Class / Patent application number | Description | Number of patent applications / Date published |
327359000 | Differential amplifier | 21 |
20080284489 | TRANSCONDUCTOR AND MIXER WITH HIGH LINEARITY - A transconductor. The transconductor comprises first and second active device networks. The first active device network has a first node and a second node and comprises a first MOS transistor having a gate, a source coupled to the first node, and a drain coupled to the second node. The second active device network has a first node and a second node respectively connected to the first and second nodes of the first active device network and comprises a second MOS transistor and a voltage drop generator. The second MOS transistor has a gate and a source respectively connected to the gate and the source of the first MOS transistor. The voltage drop generator is coupled between a drain of the second MOS transistor and the second nodes of the first and second active device networks and generates a voltage drop across the same. | 11-20-2008 |
20090134932 | LOW FLICKER NOISE MIXER AND BUFFER - Low flicker noise mixer and buffer. This design employs some native metal oxide semiconductor field-effect transistors (MOSFETs) (e.g., having no threshold voltage) within a passive mixer whose gates are driven using clock signals. These native MOSFETs maybe biased at one half of the power supply voltage to provide a lower noise figure. A cooperatively operating buffer employs appropriately places MOSFETs and resistors to ensure the desired gain. Relatively larger valued resistors can be employed to provide for higher voltage gain, and this can sometimes be accompanied with using a higher than typical power supply voltage. Source followers serve as output buffers and also ensure the required output DC voltage level as well. It is also noted that this design can be implemented using n-channel metal oxide semiconductor field-effect transistors (N-MOSFETs) of p-channel metal oxide semiconductor field-effect transistors (P-MOSFETs). | 05-28-2009 |
20090295454 | LOW VOLTAGE MIXER CIRCUIT - A mixer circuit ( | 12-03-2009 |
20100188132 | METHOD FOR PROVIDING A VERY LOW REFERENCE CURRENT - A system that includes: multiple transistors that comprise a first transistor that is maintained in a weak inversion state; wherein sources of the multiple transistors are coupled to a low current source; wherein drains of the multiple transistors are coupled to a voltage supply source; a first amplifier that has a positive input, negative input and an output; wherein the positive input receives an input voltage; wherein the negative input is coupled to a source of the first transistor; wherein the output is coupled to a gate of the first transistor and to a multiplication and subtracting circuit; a multiplication and subtraction circuit that is coupled to the first amplifier and outputs an output signal that equals a difference between the input voltage and a product of a current reduction variable and a voltage reduction signal; wherein the voltage reduction signal is associated with a current reduction factor; wherein the output signal is provided to a second transistor that is maintained in weak inversion; and wherein the second transistor outputs, in response to a reception of the output signal, a current that is responsive to the pixel output signal, is proportional to the low current and is inversely proportional to the current reduction variable and the current reduction factor. | 07-29-2010 |
20100219875 | Mixer Capable of Improving Signal Quality - A mixer includes a transduction circuit, a first and a second switch circuit, and a first and a second load circuit. The transconductor circuit is for generating a differential current signal according to a differential voltage signal. The first switch circuit and the first load circuit are connected in series, and the first switch circuit is used to regulate the differential current signal in response to a first oscillator signal. The second switch circuit and a second load circuit are connected in series, and the second switch circuit is used to regulate the differential current signal in response to a second oscillator signal. The first load circuit and the second load circuit are connected at a common node to reduce harmonic interferences. | 09-02-2010 |
20100264979 | MIXER CIRCUIT - In a mixer circuit, addition of analog signals by capacitive coupling is used and square-law characteristics of the drain current of a MOS transistor operating in a saturated region are used. With this configuration, the voltage and power of the mixer circuit can be reduced. | 10-21-2010 |
