Did You Know...
...that when IBM conducted a market study of Chester Carlson's invention in 1959, the company concluded that it would take only 5000 units of his new product to saturate the market? IBM therefore declined to be part of the new product introduction. Too bad for IBM. Carlson's invention was the xerography process, and his new product was the beginning of the Xerox Corporation. It is estimated that every day, worldwide, 3,000,000,000 copies are made!!
PatentStorm News
Make the Most of Our Site
See this month's Top Inventors and Most Cited Patents.
Stay on top of the latest innovations by subscribing to an RSS feed.
Registered users: Manage your profile.
| Number | Title | Issue Date |
| 8183921 | Offset cancellation for continuous-time circuits One embodiment relates to a continuous-time circuit configured with an offset cancellation loop. The continuous-time circuit includes a multi-stage amplifier chain, including a first amplifier stage and a last amplifier stage, and an offset cancellation loop. The of... | 05/22/2012 |
| 8138834 | Current control circuit, class AB operational amplifier system and current control method A current control circuit for controlling a bias current of a class AB operational amplifier includes: a low current source, for generating a low bias current; a high current source, for generating a high bias current, which is greater than the low bias current; and... | 03/20/2012 |
| 8130036 | Input common mode circuit A circuit provides a first current corresponding to the differential input Inn and Inp, and a second current corresponding to the common mode input Vcm. The circuit then mirrors the differential current and the common mode current to a third current and a fourth cur... | 03/06/2012 |
| 8102211 | Rail-to-rail input stage circuit with dynamic bias control An improved rail-to-rail (R-R) input stage circuit with dynamic bias control is described. Input stage circuit includes a differential pair circuit, a level shifted differential pair and a bias control circuit. The differential pair circuit and the level shifted dif... | 01/24/2012 |
| 8098098 | Amplifier circuit, integrated circuit device, and electronic instrument An amplifier circuit includes an amplifier section that includes a P-type differential section, an N-type differential section, and an output section, an offset adjustment section that adjusts an offset of the amplifier section, a first offset adjustment register th... | 01/17/2012 |
| 8085093 | Differentially compensated input pair The invention is directed to an amplifier including an absolute value circuit. The absolute value circuit may be driven by differential potentials and may include a first pair of transistors modulating a tail current of the amplifier when a differential input voltag... | 12/27/2011 |
| 8058929 | Maintaining loop linearity in presence of threshold adjustment In one embodiment, a method includes receiving, at a filter comprising a Miller amplifier, a differential data signal output by a limiting amplifier (LA), the data signal comprising an output direct current (DC) offset resulting at least in part from a threshold-adj... | 11/15/2011 |
| 8031001 | Differential amplifier, reference voltage generating circuit, differential amplifying method, and reference voltage generating method A differential amplifier includes a main differential amplifier circuit that receives a pair of input signals and supplies a pair of output signals based on a difference between the input signals; and a bias control differential amplifier circuit that receives the p... | 10/04/2011 |
| 8031000 | Differential amplifier, sample-and-hold circuit, and amplifier circuit To provide a common-mode feedback circuit that feeds back signal corresponding to common-mode components of output terminal voltage of first and second amplifiers to input terminals of the first and second amplifiers via first and second passive elements connected t... | 10/04/2011 |
| 7924096 | Input buffer with impedance cancellation An exemplary negative impedance converting circuit for functioning as a voltage buffer and/or negating the impedance of a connected load. The negative impedance converting circuit includes inputs, outputs, a first transconductance stage and a second transconductance... | 04/12/2011 |
| 7898332 | Semiconductor integrated circuit device A semiconductor integrated circuit device includes: an amplifier circuit which respectively has one or more input terminals and one or more output terminals; a replica circuit which has the same DC characteristics as those of the amplifier circuit; a reference volta... | 03/01/2011 |
| 7782137 | Differential circuit providing a function to cancel input offset voltage A new offset canceling circuit for a differential circuit is disclosed whose input offset voltage may be cancelled independent of the variation of the input level, accordingly, enables the cut-off frequency of the canceling circuit unchanged. The offset canceller of... | 08/24/2010 |
