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| Number | Title | Issue Date |
| 8188791 | Programmable gain amplifier and transconductance compensation system A programmable gain amplifier (PGA) system comprises selectable parallel transconductors in a front end, independently selectable serial amplification circuits in a back end. The back end is configured to receive an output of the front end and may include a pluralit... | 05/29/2012 |
| 8130035 | Post amplifier with selectable gain A selectable gain amplifier includes two or more selectable gain stages, each gain stage having a first input coupled to receive an input signal, a second input, and an output. The amplifier further includes and two or more feedback paths coupled between the outputs... | 03/06/2012 |
| 8125275 | Amplifier having input/output cells with discrete gain steps An amplifier has an input section with one or more input cells and an output section with one or more output cells. Either the input section or the output section includes at least two cells that may be selected to provide discrete gain settings. A loop amplifier is... | 02/28/2012 |
| 8111102 | Auto gain controllers, and communication terminals having the same An auto gain controller is provided. The auto gain controller includes a variable gain amplification unit configured to receive differential input signals, adjust an amplification gain based on an auto gain control voltage and output differential output signals. The... | 02/07/2012 |
| 8106710 | Apparatus and method for variable gain transconductance The present disclosure describes a variable gain transconductor having gain and/or linearity performance that are selectively controllable in operation. In one embodiment the gain and/or linearity performance are selectively controllable in response to the strength ... | 01/31/2012 |
| 8102209 | CMOS variable gain amplifier A complementary metal-oxide semiconductor (CMOS) variable gain amplifier includes: a cascode amplifier including a common source field effect transistor and a common gate field effect transistor in a cascode structure; a first current generation unit connected in pa... | 01/24/2012 |
| 8102208 | Signal amplifier A signal amplifier controls an output amplitude of a differential transmitted from an amplifier circuit to two output terminals via each of 2N number of MOS transistors that operate as a switch by switching a control value n, and includes an amplitude-control-word s... | 01/24/2012 |
| 8098097 | Radio frequency buffer Systems, methods, and devices for receiving a differential input signal and generating a non-differential output signal are described herein. For example, an RF buffer is described that includes first and second transistor elements. The first transistor element rece... | 01/17/2012 |
| 8089315 | Programmable gain amplifier A programmable gain amplifier comprising alternatively selectable parallel circuits in a front end and independently selectable serial amplification circuits in a back end. The front end may include, for example, a plurality of transconductors in parallel and each c... | 01/03/2012 |
| 8085091 | Gain control amplifier Systems, methods, and devices provided herein are directed to improvements in gain control amplifiers that receive an input signal and generate an output signal with a selectively variable gain. A differential amplified gain stage receives an input signal and scales... | 12/27/2011 |
| 8044720 | Amplification circuit An amplification circuit includes a semiconductor amplification element, a current feedback circuit that is connected to a terminal close to a ground side of the semiconductor amplification element and can control gain reduction, and a voltage feedback circuit that ... | 10/25/2011 |
| 7999615 | Current canceling variable gain amplifier and transmitter using same A current canceling CMOS variable gain amplifier includes a first leg and a second leg. The first leg has a first input line, a first output line, a first ON transistor, a first control transistor and a first subtracting transistor. The second leg has a second input... | 08/16/2011 |
| 7990217 | Input system for a variable gain amplifier having class-AB transconductance stages A variable gain amplifier includes an attenuator having a plurality of pairs of tap points, and a plurality of pairs of gm cells, wherein each pair of gm cells is coupled to a corresponding pair of the tap points, and each pair of gm cells is constructed and arrange... | 08/02/2011 |
| 7990218 | Db-linear process-independent variable gain amplifier An amplifier is provided with continuously-variable analog control that exhibits a highly linear gain control curve in db/volts, while preserving high dynamic range, low third order distortion, and low noise. This amplifier has a control mechanism that preserves a v... | 08/02/2011 |
| 7973602 | Variable gain amplifier Various amplifier configurations having increased bandwidth, linearity, dynamic range, and less distortion are shown and disclosed. To increase bandwidth in a transimpedance amplifier, a replica circuit is created to replicate a degeneration resistance, or the resis... | 07/05/2011 |
| 7956688 | Common mode cancellation in differential networks Embodiments of the invention include a common mode cancellation circuit and method for correcting signal skew in a differential circuit. According to one embodiment, an op amp circuit is used to correct the mismatch between transmission line lengths in the different... | 06/07/2011 |
| 7956689 | Programmable gain amplifier and transconductance compensation system A programmable gain amplifier (PGA) system comprises selectable parallel transconductors in a front end, independently selectable serial amplification circuits in a back end. The back end is configured to receive an output of the front end and may include a pluralit... | 06/07/2011 |
| 7956687 | Constant-bandwidth variable gain amplifier The performance of an AGC loop typically depends on several factors, including gain linearity of the VGA and variation in the VGA bandwidth over the range of available gain settings. Although a resistively degenerated VGA provides for excellent gain linearity and im... | 06/07/2011 |
| 7948315 | Low noise binary-coded gain amplifier and method for time-gain compensation in medical ultrasound imaging A low noise variable gain amplifier and method for processing received signals in an ultrasound medical imaging system is disclosed. Unlike solutions known from the prior art, the signals are amplified by a binary-coded gain amplifier having its amplification factor... | 05/24/2011 |
| 7911275 | Constant gain control for multistage amplifiers This disclosure relates to maintaining constant gain within multi-stage amplifiers. ... | 03/22/2011 |
