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| Number | Title | Issue Date |
| 8183922 | Differential pair with constant offset A bias current is generated for an unbalanced differential pair that is proportional to the transconductance gain of the differential pair. When the transconductance gain varies (e.g., due to temperature variations), the bias current varies in proportion thereby mai... | 05/22/2012 |
| 8149055 | Semiconductor integrated circuit device A semiconductor integrated circuit device constituting an inverting amplifier employs a cascode current source as a current source. In the semiconductor integrated circuit device, a high-potential-side transistor of the cascode current source and a low-potential-sid... | 04/03/2012 |
| 8130037 | Apparatus and method for reducing current noise An input bias current cancellation circuit includes reference transistors placed in series and a current summation network. The current summation network can be configured to sum the base currents of the reference transistors to produce a summed current. A current m... | 03/06/2012 |
| 8018282 | Driving circuit system and method of elevating slew rate of operational amplifier The invention discloses a driving circuit system and a method of elevating a slew rate of an operational amplifier. The driving circuit system comprises an operational amplifier, a judging module and a bias enhancing module. The operational amplifier has an input st... | 09/13/2011 |
| 7944300 | Bias circuit and amplifier providing constant output current for a range of common mode inputs Bias circuits, amplifiers and methods are provided, such as those for providing bias signals over a range of common mode inputs for an amplifier to output a constant current. One example of a bias circuit is configured to generate a bias signal having a voltage magn... | 05/17/2011 |
| 7863982 | Driving circuit capable of enhancing response speed and related method A driving circuit of enhancing response speed is disclosed. The driving circuit includes an operational amplifier and a slew rate enhancement unit. The operational amplifier is utilized for generating a driving voltage according to an input voltage. The slew rate en... | 01/04/2011 |
| 7852159 | Method for adaptive biasing of fully differential gain boosted operational amplifiers An adaptive biasing technique improves fully differential gain boosted operational amplifiers transient characteristics and reduces power consumption. An adaptive biasing module includes a bias generation module and a bias replication module. The bias generation mod... | 12/14/2010 |
| 7834698 | Amplifier with improved linearization According to some embodiments, an amplifier may include a transconductance stage, a tail current source stage, and an adaptive biasing stage. The transconductance stage may be configured to receive an input voltage. The tail current source stage may be configured to... | 11/16/2010 |
| 7755427 | Operational amplifier and related method of enhancing slew rate An operational amplifier capable of enhancing slew rate is disclosed. The operational amplifier includes a first current generator for generating a first bias current, a second current generator for generating a second bias current, an amplification stage, coupled t... | 07/13/2010 |
| 7741911 | Circuit and method for dynamic current compensation An operational amplifier includes a first stage and a second stage, the first stage for receiving two input signals and the second stage being coupled to the first stage, wherein the second stage includes a first part with a first output of the operational amplifier... | 06/22/2010 |
| 7733181 | Amplifier circuit having dynamically biased configuration Methods and corresponding systems for amplifying an input signal include inputting first and second differential input signals into first and second circuit legs, respectively, wherein the first circuit leg includes a first transistor coupled in series with a first ... | 06/08/2010 |
| 7701291 | Gain improved operational transconductance amplifier and control method thereof A variable bias current is provided for the differential pair of an operational transconductance amplifier to improve the gain performance, especially to overcome the slew rate limit of the operational transconductance amplifier. The bias current is adjusted accordi... | 04/20/2010 |
| 7696825 | Apparatus for receiving input and bias signals at common node An apparatus includes an input-bias node and an internal load. The input-bias node is configured to simultaneously receive an input signal and a bias signal through an input-bias port. The internal load is connected between the input-bias node and multiple output po... | 04/13/2010 |
| 7671678 | Serial link output stage differential amplifier and method Protection for the transmission of higher amplitude outputs required of differential amplifiers formed by thin oxide transistors with limited maximum voltage tolerance used where compliance with communication protocol standards requires handling voltages which may, ... | 03/02/2010 |
| 7609112 | Boosted tail-current circuit A circuit includes a pair of input transistors configured as a differential pair and having input terminals configured to receive an input voltage. The circuit also includes a first current source connected to and configured to provide a first tail current to the pa... | 10/27/2009 |
| 7605658 | Resistively loaded single stage differential amplifier having zero volt common mode input A resistively folded single stage differential amplifier capable of accommodating a low input common mode without impacting the performance of a bias current source, while also providing a high input impedance to allow for the use of the linear termination resistors... | 10/20/2009 |
| 7598807 | Differential amplifier circuit, voltage regulator using the differential amplifier circuit, and method for controlling the differential amplifier circuit A differential amplifier circuit, a voltage regulator using the differential amplifier circuit, and a method for controlling the differential amplifier circuit. The circuit includes a differential pair having a plurality of transistors, a first bias current generato... | 10/06/2009 |
| 7583147 | Buffer drive The present invention relates to a CMOS buffer circuit for liquid crystal display (LCD) drivers, which includes a single stage operational transconductance amplifier (OTA) with a differential of transistors for receiving a differential input voltage, a bias current ... | 09/01/2009 |
| 7573334 | Bias control circuitry for amplifiers and related systems and methods of operation Embodiments of the invention comprise methods, apparatuses and systems for a dynamic bias control circuit configured to dynamically bias an amplifier. The dynamic bias control circuitry includes four branches. Each of the four branches includes a transistor operably... | 08/11/2009 |