| 7768352 | High-speed, multi-stage class AB amplifiers A multi-stage Class AB amplifier system comprises a first Class AB amplifier circuit that receives an input signal. A bias circuit receives an output of the first Class AB amplifier circuit. A second Class AB amplifier circuit having an input that communicates with ... | 08/03/2010 |
| 7750737 | Common mode stabilization in a fully differential amplifier A fully differential amplifier circuit provided according to an aspect of the present invention contains a stabilization block to measure the common mode component at the output of an input stage, and to inject a current proportionate to the common mode component in... | 07/06/2010 |
| 7746171 | Amplifier networks with controlled common-mode level and converter systems for use therewith Effective control of the common-mode level of amplifiers is obtained through control structures (both closed-loop and open-loop structures) which are directed to various amplifier functions such as the reduction of amplifier loading, accurate sensing of common-mode ... | 06/29/2010 |
| 7683717 | Fully differential amplifier with continuous-time offset reduction Fully differential amplifier circuits are described herein that set the common mode voltage as well as reduce the output offset voltage (offset cancellation). A circuit according to one embodiment includes a first section for generating first and second output signa... | 03/23/2010 |
| 7602249 | Amplifier electronic circuit comprising a differential pair and a feedback system An amplifier electronic circuit with at least one amplifier stage, including a differential pair that includes two input transistors controlled by respective input signals and means for measuring the common mode output voltage of the amplifier, includes at least one... | 10/13/2009 |
| 7564308 | Self-biased operational amplifier An operational amplifier in accordance with one embodiment of the invention includes folded cascode transistors and a self-biased common-mode feedback circuit coupled to the folded cascode transistors. The operational amplifier can include an output stage coupled to... | 07/21/2009 |
| 7545215 | Circuit to prevent load-induced DC nonlinearity in an op-amp A circuit for removing non-linearity produced when an amplifier includes a load that results in non-linear current levels is provided. The circuit includes a first transistor element being coupled to one of the differential inputs associated with the amplifier. A se... | 06/09/2009 |
| 7439804 | Amplifier with level shifting feedback network An amplifier circuit includes a low noise first stage and a wide dynamic range second stage. A feedback network coupled between the output of the second stage and the input of the first stage provides DC level shifting of the common mode input voltage. The common mo... | 10/21/2008 |
| 7436262 | Highly linear variable gain amplifier Disclosed are systems and methods which provide very linear amplification of signals using a linearized transconductance circuit. A transconductance amplifier configuration is shown which provides highly linearized operation utilizing a Darlington pair feedback circ... | 10/14/2008 |
| 7425868 | Apparatus and method for canceling DC output offset A transconductor for substantially canceling or reducing a direct current (DC) output offset and a method thereof are provided. The transconductor includes a differential amplifier, a sensing circuit, and a feedback current generation circuit. The differential ampli... | 09/16/2008 |
| 7408410 | Apparatus for biasing a complementary metal-oxide semiconductor differential amplifier A bias generation circuit for biasing a differential amplifier is disclosed. The bias generation circuit is coupled to the differential amplifier. After determining a common-mode voltage of a pair of differential outputs from the differential amplifier, the bias gen... | 08/05/2008 |
| 7400195 | Variable-gain differential amplifier A variable-gain amplifier with high input impedance includes positive and negative inputs, positive and negative outputs, first and second differential circuits and first, second and third impedances. The impedances form an impedance bridge between the outputs. The ... | 07/15/2008 |
| 7391264 | Amplifier The objective of the invention is to automatically and dynamically change the slew rate corresponding to the change rate and amplitude of the input signal. In this operational amplifier, when voltage (Vin) of the input signal is high, or when it changes d... | 06/24/2008 |
