Amplifiers inventions 03/09

20090079498 - Offset cancellation in a capacitively coupled amplifier: A method for calibrating an offset voltage of an amplifier used to amplify capacitively coupled communication signals is described. During this process, a common voltage is applied to one or more inputs to the amplifier. Next, an output of the amplifier is iteratively, measured, and charge is applied to the... Agent: Pvf -- Sun Microsystems Inc. C/o Park, Vaughan & Fleming LLP

20090079499 - Differential low noise amplifier (lna) with common mode feedback and gain control: A method, algorithm, architecture, circuits, and/or systems for low noise amplification are disclosed. In one embodiment, an amplifier can include an input stage, including a first differential input configured to receive a differential signal, a first current source coupled to the first differential input, a first current load receiving a... Agent: Epson Research And Development Inc Intellectual Property Dept

20090079500 - Analog variable gain amplifier with improved dynamic range characteristics: An automatic gain control (AGC) system and method for implementing a wide dynamic range automatic gain control (AGC) are disclosed. The AGC system features a large gain adjustment suitable for integration in silicon tuners. The AGC structure employs a pair of classical current steering stages, architecturally arranged to share the... Agent: Carrie A. Boone, P.C.

20090079501 - Programmable gain circuit and amplification circuit: One aspect of the embodiments relates to a programmable gain circuit including an amplification unit amplifying an input signal, an input resistor coupled to an input terminal of the amplification unit, a feedback resistor coupled between an output terminal of the amplification unit and the input terminal of the amplification... Agent: Arent Fox LLP

20090079502 - 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 the invention provides a buffer amplifier and a filter. The... Agent: Smith, Gambrell & Russell

20090079503 - Overload recovery circuit for folded cascode amplifiers: In a method and apparatus for rapidly recovering an improved amplifier from an overload condition, a cascode amplifier (CASA) having a pair of inputs and an output is coupled to an overload recovery circuit (ORC). The pair of inputs is coupled to receive a differential input signal. A deviation in... Agent: Texas Instruments Incorporated

20090079504 - Circuit arrangement and method for power regulation and amplifier arrangement: A circuit arrangement and method for power regulation and an amplifier arrangement for power regulation are described.... Agent: Lee & Hayes, PLLC

20090079505 - Ground skimming output stage: Ground skimming output stages that are designed to drive wideband signals with the ability to provide a high quality output signal all the way to the low supply rail are provided. In accordance with an embodiment of the present invention, the output stage of the present invention includes a translinear... Agent: Fliesler Meyer LLP

20090072897 - Sigma-delta class-d amplifier and control method for a sigma-delta class-d amplifier: A sigma-delta class-D amplifier includes a quantizer to quantize an input to produce a digital signal, and an output stage to produce an output according to the digital signal. The quantizer has a smaller step size so that the digital signal has at least five logical levels, and the sigma-delta... Agent: Rosenberg, Klein & Lee

20090072898 - Systems and methods of rf power transmission, modulation, and amplification, including blended control embodiments: Embodiments of the present invention enable a blended control approach to generate a desired output waveform in an outphasing-based system. Embodiments of blended control according to the present invention combine outphasing with bias and/or amplitude control to yield an accurate, practical, and producible system with substantially comparable performance to that... Agent: Sterne, Kessler, Goldstein & Fox P.l.l.c.

20090072899 - Sharing operational amplifier between two stages of pipelined adc and/or two channels of signal processing circuitry: A mechanism for discharging parasitic capacitance at an input of an operational amplifier, which is shared between two stages of a pipelined analog-to-digital converter and/or two channels of signal processing circuitry, before the amplifier configuration of the stages/channels is switched. The discharging act occurs when a short reset pulse is... Agent: Dickstein Shapiro LLP

20090072900 - Apparatus and method for compensating for nonlinearity in portable communication terminal: An apparatus and method for compensating for nonlinearity of a portable communication terminal are provided. The apparatus includes a modem for modulating Transmission (Tx) data, a Digital Pre-Distortion (DPD) mode controller for obtaining power level information and for determining a power on/off state of a DPD unit by using the... Agent: The Farrell Law Firm, P.C.