| 7564309 | Wide input common mode for input bias current cancellation Described herein is technology for, among other things, input bias current cancellation. The technology includes a bipolar differential pair coupled with a supply voltage (VCC). The bipolar differential pair includes a first transistor and a second transi... | 07/21/2009 |
| 7554404 | Method and system for a low noise amplifier with tolerance to large inputs Methods and systems for a low noise amplifier with tolerance to large inputs are disclosed. Aspects of one method may include providing an individual current source for each input transistor to a low noise amplifier (LNA), wherein the individual current sources may ... | 06/30/2009 |
| 7554405 | Adaptive biasing input stage and amplifiers including the same An adaptive biasing input stage includes pairs of differentially coupled amplifying and sensing field effect transistors having gates with differential inputs applied thereon. In addition, a static current source is coupled to sources of the amplifying and sensing f... | 06/30/2009 |
| 7545216 | Amplifier with current mirror bias adjust An amplifier includes a differential amplifier stage, a voltage amplification stage and a power output stage. The bias level of the output stage is proportional to current through the voltage amplification stage. The voltage amplification stage includes a current mi... | 06/09/2009 |
| 7541872 | Startup circuit for subregulated amplifier A multi-stage circuit has a first stage powered by the output voltage of a next stage. A current source within the first stage provides a tail current for a differential amplifier within the first stage. When the first stage has an operating voltage high enough for ... | 06/02/2009 |
| 7538616 | Wideband low distortion/low power A differential circuit is described having first, second, third and fourth devices, each device having a control terminal and first and second terminals. The first and second devices are arranged to receive a differential input signal at their respective control ter... | 05/26/2009 |
| 7525383 | Differential amplifier Connected to a differential transistor pair are a load current source and a tail current source. A bias circuit controls current generated by the load current source. A first self-bias switch is provided between a gate and a drain of a first input transistor; and a ... | 04/28/2009 |
| 7525382 | Multi-level slew and swing control buffer A buffer amplifier and an associated method have been provided for slew rate and swing level control in the buffering of a signal. The method accepts an input signal having a voltage swing, a swing control signal, and a slew rate control signal. The voltage swing fo... | 04/28/2009 |
| 7525381 | Amplifier structures that enhance transient currents and signal swing Amplifier embodiments are provided that are well suited for systems which require high signal gains and high transient currents that can drive various loads (e.g., capacitive loads). At least one amplifier embodiment is realized with a cascoded complementary differe... | 04/28/2009 |
| 7522000 | Design structure for a serial link output stage differential amplifier A design structure embodied in a machine readable storage medium for designing, manufacturing, and/or testing a design for protection for the transmission of higher amplitude outputs required of differential amplifiers formed by thin oxide transistors with limited m... | 04/21/2009 |
| 7492226 | Linearization apparatus of triode region type operational transconductance amplifier Provided is a linearization apparatus of a triode region type operational transconductance amplifier that can provide a wide linear input range even when a differential pair input transistor having a short channel length is used at a low power supply voltage. The li... | 02/17/2009 |
| 7443240 | AM intermediate frequency variable gain amplifier circuit, variable gain amplifier circuit and its semiconductor integrated circuit It is an object of the present invention to provide a variable gain amplifier circuit operable with a low power supply voltage and with less noise generated inside the circuit. In the variable gain amplifier circuit, a third MOS transistor is connected between the r... | 10/28/2008 |
| 7425867 | Differential input/differential output converter circuit A differential input/differential output converter circuit. The circuit comprises differential complementary input modules each comprising cross-coupled devices for biasing current mirror masters to a condition that increases the operating speed in response to a tra... | 09/16/2008 |
| 7423486 | Silicon-on-insulator differential amplifier circuit A differential amplifier formed on a silicon-on-insulator substrate, including means to prevent the bodies of its differential input transistors from charging to unwanted potentials in the standby state. In one aspect of the invention, the means takes the form of sw... | 09/09/2008 |
| 7414472 | Differential amplifying circuit Disclosed is a differential amplifying circuit including an amplifying circuit, wherein 1) a drain of a sixth transistor is connected to a drain of an eighth transistor, and a drain of a tenth transistor is connected to a drain of a fourth transistor, and 2) a ratio... | 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 |
| 7414475 | Linearity-improved differential amplification circuit A linearity-improved differential amplification circuit is provided, A linearity-improved differential amplification circuit comprises a main differential amplification unit differentially amplifying a first and a second input signals, a main bias unit biasing the m... | 08/19/2008 |
| 7411452 | Low DC power rail-to-rail buffer amplifier for liquid crystal display application A low DC power rail-to-rail buffer amplifier is suitable for liquid crystal display application. The buffer amplifier comprises: a dc bias stage, a pair of complementary differential amplifiers, a second stage amplifier, and output stage. The dc bias stage is used f... | 08/12/2008 |
| 7411453 | Tail-current steering circuit and method for rail-to-rail operational amplifier input stage An amplifier includes first and second pairs of differentially coupled input transistors. The first current mirror generates a reference current which is mirrored by a second current mirror to produce a mirrored reference current. Current steering circuitry steers t... | 08/12/2008 |
| 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 |
| 7400203 | Circuit with Q-enhancement cell having feedback loop According to an example embodiment, an amplitude feedback loop may include an RF amplifier, a detector, a comparator, and a Q-enhancement cell. In an example embodiment, the RF amplifier has an output signal, and the detector has an input coupled to the output signa... | 07/15/2008 |
