the interferometric modulator or mechanical properties of the interferometric modulator. Capacitance may be determined through signal correlation, and spread-spectrum analysis may be used to minimize the effect of noise or interference on measurements of various interferometric modulator parameters. | 08-13-2009 |
20100001746 | Method for selecting an item of equipment and control unit enabling this method to be implemented - A group of home automation equipment ( | 01-07-2010 |
20100102831 | Capacitance Measurement Circuit and Capacitance Measurement Method Thereof - A capacitance measurement circuit and a capacitance measurement method thereof. The capacitance measurement circuit for measuring a capacitor under test includes a capacitance to time unit, a continuous time integrator and an analog to digital converter. The capacitance to time unit generates a first clock signal and a second clock signal reverse to the first clock signal according to a first charge time of the capacitor under test and a second charge time of a variable capacitor. The continuous time integrator receives the first clock signal and outputs an integral signal according to the first clock signal. When the number of clocks of the second clock signal is equal to a default value, the analog to digital converter outputs a digital signal corresponding to a capacitance difference between the capacitor under test and the variable capacitor according to the integral signal. | 04-29-2010 |
20100176823 | Apparatus and Method for Detecting Finger Activity on a Fingerprint Sensor - An apparatus and method for detecting the presence of a finger on a fingerprint sensor is disclosed in one embodiment of the invention as including transmitting a probing signal, comprising a series of probing pulses, to a fingerprint sensing area. A response signal, comprising a series of response pulses, is received from the fingerprint sensing area in response to the probing signal. An upper reference signal is generated and finger activity is detected on the fingerprint sensing area by monitoring whether the peaks of the response pulses exceed the reference signal. | 07-15-2010 |
20100301878 | APPARATUS FOR ASCERTAINING AND/OR MONITORING AT LEAST ONE FILL LEVEL OF AT LEAST ONE MEDIUM IN A CONTAINER ACCORDING TO A TRAVEL-TIME MEASURING METHOD AND/OR A CAPACITIVE MEASURING METHOD - An apparatus for ascertaining and/or monitoring at least one fill-level of at least one medium in a container according to a travel-time measuring method and/or a capacitive measuring method by means of at least one measuring probe. The apparatus comprises a capacitive measurement circuit, a time-domain reflectometer measurement circuit, and a control/evaluation unit. There invention results from the provision of a diplexer, which sends the low-frequency measurement signal and the high-frequency, electromagnetic measurement signal to the measuring probe and effects a signal separation of the high-frequency, electromagnetic measurement signal into the first signal path of the time-domain reflectometer measurement circuit and the low-frequency measurement signal into the second signal path of the capacitive measurement circuit. | 12-02-2010 |
20110018558 | ELECTROSTATIC SENSOR - Multiple sensor capacitors Cd are respectively assigned to multiple buttons B | 01-27-2011 |
20110068810 | SENSING METHOD AND DRIVING CIRCUIT OF CAPACITIVE TOUCH SCREEN - In a sensing method of a capacitive touch screen, which includes a plurality of sensing capacitors, at least one of the plurality of sensing capacitors is selected into a reference capacitor unit. The capacitance differences between the reference capacitor unit and the sensing capacitors are calculated. A touched position on the capacitive touch screen is determined according to the capacitance differences. | 03-24-2011 |
20110074445 | CAPACITANCE SENSING WITH MISMATCH COMPENSATION - Systems and methods are provided for determining the value of a capacitance. A system for sensing capacitance comprises an oscillator arrangement comprising a plurality of oscillators and a mismatch compensation arrangement coupled between the oscillator arrangement and a first capacitive element having a first capacitance. The mismatch compensation arrangement is configured to selectively couple the first capacitive element to a respective oscillator of the plurality of oscillators, wherein an oscillation frequency of the respective oscillator is influenced by the first capacitance. | 03-31-2011 |
