Patent application number | Description | Published |
20120204415 | Process for Producing an Acoustic Device Having a Controlled-Bandgap Phononic Crystal Structure Containing Conical Inclusions - A process for producing an acoustic device having a phononic crystal structure comprising inclusions produced in a first medium distributed in a matrix of a second medium, to block propagation of acoustic waves within a bandgap frequency band, includes: defining geometric parameters of said inclusions, which have walls contacting said matrix, making at least one non-zero first wall angle, to the normal of the plane of said structure, said geometric parameters including said first wall angle; determining a function relating to variation in frequency position of said bandgap with said wall angle or relating to variation in width of said bandgap with said wall angle; determining said at least first angle, for a selected frequency position and/or selected width of the bandgap, from the function or functions determined beforehand; and producing said inclusions having at least said first wall angle in said matrix formed by said second medium. | 08-16-2012 |
20130214878 | Acoustic Wave Bandpass Filter Comprising Integrated Acoustic Guiding - An acoustic wave bandpass filter comprises at least an input first acoustic wave resonator with an output surface, and an output second acoustic wave resonator with an input surface, said resonators being coupled to each other along a set direction, the input and output surfaces being substantially opposite, and at least one first phononic crystal structure between said input and output resonators and/or a second phonic crystal structure at the periphery of said resonators so as to guide the acoustic waves, generated by said input resonator, toward said output resonator along said set direction, the resonators ensuring an impedance conversion and/or a mode conversion. | 08-22-2013 |
20130214879 | LATERALLY COUPLED BAW FILTER EMPLOYING PHONONIC CRYSTALS - An acoustic wave bandpass filter comprises at least two bulk acoustic wave resonators, laterally coupled to each other acoustically, each resonator including a film of piezoelectric material and at least a first electrode and/or a second electrode, said bulk waves propagating in a direction perpendicular to the plane of the film of piezoelectric material, characterized in that: it further comprises at least a first phononic crystal structure between said resonators such that the transmission coefficient of the lateral acoustic waves can be decreased in a direction parallel to the plane of the piezoelectric film; and the first phononic crystal structure is formed in a matrix of dielectric material or with patterns made from dielectric material. | 08-22-2013 |
Patent application number | Description | Published |
20080265958 | Method for Noise Reduction in a Phase Locked Loop and a Device Having Noise Reduction Capabilities - A method for reducing noise in a device that includes at least one phase locked loop (PLL), the method includes: adjusting at least one adjustable component of a PLL such as to determine a time shift; modulating a frequency divider such as to generate a modulation noise within a modulation noise period and to provide a frequency divided signal; introducing the time shift between the modulation noise period and a measurement period; and measuring, during a measurement period a difference between a reference signal and the frequency divided signal. A device that includes a phased locked loop. The phase locked loop (PLL) includes: a frequency divider, adapted to receive an output signal from a controlled oscillator and to provide a divided frequency signal; a modulator, adapted to affect at least one frequency division characteristic and to introduce a modulation noise during a modulation noise period, a phase detector, adapted to measure, during a measurement period, a difference between a reference signal and the frequency divided signal; and an adjustable delay unit adapted to affect an adjustable time shift between the modulation period and the measurement period. | 10-30-2008 |
20110204962 | HIGH EFFICIENCY DC-DC CONVERTER - A charge pump includes an input, an output, and a fixed voltage node; a first capacitor and at least a second capacitor; and a plurality of switches adapted to selectively couple the first capacitor and the at least the second capacitor to the input, the output, and the fixed voltage node. A switch controller is adapted to switch the plurality of switches in response to at least three phase signals to provide fixed gains. A phase generator is adapted to generate the at least three phase signals, wherein at least one of the at least three phase signals has a duty cycle that is different from at least one other of the at least three phase signals. The phase generator is also adapted to adjust the frequency of a clock signal used to generate the at least three phase signals so that a minimum switching frequency is provided. | 08-25-2011 |
20110309877 | HIGH VOLTAGE CHARGE-PUMP WITH A NOVEL FEEDBACK CONTROL LOOP - A high voltage charge-pump having a feedback control loop is disclosed. The high voltage charge-pump includes a plurality of voltage boosting stages, a low voltage input, and at least one clock input. A sensing charge-pump having a voltage detector output has at least one voltage sensing stage that is communicably coupled to at least one of the plurality of voltage boosting stages. A loop filter in the feedback control loop includes a voltage detector input coupled to the voltage detector output, a voltage reference input, and a voltage error output. A voltage controlled oscillator (VCO) with a variable frequency output has a voltage error input coupled to the voltage error output. The feedback control loop also includes at least one driver having a variable frequency input coupled to the variable frequency output and at least one clock output coupled to the at least one clock input. | 12-22-2011 |
20120175230 | ACTUATION SIGNAL FOR MICROACTUATOR BOUNCE AND RING SUPPRESSION - The present disclosure provides a system and method for controlling positioning of a movable member of a MEMS microactuator to reduce bouncing and ringing. The system includes control circuitry in communication with the MEMS microactuator. The control circuitry is adapted to linearly increase an actuation signal from a first state to a second state to urge the movable member from a first position to a second position and hold the movable member in the second position. The control circuitry is further adapted to linearly decrease the actuation signal from the second state to the first state to release the movable member to the first position. A transition time is not less than the inverse of one quarter of a natural frequency of the movable member as the movable member moves to the first position. | 07-12-2012 |
