Did You Know...
...that two musicians were responsible for the invention of color print film? Fascinated by photography, Leopold Godowsky and Leopold Mannes worked together to produce an easy-to-use, practical color film. They worked full time as music teachers and gave concerts while experimenting during their off hours in Mannes' kitchen. Their success earned them full-time, well-paying jobs at Kodak and their efforts resulted in Kodachrome film, which was introduced in 1935.
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| Application No. | Application Title | Issue Date |
| 20110316630 | PUSH-PULL LINEAR HYBRID CLASS H AMFLIER Several push-pull linear hybrid class H amplifiers are disclosed. A split power rail provides a positive supply rail and a negative supply rail in response to a power supply control voltage. A push-pull amplifier stage is powered by the positive and negative supply rail... | 12/29/2011 |
| 20110285465 | OPERATIONAL AMPLIFIER HAVING A COMMON MODE FEEDBACK CIRCUIT PORTION An operational amplifier that can suppress lowering of the current driving capability while performing a self adjustment of the common mode voltage is disclosed. A common mode voltage adjusting transistor and an auxiliary transistor are connected in parallel with a low-... | 11/24/2011 |
| 20110050342 | Push-pull amplifier circuit and operational amplifier circuit using the same A push-pull amplifier including first to third current paths. The first current path includes first transistor allowing first current to flow through the first current path according to input signal. The second current path includes second transistor allowing second cur... | 03/03/2011 |
| 20100321112 | Anti-Pop Circuit Presently many audio chips suffer from pop issues, which is especially serious for single ended audio drivers. An audio pop is a disturbance in the output caused by a sudden transition of chip power, particularly when a chip is powered on or powered off. Furthermore, co... | 12/23/2010 |
| 20100244959 | 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 include... | 09/30/2010 |
| 20100164625 | 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 dominant p... | 07/01/2010 |
| 20100148869 | POWER AMPLIFICATION CIRCUIT HAVING TRANSFORMER In order to realize a wider bandwidth of a frequency characteristic of a power amplification circuit, outputs of differential push-pull amplifiers which are matched at respectively different frequencies are combined together by secondary inductors, and the combined sign... | 06/17/2010 |
| 20100073214 | DIFFERENTIAL OPERATIONAL AMPLIFIER CIRCUIT CORRECTING SETTLING ERROR FOR USE IN PIPELINED A/D CONVERTER A telescopic differential operational amplifier circuit for use in a pipelined A/D converter is provided with two auxiliary differential amplifiers connected to two cascode circuits, each including cascode-connected first to fourth transistors. During the sampling phase... | 03/25/2010 |
| 20100001799 | AMPLIFIER CURRENT DRIVE REVERSAL A drive current direction between first and second amplifiers can be selected using a received indication of an output current in an at least partially reactive load, and an amplified output signal can be produced using the selected drive current direction and the first... | 01/07/2010 |
| 20090278602 | 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 replica de... | 11/12/2009 |
| 20090251215 | 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 reduced... | 10/08/2009 |
| 20090160555 | APPARATUS FOR POWER AMPLIFICATION BASED ON ENVELOPE ELIMINATION AND RESTORATION (EER) AND PUSH-PULL SWITCHING A power amplifying apparatus based on envelope elimination and restoration (EER) includes a voltage amplifier to amplify a high frequency component of an envelope signal, a switching amplifier to generate a low frequency component signal of a drain bias based on a first... | 06/25/2009 |
| 20090146738 | 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 first ... | 06/11/2009 |
| 20090140811 | 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 amp... | 06/04/2009 |
| 20090115517 | APPARATUS AND METHOD FOR LOW POWER RAIL-TO-RAIL OPERATIONAL AMPLIFIER A rail-to-rail amplifier is provided. The rail-to-rail amplifier includes a p-type differential pair, an n-type differential pair, switches, and an output stage. The switches are arranged to selectively couple either the p-type differential pair or the n-type differenti... | 05/07/2009 |
| 20090115519 | 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 R4 | 05/07/2009 |
| 20090091388 | 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 cur... | 04/09/2009 |
| 20090066416 | Push-pull amplifier A push-pull amplifier is provided which, without depending on the overdrive voltage, can increase the peak value of the gate voltage for the output transistor to a level still higher than the conventional one, and is capable of producing an output current with low consu... | 03/12/2009 |
