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| Number | Title | Issue Date |
| 8169262 | Method for reducing offset voltage of operational amplifier and the circuit using the same The invention provides an operational amplifier. In one embodiment, the operational amplifier includes an input stage circuit, a feedback circuit, a fixed stage circuit, and an output stage circuit. The input stage circuit receives a positive input voltage and a neg... | 05/01/2012 |
| 8149054 | Operational amplifier An operational amplifier includes a differential amplifier input stage that supplies an operating current to a differential pair, the differential amplifier input stage including a first transistor having a first polarity, a push-pull amplifier output stage that inc... | 04/03/2012 |
| 8143948 | High bandwidth, rail-to-rail differential amplifier with input stage transconductance amplifier An error amplifier expected to exhibit rail-to-rail operation, high bandwidth, and high slew rate, is described, the error amplifier comprising a first stage to receive an input differential voltage and to provide transconductance gain, an intermediate stage to prov... | 03/27/2012 |
| 8111103 | Amplifier circuit with overshoot suppression An amplifier circuit with overshoot suppress scheme including an input amplifier, an output amplifier, and a diode is provided. A first and a second input ends of the output amplifier are coupled to a differential output pair of the input amplifier. A first end of t... | 02/07/2012 |
| 8035448 | Differential amplifier that compensates for process variations A fully differential amplifier includes an input stage and an output stage. The input stage has two differential pairs of n-type input transistors, and two differential pairs of p-type input transistors. The output stage has a first p-type output transistor and a se... | 10/11/2011 |
| 7999616 | Method for reducing offset voltage of operational amplifier and the circuit using the same The invention provides an operational amplifier. In one embodiment, the operational amplifier includes an input stage circuit, a feedback circuit, a fixed stage circuit, and an output stage circuit. The input stage circuit receives a positive input voltage and a neg... | 08/16/2011 |
| 7994859 | High-speed, multi-stage class AB amplifiers A multi-stage Class AB amplifier system includes a first Class AB amplifier circuit and a second Class AB amplifier circuit. A current mirror circuit is in communication with the first Class AB amplifier circuit. A bias circuit is in communication with the current m... | 08/09/2011 |
| 7978010 | Boost operational amplifier A boost operational amplifier. A boot operational amplifier may include a differential amplifying unit amplifying and/or outputting an inputted differential voltage, a first mirroring unit mirroring a current flowing through a first output terminal of a differential... | 07/12/2011 |
| 7956690 | Operational amplification circuit An operational amplification circuit includes a differential amplification circuit portion that amplifies a differential input, and an output circuit portion that outputs the amplified output using a signal amplified in the differential amplification circuit portion... | 06/07/2011 |
| 7924093 | Amplifier arrangement and method for signal amplification An amplifier arrangement comprises a signal input (Iin+, Iin−) to receive a signal to be amplified, a signal output (Out) to provide an amplified signal, an amplifier stage (AS) coupled between the signal input (Iin+, Iin−) and the signal output (Out), a switcha... | 04/12/2011 |
| 7920025 | Operational amplifier and method of driving liquid crystal display It was difficult to design an operational amplifier which can cancel an offset to drive a liquid crystal display. An operational amplifier includes: a first differential pair having a first transistor and a second transistor of a first conduction type; a second diff... | 04/05/2011 |
| 7920026 | Amplifier output stage with extended operating range and reduced quiescent current An output stage of an amplifier circuit includes one or more output transistors that are selectively driven by a boosted drive circuit, where the boosted drive circuit is arranged such that the output range of the amplifier circuit is increased while maintaining red... | 04/05/2011 |
| 7907011 | Folded cascode operational amplifier having improved phase margin A folded cascode operational amplifier having an improved phase margin due to pole-zero cancellation by using a plurality of cascode-connected bias circuits and frequency compensation capacitors. ... | 03/15/2011 |
| 7898330 | Class AB amplifier systems The present invention comprises class AB amplifier systems exhibiting low quiescent power, low-voltage operation, high gain, high bandwidth, low noise and low offset, and requiring a small die area. The amplifier systems use a differential first stage and a second s... | 03/01/2011 |
| 7884671 | Low power operational amplifier An amplifier which operates with low power is provided. In the amplifier, a first input unit includes a first control circuit and a second control circuit each including one terminal connected to an output node and the other terminal connected to a respective input ... | 02/08/2011 |
| 7863981 | Rail-to-rail operational amplifier A rail-to-rail operational amplifier has a pair of input terminals and an output terminal, and includes first and second parallel-connected differential input stages configured to generate a differential output signal OUTN, OUTP in response to a differential input s... | 01/04/2011 |
| 7855600 | Two-stage operational amplifier with class AB output stage An operational amplifier includes a differential amplifier including an active load, a current mirror including a first branch and a second branch, a first switch connected between a first power source and an output node and switched in response to a voltage of a fi... | 12/21/2010 |
| 7834693 | Amplifying circuit An amplifier includes: a class AB input stage, receiving an input signal, for generating an inner signal according to the input signal; class AB output stage, includes: a biasing circuit, for providing a first voltage and a second voltage according to the inner sign... | 11/16/2010 |
| 7825729 | Class AB rail-to-rail operational amplifier An operational amplifier includes an output unit, a voltage drop element and a feedback unit. The output unit is provided for sourcing an output current to an output of the operational amplifier when operating with a power unit for providing a current being multiple... | 11/02/2010 |
| 7808320 | Buffer amplifier A buffer amplifier includes an input stage circuit, an output stage circuit and a bias circuit, providing a buffered output signal at an output terminal according to an input signal applied to a first input terminal. The input stage circuit generates four control si... | 10/05/2010 |
