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| Number | Title | Issue Date |
| 8183920 | Variable gain amplifier with reduced power consumption A variable gain amplifier includes a first common mode (CM) node configured to receive a first differential signal of a pair of differential signals. A first regulator couples to the first CM node, the first regulator being configured to generate a first CM offset. ... | 05/22/2012 |
| 8138833 | Common-mode feedback amplifier A circuit is provided for use with a reference voltage. The circuit includes a voltage source, a common-mode feedback amplifier and a feedback impedance portion. The common-mode feedback amplifier may be connected to the voltage source and may be arranged to receive... | 03/20/2012 |
| 8120425 | System and method for common mode translation System and method for common mode translation in continuous-time sigma-delta analog-to-digital converters. An embodiment includes a loop filter having an RC network coupled to a differential signal input, a Gm-C/Quantizer/DAC circuit (GQD) coupled to the loop filter... | 02/21/2012 |
| 8089316 | Wideband active circuit with feedback structure A broadband active circuit with a feedback structure includes: an active load unit providing a load varied according to a control voltage; an active circuit unit connected between the active load unit and a ground and outputting a signal corresponding to a pre-set b... | 01/03/2012 |
| 8076973 | Fully differential amplifier with continuous-time offset reduction A fully differential amplifier circuit according to one embodiment includes a first section for generating first and second output signals on first and second outputs from first and second input signals; a first feedback loop coupled to the first section, the first ... | 12/13/2011 |
| 8054133 | Device and method for eliminating feedback common mode signals A device and a method for eliminating feedback common mode signals are provided, which belong to the electronic technology field. The device includes an operational amplifier circuit with two output ends. The two output ends are a first output end and a second outpu... | 11/08/2011 |
| 8049562 | Amplifier with improved input resistance and controlled common mode An amplifier includes a first pair of transistors (the first pair) that defines a first output, each transistor of the first pair having a gate coupled to a first input terminal; a second pair of transistors (the second pair) that defines a second output, each trans... | 11/01/2011 |
| 7990219 | Output compensated voltage regulator, an IC including the same and a method of providing a regulated voltage A voltage regulator, a method of regulating voltage and an IC including a voltage regulator. In one embodiment, the voltage regulator includes: (1) a DC precision amplifier configured to generate a DC precision signal based on a reference voltage and a regulated out... | 08/02/2011 |
| 7924095 | Operational amplifiers having low-power unconditionally-stable common-mode feedback An operational amplifier is provided. The operational amplifier includes a first transistor configured to receive a first input voltage, a second transistor configured to receive a second input voltage, and a current steering module coupled to first and second trans... | 04/12/2011 |
| 7924094 | Amplifier and offset regulating circuit An amplifier includes a signal amplification part that outputs an output signal obtained by amplifying an input signal and a common mode voltage VCM of the output signal, and a common mode feedback part that outputs a signal according to a difference betw... | 04/12/2011 |
| 7898331 | Increasing the common mode range of a circuit Increasing the input common-mode range of a circuit which accepts differential signals as inputs. Such an increase may be attained by correcting an input signal at continuous levels or at 2 or more discrete levels) without changing the strength represented by the in... | 03/01/2011 |
| 7893766 | Adaptive common mode bias for differential amplifier input circuits A method and apparatus for extending the common mode range of a differential amplifier. A circuit has a common mode detection circuit, a common mode voltage inversion circuit, and a differential amplifier. The common mode detection circuit receives a differential si... | 02/22/2011 |
| 7884672 | Operational amplifier and method for amplifying a signal with shared compensation components An operational amplifier and a method for amplifying a signal. Embodiments provide a convenient and effective mechanism for reducing die area, design time and design verification time by sharing compensation components between the common-mode and differential feedba... | 02/08/2011 |
| 7852157 | Differential amplifier A differential amplifier includes a differential amplifier section to generate a current composed of a differential-mode current and a first common-mode current according to a differential-mode component and a common-mode component of an input signal, a common-mode ... | 12/14/2010 |
| 7834697 | Differential low frequency noise suppression technique for a common mode feedback circuit Disclosed is a common mode feedback circuit for a differential amplifier that eliminates the effects of low frequency noise. A modulator is placed in a common mode feedback loop that modulates the feedback loop signal at a predetermined frequency to up-convert the l... | 11/16/2010 |
| 7834696 | Common mode control circuitry for multi-stage operational amplifiers This disclosure relates to a common mode regulation in multi stage differential amplifiers. ... | 11/16/2010 |
| 7760023 | Method and apparatus for stabilizing RF power amplifiers A method and apparatus is provided for use in power amplifiers for reducing the peak voltage that transistors are subjected to. A power amplifier is provided with first and second switching devices and an inductor connected between the switching devices. The switchi... | 07/20/2010 |
| 7746170 | Class AB amplifier and imagers and systems using same A class AB amplifier includes an input stage having a pair of differential input terminals, first and second differential output terminals, and a local common mode feedback circuit. The input stage includes a local common mode feedback circuit having cascode transis... | 06/29/2010 |
| 7733179 | Combination trim and CMFB circuit and method for differential amplifiers A differential amplifier (10-1,2) includes an input stage (7) including first (M1) and second (M2) input transistors and first (4A) and second (4B) load devices. Sources of the first and second input transistors are c... | 06/08/2010 |
| 7714656 | Operational amplifier An operational amplifier including an input amplifier configured to amplify at least one differential input signal, a first common mode feedback amplifier configured to amplify a first common mode voltage, a cascode amplifier configured to cascode-amplify output sig... | 05/11/2010 |
