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| Number | Title | Issue Date |
| 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 |
| 7595690 | Voltage-clamping device and operational amplifier and design method thereof A voltage-clamping device used in an operational amplifier is provided. The operational amplifier comprises a first transistor. The cross-voltage between the gate and the source of the first transistor is near to a specific voltage and the cross-voltage between the ... | 09/29/2009 |
| 7583145 | Hybrid output stage apparatus and related method thereof The present invention discloses an apparatus for generating an output signal according to an input signal, including a signal generating circuit for generating a first and a second control signal according to the input signal; a first output stage has a first amplif... | 09/01/2009 |
| 7573333 | Amplifier and driving circuit using the same An amplifier in an embodiment of the present invention has MOS transistors connected serially between a power supply VDD and a ground terminal GND; an output terminal Vout connected to a node provided between the MOS transistors; a first mirror capacity provided bet... | 08/11/2009 |
| 7557658 | Low voltage amplifier having a class-AB control circuit A low voltage amplifier having a class-AB control circuit which generates minimal or no surge current when the output of the amplifier clips to ground or the negative rail. The amplifier includes an input stage, a summing circuit, a class-AB control circuit and an o... | 07/07/2009 |
| 7557659 | Slew-enhanced input stages and amplifiers Provided herein are input stages, and operation amplifiers including input stages. In an embodiment, an input stage includes a complimentary differential input transconductor, first and second npn-pnp current mirrors, and first and second pnp-npn current mirrors. Th... | 07/07/2009 |
| 7551030 | 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... | 06/23/2009 |
| 7548114 | Apparatus for slew rate enhancement of an operational amplifier The present invention discloses an apparatus for slew rate enhancement of an operational amplifier, wherein an auxiliary control device and an auxiliary output device are added to the output stage of an operational amplifier. The auxiliary control device mirrors the... | 06/16/2009 |
| 7545214 | Class AB rail-to-rail input and output operational amplifier An operational amplifier including an input stage. The input stage may include first and second differential input circuits and a first current mirror. When an input terminal of the operational amplifier is at a positive voltage rail, the first differential input ci... | 06/09/2009 |
| 7535302 | Operational amplifier and display device To reduce the apparent effect of offset voltage by making the offset voltage spatially scattered. An operational amplifier 1 includes: a first differential pair having N-channel MOS transistors MN1 and MN2; a second differential pair having P-ch... | 05/19/2009 |
| 7532071 | Operational amplifier circuit A level shifter unit outputting a level shifted signal generated by level shifting of output signals of the first and second differential amplifier circuits, and an output circuit including complementary output transistors series being coupled between the high poten... | 05/12/2009 |
| 7528656 | Push-pull amplifier and method for low noise amplification Provided is an amplifier including: an amplifier circuit receiving differential signals to generate amplified differential signals; a buffer generating buffered signals by buffering each signal generated by controlling a direct current (DC) component of the differen... | 05/05/2009 |
| 7528655 | Amplifier with improved compensation topology and related amplifier circuit, system, and method An embodiment of an amplifier includes an amplifier output node operable to provide an output signal, and an output stage. The output stage includes a drive buffer having an input node and an output node, a drive transistor, and a compensation capacitor. The drive t... | 05/05/2009 |
| 7518454 | Operational amplifier selecting one of inputs, and an amplifying apparatus using the OP amplifier the verification method A current feedback-type operational amplifier comprising multiple input parts and one output part, wherein each of the multiple input parts comprises a first input terminal, a second input terminal, and an output terminal, the signals input from the first input term... | 04/14/2009 |
| 7508265 | Rail-to-rail class-AB operational amplifier A rail-to-rail class-AB operational amplifier includes a first differential pair unit for receiving a pair of differential signals and generating a first control signal; a second differential pair unit for receiving the pair of differential signals and generating a ... | 03/24/2009 |
| 7501894 | Method of forming an operational amplifier and structure therefor In one aspect, an operational amplifier is configured to form a quiescent current that is a ratio of a current of a current source of the operational amplifier and to provide a load current to a load that is not ratioed to the current of the current source. ... | 03/10/2009 |
| 7474152 | Operational amplifier circuit An operational amplifier circuit has a differential input circuit including a first transistor, which receives a first input signal and generates a first voltage, and a second transistor, which receives a second input signal and generates a second voltage. An output... | 01/06/2009 |
| 7474153 | Dual stage source/sink amplifier circuit with quiescent current determination An amplifier circuit includes a first stage that receives a signal input and a control input and that generates first stage outputs. A second stage that communicates with the first stage and the control input and that includes a current source drivers. Each of the c... | 01/06/2009 |
