Amplifiers inventions 10/07

20070247217 - Systems and methods of rf power transmission, modulation, and amplification, including embodiments for amplifier class transitioning: Methods and systems for vector combining power amplification are disclosed herein. In one embodiment, a plurality of signals are individually amplified, then summed to form a desired time-varying complex envelope signal. Phase and/or frequency characteristics of one or more of the signals are controlled to provide the desired phase, frequency,... Agent: Sterne, Kessler, Goldstein & Fox P.l.l.c.

20070247218 - Dc offset cancellation apparatus: A DC offset canceling apparatus includes a main amplifier, a replica amplifier, a switch, and a storage unit. The replica amplifier has substantially the same structure as the main amplifier, receives an input signal having the same sign as that of a signal input to the main amplifier, and has... Agent: F. Chau & Associates, LLC

20070247221 - Systems and methods of rf power transmission, modulation and amplification, including embodiments for amplifier class transitioning: Methods and systems for vector combining power amplification are disclosed herein. In one embodiment, a plurality of signals are individually amplified, then summed to form a desired time-varying complex envelope signal. Phase and/or frequency characteristics of one or more of the signals are controlled to provide the desired phase, frequency,... Agent: Sterne, Kessler, Goldstein & Fox P.l.l.c.

20070247222 - Systems and methods of rf power transmission, modulation and amplification, including embodiments for amplifier class transitioning: Methods and systems for vector combining power amplification are disclosed herein. In one embodiment, a plurality of signals are individually amplified, then summed to form a desired time-varying complex envelope signal. Phase and/or frequency characteristics of one or more of the signals are controlled to provide the desired phase, frequency,... Agent: Sterne, Kessler, Goldstein & Fox P.l.l.c.

20070247220 - Systems and methods of rf power transmission, modulation, and amplification, including embodiments for amplifier class transitioning: Methods and systems for vector combining power amplification are disclosed herein. In one embodiment, a plurality of signals are individually amplified, then summed to form a desired time-varying complex envelope signal. Phase and/or frequency characteristics of one or more of the signals are controlled to provide the desired phase, frequency,... Agent: Sterne, Kessler, Goldstein & Fox P.l.l.c.

20070247223 - Class-d amplifier: A PWM circuit converts output data of a calculator to a pulse width modulation signal, and outputs it to a load (speaker) through a buffer amplifier and a low-pass filter. A digital low-pass filter has the same filter characteristic as a low-pass filter. An error calculator calculates the error Δ(z)... Agent: Pillsbury Winthrop Shaw Pittman LLP

20070247219 - Switching power amplifier: The present invention discloses a switching amplifier, comprising a modulator for converting a main input signal to a high frequency modulated switching signal and for providing voltage amplification of the main input signal. The present invention further includes a power output stage coupled with an output of the modulator for... Agent: Peter Ganjian

20070247224 - Sensor electronic: A sensor device includes a moveable object, at least one magnetically encoded region provided on the moveable object, at least one magnetic field detector adapted to detect a signal originating from the magnetically encoded region, and a sensor electronic adapted to perform automatic offset compensation.... Agent: Fay Kaplun & Marcin, LLP

20070247225 - Switching circuit of power converter having voltage-clipping device to improve efficiency: A switching circuit for power converters is presented. It includes a voltage-clipping device, a resistive device, a first transistor and a second transistor. The voltage-clipping device is coupled to an input voltage. The first transistor is connected in series with the voltage-clipping device for switching the input voltage. The second... Agent: J.c. Patents, Inc.

20070247226 - Circuit for correcting signal distortions: A corrector circuit for correcting second harmonic distortions is provided. The corrector circuit includes a transconductance circuit having an input transconductance with a transresistance load for receiving a distorted voltage signal having a second harmonic component. The transconductance circuit is adapted to generate a corrected voltage signal having the second... Agent: Graybeal Jackson Haley LLP Bryan A. Santarelli

20070247227 - Circuit and method for driving bulk capacitance of amplifier input transistors: Amplifier circuitry includes an input stage having a transconductance stage including first and second input transistors and a first tail current source, gates of the first and second input transistors being coupled to first and second input signals, respectively. A bulk electrode capacitance driver includes third and fourth input transistors... Agent: Texas Instruments Incorporated

