Amplifiers inventions 10/09

20090256630 - Method of power amplifier predistortion adaptation using compression detection: A method of power amplifier predistortion that makes use of a compression detector circuit in a feedback loop in order to adapt the channel gain for changing transmitter behavior. By monitoring the compression behavior of the amplifier, the signal is scaled to compensate for gain and compression point variations in... Agent: Docket Clerk

20090256632 - Method and apparatus for reducing frequency memory effects in rf power amplifiers: The present invention relates to a predistorter for reducing memory effects in RF power amplifiers. The invention also relates to a method for reducing memory effects in RF power amplifiers and to a base station including such a predistorter. A predistorter according to the invention includes first means (1) for... Agent: Rothwell, Figg, Ernst & Manbeck, P.C.

20090256631 - Providing pre-distortion to an input signal: In one implementation, the present invention includes a diode device to receive an incoming radio frequency (RF) signal to be amplified in a gain device of an amplifier and to provide a pre-distorted signal. Based on this pre-distorted signal, the gain device can output an amplified RF signal having substantial... Agent: Trop, Pruner & Hu, P.C.

20090256633 - Bypass device for microwave amplifier unit: The invention relates to a bypass device for a microwave amplifier unit, the microwave amplifier unit (1) comprising at least one low noise amplifier (LNA) and amplifying communication signals in at least one microwave frequency band above 500 MHz, the bypass device extending in parallel to said microwave amplifier unit... Agent: Myers Andras Sherman LLP

20090256634 - Output distortion cancellation circuit: An output distortion circuit includes a first transistor arrangement receiving a nonlinear current associated with a nonlinear differential error signal. The first transistor arrangement produces a reflected base current that is applied to one side of a differential input pair. A second transistor arrangement eliminates the nonlinear differential error signal... Agent: Kenyon & Kenyon LLP

20090256636 - Amplifier arrangement and method for signal amplification: An amplifier arrangement comprises a signal input (Iin+, Iin−) to receive a signal to be amplified, a signal output (Out) to provide an amplified signal, an amplifier stage (AS) coupled between the signal input (Iin+, Iin−) and the signal output (Out), a switchable dynamic biasing stage (DB) with an input... Agent: Cohen, Pontani, Lieberman & Pavane LLP

20090256635 - Linear-in-db variable gain amplifier: A variable gain amplifier (VGA) with a gain thereof exponential to a control voltage thereof. The variable gain amplifier (VGA) comprises an exponential DC converter, and a linear voltage multiplier. The exponential DC converter receives the control voltage and generates an exponential voltage which is exponential to the control voltage.... Agent: Thomas, Kayden, Horstemeyer & Risley, LLP

20090256637 - High-frequency power amplifier and communication device: It is an object of the present invention to provide a high-frequency power amplifier capable of improving the linearity at the time of high output by preventing decrease in power of bias supply transistor. The high-frequency power amplifier is a high-frequency power amplifier including high-frequency power amplifier transistors and connected... Agent: Greenblum & Bernstein, P.L.C

20090251209 - High frequency power amplifier: A high frequency power amplifier comprises: an amplifier that amplifies signals received from a first input terminal and outputs amplified signals to an output terminal; a bypass route that connects a second input terminal to the output terminal without passing through the amplifier; a capacitor having a first end connected... Agent: Leydig Voit & Mayer, Ltd

20090251210 - Method and system for gain control and power saving in broadband feedback low-noise amplifiers: Methods and systems for gain control and power saving in broadband feedback low-noise amplifiers are disclosed and may include selectively enabling one or more of a subset and all of plurality of gain stages in the low noise amplifier. A feedback resistance coupled across the plurality of gain stages may... Agent: Mcandrews Held & Malloy, Ltd

20090251211 - Feedforward linearization of rf power amplifiers: RF amplifier system (200) incorporating feedforward linearization. The system includes a digital waveform source (202) generating digital data s(t) representative of at least one analog signal. The system also includes a feedforward linearization circuit for reducing a distortion of an RF power amplifier (212). The feedforward linearization circuit includes a... Agent: Harris Corporation C/o Darby & Darby PC

20090251212 - Switching amplifier: An amplifier having at least one switch controlled by an output voltage of a hysteresis block, wherein the hysteresis block is adapted to receive an input voltage signal based on an integration of an error signal, a low threshold voltage and a high threshold voltage, and is arranged to change... Agent: Stmicroelectronics Inc. C/o Wolf, Greenfield & Sacks, P.C.

