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| Number | Title | Issue Date |
| 8179195 | Current-feedback instrumentation amplifiers Current-feedback instrumentation amplifiers that include dynamic element matching for the input transconductance amplifiers by periodically swapping the transconductance amplifiers between the instrumentation amplifier input and the feedback input. The instrumentati... | 05/15/2012 |
| 8154337 | Apparatus and method for automated offset reduction in matched differential input devices An amplifier includes an input stage, a comparator coupled to an output of the differential input stage, and a trimming controller coupled to an output of the comparator. The input stage includes a plurality of trim devices coupled in parallel with a first input dev... | 04/10/2012 |
| 8154338 | Offset cancellation for differential circuits An offset cancellation circuit for canceling an offset voltage in an amplifier is provided herein. The offset cancellation circuit includes a current source configured to provide an offset current, a switching stage comprising first and second switches, and a cascod... | 04/10/2012 |
| 8138826 | Apparatus and method for complete elimination of input coupling capacitors in signal amplification A circuit and method for signal amplification is provided. The circuit includes an amplifier including an input amplifier that is arranged to receive an input analog signal, and to provide an input amplifier output signal by amplifying the input analog signal. The a... | 03/20/2012 |
| 8120423 | OP-AMP sharing with input and output reset An operational amplifier with two pairs of differential inputs for use with an input switch capacitor network. The operational amplifier has reset devices for resetting the second pair of differential inputs while amplifying the first pair of differential inputs, an... | 02/21/2012 |
| 8120422 | Ripple reduction loop for chopper amplifiers and chopper-stabilized amplifiers Ripple reduction loop for chopper amplifiers and chopper-stabilized amplifiers. The ripple reduction loop includes a first chopper, a first amplifier having an input coupled to an output of the first chopper, a second chopper having an input coupled to an output of ... | 02/21/2012 |
| 8115539 | Operational amplifier Provided is an operational amplifier capable of correcting an offset voltage of an element to be connected to an input terminal. The operational amplifier includes a main amplifier and an offset correction amplifier, which include input terminals connected in common... | 02/14/2012 |
| 8111098 | Segmented linear FM power amplifier Various apparatuses and methods for amplifying an FM signal in a segmented linear power amplifier are disclosed herein. For example, some embodiments provide an apparatus including a signal input, a signal output, and an output driver connected between the signal in... | 02/07/2012 |
| 8111097 | Device with reconfigurable continuous and discrete time functionality A programmable system includes a programmable analog device including an operational amplifier to generate an output voltage based on input voltages at terminals of the operational amplifier. The programmable system also includes a system controller to direct the pr... | 02/07/2012 |
| 8102203 | Offset cancellation in a capacitively coupled amplifier A method for calibrating an offset voltage of an amplifier used to amplify capacitively coupled communication signals is described. During this process, a common voltage is applied to one or more inputs to the amplifier. Next, an output of the amplifier is iterative... | 01/24/2012 |
| 8102204 | Amplifiers with input offset trim and methods Amplifiers with power-on trim and methods using an amplifier system having an amplifier system input and an amplifier system output, an amplifier, a comparator, a successive approximation register having an input coupled to an output of the comparator, a first switc... | 01/24/2012 |
| 8072261 | Power amplifier A power amplifier based on EER technology or ET technology extracts an amplitude-modulated component from a modulated signal as an input signal which includes the amplitude-modulated component and a phase-modulated component, and decomposes the amplitude-modulated c... | 12/06/2011 |
| 8072262 | Low input bias current chopping switch circuit and method A chopper-stabilized circuit (1) includes pre-chopping circuitry (26) for chopping an input signal (Vin) at a first frequency to generate a first signal. Input chopping circuitry (9) chops the first signal at a second frequency substantially gre... | 12/06/2011 |