20120313701 | PSEUDO-ENVELOPE FOLLOWER POWER MANAGEMENT SYSTEM WITH HIGH FREQUENCY RIPPLE CURRENT COMPENSATION - Embodiments disclosed in the detailed description relate to a pseudo-envelope follower power management system including a parallel amplifier and a switch mode power supply converter cooperatively coupled to generate a power supply voltage at a power supply output coupled to a linear RF power amplifier. The parallel amplifier output is in communication with the power amplifier supply output. The parallel amplifier governs operation of the switch mode power supply converter and regulates the power amplifier supply voltage base on a V | 12-13-2012 |
20130088291 | COMBINED FILTER AND TRANSCONDUCTANCE AMPLIFIER - Embodiments of circuitry, which includes an operational transconductance amplifier and a passive circuit, are disclosed. The passive circuit is coupled to the operational transconductance amplifier. Further, the passive circuit receives an input signal and the operational transconductance amplifier provides an output current, such that the passive circuit and the OTA high-pass filter and integrate the input signal to provide the output signal. | 04-11-2013 |
20130106508 | INDUCTANCE BASED PARALLEL AMPLIFIER PHASE COMPENSATION | 05-02-2013 |
20130141169 | LINEAR AMPLIFIER POWER SUPPLY MODULATION FOR ENVELOPE TRACKING - Circuitry, which includes a linear amplifier and a linear amplifier power supply, is disclosed. The linear amplifier at least partially provides an envelope power supply signal to a radio frequency (RF) power amplifier (PA) using a selected one of a group of linear amplifier supply voltages. The linear amplifier power supply provides at least one of the group of linear amplifier supply voltages. Selection of the selected one of the group of linear amplifier supply voltages is based on a desired voltage of the envelope power supply signal. | 06-06-2013 |
20130169245 | NOISE REDUCTION FOR ENVELOPE TRACKING - A direct current (DC)-DC converter, which includes a parallel amplifier, a radio frequency (RF) trap, and a switching supply, is disclosed. The switching supply includes switching circuitry and a first inductive element. The parallel amplifier has a feedback input and a parallel amplifier output. The switching circuitry has a switching circuitry output. The first inductive element is coupled between the switching circuitry output and the feedback input. The RF trap is coupled between the parallel amplifier output and a ground. | 07-04-2013 |
20130176075 | DUAL PARALLEL AMPLIFIER BASED DC-DC CONVERTER - A direct current (DC)-DC converter, which includes switching circuitry, a first parallel amplifier, and a second parallel amplifier, is disclosed. The switching circuitry has a switching circuitry output. The first parallel amplifier has a first feedback input and a first parallel amplifier output. The second parallel amplifier has a second feedback input and a second parallel amplifier output. A first inductive element is coupled between the switching circuitry output and the first feedback input. A second inductive element is coupled between the first feedback input and the second feedback input. | 07-11-2013 |
20130234793 | SPLIT VCC AND COMMON VCC POWER MANAGEMENT ARCHITECTURE FOR ENVELOPE TRACKING - An envelope tracking power supply and transmitter control circuitry are disclosed. The transmitter control circuitry receives a first envelope power supply control signal and a second envelope power supply control signal. The envelope tracking power supply operates in one of a group of operating modes, which includes a first operating mode and a second operating mode. During both the first operating mode and the second operating mode, a first envelope power supply signal is provided to a driver stage based on the first envelope power supply control signal. During the first operating mode, a second envelope power supply signal is provided to a final stage based on the first envelope power supply control signal. However, during the second operating mode, the second envelope power supply signal is provided to the final stage based on the second envelope power supply control signal. | 09-12-2013 |
20130328613 | POWER SOURCE MULTIPLEXER - Circuitry, which includes a first switching transistor element having a first gate, a second switching transistor element having a second gate, a third switching transistor element having a third gate, and a fourth switching transistor element having a fourth gate, is disclosed. The first switching transistor element and the third switching transistor element are coupled in series between a first power source and a first downstream circuit. The second switching transistor element and the fourth switching transistor element are coupled in series between a second power source and the first downstream circuit. A voltage swing at the first gate and a voltage swing at the second gate are both about equal to a first voltage magnitude. A voltage swing at the third gate and a voltage swing at the fourth gate are both about equal to a second voltage magnitude. | 12-12-2013 |
20140062590 | MULTIPLE POWER SUPPLY INPUT PARALLEL AMPLIFIER BASED ENVELOPE TRACKING - A switch mode power supply converter and a parallel amplifier are disclosed. The switch mode power supply converter is coupled to a modulated power supply output and the parallel amplifier has a parallel amplifier output coupled to the modulated power supply output. Further, the parallel amplifier has a group of output stages, such that each output stage is directly coupled to the parallel amplifier output and each output stage receives a separate supply voltage. | 03-06-2014 |
20140077787 | OPEN LOOP RIPPLE CANCELLATION CIRCUIT IN A DC-DC CONVERTER - A direct current (DC)-DC converter, which includes an open loop ripple cancellation circuit, a switching supply, and a parallel amplifier, is disclosed. During a calibration mode, the parallel amplifier provides a parallel amplifier output current to regulate a power supply output voltage based on a calibration setpoint. The switching supply drives the parallel amplifier output current toward zero using a switching control signal, such that during the calibration mode, an estimate of a current gain is based on the switching control signal. Further, during the calibration mode, the open loop ripple cancellation circuit is disabled. During a normal operation mode, the open loop ripple cancellation circuit provides a ripple cancellation current, which is based on the estimate of the current gain. | 03-20-2014 |
20140097895 | PSEUDO-ENVELOPE FOLLOWING FEEDBACK DELAY COMPENSATION - A switch mode power supply converter and a feedback delay compensation circuit are disclosed. The switch mode power supply converter has a switching voltage output and provides a switching voltage at the switching voltage output, such that a target voltage for a power amplifier supply voltage at a power amplifier supply output is based on the switching voltage. Further, the switching voltage is based on an early indication of a change of the target voltage. The feedback delay compensation circuit provides the early indication of the change of the target voltage. | 04-10-2014 |