Amplifiers inventions 05/09

20090134940 - Balanced amplifier and electronic circuit: A balanced amplifier (1) is provided with: a first operational amplifier (11) whose reverse-phase input terminal is connected to an input voltage source (30) and whose reverse-phase input terminal is connected to an output terminal of the first operational amplifier; a second operational amplifier (12) whose positive-phase input terminal is... Agent: Young & Thompson

20090134941 - Negative resistance input amplifier circuit and oscillation circuit: The present invention provides a negative resistance input amplifier including: a microstrip line having one end connected to a collector of a transistor and the other end being open with a length of ¼ of a wavelength λ at a predetermined frequency f; and a microstrip line having one end... Agent: Reed Smith LLP

20090134942 - Radio frequency amplifier with constant gain setting: Radio frequency amplifier with constant gain setting. A circuitry that includes triple well connected MOSFETs is employed to eliminate body effects therein. The voltage gain as presented herein, being implemented using a ratio of certain elements within the circuitry, is immune to variations in temperature, power supply voltage, and process... Agent: Garlick Harrison & Markison

20090128232 - Switched-capacitor amplifier with improved reset phase: A switch-capacitor (“SC”) amplifier includes a two-stage operational amplifier (“OP-AMP”), an input SC network, and a feedback SC network. The two-stage OP-AMP includes a first OP-AMP stage having an output coupled to an input of a second OP-AMP stage. The input SC network is coupled to an input of the... Agent: Blakely Sokoloff Taylor & Zafman LLP

20090128233 - Shared linearity maintenance in power amplifiers: In some embodiments, a circuit includes a power amplifier including an input terminal configured to receive an input signal and an output terminal to provide an RF voltage, the output terminal coupled to a load, a current sensor configured to sense the current drawn by the power amplifier and provide... Agent: Infineon Technologies Ag Patent Department

20090128234 - Two-peak-power-level control method and device for a pulse-mode amplifier:

20090128235 - Power save mode for audio interface drive amplifier: An apparatus includes a data processor coupled with a memory that stores a program executable by the data processor; an accessory interface readably coupled with the data processor and an amplifier having an output coupled to the accessory interface and a program input coupled to the data processor. The amplifier... Agent: Harrington & Smith, PC

20090128236 - High efficiency amplification: A radio frequency amplification stage comprising: an amplifier for receiving an input signal to be amplified and a power supply voltage; and a power supply voltage stage for supplying said power supply voltage, comprising: means for providing a reference signal representing the envelope of the input signal; means for selecting... Agent: Novak Druce Deluca + Quigg LLP

20090128237 - Switching amplifiers: Systems and methods implemented in a switching amplifier for providing consistent, matching switching between top and bottom switching devices in a switching amplifier. One embodiment includes a half-bridge circuit output stage, a driver stage and a transformer. The driver stage, which drives the switches of the output stage, is very... Agent: Fliesler Meyer LLP

20090128238 - Offset cancellation of a single-ended operational amplifier: A single-ended operational amplifier includes an output stage, a first transconductance amplifier and a second transconductance amplifier. In an offset cancellation mode, two inputs of the first transconductance amplifier are supplied with a reference voltage to sink two currents from two inputs of the output stage respectively, the output stage... Agent: Rosenberg, Klein & Lee

20090128239 - Multistage tuning-tolerant equalizer filter with improved detection mechanisms for lower and higher frequency gain loops: The present invention provides an equalizer filter for compensating a received distorted signal for frequency dependent signal modifications introduced by a transmission channel, the received signal having an amplitude. The filter comprises at least one amplifying compensation stage having a gain and a saturation level, at least one limiting amplifier,... Agent: Bacon & Thomas, PLLC

20090121788 - System and method for self-cancellation of nth-order intermodulation products: A method for reducing distortion in a nonlinear device whereby nth-order intermodulation products are canceled. A test signal is applied to the input of the nonlinear device and amplitudes of nth- and mth-order intermodulation products are measured. Transfer function coefficients and an optimum value of a baseband resistance are calculated.... Agent: Fitzpatrick Cella Harper & Scinto

20090121789 - Device comprising a feedback-less gain controlled amplifier: Devices (1,2) comprising feedback-less amplifiers (16,19,26,29) that are gain controlled introduce linear relationships between output signals and input signals of the feedback—less amplifiers (16,19,26,29) by providing the feedback—less amplifiers (16,19,26,29) sub-circuits in the form of first transistors (33) operated in their triode regions for receiving input signals and second sub-circuits... Agent: Docket Clerk

20090121790 - System and method for signal level detection: An electronic signal level detection system and method are provided. The method receives an analog input signal having a variable voltage and compares the input signal voltage to a threshold. A detection signal is generated for input signal voltages exceeding the threshold in a periodic first time frame. In a... Agent: Gerald W. Maliszewski