20100301920 | MIXER WITH HIGH LINEARITY - A mixer is provided. The transconductance stage receives an input signal through an input node and outputs an output signal through an output node. The transconductance stage includes a first transistor coupled between the output node and a first power node, having a first gate coupled to the input node, and operating in a saturation region, a second transistor coupled to the first power node, having a second gate coupled to the input node, and operating in a sub-threshold region, a first biasing circuit providing a first bias voltage, and a third transistor coupled between the output node and the second transistor, and having a third gate coupled to the first bias voltage. The switching quad is coupled to the output node and generates a translation current according to the output signal. The transimpedance amplifier transforms the translation current to a corresponding voltage. | 12-02-2010 |
20100321086 | POWER AND IMPEDANCE MEASUREMENT CIRCUITS FOR A WIRELESS COMMUNICATION DEVICE - Exemplary embodiments disclosed are directed to power and impedance measurement circuits that may be used to measure power and/or impedance are described. A measurement circuit may include a sensor and a computation unit. The sensor may sense (i) a first voltage signal across a series circuit coupled to a load to obtain a first sensed signal and (ii) a second voltage signal at a designated end of the series circuit to obtain a second sensed signal. The sensor may mix (i) a first version of the first sensed signal with a first version of the second sensed signal to obtain a first sensor output and (ii) a second version of the first sensed signal with a second version of the second sensed signal to obtain a second sensor output. The computation unit may determine the impedance and/or delivered power at the designated end of the series circuit based on the sensor outputs. | 12-23-2010 |
20100327941 | Transimpedance Amplifier Input Stage Mixer - A Gilbert cell mixer design is disclosed. Instead of using a differential transconductance stage as typically done, the design employs a differential transimpedance amplifier input stage. By utilizing a transimpedance input stage to the Gilbert mixer, feedback is used to obtain higher linearity without sacrificing noise performance. The transimpedance input stage supplies a current signal to the cascode connected Gilbert switching quad, so the transimpedance amplifier output is taken from the collector of the transimpedance amplifier output transistor, instead of the emitter as normally done with transimpedance amplifiers. | 12-30-2010 |
20110037510 | MIXER CIRCUIT - In a mixer circuit, addition of analog signals by capacitive coupling is used and square-law characteristics of the drain current of a MOS transistor operating in a saturated region are used. With this configuration, the voltage and power of the mixer circuit can be reduced. | 02-17-2011 |
20120098585 | QUADRATURE MIXER - This invention provides an quadrature mixer which does not require a long time to adjust the amplitude value at the time of demodulation of the IQ signal. The quadrature mixer, comprising a first frequency-conversion unit that outputs a sixth signal derived by multiplying a first signal by a second and a fourth signals, a second frequency-conversion unit that outputs a seventh signal derived by multiplying the first signal by a third and a fifth signals, a first amplitude adjustment unit that outputs a eighth signal derived by multiplying the sixth signal by the third and fifth signals and a second amplitude adjustment unit that outputs a ninth signal derived by multiplying the seventh signal by the second and fifth signals. | 04-26-2012 |
20120133418 | GILBERT MIXER - A Gilbert mixer ( | 05-31-2012 |
20120200334 | Low Noise Mixer - An apparatus comprising a low noise mixer comprising a transconductance amplifier configured to receive a differential voltage and to generate a differential current signal, a passive mixer directly connected to an output of the transconductance amplifier, and a transimpedance amplifier coupled to the passive mixer, wherein the transimpedance amplifier is configured to receive a current signal and convert the current signal to a voltage signal. | 08-09-2012 |