20120019264 | MULTI PURPOSE CAPACITIVE SENSOR - A multi purpose capacitive sensor which is suitable for indicating close proximity of a person to a surface along a large-size truck as well as along a medium-size painting. A voltage measuring device is provided with a signal ground connected to a first pole of an oscillating voltage source that has a second pole connected to earth and that is connected to an input of the voltage measuring device via a voltage divider with a capacitive series link arranged between the input and earth and a shunt link arranged between the input and the signal ground. The signal ground is connected to electrically conductive means extended along the surface and the oscillating voltage source is connected to earth via a second voltage divider in which a capacitive series link is arranged between the earth and the second pole. | 01-26-2012 |
20120068724 | CAPACITANCE EVALUATION CIRCUIT AND ELECTRONIC DEVICE USING THE SAME - A capacitance evaluation circuit includes a capacitive voltage divider, an analog-to-digital converter (ADC) and a processing module. The capacitive voltage divider includes a switch circuit, a known capacitor and a capacitor under test. The switch circuit is controlled by first and second clock signals. A voltage variation at a first terminal of the known capacitor is coupled to a first terminal of the capacitor under test based on a conduction state of the switch circuit. The ADC converts a voltage on the first terminal of the capacitor under test into a digital signal. The processing module detects a capacitance and a capacitance variation of the capacitor under test according to the digital signal from the ADC and a parameter of the ADC. | 03-22-2012 |
20120133376 | Sensing Device and Method - A sensing device includes an oscillator, a driver, a switch, a counter and a timer. The oscillator includes an input coupled to a reference capacitor. The driver alternately sources and sinks current in accordance with an oscillation signal outputted by the oscillator. The switch connects or disconnects the reference capacitor with a sensing capacitor. The counter counts value for the oscillation signal. The timer counts operation periods respectively when the switch connects the reference capacitor with the sensing capacitor and when the switch disconnects the reference capacitor with the sensing capacitor, and the counter counts values corresponding to conditions of the switch connecting and disconnecting the reference capacitor with the sensing capacitor during the operation periods, respectively. | 05-31-2012 |
20130134995 | TOUCH SENSOR AND OPERATING METHOD THEREOF - A touch sensor includes: a pulse signal generator for generating a pulse signal of which pulse width is calibrated in response to a control code; a pulse signal transmitter for transmitting the pulse signal when a touch object is out of contact with a touch pad and stopping transmitting the pulse signal when the touch object is in contact with the touch pad; a pulse signal detector for detecting the pulse signal transmitted through the pulse signal transmitter; and a controller recognizing a non-contact state and adjusting the control code to calibrate the pulse width of the pulse signal when the pulse signal detector detects the pulse signal. In the above-described configuration, the contact of the touch object with the touch pad can be sensed more precisely, and the occurrence of a malfunction in the touch sensor due to changed operating conditions can be prevented. | 05-30-2013 |
20130214798 | CAPACITANCE MEASUREMENT CIRCUIT AND METHOD FOR MEASURING CAPACITANCE THEREOF - Provided are a capacitance measurement circuit and method. In the capacitance measurement circuit and method, a control unit generates a control code a predetermined number of times according to designated rules regardless of the level of a sensing signal, and the control code is changed to measure a capacitance value when the level of the sensing signal corresponding to the generated control code is determined to be normal. Consequently, the measured capacitance value is hardly affected by noise and can be stably output. | 08-22-2013 |
20130314107 | DEVICE AND METHOD FOR DETERMINING A MEASURING CAPACITANCE - A measuring device determines a measuring capacitance (CM), with a clock oscillator, which oscillates in a scanning frequency (f | 11-28-2013 |
20140118011 | Method and Sensor Device for the Detection of a Gripping of a Hand-Held Device - A method for the detection of a gripping of a hand-held device with one hand, using a capacitive sensor device, uses at least one transmitting electrode, at least one compensating electrode and at least one receiving electrode. An electrical signal is tapped at the receiving electrode and the sensor device can be operated in a first operating mode and in a second operating mode. In the first operating mode, a first alternating electrical signal is applied to the transmitting electrode and a second alternating electrical signal is applied to the compensating electrode. In the second operating mode, the second alternating signal is only applied to the compensating electrode. Furthermore, a sensor device can be provided which is configured to perform the method as described above. | 05-01-2014 |