| 8026760 | Gain enhanced switched capacitor circuit and method of operation A switched capacitor circuit utilizes a pair of serially connected differential amplifiers that have plus inputs, minus inputs, plus outputs, and minus outputs. Feedback to the plus/minus inputs is in a first configuration relative to the output of the pair of diffe... | 09/27/2011 |
| 8026759 | Multistage amplifying circuit A multistage amplifying circuit includes a first amplifying circuit that either samples a first analog voltage input or amplifies a difference between the first analog voltage and a first digital voltage converted from the first analog voltage, in response to a cont... | 09/27/2011 |
| 8026761 | Instrumentation amplifier calibration method, system and apparatus Calibration of gain and/or offset of an instrumentation amplifier (INA) is accomplished by coupling an appropriate number of current sources, and/or current sinks, respectively, to first and/or second transconductance stage(s) of the INA. Gain and/or offset calibrat... | 09/27/2011 |
| 8018274 | Switched capacitor amplifier circuit with clamping A system comprises a switched capacitor amplifier including an operational amplifier (opamp). A switching circuit comprises a first switch connected across inputs of the opamp. A second switch is connected across outputs of the opamp. An overdrive detect circuit com... | 09/13/2011 |
| 8013671 | Semiconductor integrated circuit A semiconductor integrated circuit includes a first input terminal configured to input a first input voltage, a second input terminal configured to input a second input voltage, a differential amplifier configured to generate a differential output voltage by amplify... | 09/06/2011 |
| 8008968 | Multipath amplifier Because of variations in open loop gain and bandwidth in successive approximate register (SAR) analog-to-digital converters (ADCs), designing amplifiers with the desired characteristics is difficult. Here, a multipath amplifier is provided that accounts for the vari... | 08/30/2011 |
| 8004353 | Circuit A circuit and an adjusting method with a differential amplifier and with a control circuit, wherein the differential amplifier has a first amplifier transistor which for amplifying an input signal of the differential amplifier is connected in a first branch of the d... | 08/23/2011 |
| 7973596 | Low-noise, low-power, low drift offset correction in operational and instrumentation amplifiers Low-noise, low-power, low drift offset correction in operational and instrumentation amplifiers and amplifiers using the same are disclosed. The amplifiers disclosed use different combinations of chopping and auto-zero techniques. Also disclosed are amplifiers using... | 07/05/2011 |
| 7961042 | Amplifier circuit and magnetic sensor An amplifier circuit, includes: a first amplifier; a second amplifier; a first capacitor connected to the first amplifier; a second capacitor having one terminal connected to the first amplifier, another terminal connected to the second input terminal; and a first s... | 06/14/2011 |
| 7961041 | System and method for generating a reference voltage In one embodiment, a circuit having a chopper stabilized amplifier and a network coupled in feedback with the chopper stabilized amplifier is disclosed. The circuit also has a plurality of switches coupled to an output of the chopper stabilized amplifier, and a summ... | 06/14/2011 |
| 7956679 | Differential amplifier with offset voltage trimming A differential amplifier that has a current supply and a differential current to voltage converter with a positive current input node, a negative current input node and a voltage output node, has offset voltage trimming. The voltage output node provides an output vo... | 06/07/2011 |
| 7956680 | Low-noise DC offset calibration circuit and related receiver stage A DC offset calibration circuit has a first resistor, a first switch, a second resistor, and a second switch. The first resistor is coupled to a first supply voltage. The first switch is coupled to the first resistor, to a first input of an amplifier, and to a first... | 06/07/2011 |
| 7944288 | Switched-capacitor amplifier arrangement having a low input current An SC amplifier arrangement and a method for measuring an input voltage are described. ... | 05/17/2011 |
| 7944287 | Low-noise, wide offset range, programmable input offset amplifier front end and method A programmable offset amplifier includes first (M1) and second (M2) input transistors having differentially connected sources and gates coupled to first (Vin+) and second (Vin−) input voltages. A tail current (Itail1)... | 05/17/2011 |