20120326763 | SYSTEM AND METHOD FOR PROVIDING A CARBON NANOTUBE MIXER - An embodiment of a system and method provides a carbon nanotube transistor (CNT) mixer with a low local oscillator power requirement and no inter-modulation products. Specifically, an embodiment of the system and method provides two kinds of device current-voltage (I-V) characteristics on the same integrated circuit: exponential and linear. The CNT I-V characteristics support both the ideal exponential control characteristic (determined by physics constants) and the ideal linear control characteristic (also determined by physics constants), resulting in an ideal multiplier. In other words, the CNT mixer is mathematically equivalent to an ideal multiplier. Such an ideal multiplier can be used as a mixer with low local oscillator power requirement and virtually no inter-modulation products. | 12-27-2012 |
20130099848 | CONTROL APPARATUS WITH DIFFERENTIAL CONTROL IN A MAGNETICALLY COUPLED COIL SYSTEM FOR A CURRENT-REGULATED AMPLIFIER POWERING FIELD COILS OF A MAGNETIC RESONANCE TOMOGRAPH - A control apparatus for a gradient amplifier includes a differentiation unit. The differentiation unit forms a differentiation signal by differential processing from a current desired value signal of the gradient amplifier. At least one electrical low pass filter unit is connected in series with the differentiation unit, and/or at least one electrical high pass filter unit is connected in parallel with the differentiation unit. | 04-25-2013 |
20140028373 | TRANSMISSION DEVICE AND SENSOR SYSTEM - A transmission device for two electric pulse measurement signals includes a first measurement signal input, a second measurement signal input, a differential measurement signal output and a signal converter. The first measurement signal input serves for receiving a first single-ended measurement signal, the second measurement signal input for receiving a second single-ended measurement signal, wherein the signal converter is implemented, when receiving a first one of the single-ended measurement signals, to convert either the first single-ended measurement signal or the second single-ended measurement signal into a combined differential measurement signal and provide the same at the differential measurement signal output. Here, the differential measurement signal includes a first differential portion which may be allocated to the first single-ended measurement signal and a second differential portion which may be allocated to the second single-ended measurement signal. | 01-30-2014 |
20140184301 | LINEARITY IMPROVEMENT OVER TEMPERATURE USING TEMPERATURE DEPENDENT COMMON-MODE VOLTAGES IN ACTIVE MIXER - A mixer comprising a Gilbert cell configured to receive a baseband signal and a local oscillator signal, wherein the Gilbert cell comprises a baseband transistor and a local oscillator transistor, and a biasing circuit configured to generate a bias voltage that is inversely related to temperature and coupled to the local oscillator transistor. | 07-03-2014 |
20140197874 | BALANCED FREQUENCY MIXER CIRCUIT - A frequency mixer circuit includes a mixer, a load stage, and again stage. The load stage cooperates with the mixer to generate a differential output voltage signal with a mixed frequency according to a differential local oscillator voltage signal and a differential input voltage signal. The gain stage has a transconductance, and a magnitude of the differential current signal and the transconductance have a positive relationship therebetween, so as to result in a positive relationship between the transconductance and a conversion gain which is a ratio of magnitude of the differential output voltage signal to magnitude of the differential input voltage signal. | 07-17-2014 |
20140312955 | BALUN MIXER CIRCUITS - A single-balanced balun mixer circuit includes a balun with a center tap connected to a differential pair with a tail resistor. The balun receives a first input signal and a second signal at the single-ended input terminal and the center tap, respectively. Such a balun mixer may be used as an up-converter mixer by supplying a baseband or intermediate signal at the center tap and a local oscillator (LO) signal at the single-ended input terminal. | 10-23-2014 |
20150137869 | MIXING CIRCUIT - A balun converts a single-ended radio-frequency signal into differential signals. A differential matching circuit outputs a maximum-level positive-phase output signal at a lower or higher frequency than the center frequency and outputs a maximum-level reverse-phase output signal at a higher or lower frequency than the center frequency. An amplification circuit amplifies a positive-phase output signal and a reverse-phase output signal of the differential matching circuit. A mixing circuit converts the positive-phase output signal and the reverse-phase output signal that are output from the amplification circuit into intermediate-frequency signals using locally generated signals. | 05-21-2015 |
20190149092 | DIFFERENTIAL MIXER AND METHOD | 05-16-2019 |