| 7898329 | Common-mode robust high-linearity analog switch A differential gain stage includes a plurality of programmable passive circuit component arrays operable to set a gain of the gain stage. The gain stage also includes an active switch gate control circuit and a passive switch gate control circuit. The active switch ... | 03/01/2011 |
| 7893765 | Current canceling variable gain amplifier and transmitter using same A current canceling CMOS variable gain amplifier includes a first leg and a second leg. The first leg has a first input line, a first output line, a first ON transistor, a first control transistor and a first subtracting transistor. The second leg has a second input... | 02/22/2011 |
| 7889005 | Controllable amplifier and the use thereof A controllable amplifier amplifies a radiofrequency input signal on the basis of a control signal. A current path is formed between a supply potential connection and a reference potential connection. The current path includes an amplifier transistor and a cascode tr... | 02/15/2011 |
| 7889006 | dB-linear process-independent variable gain amplifier An amplifier is provided with continuously-variable analog control that exhibits a highly linear gain control curve in db/volts, while preserving high dynamic range, low third order distortion, and low noise. This amplifier has a control mechanism that preserves a v... | 02/15/2011 |
| 7876154 | Variable gain amplifier having linear-in-dB gain characteristic A variable gain amplifier (VGA) with a linear-in-dB gain characteristic is provided. The VGA includes: a control signal converter which converts an input gain control signal VC, which is input so that the VGA obtains a linear-in-dB gain characteristic to ... | 01/25/2011 |
| 7847635 | Transconductance amplifier Provided is a transconductance amplifier capable of suppressing variation in the range of a linear relationship between an input voltage and an output current depending on the magnitude of a tuning voltage Vctrl, thereby adjusting transconductance over a wider range... | 12/07/2010 |
| 7834692 | Peak detector with active ripple suppression A peak detector circuit that responds rapidly to power transients, and yet is able to avoid interpreting data fluctuations as power transients by generating dual peak signals from an amplifier's differential output signal, where the dual peak signals have data rippl... | 11/16/2010 |
| 7825728 | Variable gain circuit Provided is a variable gain circuit in which it is not necessary to provide a plurality of phase compensation capacities while stability of a circuit is maintained regardless of a set variable gain. A variable gain circuit comprises a precedent stage amplifier circu... | 11/02/2010 |
| 7800446 | Method and system for varying gain exponentially with respect to a control signal A method for varying gain exponentially with respect to a control signal is provided. The method includes receiving a primary control signal. A secondary control signal is generated based on the primary control signal. The secondary control signal is provided to a v... | 09/21/2010 |
| 7795973 | Programmable gain amplifier A programmable gain amplifier comprising alternatively selectable parallel circuits in a front end and independently selectable serial amplification circuits in a back end. The front end may include, for example, a plurality of transconductors in parallel and each c... | 09/14/2010 |
| 7795972 | Automatic gain control apparatus and technique An amplifier includes steering stages to receive a control signal and collectively provide an output signal. Each steering stage receives an associated input signal and contributes to the output signal based on the control signal. The amplifier includes an attenuato... | 09/14/2010 |
| 7795974 | Digitally variable gain amplifier using multiplexed gain blocks A digitally variable gain amplifier comprising a front-end stage, a level shifter stage, and an output amplifier stage. The front-end stage comprises a high gain pre-amplifier and a low gain pre-amplifier driven in parallel by a differential input signal. A coarse g... | 09/14/2010 |
| 7782136 | Digitally adjusted variable gain amplifier (VGA) using switchable differential pairs A variable gain amplifier including a stage. The stage having a set of switchable differential pairs. The stage providing a gain range to a signal and adjusting a gain of the signal. At least one differential pair in each stage is permanently enabled. The variable g... | 08/24/2010 |
| 7760021 | Variable gain amplifier The present invention relates to a variable gain amplifier. The variable gain amplifier in an ultrasound includes an attenuator. The attenuator includes resistor strings each having a plurality of resistors connected in series to each other and a gain control unit. ... | 07/20/2010 |
| 7760020 | Amplifier device An electronic circuit arrangement is provided which comprises an input terminal configured to input an input signal to be amplified and an output terminal configured to output the amplified input signal as an output signal. A signal path is defined between the input... | 07/20/2010 |
| 7755426 | Variable gain amplifier and method for achieving variable gain amplification with high bandwidth and linearity Various example embodiments are disclosed. According to one example embodiment, a high bandwidth, fine granularity variable gain amplifier (“VGA”) may comprise an attenuator, a gain block and a gain adjustment control. The attenuator may comprise at least one pa... | 07/13/2010 |
| 7750736 | Integrated circuit system for controlling amplifier gain An integrated circuit system comprising: forming a differential amplifier including: forming a first transistor, coupling a second transistor to the first transistor in a high gain configuration, and coupling a third transistor, having a low gain configuration, in p... | 07/06/2010 |
| 7746169 | LNA having a post-distortion mode and a high-gain mode A differential low noise amplifier (LNA) is operable in a selectable one of two modes. The LNA includes a first transistor, a second transistor, a third transistor and a fourth transistor. In the first mode (PDC mode), the four transistors are configured to operate ... | 06/29/2010 |
| 7741909 | Linear-in-dB variable gain amplifier A variable gain amplifier (VGA) with a gain thereof exponential to a control voltage thereof. The variable gain amplifier (VGA) comprises an exponential DC converter, and a linear voltage multiplier. The exponential DC converter receives the control voltage and gene... | 06/22/2010 |
| 7728668 | Variable-gain amplification circuit, receiver and receiver IC Disclosed herein is a variable-gain amplification circuit, wherein the sources of first and second MOSFETs (Metal Oxide Semiconductor Field Effect Transistors) are tied to a common connection point connected to a current source. An input signal is supplied to the ga... | 06/01/2010 |