20070247228 - Apparatus for receiver equalization: In some embodiments an apparatus includes an amplifier, a first inverter having an input coupled to an output of the amplifier, and a second inverter having an input coupled to an output of the first inverter and an output, where the output of the second inverter is fed back to... Agent: Blakely Sokoloff Taylor & Zafman

20070247229 - Apparatus, amplifier, system and method for receiver equalization: In some embodiments an apparatus includes an amplifier, a first inverter having an input coupled to an output of the amplifier, and a second inverter having an input coupled to an output of the first inverter and an output, where the output of the second inverter is fed back to... Agent: Blakely Sokoloff Taylor & Zafman

20070247230 - Gate leakage insensitive current mirror circuit: A gate leakage insensitive current mirror circuit including an input stage, an output stage, and a pair of complementary source followers. The pair of complementary source followers is connected between the input stage and the output stage. In operation, the input stage receives an input current and the pair of... Agent: Texas Instruments Incorporated

20070247231 - Dc-bias network for a distributed amplifier: Systems are disclosed for providing a DC-bias network for a RF distributed amplifier. One embodiment may include a DC-bias network comprising a planar substrate having an input port configured to receive a DC input signal and provide a DC bias at an output port, a microstrip line mounted to the... Agent: Tarolli, Sundheim, Covell & Tummino L.L.P.

20070247232 - Eer high frequency amplifier: An EER high frequency amplifier wherein the dynamic range of the gain can be widened by performing a predetermined control of a device in a high frequency amplifying part and thereby enhancing the isolation within the device. In an EER high frequency amplifier (1), an envelope detecting part (2) extracts... Agent: Stevens, Davis, Miller & Mosher, LLP

20070241812 - High efficiency linearization power amplifier for wireless communication: An embodiment of the invention uses a predistortion correction signal to combination the modulated RF signal by an analog multiplier for linearization of power amplifiers having nonlinear characteristics such as those used in wireless RF transmitters. A predistortion controller comprises a plurality of down converters for retrieving both the ideal... Agent: James E. Eakin

20070241813 - Amplifier circuit with automatic gain correction: The present invention relates to an amplifier circuit and system, and to a method of compensating a gain imbalance generated in a complementary amplifier stage with first and second amplifier means (22, 24) in a bridge configuration. A compensation offset current is generated in response to the values of input... Agent: Nxp, B.v. Nxp Intellectual Property Department

20070241814 - Amplifying device and radio communication circuit: There is provided with an amplifying device including: an input terminal configured to input an input signal; first to ith blocks including first to ith resonators having different first to ith resonance frequencies and first to ith amplifiers that amplify signals which have passed through the first to ith resonators;... Agent: Oblon, Spivak, Mcclelland, Maier & Neustadt, P.C.

20070241815 - Linearizer: A linearizer changes a gain characteristic to a valley characteristic in which a gain reduces and then increases. The linearizer includes: a signal path in which an RF signal input terminal (1), an input side bias blocking capacitor (4), a diode pair (8, 12) including diodes having opposite polarities to... Agent: Birch Stewart Kolasch & Birch

20070241816 - Signal extraction circuit and distortion-compensated amplifier incorporating the same: To cancel a reflected wave reflected from a connecting portion (22) and leaking into a feedback signal when a non-matched component is connected, the reflected wave is extracted by a circulator (30) and its phase and amplitude are adjusted by a vector adjusting circuit (32), and then the thus adjusted... Agent: Bingham Mccutchen LLP

20070241817 - Amplifier and driving circuit using the same: An amplifier in an embodiment of the present invention has MOS transistors connected serially between a power supply VDD and a ground terminal GND; an output terminal Vout connected to a node provided between the MOS transistors; a first mirror capacity provided between the gate of a MOS transistor and... Agent: Mcginn Intellectual Property Law Group, PLLC

20070241818 - Class ab folded cascode stage and method for low noise, low power, low-offset operational amplifier: A class AB folded cascode circuit includes a differential current follower having first and second cascode transistors with emitters connected to first and second input conductors. An input of a first current mirror is coupled to the first input conductor, and an input of a second current mirror is coupled... Agent: Texas Instruments Incorporated