20140176162 | Arrangement and Method for Capacitive Sensing of the Rotary Movement of a Rotary Element - A configuration and a method for capacitative sensing of the rotatory motion of a rotary member are described, whereby the configuration has four electrodes ( | 06-26-2014 |
20150077141 | Capacitive sensor for an anti-collision apparatus, and capacitive sensor - A capacitive sensor is configured for detecting an object, in particular for detecting a collision in the case of a movable vehicle part, and an anti-collision apparatus has such a sensor. The sensor has an electrode arrangement with at least one transmitting electrode and at least one or more receiving electrodes. The sensor has a signal generation circuit which is connected upstream of the at least one transmitting electrode. The signal generation circuit generates a transmission signal in the form of a square-wave pulse signal corresponding directly to a pseudo-random bit string. | 03-19-2015 |
20160123778 | ROTATION STATE DETECTION DEVICE - A rotation state detection device is applied to an operation device having a rotating body that rotates in response to an input of an operation force, and a supporting body that supports the rotating body rotatably. The rotation state detection device includes: a first electrode arranged at the rotating body; and a second electrode arranged at the supporting body and generating a capacitance with the first electrode. The first electrode and the second electrode are arranged to vary the capacitance periodically each time the rotating body rotates by a predetermined angle and make a shape of a capacitance waveform representing a change in the capacitance to be different. A rotational angle of the rotating body is calculated based on the number of periodic times the capacitance varies, and a rotational direction of the rotating body is determined based on the shape of the capacitance waveform. | 05-05-2016 |
20160153848 | BEARING NUT FOR MEASURING THE ROTATIONAL SPEED OF A SHAFT CONNECTED TO A TURBOMACHINE AND ASSOCIATED MEASURING DEVICE | 06-02-2016 |
324677000 | Including R/C time constant circuit | 5 |
20080303537 | Capacitive Proximity Sensor - An arrangement serves the purpose of monitoring an object such as a door for changes in a field surrounding the object. A sensor-active region having a measurement area ( | 12-11-2008 |
20090085584 | SUBSYSTEMS AND METHODS FOR USE IN PATCH CLAMP SYSTEMS - Subsystems and methods for use in patch clamp systems are provided. For example, in certain embodiments, compensation circuitry is used to compensate for non-idealities present in the patch clamp system. The accuracy of this compensation may be verified by employing, for example, circuitry that models the patch clamp system. | 04-02-2009 |
20120019265 | CAPACITIVE TOUCH PANEL - Changes of the stray capacitances of a large number of sensing electrodes can be detected simultaneously. Further, even if a stray capacitance changes slightly, an input operation to a sensing electrode can be detected based on elapsed time until the electric potential of the sensing electrode becomes the same as a threshold potential. The stray capacitance of a sensing electrode and a resistor of the sensing electrode form a CR time constant circuit. Charge or discharge of the stray capacitance of the sensing electrode is controlled while a rest time in a predetermined time ratio is set. A stray capacitance that slightly increases in response to an input operation made near a sensing electrode can be detected by detecting the stray capacitance in extended elapsed time until the electric potential of the sensing electrode becomes the same as the threshold potential. | 01-26-2012 |
20120161794 | SYNC SIGNAL GENERATOR FOR A CAPACITIVE SENSOR - A sync signal generator for a capacitive sensor includes a charge amplifier having an input for coupling to an inactive receive line in the capacitive sensor, a first comparator having a first input for receiving a first threshold voltage, a second input coupled to an output of the charge amplifier, and an output for providing a first sync signal, and a second comparator having a first input for receiving a second threshold voltage, a second input coupled to the output of the charge amplifier, and an output for providing a second sync signal. The charge amplifier includes an operational amplifier having a feedback circuit including a capacitor and a switch. The first threshold voltage is provided by a first digital-to-analog converter, and the second threshold voltage is provided by a second digital-to-analog converter. | 06-28-2012 |
20130082720 | RC CALIBRATION USING CHOPPING - A method and apparatus for determining an RC (resistive-capacitive) time constant is disclosed. In one embodiment, a method comprises determining a first period of oscillation when an oscillator is operating in a first configuration. The method further the method further comprises determining a second period of oscillation when the oscillator is operating in a second configuration. A measurement circuit is configured to determine a resistive-capacitive (RC) time constant of the oscillator by determining a mean of the first and second periods. | 04-04-2013 |