| 7924088 | Offset voltage calibration method and apparatus and amplifier thereof An offset voltage calibration method is disclosed, which is utilized for calibrating an offset voltage of an electronic device during a calibration period. The offset voltage calibration method includes generating a control signal according to an output signal of th... | 04/12/2011 |
| 7920022 | Switched capacitor system with and method for output glitch reduction A switched capacitor system with output glitch reduction step charges the switched capacitor by switching it to a first voltage level in a first phase, to an intermediate voltage level of a pre-charge node in a pre-charge phase and to the voltage level of the output... | 04/05/2011 |
| 7907007 | Commutating auto zero amplifier A commutating auto zero amplifier system, comprises a first amplifier (A1), a second amplifier (A2) and a switching arrangement which defines a two phase operation, with one amplifier in an output mode providing the output and the other amplifier in a ... | 03/15/2011 |
| 7898323 | Amplifying circuit with offset compensation An amplifying circuit has an offset calibration mode and a normal mode. The amplifying circuit includes an amplifier having a non-inverting input and an inverting input for receiving, during the normal mode, a first input signal and a second input signal and an outp... | 03/01/2011 |
| 7888996 | Chopper stabilized operational amplifier Chopper stabilized operational amplifiers are in common use. One drawback of these amplifiers, however, is that there is an inherent tone present at the chopper frequency. Conventional circuits have attempted to reduce the effects of this tone by using various filte... | 02/15/2011 |
| 7888995 | Differential amplifier circuit having offset adjustment circuit A differential amplifier circuit includes an offset adjuster circuit for varying the active load to adjust the offset caused by the differential pair. The differential amplifier circuit includes fine adjustment cell sections including a plurality of transistors havi... | 02/15/2011 |
| 7880537 | Operational amplifier, line driver, and liquid crystal display device An operational amplifier capable of offset cancel in a shorter period, as well as a line driver capable of shortening one horizontal period and a liquid crystal display device are provided. In the operational amplifier of the invention, a time necessary for feed bac... | 02/01/2011 |
| 7880538 | Switched-capacitor amplifier arrangement and method A switched-capacitor amplifier arrangement and a method to amplify a signal are presented. A forward path has at least one switched capacitor (10) controlled by a clock signal, thus providing an amplification phase (1) of the forward path and an additi... | 02/01/2011 |
| 7868691 | Commutating amplifier with wide dynamic range Variable gain commutating amplifier apparatus and methods for use in a polar modulator are described. The apparatus may include two or more commutating amplifier stages configured to be switched to an output load based on a desired amplitude and/or transmit power le... | 01/11/2011 |
| 7847629 | Sample-and-hold amplifiers A sample-and-hold amplifier is provided. The sample-and-hold amplifier comprises a sample-and-hold circuit and a buffer circuit. The sample-and-hold circuit receives an input signal and transmits the input signal to a first node according to a control signal. The bu... | 12/07/2010 |
| 7847628 | Chopper-stabilized instrumentation amplifier This disclosure describes a chopper stabilized instrumentation amplifier. The amplifier is configured to achieve stable measurements at low frequency with very low power consumption. The instrumentation amplifier uses a differential architecture and a mixer amplifie... | 12/07/2010 |
| 7834685 | Chopped auto-zeroed ping-pong amplifier and related apparatus, system, and method An apparatus includes a plurality of amplifier stages configured to receive an input voltage and generate an amplified output current. Each amplifier stage includes a transconductance stage configured to receive the input voltage and generate a first intermediate ou... | 11/16/2010 |
| 7821333 | High-voltage differential amplifier and method using low voltage amplifier and dynamic voltage selection A differential amplifier (1D) includes circuitry (5,R1,R2,52) coupling a common mode component of an input voltage (Vin+−Vin−) to a maximum voltage selector circuit (53) that produces an internal voltage (... | 10/26/2010 |