20070241819 - Low-offset, wide common mode range, cascoded-gain single stage amplifier: The cascoded gain single stage amplifier includes: a common gate differential pair; a first amplifier having a first input coupled to a first leg of the differential pair, and a second input coupled to a second leg of the differential pair; a current mirror coupled to the differential pair; a... Agent: Texas Instruments Incorporated

20070241820 - Drive circuit containing amplifier circuit: An amplifier circuit includes an operational amplifier having first and second input nodes and one output node which is connected to a data line for which a pixel is provided; a feedback circuit having first and second elements which are connected to one of the first and second input nodes... Agent: Sughrue Mion, PLLC

20070241821 - Signaling system with low-power automatic gain control: An integrated circuit device includes a variable-gain amplifier, memory circuit and gain control update circuit. The variable-gain amplifier generates an amplified signal having an amplitude according to a gain control value that is stored, at least during a first interval, within the memory circuit. The update circuit generates an updated... Agent: Shemwell Mahamedi LLP

20070241822 - Chain-chopping current mirror and method for stabilizing output currents: A chain-chopping current mirror and a method for stabilizing output currents are disclosed. The current mirror includes multiple output nodes, a bias source unit, multiple current mirroring units and multiple switch components. The bias source unit provides a reference bias according to the received current. Each of the current mirroring... Agent: Jianq Chyun Intellectual Property Office

20070236285 - Full swing amplifying circuit and applications thereof: An amplifying circuit includes an input chopping circuit, an amplifier, and an output chopping circuit. The input chopping circuit is operably coupled to chop an input signal at a chopping rate to produce a chopped input signal. The amplifier has a first input transistor section, a second input transistor section,... Agent: Garlick Harrison & Markison

20070236286 - Pulse modulation type electric power amplifier: A pulse modulation type electric power amplifier includes a pulse modulator that receives as input a clock and an input signal, and converts the input signal to a pulse train, an output control circuit that receives as input the pulse train output by the pulse modulator, and controls output of... Agent: Hamre, Schumann, Mueller & Larson P.C.

20070236287 - Switching converter with several converter stages: the current measurement arrangement (12B, 12C) of the at least one second converter stage receives an adjustment signal (k2, k3), which is dependent on a proportionality factor between a current across the inductive storage element (11A) of the first switching converter (1A) and the current measuring signal (Is1) of the... Agent: Maginot, Moore & Beck Chase Tower

20070236288 - Apparatus for amplifying differential signal: An apparatus for amplifying differential signals is provided. The apparatus comprises a differential amplifier, a first impedance component, a second impedance component, a voltage source and a high-pass filter. The differential amplifier receives an input differential signal with a first terminal and a second terminal. The differential amplifier also drains... Agent: Jianq Chyun Intellectual Property Office

20070236289 - Differential amplifier, digital-to-analog converter and display device: Disclosed are a multi-level differential amplifier that includes first to third input terminals; an output terminal; first to third differential pairs; a current source circuit for supplying currents to the respective first to mth differential pairs; a load circuit connected to first and second nodes to which first and second... Agent: Sughrue Mion, PLLC

20070236290 - Amplifier circuit and gain control method thereof: An amplifier circuit is provided with a control section that respectively selectively supplies either a second voltage or a third voltage to gates of a plurality of second transistors and gates of a plurality of third transistors by respectively switching the connection states of a plurality of first switching elements... Agent: Oblon, Spivak, Mcclelland, Maier & Neustadt, P.C.

20070236291 - Class ab source follower: Various source follower circuits and methods for implementing such are disclosed. As one example, a class AB source follower circuit is disclosed that includes a source follower circuit that is actively biased. The dynamic biasing allows the source follower circuit to sustainably sink a DC current. In some instances of... Agent: Hamilton And Desanctis

20070236292 - Fast settling power amplifier regulator: A method and apparatus is provided for dynamically changing the biasing conditions of a voltage regulator to overcome the problems caused by various conditions. The invention includes a detector and a bias control circuit for applying bias current to the voltage regulator to compensate for a detected condition.... Agent: Johnson & Associates

20070236293 - High-frequency power amplifier and communication device: To provide a high-frequency power amplifier capable of improving the linearity and efficiency of a high-frequency power amplifier by stabilizing, at high frequencies, the bias voltage of a bias circuit featuring the temperature compensating effect of a high-frequency amplifying transistor, a capacitor 61 is connected between the base of a... Agent: Mcdermott Will & Emery LLP