| 7795976 | Slew-rate-enhanced error amp with adaptive transconductance and single dominant pole shared by main and auxiliary amps An error amplifier can be used to control a power regulator transistor. The error amplifier has a main amplifier, a pull-up auxiliary amplifier, and a pull-down auxiliary amplifier that all drive an output. A compensating capacitor on the output sets a single domina... | 09/14/2010 |
| 7795975 | Class AB amplifier An amplifier is disclosed. An input transistor receives an input voltage. An impedance unit is coupled to a first electrode of the input transistor. A current source is coupled to a second electrode of the input transistor. A push-pull output circuit comprises a PMO... | 09/14/2010 |
| 7786801 | Operational amplifier having high slew rate and stability, and operating method thereof An operational amplifier includes a differential amplifier, an output stage, and a control unit. The differential amplifier generates a first current through a first output node and a second current through a second output node in response to a voltage difference be... | 08/31/2010 |
| 7786802 | Output stage circuit and operational amplifier thereof The present invention relates to an output stage circuit and an operational amplifier thereof. In the output stage circuit, one of a gate of a transistor is coupled to a gate of a bias transistor and a level shifter in response to a small signal outputted from an am... | 08/31/2010 |
| 7786800 | Class AB amplifier A class AB amplifier includes: a voltage amplifier stage operating off a first source voltage, and amplifying a differential input voltage to produce a first amplified voltage; a level shift stage coupled to the voltage amplifier stage and adjusting a direct current... | 08/31/2010 |
| 7777569 | Anti-pop method and apparatus for class AB amplifiers A method for actuating an amplifier to generally eliminate a pop is provided. Accordingly, a plurality of current sources is actuated in an input stage, and a plurality of bias voltages are applied to the input stage. After a predetermined period after the step of a... | 08/17/2010 |
| 7768351 | Variable gain current input amplifier and method Variable gain circuitry includes a first input transistor (M1) having a source coupled to a first conductor (32), a gate coupled to a first input voltage (Vin+), and a drain coupled to a second conductor (30). An input of a first current mirror ... | 08/03/2010 |
| 7764121 | Differential amplifier, method for amplifying signals of differential amplifier, and display driving device having differential amplifier A differential amplifier includes input, output, current summing, and switch circuits. The input circuit generates first and second differential currents in response to a voltage difference between differential input signals. The output circuit includes a first and ... | 07/27/2010 |
| 7764122 | Dual stage source/sink amplifier circuit with quiescent current determination An amplifier circuit includes a first stage to generate a first stage output based on a signal input and a control input. A second stage in communication with the first stage output and the control input. The second stage includes a first current source driver opera... | 07/27/2010 |
| 7760022 | Amplifier circuit Power consumption of current sources in an amplifier circuit is reduced even during amplifier operation while keeping linearity of an output signal. The amplifier circuit is suitable for use in a signal generator that provides an output signal previously set by a us... | 07/20/2010 |
| 7728669 | Output stage circuit and operational amplifier thereof The present invention relates to an output stage circuit and an operational amplifier thereof. In the output stage circuit, one of a gate of a transistor is coupled to a gate of a bias transistor and a level shifter in response to a small signal outputted from an am... | 06/01/2010 |
| 7724088 | Push-pull amplifier A push-pull amplifier includes a voltage inversion circuit 9 that uses an output of the differential amplifier 1 as an input signal, and includes a set of resistors 7a, 7b, and a differential amplifier 8 for inverting... | 05/25/2010 |
| 7724089 | Amplifying circuit First and second voltage buffers are added to an amplifying circuit including input and output amplifying stages in which a P-MOS transistor and an N-MOS transistor operate as a push-pull circuit. An input of the first voltage buffer is connected to an output of the... | 05/25/2010 |
| 7714655 | Closed loop surge protection technique for differential amplifiers A differential amplifier with surge protection is described. The differential amplifier includes a first output driver device, a second output driver device, a first replica device, a second replica device, a current comparator, and a clamp circuit. The first replic... | 05/11/2010 |
| 7705679 | Operational amplifier An operational amplifier includes a first differential stage, a second differential stage, a second cascade amplifier stage, an output unit, a first switching control unit and a second switching control unit. When an external signal for stopping operation is input, ... | 04/27/2010 |
| 7683715 | Feedback biasing technique for a stage of an amplifier that uses a feedback control loop having low gain According to an aspect of the present invention, a stage of an amplifier contains a positive feedback loop in addition to a negative feedback loop to maintain the bias currents at a desired level in the active components providing the output of the amplifier. The po... | 03/23/2010 |
| 7663439 | Operational amplifier The operational amplifier adapting to a source driver is provided herein. The operational amplifier includes the input module, the first and the second current mirror module, the switch control module and output stage module, wherein the input module includes the fi... | 02/16/2010 |
| 7652534 | Rail-to-rail operational amplifier capable of reducing current consumption A rail-to-rail operational amplifier capable of reducing current consumption includes an amplification stage circuit including a first compensation output terminal and a second compensation output terminal, for generating an amplified signal according to an input si... | 01/26/2010 |
| 7639078 | Class AB folded-cascode amplifier having cascode compensation A class AB folded-cascode amplifier having improved gain-bandwidth product, comprises a differential input circuit including a differential transistor pair coupled to a source of tail current and responsive to a differential input signal for conducting a first curre... | 12/29/2009 |
| 7602248 | Power amplifier and its idling current setting circuit An idling current setting circuit (3) includes: current setting transistors (Q3, Q4) connected to output transistors (Q1, Q2) in a driver (2) in current mirror form; a plurality of current setting resistors (R1 to R | 10/13/2009 |