20090072901 - Power amplifier: A power amplifier of the present invention includes a distributor (76) for distributing an input signal; an anti-phase third-order intermodulation distortion generation circuit (63) for, upon receiving the input signal that was distributed by the distributor, generating third-order intermodulation distortion for which the phase difference is anti-phase with respect to... Agent: Young & Thompson

20090072902 - Low distortion class-d amplifier: An electronic class-D amplifier having an amplifier input to which an amplifier input signal may be applied, an amplifier output which may produce an amplifier output signal, an output switching stage, a pulse width modulator which includes an oscillator, wherein a first output of the oscillator produces a carrier reference... Agent: Brooks Kushman P.C.

20090072904 - Variable gain amplifier having dual gain control: An electronic amplifier circuit that provides improved gain control linearity characteristics resulting from having a controllable field effect transistor (FET) acting as a degeneration resistance (degeneration resistance FET) and a controllable load resistance FET. The overall gain function of the amplifier exhibits improved linearity in part due to the presence... Agent: Workman Nydegger 1000 Eagle Gate Tower

20090072903 - Variable gain amplifier having variable gain dc offset loop: A variable gain amplifier and offset cancellation loop circuit and methods for tracking and correcting DC offset errors that may vary in accordance with the gain of the variable gain amplifier. The circuit is designed to provide tracking of rapid changes in the offset error while maintaining a desired overall... Agent: Workman Nydegger 1000 Eagle Gate Tower

20090072905 - Variable gain amplifier having wide gain variation and wide bandwidth: There is provided a variable gain amplifier that is implemented with a CMOS device and has wide band variation and wide bandwidth by a predetermined exponential function. A variable gain amplifier having wide gain variation and wide bandwidth according to an aspect of the invention may include: a differential amplification... Agent: Lowe Hauptman Ham & Berner, LLP

20090072907 - Electric circuit: This invention provides an electric circuit which used a rectification type device in which an electric current is generated only in a single direction, when an electric potential difference was applied to electrodes at both ends of the device. Then, the invention provides an electric circuit which utilized a fact... Agent: Fish & Richardson P.C.

20090072906 - High frequency power amplifier circuit and electronic component for high frequency power amplifier: In a high frequency power amplifier circuit that supplies a bias to an amplifying FET by a current mirror method, scattering of a threshold voltage Vth due to the scattering of the channel impurity concentration of the FET, and a shift of a bias point caused by the scattering of... Agent: Mattingly, Stanger, Malur & Brundidge, P.C.

20090072908 - Gain control circuit and optical recording and reproducing device using thereof: A gain control circuit to determine gain by a current ratio of mutual conductance. The gain control circuit includes a first gain control circuit in which positive and negative phase input signals are supplied, gain is changed based on a first control signal, and positive and negative phase output signals... Agent: Sonnenschein Nath & Rosenthal LLP

20090072909 - Current mirror circuit: An all-NPN bipolar junction current mirror circuit for mirroring an input reference current is disclosed. The circuit includes an input stage for providing an input reference current to the current mirror circuit, a reference stage for mirroring the input reference current and an output stage electrically connected to the reference... Agent: Gardere Wynne Sewell LLP Intellectual Property Section

20090066411 - Method for designing input circuitry for transistor power amplifier: A circuit having: an input matching network; a transistor coupled to an output of the input matching network; and wherein the input matching network has a first input impedance when such input matching network is fed with an input signal having a relatively low power level and wherein the input... Agent: Raytheon Company C/o Daly, Crowley, Mofford & Durkee, LLP

20090066412 - Class-d amplifier circuit: A class-D amplifier circuit of one aspect includes a gain controller, a pulse-width modulator, an output driver, and a drive controller. The gain controller selectively amplifies an analog input signal according to a level control signal, and outputs a corresponding gain-adjusted analog input signal. The pulse-width modulator converts the gain-adjusted... Agent: Volentine & Whitt PLLC