20070236294 - Class l amplifier: A new Class L amplifier which dynamically switches between multiple pairs of power rails, and has the ability to select the most advantageous combination of rails for the minimization of power dissipation in the amplifier. A bridged amplifier system using two Class L amplifiers to drive a load.... Agent: Townsend And Townsend And Crew, LLP

20070236296 - Apparatus and method for preventing degradation of rf performance due to impedance change of antenna in mobile communication terminal: Disclosed are an apparatus and a method for preventing the degradation of RF performance due to a change in impedance of an antenna in a mobile communication terminal. The mobile communication terminal includes a plurality of impedance matching circuits and a controller of the mobile communication terminal is adapted to... Agent: The Farrell Law Firm, P.C.

20070236295 - Fm power amplifier with antenna power control: An RF power amplification system having a power amplifier, a matching network, and an antenna power controller which compares a voltage at the matching network output to a voltage at the matching network input and uses a result of that comparison to manipulate the power amplifier and/or the matching network,... Agent: Townsend And Townsend And Crew, LLP

20070229152 - Filter adjustment circuit: A filter adjustment circuit has a filter capable of adjusting a cut-off frequency that is composed of a plurality of integrators connected to each other, each of which has an amplifier, a resistor connected to an input of the amplifier, a capacitor connected between the input and the output of... Agent: Oblon, Spivak, Mcclelland, Maier & Neustadt, P.C.

20070229153 - Fet bias circuit: The present invention discloses an FET (Field Effect Transistor) bias circuit comprising a current-changing information circuit having a power source, a resistor connected to the signal output end of this circuit, the other end of the resistor connected to a reference voltage source, and the node between the resistor and... Agent: Matthias Scholl

20070229154 - Differential amplifier with active post-distortion linearization: A differential amplifier, which has good linearity and noise performance, includes a first side that includes first, second, third, and fourth transistors and an inductor. The first and second transistors are coupled as a first cascode pair, and the third and fourth transistors are coupled as a second cascode pair.... Agent: Qualcomm Incorporated

20070229155 - Feedback amplifier: A feedback architecture for a PWM switching audio amplifier is, capable of compensating the effects of the demodulation filter through at least two feedback paths of the voltage applied to a load without degrading the overall loop gain of the device. Each of the feedback paths may include a respective... Agent: Allen, Dyer, Doppelt, Milbrath & Gilchrist P.A.

20070229156 - Class ab folded cascode stage and method for low noise, low power, low-offset operational amplilier: An amplifier circuit includes an pair of input transistors, the drains of which are connected to emitters of first and second cascode transistors. First and second controlled current sources are connected to the emitters of the first and second cascode transistors, respectively, and third and fourth controlled current sources are... Agent: Texas Instruments Incorporated

20070229159 - Multi-mode class-d amplifiers: Multi-mode class-D amplifiers are disclosed. An example multi-mode class-D amplifier circuit having an analog input and a digital input disclosed herein comprises a single-mode class-D amplifier having an amplifier input, a smoothing filter having a filter input and a filter output, wherein the filter output is electronically coupled to the... Agent: Texas Instruments Incorporated

20070229157 - Circuit having enhanced input signal range: A circuit having an enhanced input signal range includes a differential amplifier operative to receive at least first and second signals and to amplify a difference between the first and second signals. The differential amplifier generates a difference signal at an output thereof which is a function of the difference... Agent: Ryan, Mason & Lewis, LLP

20070229158 - Wide-temperature integrated operational amplifier: The present invention relates to a reference current circuit. The reference circuit comprises a low-level current bias circuit, a voltage proportional-to-absolute temperature generator for creating a proportional-to-absolute temperature voltage (VPTAT), and a MOSFET-based constant-IC regulator circuit. The MOSFET-based constant-IC regulator circuit includes a constant-IC input and constant-IC output. The constant-IC... Agent: Tope-mckay & Associates

20070229160 - Control circuit for controlling a current and/or voltage of an electronic circuit: A control circuit is provided for controlling a current and/or voltage of an electronic circuit. The circuit comprises an input stage, which has at least one input, a supply voltage terminal, an amplifier element, and a subcircuit. The amplifier element comprises an operating current path and a control terminal. In... Agent: Mcgrath, Geissler, Olds & Richardson, PLLC