| 7710199 | Method and apparatus for stabilizing RF power amplifiers A method and apparatus is provided for use in power amplifiers for reducing the peak voltage that transistors are subjected to. A power amplifier is provided with first and second switching devices and an inductor connected between the switching devices. The switchi... | 05/04/2010 |
| 7696824 | Differential audio amplifier A differential audio amplification apparatus with common mode rejection is shown, having a first input current path (401) and a second input current path (402) with a shunting input resistance (400) therebetween. The apparatus also has a first o... | 04/13/2010 |
| 7692489 | Differential two-stage miller compensated amplifier system with capacitive level shifting A differential two-stage Miller compensated amplifier system with capacitive level shifting includes a first stage differential transconductance amplifier including first and second output nodes and an output common mode voltage, a second stage differential transcon... | 04/06/2010 |
| 7683716 | Constant output common mode voltage of a pre-amplifier circuit A method, apparatus and system of constant output common mode voltage of a pre-amplifier circuit are disclosed. In one embodiment, a system includes a first circuit, a comparator circuit coupled with an output of the first circuit, a pre-amplifier circuit of the com... | 03/23/2010 |
| 7679444 | Differential amplifier system One embodiment of the invention includes a differential amplifier circuit. A first input stage generates first and second control voltages in response to a differential input signal. A second input stage generates third and fourth control voltages in response to the... | 03/16/2010 |
| 7679443 | System and method for common mode translation System and method for common mode translation in continuous-time sigma-delta analog-to-digital converters. An embodiment includes a loop filter having an RC network coupled to a differential signal input, a Gm-C/Quantizer/DAC circuit (GQD) coupled to the loop filter... | 03/16/2010 |
| 7671677 | Current sense amplifier with extended common mode voltage range A circuit includes an input stage configured to receive and amplify an input signal to produce an amplified signal, where the input signal is referenced to a higher voltage and is associated with a common mode voltage. The circuit also includes level shifter resisto... | 03/02/2010 |
| 7671676 | Continuous time common-mode feedback module and method with wide swing and good linearity A continuous time common mode feedback module is capable of operating in a wide range of input voltages. The common mode feedback module includes a common mode detector and an amplifier for computing and amplifying the difference of a reference voltage and a common ... | 03/02/2010 |
| 7656231 | High bandwidth apparatus and method for generating differential signals An apparatus and method for generating differential signals. The apparatus includes a first operational amplifier receiving a first signal, a second operational amplifier receiving a second signal, and a first transistor. The first transistor includes a first gate, ... | 02/02/2010 |
| 7652535 | Continuous time common mode feedback circuit, system, and method Embodiments of the present invention provide a low voltage continuous time common mode feedback (CMFB) module, for low voltage operational amplifiers, providing good linearity, wide bandwidth and low systematic offset. The common mode feedback module includes a cont... | 01/26/2010 |
| 7642852 | Resistor self-trim circuit for increased performance In a method and apparatus for trimming values of load resistors to reduce variations there between, a common mode feedback loop (CMFBL) included in a differential amplifier is switched from operating in a closed loop mode to operate in an open loop mode. The CMFBL i... | 01/05/2010 |
| 7636015 | Differential amplifier and sampling and holding circuit Disclosed is a differential amplifier including: first and second transistors each having a first gate, a second gate, a source, and a drain open to a drain side, the first gate and the second gate being controlled independently, a differential input being supplied ... | 12/22/2009 |
| 7633343 | Fully differential amplifier A fully differential amplifier includes: an N-stage amplifier including first to Nth amplifier stages, where N is a positive integer greater than or equal to 2, the first to Nth amplifier stages being cascaded in sequence so as to generate a pair of differential out... | 12/15/2009 |
| 7629848 | Operational amplifier with extended common-mode input range An operational amplifier is provided with an extended common mode input range. This operational amplifier includes an input stage, a common mode feedback circuit, a current mirror, a replica input stage, and an output stage. The input stage couples to the CMFB circu... | 12/08/2009 |
| 7619475 | Cancellation of common mode oscillation in RF circuits A multistage RF amplifier amplifies RF signals used for communication in a WLAN communications system. The multistage RF amplifier comprises a first amplifier circuit coupled to a second amplifier circuit to maximize amplification. A common mode of the first amplifi... | 11/17/2009 |
| 7605656 | Operational amplifier with rail-to-rail common-mode input and output range An operational amplifier with a rail-to-rail common-mode input and output range comprises a differential input stage consisting of a first differential pair and a second differential pair for receiving an input signal; a summing circuit coupled to the differential i... | 10/20/2009 |
| 7595691 | Pre-amplifier for a receiver and a method therefor A pre-amplifier for a receiver including first and second input operational amplifiers; an output module; and first and second feedforward circuits are provided. The input operational amplifiers amplify an input differential voltage pair to output a first and a seco... | 09/29/2009 |
| 7592871 | Fully differential current-feedback CMOS/bipolar operational amplifier A differential current amplifier circuit includes a first circuit generating a first pair of output currents based on a first input current to the differential current amplifier circuit. A second circuit generates a second pair of output currents based on a second i... | 09/22/2009 |
| 7592870 | Low noise, low power, high linearity differential amplifier with a capacitive input impedance A low noise, low power differential two-stage amplifier includes a first stage comprising a pair of electrical devices that sense an input signal difference across the pair of electrical devices; and a control feedback loop operatively connected to the first stage, ... | 09/22/2009 |
| 7589591 | Differential sensing with high common mode rejection A differential operation circuit that uses the differential input signals to generate a reference voltage that fluctuates with the common mode voltage of the differential input signals. The reference voltage includes a common mode component that generally follows th... | 09/15/2009 |