| 20090058523 | Amplifying circuit An amplifying circuit comprising an output stage circuit composed of a first and a second output transistor and operating as a class AB push-pull circuit reduces electricity consumed by an idle current. A pre-stage circuit outputs a first and a second control signal, an... | 03/05/2009 |
| 20090051432 | High-bandwidth high-gain amplifier A pipelined analog to digital converter includes a first stage that receives an input voltage, that generates a first sampled digital value and a first residue voltage, and that includes a first amplifier that amplifies the first residue voltage and generates a first am... | 02/26/2009 |
| 20090051431 | HIGH-SWING OPERATIONAL AMPLIFIER OUTPUT STAGE USING ADAPTIVE BIASING An output stage includes two transistors (switching transistor and biasing transistor) coupled in series in a pullup current path between a VDDA node and an output node, and also includes two transistors (switching transistor and biasing transistor) coupled in series in... | 02/26/2009 |
| 20090039959 | 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 seco... | 02/12/2009 |
| 20080297254 | 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 lev... | 12/04/2008 |
| 20080278232 | 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 input... | 11/13/2008 |
| 20080278234 | Output stage An output stage, comprising a first transistor operable to pull a voltage at an output node towards a first voltage, and a rechargeable energy store having a potential difference between first and second terminals wherein the rechargeable energy store is arranged to be ... | 11/13/2008 |
| 20080265993 | 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 circui... | 10/30/2008 |
| 20080265990 | Semiconductor circuit An amplifier includes differential output and input stages. The differential output stage includes first and second current paths outputting differential signals and connected between first and second power supplies. The first current path includes a first resistance be... | 10/30/2008 |
| 20080238545 | 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 fashion... | 10/02/2008 |
| 20080231364 | 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 first pu... | 09/25/2008 |
| 20080191804 | 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 first ... | 08/14/2008 |
| 20080169876 | 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.... | 07/17/2008 |
| 20080116973 | Distributed multi-stage amplifier Exemplary techniques for implementing an amplifier suitable for RF amplification, such as a tuned class DE amplifier, are disclosed. One disclosed embodiment of a circuit for amplifying an RF signal includes a push-pull amplifier comprising a push transistor and a pull ... | 05/22/2008 |
| 20080111626 | 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 seco... | 05/15/2008 |
| 20080088375 | Class Ad Audio Amplifier The amplifier (10) includes: an output (14) for feeding a load (16); a voltage generator (18) presenting very high linearity and very low output impedance; | 04/17/2008 |
| 20080036538 | RAIL-TO-RAIL CLASS AB AMPLIFIER A rail-to-rail class AB amplifier includes an input circuit for converting a voltage difference between a first input signal and a second input signal into respective currents, a first current adder circuit for adding a drain current of a first input NMOS transistor and... | 02/14/2008 |
| 20080030272 | 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 trans... | 02/07/2008 |
| 20080001666 | Saturation Detector and Warning Circuit Including Clamp A saturation detection and warning circuit having an adaptive threshold voltage is disclosed. The disclosed circuit can also be used to detect the impending drop out of the low drop out linear voltage regulator. A clamp circuit that clamps the amplifier's output voltage... | 01/03/2008 |
| 20070296499 | AMPLIFIER CIRCUIT HAVING A COMPENSATION CIRCUIT COUPLED TO AN OUTPUT NODE OF AN OPERATIONAL AMPLIFIER FOR IMPROVING LOOP STABILITY An amplifier circuit includes an operational amplifier and a compensation circuit. The operational amplifier includes an amplifying stage for amplifying an input signal to generate an amplifying signal; and an output stage coupled to an output node of the amplifying sta... | 12/27/2007 |
| 20070290754 | 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 differential... | 12/20/2007 |
| 20070252647 | Operational amplifier An operational amplifier includes: a differential amplifier circuit configured to receive an inverting input voltage (VIN−) and a non-inverting input voltage (VIN+); and an auxiliary circuit for improving a slew rate of an output voltage of the differential amplifier ... | 11/01/2007 |