20090121791 - Wideband low noise amplifiers: A wideband low noise amplifier. The wideband low noise amplifier comprises an amplifier, an output device, and an inductor. The amplifier amplifies an input signal received from an input node, and outputs the amplified signal to an output node. The output device is coupled to a first voltage and the... Agent: Quintero Law Office, PC

20090115507 - Method of and apparatus for reducing settling time of a switched capacitor amplifier: A method and apparatus for reducing settling time of a switched capacitor amplifier. The method includes disconnecting first and second capacitors from an amplifier. When the first and second capacitors are disconnected from the amplifier, they are charged by respective first and second input signals. The apparatus includes a plurality... Agent: Ratnerprestia

20090115510 - Device for amplifying a voltage representing an audiophonic information: The invention concerns a device (10) for amplifying a voltage (Ve) representing a sound amplifying information derived for a source (12) for driving a load (14), the device comprising a class D amplifying chain (16) adapted to deliver at least one load driving amplified electric signal (Vs) based on the... Agent: Young & Thompson

20090115508 - Switching amplifier and its modulation process: The present invention discloses a switching amplifier and its modulations process, which belongs to the field of non-filters-type switching amplifier. The switching amplifier comprises; pulse-width modulation with dual comparator, multiple-loop feedback structure, only one integrating amplifier with dual-ends output needed for each loop, no less than two feedback loops set... Agent: Dickstein Shapiro LLP

20090115509 - Systems and methods for isolating an analog signal: An accurate linear equivalent of an analog signal may be produced across an isolation barrier by driving a primary transformer winding with a drive amplifier and compensation amplifier, where the compensation operational amplifier amplifies a difference between a signal produced on a sense winding of the transformer and a combination... Agent: Cook Alex Ltd

20090115511 - Audio amplifier: An audio amplifier is provided. The audio amplifier includes an amplifier, a biasing circuit, and a time-delay circuit. The amplifier circuit is for amplifying audio signals. The biasing circuit is for providing a bias voltage to the amplifier circuit to actuate the amplifier circuit. The time-delay circuit is for receiving... Agent: PCe Industry, Inc. Att. Steven Reiss

20090115512 - Distributed doherty amplifiers: Doherty and distributed amplifier (DA) designs are combined to achieve, wideband amplifiers with high efficiency dynamic range. A modified Doherty amplifier includes a wideband phase shifter providing first and second outputs, a main amplifier coupled to the first output, an auxiliary amplifier coupled to the second output, and a wideband... Agent: Snell & Wilmer L.L.P. (main)

20090115513 - Predistorter: The invention aims to converge predistortion coefficients efficiently in a predistorter adapted to compensate for distortion generated in an amplifier. Level detection means (11) detects the level of a signal input to an amplifier (4). Signal acquisition means (5-7) acquire a signal output from the amplifier as a feedback signal.... Agent: Wenderoth, Lind & Ponack, L.L.P.

20090115514 - Class d amplifier: A class D amplifier includes: an amplifier that generates a digital signal for driving a load based on an input signal; an attenuator that attenuates the input signal according to an attenuation command signal; and a clip prevention controller that outputs the attenuation command signal to intermittently attenuate the input... Agent: Pillsbury Winthrop Shaw Pittman LLP

20090115515 - Receiver comprising an amplifier: The invention relates to a receiver (1) comprising an amplifier (31-34) for amplifying an antenna signal, which amplifier (31-34) comprises an amplifier input (11a) and an amplifier output (12a,12b), the amplifier input (11a) being a single ended input for receiving the antenna signal, the amplifier output (12a, 12b) being a... Agent: Nxp, B.v. Nxp Intellectual Property Department

20090115517 - Apparatus and method for low power rail-to-rail operational amplifier: A rail-to-rail amplifier is provided. The rail-to-rail amplifier includes a p-type differential pair, an n-type differential pair, switches, and an output stage. The switches are arranged to selectively couple either the p-type differential pair or the n-type differential pair to the output stage so that only one of the differential... Agent: Darby/national Semiconductor Corporation C/o Darby & Darby P.C.

20090115518 - Differential amplifier with input stage inverting common-mode signals: To eliminate common-mode components in differential input signals without the necessity of introducing a transformer and a special feedback loop for eliminating common-mode components, a differential amplifier (1) comprises a first input stage (11) for receiving differential input signals comprising common-mode signals and for outputting first differential intermediate signals, a... Agent: Nxp, B.v. Nxp Intellectual Property Department

20090115516 - Nauta operational transconductance amplifier: Provided is an operational transconductance amplifier (OTA). An existing Nauta transconductor used to implement a high frequency Gm-C filter integrated circuit (IC) is analyzed by a new method and from a new perspective to remove extra components and divide roles of remaining inverters for more simple and efficient circuit structure.... Agent: Rabin & Berdo, PC

20090115519 - Power amplifier and its idling current setting circuit: An idling current setting circuit (3) includes: current setting transistors (Q3, Q4) connected to output transistors (Q1, Q2) in a driver (2) in current mirror form; a plurality of current setting resistors (R1 to R4); and a plurality of switches (ASW1 to ASW4) for switching to any of the current... Agent: Connolly Bove Lodge & Hutz LLP

20090115520 - Temperature compensation of collector-voltage control rf amplifiers: A temperature compensation system for compensating a collector-voltage controlled RF amplifier. To overcome variation that occurs with temperature which can result in signal degradation of the adjacent channel spectrum, a temperature compensated current is utilized to create an offset signal. The offset signal is processed in connection with a control... Agent: Weide & Miller, Ltd.