20090066413 - Method and apparatus for diminishing mismatch effects between switched signals: A circuit for diminishing mismatch effects between at least two switched signals includes at least three processing circuits configured to receive at least two switched signals such that each of the switched signals is associated with one of the processing circuits leaving at least one unassociated processing circuit. A controller... Agent: Texas Instruments Incorporated

20090066414 - Gain control methods and systems in an amplifier assembly: A Variable Gain Amplifier (VGA) amplifies an input signal according to a gain, to produce an amplified signal. A detector module detects a power indicative of a power of the amplified signal. A comparator module compares the detected power to a high threshold, a low threshold and a target threshold... Agent: Sterne, Kessler, Goldstein & Fox P.l.l.c.

20090066415 - 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 between a first input signal input through a first... Agent: F. Chau & Associates, LLC

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 consumption current that is higher than... Agent: Morgan Lewis & Bockius LLP

20090066417 - High bandwidth apparatus and method for generating differential signals: An apparatus and method for generating differential signals. The apparatus includes a first operational amplifier receiving a first signal, a second operational amplifier receiving a second signal, and a first transistor. The first transistor includes a first gate, a first terminal, and a second terminal. Additionally, the apparatus includes a... Agent: Townsend And Townsend And Crew, LLP

20090066418 - Amplifier circuit and communication device: There is provided an amplifier circuit having a common-source amplifier, an output load connected to an output terminal of the common-source amplifier, a buffer circuit connected to the output terminal of the common-source amplifier, a feedback circuit connected between an output terminal of the buffer circuit and an input terminal... Agent: Arent Fox LLP

20090066419 - Variable gain amplifier circuits: A variable gain amplifier circuit has a variable gain amplifier (VGA), a string of resistors, a plurality of gain switches, a current source, and at least two current switches. A first input terminal of the VGA receives an input voltage signal. The string of resistors are coupled between an output... Agent: Thomas, Kayden, Horstemeyer & Risley, LLP

20090066420 - Solid state power amplifier with multi-planar mmic modules: A solid state power amplifier (SSPA) system may include a radio frequency (RF) input, an RF waveguide split block, multiple monolithic microwave integrated circuit (MMIC) power amplifier modules, and/or a heat spreader. An MMIC power amplifier module may include a backing, a board, at least one MMIC, and/or a cover.... Agent: Snell & Wilmer L.L.P. (main)

20090066421 - Internal frequency compensation circuit for integrated circuit controllers: A frequency compensation circuit internal to an integrated circuit which comprises a transconductance amplifier having a first input configured to receive a reference voltage, a second input configured to receive an input voltage and an input current, a first output configured to output a first output current and a second... Agent: Mcdermott Will & Emery LLP

20090066422 - Dynamically controlled output slew rate pad driver: Disclosed is a dynamically controlled, output slew rate pad driver that generates a controlled voltage on an interface node of an interface circuit, such as an input circuit, an output circuit, or a combined input/output circuit, to control the process of slewing the controlled voltage on the interface node. The... Agent: Cochran Freund & Young LLC

20090058519 - Variable automatic limit control (alc) threshold for any desired compression curve: A signal conditioning circuit dynamically adjusts a compression ratio, so as to compress a signal and avoid limiting to the extent possible, thereby avoiding distorting the signal by clipping. An input signal is applied to the input of a programmed gain amplifier (PGA) or other amplifier whose gain can be... Agent: Bromberg & Sunstein LLP

20090058520 - Amplifier circuit: An amplifier circuit that is less likely to cause an error in a gain and a DC offset voltage and is suitable for reducing a size and power consumption is offered. A first resistor and a second resistor are connected in series between an input terminal and an output terminal.... Agent: Morrison & Foerster LLP

20090058521 - System and method of digital linearization in electronic devices: A method, apparatus, and computer program product to reduce nonlinear signal distortion of a primary signal within an electronic device is provided. An example method includes the steps of: applying at least one stimulus signal to excite distortion; analyzing nonlinear effects in the distorted stimulus signal; modeling distortion as a... Agent: Agilent Technologies Inc.