20090251213 - Method for adjusting threshold voltage and circuit therefor: A method and circuit for changing a threshold voltage of a transistor. The circuit includes a sense circuit coupled to a switching transistor, a circuit transistor and to one terminal of a resistor. The other terminal of the resistor is connected to a body contact. The switching transistor directs current... Agent: Semiconductor Components Industries, LLC Intellectual Property Dept. - A700

20090251214 - Rail-to-rail operational amplifier: A rail-to-rail operational amplifier has a pair of input terminals and an output terminal, and includes first and second parallel-connected differential input stages configured to generate a differential output signal OUTN, OUTP in response to a differential input signal VINN, VINP received at the pair of input terminals. Each of... Agent: Townsend And Townsend And Crew, LLP

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 quiescent current. The drive signal to each... Agent: Merchant & Gould PC

20090251216 - Common mode control circuitry for multi-stage operational amplifiers: This disclosure relates to a common mode regulation in multi stage differential amplifiers.... Agent: Spryip, LLC Ifx

20090251217 - Amplifier design with biasing and power control aspects: Techniques for biasing an amplifier using a replica circuit are disclosed. In an embodiment, a replica circuit having substantially the same topology and sizing as a push-pull amplifier circuit is coupled to a main push-pull amplifier circuit. A transistor in the replica circuit may be biased using feedback to generate... Agent: Qualcomm Incorporated

20090251218 - Variable gain amplifier: A variable gain amplifier for amplifying an amplifier input signal includes a current steering transconductance stage and an impedance transformation network configured to match the current steering transconductance stage to the amplifier output. The impedance transformation network includes a tapped inductor, wherein a first inductive portion of the tapped inductor... Agent: Slater & Matsil LLP

20090251219 - Amplifier arrangement and signal generation method: An amplifier arrangement includes an output amplifier stage (OA) comprising a stage input (SIN), a stage output (SOUT) which is coupled to a signal output (OUT) of the amplifier arrangement, and a capacitive element (CE) which couples the stage output (SOUT) to the stage input (SIN). A driver stage (DR)... Agent: Cohen, Pontani, Lieberman & Pavane LLP

20090251220 - Radio-frequency power amplifier: A bias circuit operable to supply a bias current to a first transistor includes: a second transistor having a collector terminal connected to a first power supply; a first resistance element having one end connected to an emitter terminal of the second transistor and having the other end connected to... Agent: Mcdermott Will & Emery LLP

20090251222 - Linear high powered integrated circuit amplifier: A linear high powered integrated circuit amplifier includes a plurality of power amplifiers, balanced integrated circuit coupling, and a combining circuit. The balanced integrated circuit coupling couples a signal to the plurality of power amplifiers to the up-conversion module such that the power amplifiers amplify the signal to produce a... Agent: Garlick Harrison & Markison

20090251221 - Radio frequency front-end circuit: A radio frequency (RF) front end circuit includes a transformer coupled to a switch. The transformer converts a balanced transmit signal to an unbalanced transmit signal and converts an unbalanced receive signal to a balanced receive signal. The switch is configured to operate in first and second states. In the... Agent: Stmicroelectronics, Inc.