| 7372331 | Receiver circuit A receiver circuit for receiving and forwarding data signals comprises at least one first and one second input to be used to inject an external digital data signal and a reference signal into the receiver circuit, a multistage input amplifier circuit which comprises... | 05/13/2008 |
| 7356317 | Adaptive-biased mixer A system or method for a circuit network that receives an RF signal, and where a plurality of switching transistors receive an RF signal output by the circuit network and perform mixing with a local oscillation (LO) signal received on a LO input. An active bias circ... | 04/08/2008 |
| 7348846 | Amplifier arrangement The present invention relates to an amplifier arrangement having a plurality of amplifier stages that form a series circuit. Each amplifier stage comprises a current mirror, the translation ratio of which defines the gain of the amplifier stage. Moreover, a current ... | 03/25/2008 |
| 7345544 | Method and apparatus for common mode control A common mode feedback circuit is provided that can set a direct voltage operating point of the outputs of an associated amplifier. The common mode feedback circuit can remain powered on during power down of the associated amplifier and maintain a large feedback loo... | 03/18/2008 |
| 7342458 | Negative gain transductance amplifier circuit The invention proposes a negative gain transconductance amplifier circuit (1) for capacitive load that includes: an RC serial circuit connected between an input terminal (E) of the amplifier circuit and a intermediate terminal (A); an amplificat... | 03/11/2008 |
| 7330075 | Output impedance control circuit and control method thereof The invention provides an apparatus and a method for adjusting an output impedance of an output stage. The apparatus comprises a detector for outputting a direct current potential corresponding to the impedance of the output stage circuit. It also comprises a contro... | 02/12/2008 |
| 7327184 | Low-power multi-level pulse amplitude modulation driver and semiconductor device having the driver A low-power multi-level pulse amplitude modulation (PAM) driver, and a semiconductor device having the same, in which the multi (M)-level PAM driver includes a load unit, first and second current sources, a pair of first input transistors, a pair of second input tra... | 02/05/2008 |
| 7323936 | Input circuit for receiving an input signal, and a method for adjusting an operating point of an input circuit The present invention relates to an input circuit for receiving an input signal in an integrated circuit, having a differential amplifier whose first input can have a predetermined reference voltage applied to it and whose second input can have the input signal appl... | 01/29/2008 |
| 7312598 | Capacitor free low drop out regulator A low drop out (LDO) regulator that includes a novel error amplifier, which is arranged with a first stage that employs both NMOS and PMOS devices that are similarly doped in differential pairs and a second stage that operates with NMOS and PMOS devices in a push-pu... | 12/25/2007 |
| 7312658 | Differential amplifier with two outputs and a single input of improved linearity A differential amplifier having a first and second output terminals and receiving an input signal at an input terminal. The amplifier comprises a first amplifier having a first input connected to the input terminal, a second input and a first output connected togeth... | 12/25/2007 |
| 7301391 | Filtering variable offset amplifier A current summing FIR filter can be implemented with multiple differential input stages and variable tail currents. The variable tail currents can be used to appropriately weight the present and previous digital input signals. The weighted outputs of the differentia... | 11/27/2007 |
| 7298210 | Fast settling, low noise, low offset operational amplifier and method An amplifier (10) includes a first stage (4) including differentially coupled first (Q1) and second (Q2) input transistors and a controlled active load circuit (6). A second stage (8) includes differentially coupled third (Q... | 11/20/2007 |
| 7279976 | Differential amplifier with controlled common mode output voltage A differential amplifier circuit with a self-controlled common mode output voltage. ... | 10/09/2007 |
| 7271659 | High speed amplifier incorporating pre-emphasis An amplifier circuit for receiving an input signal and providing an output signal, comprises a main chain of logic stages with a plurality of nodes therebetween, and at least one auxiliary chain nested between one node in the main chain and another node, which is no... | 09/18/2007 |
| 7262662 | Operational amplifier The present invention is a folded cascode operational amplifier provided with a differential input portion 10, cascode current source portion 20, current mirror portion 30, output portion 40, and differential amplifier 50 serving a... | 08/28/2007 |