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, and controls a channel current of the... Agent: Oliff & Berridge, PLC

20090058522 - Differential amplifier: A differential amplifier is constituted of first emitter-follower transistors, second emitter-follower transistors, and amplification transistors whose bases are alternately connected to the emitters of the second emitter-follower transistors and whose collectors are connected to the emitters of the first emitter-follower transistors, as well as emitter resistors and constant current sources,... Agent: Sughrue Mion, PLLC

20090058524 - Received signal strength indicator self-calibrating gain of limiter: A received signal strength indicator according to an aspect of the invention may include a gain calibration section including a calibration limiter, a calibration load unit and a comparison and adjustment unit. The calibration load unit is connected to output terminals of the calibration limiter, and generating an output differential... Agent: Lowe Hauptman Ham & Berner, LLP

20090058525 - Common-mode bandwidth reduction circuit and method for differential applications: An amplifier driver circuit (10) includes first (11-1) and second (11-2) feedback amplifiers including first (14-1) and second (14-2) upper current mirrors, respectively, and first (16-1) and second (16-2) lower current mirrors, respectively, first (12-1) and second (12-2) amplifier input stages receiving a common mode input signal, and first (18-1)... Agent: Texas Instruments Incorporated

20090058526 - Common mode feedback amplifier with switched differential capacitor: A structure and related design structure for providing a common mode feedback to a differential amplifier are disclosed. A common mode feedback amplifier is connected to a differential amplifier to provide common mode feedback voltage thereto. An input of the common mode feedback amplifier is shorted to an output terminal... Agent: Hoffman Warnick LLC

20090058527 - 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 into each of a pair of paths forming... Agent: Texas Instruments Incorporated

20090058528 - Pre-amplifier for a receiver and a method therefor: A pre-amplifier for a receiver is provided. The pre-amplifier includes a first and a second input operational amplifiers, an output module, a first and a second feedback circuits. The first and the second input operational amplifiers amplify an input differential voltage pair to output a first and a second differential... Agent: Thomas, Kayden, Horstemeyer & Risley, LLP

20090058529 - 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. The differential amplifier provides an amplified output signal with... Agent: Hamilton, Brook, Smith & Reynolds, P.C.

20090058530 - High-voltage transconductance circuit: The invention is a high-power transconductance circuit (HVTC) comprising three direct-coupled stages which can be substituted for a final-stage power-amplifying vacuum tube in an audio amplifier. The HVTC consists of an input stage, a driver stage, an output stage, and a power conditioner. The input to the HVTC is a... Agent: Robert E Malm

20090058531 - Variable gain amplifier: Techniques and systems for receiving a signal at a first component with an adjustable gain, and adjusting the gain of the first component to a first gain value using a first gain step. Amplifying the signal with the first gain value, generating a first amplified signal, and receiving the first... Agent: Fish & Richardson P.C.

20090058532 - Nitride semiconductor device, doherty amplifier and drain voltage controlled amplifier: A nitride semiconductor device includes a substrate, a stacked semiconductor structure formed over the substrate and including a electron channel layer of an undoped nitride semiconductor and an electron supplying layer of an n-type nitride semiconductor formed epitaxially over the electron channel layer, the n-type nitride semiconductor having an electron... Agent: Westerman, Hattori, Daniels & Adrian, LLP

20090058533 - Voltage generating apparatus and methods: The invention provides a voltage generating apparatus for powering at least one amplifier. The voltage generating apparatus comprises a voltage source, a switched capacitor voltage converter and a voltage detector. The voltage source supplies a first voltage to a positive voltage input terminal of the at least one amplifier. The... Agent: Birch Stewart Kolasch & Birch

20090058534 - Non-inverting amplifier circuit and optical switch driver circuit: A non-inverting amplifier circuit is disclosed that includes an operational amplifier and a preemphasis circuit connected between the operational amplifier and a signal source. The preemphasis circuit is configured to compensate for the internal delay of a load connected to the output of the operational amplifier by emphasizing a high-frequency... Agent: Staas & Halsey LLP