324678000 | Including charge or discharge cycle circuit | 25 |
20080246495 | Detection apparatus for a capacitive proximity sensor - A switched capacitance detection circuit is responsive to changes in the fringing capacitance of a capacitive proximity sensor having at least one capacitive sensor element. In cases where the sensor has a single sensor element, the switching frequency of the detection circuit is controlled to maintain measurement accuracy in the presence of sensor moisture while minimizing power consumption and electromagnetic radiation. In cases where the sensor has multiple sensor elements, the capacitance values for each sensor element are differenced, absolute-valued and summed to form an output in which common-mode effects due to sensor moisture, temperature and sensor aging are canceled out. | 10-09-2008 |
20080258740 | SELF-CALIBRATING DRIVER - A self-calibration system includes a variable current source to generate a default source current for charging a capacitive load, and a load charge calibrator to detect a voltage associated with the capacitive load when charged by the default source current, and to generate a current control feedback according to the detected voltage and a desired charged voltage of the capacitive load, the current control feedback to indicate to the variable current source a charge current capable of charging the capacitive load to the desired charged voltage. | 10-23-2008 |
20090027068 | Proximity Sensor - A capacitive touch sensor providing an automatic switch-off function for an apparatus in which the sensor is incorporated is provided. The sensor comprises a sensing element coupled to a capacitance measurement circuit for measuring the capacitance of the sensing element. A control circuit is operable to determine from the capacitance measurement whether an object is in proximity with the sensor. The determined presence of an object may be used to toggle a function of the apparatus. Furthermore, when it is determined that an object has not been in proximity with the sensor for a predetermined time duration, an output signal for switching off the apparatus is provided. The predetermined time duration may be selected from a number of predefined time durations, or may be programmed using an resistor-capacitor network. Pulses may be applied to the control circuit to override features of the automatic switch-off functionality. | 01-29-2009 |
20090167326 | TIME-SLOPED CAPACITANCE MEASURING CIRCUITS AND METHODS - Time-sloped capacitance measuring circuits use the time to ramp voltage signals between reference levels to determine an unknown capacitance, where the ramping time is determined by the cumulative whole number of clock cycles counted during voltage signal ramping over multiple ramp cycles. Measurement resolution can be improved by adjusting a starting voltage level for subsequent voltage signal ramps by an amount that compensates for incremental voltage ramping during a terminal clock cycle of a previous voltage signal ramp. | 07-02-2009 |
20090174416 | METHODS AND SYSTEMS FOR DETECTING A CAPACITANCE USING SWITCHED CHARGE TRANSFER TECHNIQUES - Methods, systems and devices are described for detecting a measurable capacitance using charge transfer techniques. According to various embodiments, a charge transfer process is performed for two or more times. During the charge transfer process, a pre-determined voltage is applied to the measurable capacitance, and the measurable capacitance is then allowed to share charge with a filter capacitance through a passive impedance that remains coupled to both the measurable capacitance and to the filter capacitance throughout the charge transfer process. The value of the measurable capacitance can then be determined as a function of a representation of a charge on the filter capacitance and the number of times that the charge transfer process was performed. Such a detection scheme may be readily implemented using conventional components, and can be particularly useful in sensing the position of a finger, stylus or other object with respect to an input sensor. | 07-09-2009 |
20090219038 | PULSE CIRCUIT USING A TRANSMISSION LINE - A circuit is provided wherein a test pulse is provided to a device under test. A module allows the test pulse to pass through to the device under test. The module blocks a reflected pulse from passing through to the device under test when the reflected pulse has an opposite polarity from the polarity of the test pulse. In some cases, the reflected pulse may be detrimental to the device under test if it is not prevented from reaching the device under test. In one embodiment, when a second reflected test pulse is traveling away from the device under test, the module allows the second reflected test pulse to pass through. | 09-03-2009 |