20090115521 - High cmr amplifier topology: An amplifier topology includes an input stage comprising a differential pair which conducts respective output currents in response to a differential input signal. Bias current sources provide the pair's tail current and respective bias currents for the input stage in response to a drive voltage. After flowing through the input... Agent: Koppel, Patrick, Heybl & Dawson

20090115522 - Low power, low noise amplifier system: A low power, low noise amplifier system includes at least one amplifier having first and second differential input terminals, first and second differential output terminals and providing a differential output; first and second input capacitors interconnected with the first and second differential amplifier input terminals; first and second feedback circuits... Agent: Iandiorio Teska & Coleman Intellectual Property Law Attorneys

20090115523 - Discrete time amplifier circuit and analog-digital converter: The present invention is intended to attain simplified circuit configuration and low current consumption in a discrete time amplifier circuit and an AD converter, to improve the convergence from the transient response state to the steady state of the amplifier circuit and to reduce noise and distortion owing to the... Agent: Hamre, Schumann, Mueller & Larson P.C.

20090115524 - Output stage circuit and operational amplifier thereof: The present invention relates to an output stage circuit and an operational amplifier thereof. In the output stage circuit, one of a gate of a transistor is coupled to a gate of a bias transistor and a level shifter in response to a small signal outputted from an amplifying circuit... Agent: Muncy, Geissler, Olds & Lowe, PLLC

20090115526 - Fet bias circuit: A FET bias circuit applies a bias voltage that is not adjusted separately to an amplifying element FET of a FET amplifying circuit. In the FET bias circuit is provided a monitor element FET m having a gate connected to the gate of the amplifying element FET a and a... Agent: Cantor Colburn, LLP

20090115525 - Frequency tunable low noise amplifier: A frequency tunable low noise amplifier 100 providing multi-band operation includes an amplifier 110 and a frequency tunable input matching network 130 including at least one varactor 141, 142 coupled to an input of the amplifier 110. The input network receives a signal from a signal source 160. The input... Agent: Akerman Senterfitt

20090115527 - Output stage circuit and operational amplifier thereof: The present invention relates to an output stage circuit and an operational amplifier thereof. In the output stage circuit, one of a gate of a transistor is coupled to a gate of a bias transistor and a level shifter in response to a small signal outputted from an amplifying circuit... Agent: Muncy, Geissler, Olds & Lowe, PLLC

20090115528 - Low cost high performance power amplifier utilizing two-stage-included local negative feedback with feedback-shifting technology: The present invention provides a cost-effective and power-effective solution to a high performance amplifier design over conventional Class A and Class B/AB amplifiers. Without increasing cost or losing simplification of conventional Class B/AB amplifier configuration, two kinds of unique local feedback loops, which cover the second and third stages and... Agent: Zhenwu Wang

20090115530 - Doherty-amplifier system: A Doherty-amplifier system has several amplifier stages, of which the inputs are controlled via a control unit with different phase angles and/or signal amplitudes of an input signal. According to the invention, every output of every amplifier stage is connected directly to an antenna element, without the output signals from... Agent: Marshall, Gerstein & Borun LLP

20090115529 - Power amplifier having input ends combined in series and output ends combined in series: A power amplifier includes a first transformer, a first transistor, a first resistor, a second transformer, a second transistor, a second resistor, and a bias circuit. The first transformer drives the first transistor. The second transformer drives the second transistor. The first transformer is connected in series with the second... Agent: Schmeiser Olsen & Watts

20090115531 - Efficient power amplifier: A dynamic power supply for N amplifiers includes first and second power boost circuits which temporarily boost the positive or negative power supply rail, respectively. A control circuit monitors amplifier output signal levels and provides power boost control signals to the power boost circuits, which temporarily raise the positive supply... Agent: Irell & Manella LLP

20090115532 - Image signal amplifying circuit and amplifying semiconductor integrated circuit: An image signal amplifying circuit comprises: an amplifier circuit for amplifying an image signal; an output capacitor and a resistance, both being serially connected between an output node of the amplifier circuit and an output terminal; and a second-order high pass filter having a value of Q larger than one,... Agent: Frishauf, Holtz, Goodman & Chick, PC