| 7466199 | Low noise amplifier with low current consumption The invention relates to an amplifier circuit comprising supply terminals (12, 14) for supplying the circuit with first and second supply potentials (Vdd, Vss); a current path, which runs from the first supply terminal (12) via a first biased transisto... | 12/16/2008 |
| 7463094 | Linearized class AB biased differential input stage A linearized bipolar differential input stage that contains two high gain current mirrors coupled in series with the input voltage signal through the input transistors to allow the output differential current to greatly exceed the DC output current in a Class AB fas... | 12/09/2008 |
| 7453318 | Operational amplifier for outputting high voltage output signal An operational amplifier includes a differential amplifier circuit, receiving a low voltage signal, and a current mirror circuit provided on the downstream. The differential amplifier circuit also includes low withstand voltage N-channel transistors, connected to re... | 11/18/2008 |
| 7449951 | Low voltage operational amplifier An operational amplifier includes a differential amplifier for amplifying differential input signals to generate differential amplified signals. The operational amplifier also includes first and second single-ended amplifiers that each amplify the differential ampli... | 11/11/2008 |
| 7449952 | Amplifying circuit having a pull-up circuit and a pull-down circuit for increasing slew rate An amplifying circuit includes an operational amplifier, a pull-up circuit and a pull-down circuit. The operational amplifier generates a first pull-up signal, a first pull-down signal and an output signal, wherein the phases of the first pull-up signal and the firs... | 11/11/2008 |
| 7432922 | Source driver and source driving method A source driver for LCD devices, used for driving at least one data line, comprises an input for receiving a predetermined voltage; an output electrically being connected to the data line and having an output voltage; a voltage clamping circuit for clamping the outp... | 10/07/2008 |
| 7429972 | High slew-rate amplifier circuit for TFT-LCD system A high slew rate amplifying circuit, for a TFT-type of LCD system, includes: an operational amplifier; a pull-up transistor connected to the output of the operational amplifier; a pull-down transistor to the output of the operational amplifier; a control circuit to ... | 09/30/2008 |
| 7414473 | 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... | 08/19/2008 |
| 7414474 | Operational amplifier An operational amplifier with a broad applicable band and little disturbing noise which is capable of preventing oscillation even when used in connection with a negative feedback path. The operational amplifier amplifies a difference between two input voltage signal... | 08/19/2008 |
| 7405622 | Operational amplifier with less offset A differential amplifier includes an input stage circuit including a first differential pair and a second differential pair which are complementary to each other; a first current mirror circuit connected with the first differential pair and configured to function as... | 07/29/2008 |
| 7373090 | Modulator driver circuit with selectable on-chip termination A method and apparatus to accommodate differing output loads without sacrificing impedance matching in an optical modulator driver. ... | 05/13/2008 |
| 7368994 | Class AB enhanced transconductance source follower A low voltage, high bandwidth, enhanced transconductance, source follower circuit constructed from MOS FET devices, which operates in a class AB mode. The drain current of the source follower is sensed with a folded cascode device. The sensed current is multiplied b... | 05/06/2008 |
| 7368984 | Switching class A-B amplifier A circuit configuration and a method enables less-expensive bipolar switching devices to be employed in high-accuracy class D amplifiers. A constant-bias current is provided between the switching devices of a class D amplifier, and, through feedback or appropriate a... | 05/06/2008 |
| 7368948 | Integrated receiver circuit An integrated receiver circuit for amplifying an input signal based on a reference signal includes two voltage converters to respectively convert the input and reference signals to level-converted input and reference signals. An amplifier stage includes a PMOS input... | 05/06/2008 |
| 7362176 | High efficiency linear amplifier A linear amplifier is configured with a current-feedback amplifier followed by a voltage-feedback amplifier to drive a totem-pole output stage. The output stage includes a series arrangement of an npn transistor and a pnp transistor with their emitters coupled in se... | 04/22/2008 |
| 7358812 | Class AB operational buffer A class AB operational buffer comprises an output stage, a voltage supply circuit to provide a first voltage and a second voltage to drive the output stage, a first current source to provide a first current, a second current source to provide a second current, a fir... | 04/15/2008 |
| 7352243 | Voltage comparator circuit A voltage comparator that realizes high-speed operation with a simple structure includes an input differential stage having a first differential pair and a second differential pair, into which a differential voltage is inputted from differential input terminals In | 04/01/2008 |
| 7348850 | Electronic circuit for amplification of a bipolar signal Consistent with an example embodiment, there is an electronic circuit for amplification of bipolar symmetric current signals. The electronic circuit has a pair of complimentary current mirrors. Depending on the polarity of the bipolar current signal one or the curre... | 03/25/2008 |
| 7348851 | Miller-compensated amplifier A Miller-compensated amplifier, having an amplifier input and an amplifier output, comprises a first gain stage, a second gain stage, a third gain stage, and a capacitor. The first gain stage has the amplifier input as a first gain stage input thereto and a first ga... | 03/25/2008 |