20100007361 | POWER SUPPLY DEVICE AND SEQUENCER SYSTEM - A smoothing unit includes a first and a second smoothing capacitors, a first and a second discharge resistors connected in parallel to both ends of the first and the second smoothing capacitors, respectively. During a normal operation, both the first and the second smoothing capacitors are connected electrically to a live line. On the other hand, during a degradation diagnosis, the first and the second smoothing capacitors are alternately connected electrically to the live line at a predetermined timing, and a smoothing capacitor not electrically connected to the live line is subjected to the degradation diagnosis. | 01-14-2010 |
20100097077 | SENSOR AND METHOD OF SENSING - A touch sensor senses the presence of an object at one of a plurality of channels on a surface of the touch sensor, wherein proximity of the object to the touch sensor results in a change in capacitance at the position of the channel. The touch sensor includes a drive circuit and a charge sensing circuit, each coupled to each of the channels. The charge sensing circuit includes at least one charge measurement capacitor. A measurement cycle is applied to the touch sensor having a drive portion and a sense portion. During the drive portion a charge is applied to the channels and therefore the charge measurement capacitors of the touch sensor, and during a sense portion the charge measurement capacitors are discharged by a predetermined amount and the remaining charge on the charge measurement capacitors is measured. | 04-22-2010 |
20100127717 | SYSTEM AND METHOD FOR DETERMINING TOUCH POSITIONS BASED ON PASSIVELY-INDUCED POSITION-DEPENDENT ELECTRICAL CHARGES - Systems and methods determine the position of a touch on a surface of a device, such as a touch-sensitive device, by using passively-induced position-dependent electrical charges. In such a method, the position of a touching implement is determined on the sensing surface of a device. The method includes charging the sensing surface during a first time period by connecting all four corners of the sensing surface to a reference voltage, and over a second time period discharging two adjacent corners of the sensing surface into an integrator capacitor while connecting the two opposite corners to ground. The first and second time periods together form a charge/discharge cycle that is repeated a plurality of times, after which an output of the integrator capacitor is measured. This sequence is performed for each of the four pairs of adjacent corners of the sensing surface, resulting in four integrator capacitor output measurements, each of the four measurements being associated with a different sensing surface edge. The position of the touching implement on the sensing surface is then calculated using the four charge measurements. | 05-27-2010 |
20100141275 | Electrostatic capacitance detection device, electrostatic capacitance detection circuit, electrostatic capacitance detection method, and initialization method - Provided are an electrostatic capacitance detection circuit and an electrostatic capacitance detection method with which being capable of detecting minute change in electrostatic capacitance from which offset is removed for detection of approach of an object or the like, at high speed and high resolution while selecting an optimum detection range, with such a simpler configuration as to add a resistor and a capacitor to one input/output port of a general-purpose microcomputer. In the electrostatic capacitance detection circuit and the electrostatic capacitance detection method, a voltage waveform generated by the added capacitor is compared with a threshold voltage while controlling a DC component of the voltage waveform to change in correspondence with the change in electrostatic capacitance and an AC component of the voltage waveform to correspond to a width of a detection range. | 06-10-2010 |
20100148805 | Fail-Safe System and Test Module, Notably For Use In A Railroad Signaling System - A fail-safe system, notably for use in a railroad signaling system, comprising a test module with a photovoltaic coupler able to charge a capacitor. The energy stored in the capacitor provides power supply to a circuit under test. Advantageously, means of measuring a state of charge of the capacitor make it possible to quantify current leaks from the circuit under test. | 06-17-2010 |