20090243717 - Compact high-speed modulator driver method and apparatus: Modulator driver for driving an electro-optical modulator in a high-speed optical communications system. In accordance with aspects of the present invention, a modulator driver is presented comprising an input differential limiting amplifier which is coupled to a distributed differential current-switch configuration, where one set of outputs of the distributed differential... Agent: Kitel Technologies LLC

20090243718 - High-speed modulator driver circuit with enhanced drive capability: Modulator driver for driving an electro-optical modulator in a high-speed optical communications system. In accordance with aspects of the present invention, a modulator driver is presented comprising an input differential limiting amplifier providing differential outputs coupled to a distributed enhanced drive output stage configuration, wherein said distributed enhanced drive output... Agent: Kitel Technologies LLC

20090243719 - Broadband amplifying device: d

20090243720 - Amplifiers with negative capacitance circuits: Provided herein are amplifiers including negative capacitance circuits for reducing distortion resulting from a gate-source (or base-emitter) capacitance of output stages of such amplifiers. Such a negative capacitance circuit is connected in parallel with the gate-source (or base-emitter) capacitance of the output stage to shunt the gate-source (or base-emitter) capacitance... Agent: Fliesler Meyer LLP

20090243721 - Feedforward amplifier circuit and method for controlling a feedforward amplifier circuit: A feedforward amplifier circuit includes a controllable error signal subtraction module (CESSM). The CESSM has a module signal input, an error cancellation input, a module control input and a circuit output. The module signal input of the CESSM is coupled to a power amplifier via a coupler and delay circuit.... Agent: Motorola, Inc.

20090243722 - Reduction of power consumption and emi of a switching amplifier: A switching amplifier has a network including current sources and resistors connected to the two output terminals of the H-bridge of the switching amplifier, to provide a small current to the load connected between the two output terminals at zero input, whereby the common mode voltage bouncing is reduced and... Agent: Rosenberg, Klein & Lee

20090243723 - Differential and symmetrical current source: A controlled, symmetrical, stable current source that can power floating resistive loads, eliminates the need to connect the load directly to either a power supply or ground and protects the load against overpower should either or both sides of the load be shorted to ground. The current source includes two... Agent: The Maxham Firm

20090243724 - Third order derivative distortion cancellation for ultra low power applications: An apparatus and method for the cancellation of third order derivative distortion for ultra low power (ULP) applications are disclosed involving a first amplifier connected in parallel with a second amplifier for amplifying a received signal. The first amplifier includes at least one transistor operating in the sub-threshold region such... Agent: Medtronic, Inc.

20090243725 - Semiconductor device: A semiconductor device includes a first transistor unit including first field effect transistors with first gate electrodes electrically connected together, first sources electrically connected together, and first drains electrically connected together, the first gate electrodes being electrically connected to the first drains, a second transistor unit including second field effect... Agent: Oblon, Spivak, Mcclelland Maier & Neustadt, P.C.

20090243726 - Variable resistor array and amplifier circuit: A variable resistor array adapted to make a resistance value between a first terminal and a second terminal variable, includes a plurality of resistors connected in series, first through nth MOS transistors selectively connected to the resistors, and first through nth switches having one input terminal connected to the source... Agent: Oliff & Berridge, PLC

20090243727 - Compensating for non-linear capacitance effects in a power amplifier: In one implementation, a power amplifier may include a gain device to receive an input signal and to output an amplified signal, and a compensation device coupled to the gain device to compensate for a change in a capacitance of the gain device occurring due to a change in the... Agent: Trop, Pruner & Hu, P.C.

20090243728 - Splitter circuit: A splitter circuit improves isolation between output ports. The splitter circuit comprises input port 1, output port 2, output port 3, FET 6, FET 11 and an impedance circuit. FET 6 is provided between input port 1 and output port 2 and adapted to amplify a signal at input port... Agent: Mcginn Intellectual Property Law Group, PLLC

20090243729 - Controlling overload of a transimpedance amplifier in an optical transceiver: Briefly, in accordance with one or more embodiments, a transimpedance amplifier of an optical transceiver or the like has a feedback element in a feedback arrangement and is capable of receiving an electrical current from an optical-to-electrical converter to generate an output voltage in response to the electrical current. A... Agent: Cool Patent, P.C. C/o Cpa Global

20090243730 - Converting circuit for converting differential signal to single-ended signal: A converting circuit for converting differential signals to a single-ended signal. The converting circuit comprises a cascode amplifier comprising a first transistor and a second transistor, wherein the first transistor comprises a control terminal, a first terminal, and a second terminal, the control terminal to which one of the differential... Agent: Katten Muchin Rosenman LLP