20070229161 - Voltage-to-current converter: Circuits and methods to achieve a voltage-to-current converter having low noise and a high linearity are disclosed. In a preferred embodiment the converter has been used as a Gm integrator. The core of the invention is an operational transconductance amplifier (OTA) having additional DC current sources allowing a common mode... Agent: Stephen B. Ackerman

20070229162 - Electronic circuit: An electronic circuit includes an input terminal, a transimpedance amplifier connected to the input terminal and including an amplifier and a feedback resistor, a first time constant circuit smoothing an output from the transimpedance amplifier, a gain control circuit arranged between the input terminal and ground potential and controlling current... Agent: Westerman, Hattori, Daniels & Adrian, LLP

20070229164 - Low noise amplifier and low noise amplifying method: A low noise amplifier for operating in response to different gain modes is disclosed. The low noise amplifier includes a voltage adjusting circuit, which provides a first bias voltage at a first gain mode and provides a second bias voltage at a second gain mode, where the second bias voltage... Agent: North America Intellectual Property Corporation

20070229163 - Plop noise avoidance for an amplifier: The invention concerns a method and signal conversion device for avoiding undesirable noise in the start up of an amplifying device, as well as to an amplifying device including such a signal conversion device. The signal conversion device (12) comprises a variable gain providing unit (Q3, Q4, Q5, Q6), a... Agent: Nxp, B.v. Nxp Intellectual Property Department

20070229165 - Integrated parallel power amplifier: A parallel power amplifier includes a carrier amplifier and peak amplifier coupled to receive signals from a quadrature hybrid made up of slab inductors in an integrated circuit. The slab inductors may be on different layers in the integrated circuit and may have similar or dissimilar shapes.... Agent: Lemoine Patent Service, LLC C/o Portfolioip

20070229166 - Buffered cascode current mirror: An embodiment to mirror current having a pair of current mirroring transistors and a pair of cascode transistors coupled to the current mirror transistors, and furthermore having an amplifier to provide an offset voltage between the drain of a cascode transistor and the gate of a current mirror transistor, where... Agent: Joseph Shor

20070229167 - Bias circuitry for cascode transistor circuit: An integrated circuit includes a composite transistor including at least a first transistor of a first technology type having a first group of intrinsic properties and a second transistor of a second technology type having a second group of the intrinsic properties, at least one of the intrinsic properties of... Agent: Texas Instruments Incorporated

20070229169 - Single supply direct drive amplifier: A driver amplifier operative from a single DC voltage supply, coupled directly to the output load without the need for DC coupling capacitors used for preventing DC reaching the output load. An onboard power supply generates a negative voltage rail that powers the output amplifiers, allowing driver amplifier operation from... Agent: Perkins Coie LLP

20070229168 - Wideband high frequency chokes: An n-stage RF choke comprises a series connection of two or more inductors connected in series between a source and a load. The inductor closest to the source has the largest inductance and the inductance closest to the load has the smallest inductance. The inductances of any inductors between the... Agent: Eugene S. Indyk

20070229170 - High-frequency power amplifier device: A high-frequency power amplifier device including: a power amplifier circuit which amplifies a high-frequency signal; an output matching circuit connected to an output side of the power amplifier circuit; and a high-frequency circuit connected to an output side of the output matching circuit, which is designed so that X[f] satisfies... Agent: Mcdermott Will & Emery LLP

20070229171 - Wireless transmitter having multiple programmable gain amplifiers (pgas) with tuned impedance to provide substantially linear response: A method and apparatus are provided for enabling a transmitter to have a substantially linear magnitude response and a substantially linear phase response. The transmitter includes first and second programmable gain amplifiers (PGAs). The first PGA is tuned to have a resonant frequency that is less than an operating frequency... Agent: Sterne, Kessler, Goldstein & Fox P.l.l.c.

20070229172 - Electronic circuit: An electronic circuit includes: a control circuit that controls the gain of a transimpedance amplifier by taking part of an input current to be input to the transimpedance amplifier, based on the output voltage of the transimpedance amplifier; and a PIN diode that is provided between an input of the... Agent: Westerman, Hattori, Daniels & Adrian, LLP