20100219845 | Method and Apparatus for Sensing - An apparatus for sensing a change in capacitance of a sensing electrode to a system ground, such as that which may be used to form a touch sensor, with the sensing electrode forming touch sensitive surface is arranged to include a sleep mode of operation. The apparatus includes a sample capacitor having a first terminal coupled to the sensing electrode, and a second terminal coupled to a voltage measurement circuit. The voltage measurement circuit is arranged in operation to determine a voltage at the second terminal of the sample capacitor. A voltage biasing arrangement is arranged under the control of a controller to apply a biasing voltage or the system ground to the first terminal or the second terminal of the sample capacitor in accordance with a measurement cycle. The measurement cycle includes an initialisation part, a charging part in which the sensing electrode is charged via the sample capacitor, and a measurement part in which a voltage at the second terminal is measured and it is determined whether there has been a change in capacitance of the sensing electrode in accordance with the measured voltage. Before or after the measurement cycle, the controller is arranged to enter the sleep mode in which the sensing electrode is biased at a voltage which is greater than the system ground, whilst the second terminal of the sample capacitor is floated by not applying the system ground or a biasing voltage, so that the sensing electrode is held at a voltage above the system ground during the sleep mode. | 09-02-2010 |
20100244858 | Embedded sar based active gain capacitance measurement system and method - A system for measuring a capacitor (C | 09-30-2010 |
20100244859 | Deconvolution-based capacitive touch detection circuit and method - A capacitance measuring system includes analog-digital circuitry ( | 09-30-2010 |
20110001494 | METHODS AND SYSTEMS FOR SIGMA DELTA CAPACITANCE MEASURING USING SHARED COMPONENTS - Methods, systems and devices are described for detecting a measurable capacitance using sigma-delta charge transfer techniques that can be implemented with many standard microcontrollers, and can share components to reduce device complexity and improve performance. In the various implementations of this embodiment, the passive network used to accumulate charge can be shared between multiple measurable capacitances. A switch or IO controlling the charge sharing and/or charge changing can also be shared Likewise, in various implementations a voltage conditioning circuit configured to provide a variable reference voltage can be shared between multiple measurable capacitances. Finally, in various implementations a guarding electrode configured to guard the measurable capacitances can be shared between multiple measurable capacitances. In each of these cases, sharing components can reduce device complexity and improve performance. | 01-06-2011 |
20110031984 | TEST APPARATUS - Provided is a test apparatus that tests a device under test, comprising a power supply that generates power supplied to the device under test; a transmission path that transmits the power generated by the power supply to the device under test; a current measuring section that measures a digital waveform of load current supplied to the device under test via the transmission path, the digital waveform including a frequency component higher than a frequency corresponding to a product of an inductance component of the power supply and a capacitance component between the transmission path and a ground potential; and a judging section that judges acceptability of the device under test based on the digital waveform of the load current measured by the current measuring section. | 02-10-2011 |
20110101998 | Operating parameter monitoring circuit and method - A monitoring circuit | 05-05-2011 |
20110133757 | Apparatus and method for evaluating capacitor - There is provided an apparatus for evaluating a capacitor, including: a charge/discharge control unit | 06-09-2011 |
20110163766 | CAPACITANCE MEASUREMENT CIRCUIT WITH DYNAMIC FEEDBACK - Methods, devices, and systems that measure capacitance are disclosed. Typically, an accumulator circuit couples to the capacitance and includes an accumulator and switch(es) that charge the accumulator over a series of switch-controlled charging or discharging cycles governed by a first control signal. The accumulator circuit provides an accumulator signal based on the charge on the first accumulator. A discharge circuit couples to the accumulator circuit and includes an optional variable current device, the discharge circuit partially discharging the accumulator based on a second control signal. A control circuit, which couples to the accumulator circuit and the discharge circuit, dynamically adjusts the first and/or second control signals to keep the accumulator signal in a desired range. The dynamically adjusted control signal can be used as a measure of the capacitance. Such methods and systems may be used in capacitive touch sensing devices such as capacitive buttons and capacitive touch panels. | 07-07-2011 |
20110273192 | CAPACITANCE MEASUREMENT DEVICE FOR A TOUCH CONTROL DEVICE - A capacitance measurement device includes a charging control unit for charging a measured capacitor, a discharging control unit for discharging the measured capacitor, a first switch coupled to the measured capacitor and the charging control unit for controlling a connection between the measured capacitor and the charging control unit according to a first switching signal, a second switch coupled to the measured capacitor and the discharging control unit for controlling a connection between the measured capacitor and the discharging control unit according to a second switching signal, a first A/D converter coupled to the measured capacitor for converting a voltage signal on the measured capacitor into a first signal, and a duty cycle detecting circuit coupled to the measured capacitor for converting the voltage signal on the measured capacitor into a count value that represents the capacitance of the measured capacitor and outputting the count value to a processing unit. | 11-10-2011 |
20110273193 | TOUCH DETECTION METHOD AND RELATED TOUCH CONTROL DEVICE - A touch detection method for a touch control device including a touch panel includes examining whether a charging capacity for charging a measured capacitor of the touch panel and a discharging capacity for discharging the measured capacitor are determined; charging and discharging the measured capacitor by using the charging capacity and the discharging capacity when the charging capacity and the discharging capacity are determined and receiving a count value representing the capacitance of the measured capacitor, examining whether a base count value is set, calculating a difference between the count value and the base count value when the base count value is set, for determining whether the touch panel is touched, examining whether the count value is in a predetermined range, and performing a charging and discharging capacity setting process when the count value is out of the predetermined range, for adjusting the charging capacity and the discharging capacity. | 11-10-2011 |
20130027061 | Measuring Voltage - In one embodiment, a method includes, at a first input of a comparator, receiving from an analog multiplexer one of multiple first voltages. Each of the first voltages results at least in part from an interaction between an object and an electrode of each of one or more nodes of a capacitive touch sensor. The method includes, at a second input of the comparator, receiving a second voltage across a measurement capacitor that has a first terminal coupled to the second input of the comparator. The method includes charging the measurement capacitor at least in part through a measurement resistor coupled in series to the first terminal of the measurement capacitor and monitoring an output of the comparator during the charging of the measurement capacitor. The output of the comparator changes state when the second voltage becomes approximately equal to or greater than the one of the first voltages. The method includes determining an amount of time from a start of the charging of the measurement capacitor to a change in state of the output of the comparator. | 01-31-2013 |
20140368223 | CAPACITANCE MEASUREMENT DEVICE AND ELECTRONIC DEVICE THEREOF - A capacitance measurement device for measuring the capacitance of a measured capacitor includes a charging control unit for charging the measured capacitor; a discharging control unit for discharging the measured capacitor; a voltage converting circuit coupled to the measured capacitor, for converting a voltage signal on the measured capacitor into a value that represents the capacitance of the measured capacitor; wherein in a first period, one of the charging control unit and the discharge control unit charges/discharges the measured capacitor and in a second period after the first period, the other one of the charging control unit and the discharge control unit discharges/charges the measured capacitor. | 12-18-2014 |
20150054528 | EMBEDDED SAR BASED ACTIVE GAIN CAPACITANCE MEASUREMENT SYSTEM AND METHOD - A system for measuring a capacitor (C | 02-26-2015 |
20150145534 | CAPACITIVE SENSING CIRCUIT FOR SENSING CAPACITANCE VARIATION WITH CHARGE CLONE - The present invention provides a capacitive sensing circuit, comprising at least one capacitor to be measured, an integral capacitor, a first current mirror having a first current path and a second current path. A first current is generated in the first current path so as to charge the capacitor to be measured, while a second current mirrored from the first current is generated in the second current path so as to charge the integral capacitor. As such, the mirrored current, resulted from mirroring the charging current on the capacitor to be measured, is used to charge the integral capacitor. Charge energy charged on the capacitor to be measured may be copied onto the integral capacitor so as to reflect a voltage signal. Subsequently, capacitance variation generated when the capacitor to be measured is touched may be sensed by detecting the voltage signal. | 05-28-2015 |