Amplifiers inventions 05/08

20080122531 - Method and apparatus for rf input coupling for inductive output tubes and other emission gated devices: An input circuit of a microwave amplification tube achieves improved instantaneous bandwidth. By directly coupling the transmission line carrying a modulating radio frequency signal to a control grid, a low-Q input circuit is created that increases the fractional bandwidth of the system. A resonant cavity may be used to generate... Agent: O'melveny & Myers LLP Ip&t Calendar Department La-1118

20080122532 - Amplifier device: An amplifier device has an input distributor block to which a radio-frequency input signal to be amplified can be fed via an input and that has a number of distributor elements connected in series. The input signal to be amplified is fed to the first distributor element as its input... Agent: Schiff Hardin, LLP Patent Department

20080122534 - Amplifier switching output stage with low distortion: A class-D audio amplifier switching output stage with reduced distortion including, application of damping to the power supply voltage nodes in the form for example of a low inductance damping snubber circuit including a first resistor in series with a second capacitor connected via a low inductance path between the... Agent: Nath & Associates

20080122533 - Circuit for reducing crosstalk: The circuit contains an input signal unit, an amplifier unit, and a comparator unit, cascaded in the foregoing order. The circuit further contains a ramp generator unit providing a ramp signal to the comparator unit. In one embodiment of the present invention, at least one of the two links between... Agent: Leong C Lei

20080122535 - Methods for controlling power stage of power amplifier and related apparatuses: A controller of a power amplifier includes an oversampler for oversampling an incoming digital signal to generate an oversampled signal, a controlling module for generating a first control signal and a second control signal according to the oversampled signal, a PWM circuit for generating a first PWM signal according to... Agent: North America Intellectual Property Corporation

20080122537 - Operational amplifier circuit: a level shifter unit outputting a level shifted signal generated by level shifting of output signals of the first and second differential amplifier circuits, and an output circuit including complementary output transistors series being coupled between the high potential power supply and the low potential power supply and inputting the... Agent: Arent Fox LLP

20080122536 - Three-stage amplifier: The invention relates to an amplifier circuit provided with offset reduction and with a sufficiently high bandwidth, having two input stages of a first amplifier connected in parallel at the input terminals, wherein the first input stage is connected directly to the input terminals, and the second input stage is... Agent: Maginot, Moore & Beck Chase Tower

20080122538 - Wideband active balun circuit based on differential amplifier: Provided is a wideband active balun circuit based on a differential amplifier. The active balun circuit is configured to compensate for unbalance between two differential signals and can be applied to wideband systems, such as software defined radio (SDR) systems or ultra wideband (UWB) systems. Also, when signal unbalance is... Agent: Blakely Sokoloff Taylor & Zafman

20080122540 - Low-power variable gain amplifier: Provided is a low-power variable gain amplifier having a direct-current (DC) bias stabilizer. The low-power variable gain amplifier includes: a load block through which first and second load currents flow from a first source voltage; a first differential input signal source including a terminal connected to a second source voltage... Agent: Cantor Colburn, LLP

20080122539 - Signal amplification device: A signal amplification device which uses inexpensive standard CMOS and yet is capable of high-accuracy threshold setting. An offset voltage generator detects the direct-current level of an input signal, and generates a positive or negative offset voltage signal. A peak detector outputs, as a peak value, the positive offset voltage... Agent: Staas & Halsey LLP

20080122541 - Amplifier circuit: Amplifier circuit for amplifying an input signal, having a vertically integrated cascode that has a collector semiconductor region of a collector, adjacent to the collector semiconductor region, a first base semiconductor region of a first base, a second base semiconductor region of a second base, an intermediate base semiconductor region... Agent: Muncy, Geissler, Olds & Lowe, PLLC

20080122542 - Enhanced amplifier with auxiliary path bias modulation: An amplification unit comprising a signal splitter operable to split an input signal into a first signal and a second signal such that the two resulting signal portions are in quadrature, a main driver operable to create a third signal from the first signal, and a main amplifier operable to... Agent: Nortel Networks Limited

20080122543 - Switching power supply: Methods and systems for enhancing system efficiency in a power amplification, modulation, and transmission system are provided. Embodiments include determining output power characteristics of a selected modulation scheme to be employed in data transmission, determining a most probable output power point of operation for the selected modulation scheme based on... Agent: Sterne, Kessler, Goldstein & Fox P.l.l.c.

20080116970 - Detection circuit and detection method: A detection circuit includes a bias circuit configured to generate a first bias voltage and a second bias voltage. The detection circuit further includes a storage device configured to store a detection value corresponding to an amplitude of a radio frequency signal received at a detector input. A series connection... Agent: Eschweiler & Associates Llc

20080116972 - Amplifier driver: Exemplary techniques for implementing an amplifier suitable for RF amplification, such as a tuned class DE amplifier, are disclosed. One disclosed embodiment of a circuit for amplifying an RF signal includes a push-pull amplifier comprising a push transistor and a pull transistor. A first driver amplifier drives the push transistor... Agent: Wolf Greenfield & Sacks, P.c.

20080116971 - Amplifying pusles of different duty cycles: An amplifier stage capable of delivering a peak limited voltage pulse with sharp transitions, at a desired width and duty cycle, and with high efficiency is disclosed. One disclosed embodiment relates to a circuit that includes a tuned class D amplifier that receives an input signal and generates a pulsed... Agent: Wolf Greenfield & Sacks, P.c.

20080116973 - Distributed multi-stage amplifier: Exemplary techniques for implementing an amplifier suitable for RF amplification, such as a tuned class DE amplifier, are disclosed. One disclosed embodiment of a circuit for amplifying an RF signal includes a push-pull amplifier comprising a push transistor and a pull transistor. A first driver amplifier drives the push transistor... Agent: Wolf Greenfield & Sacks, P.c.

20080116974 - Pulse amplifier: An amplifier stage capable of delivering a peak limited voltage pulse with sharp transitions, at a desired width and duty cycle, and with high efficiency is disclosed. One disclosed embodiment relates to a circuit that includes a tuned class D amplifier that receives an input signal and generates a pulsed... Agent: Wolf Greenfield & Sacks, P.c.

20080116975 - Class ab differential current conveyor input stage for a fully differential current feedback amplifier: Disclosed herein is technology for, among other things, a current feedback fully differential amplifier. The amplifier includes an input stage operable to sense an input current at a first terminal and a second terminal. The input stage includes a first buffer having an input coupled with the first terminal and... Agent: Wagner, Murabito & Hao LLP

20080116976 - Low noise amplifier with multiple inputs and multiple outputs: Satellite set-top boxes (STB) are increasingly being designed with multiple tuners, making them capable of receiving more than one program at a time. In addition, satellite STBs are increasingly being designed with multiple inputs, to permit reception of additional channels that will not fit within the conventional satellite intermediate frequency... Agent: Sterne, Kessler, Goldstein & Fox P.l.l.c.

20080116977 - Voltage supply insensitive bias circuits: A voltage-insensitive circuit includes a second circuit, and a biasing means for providing a constant bias current to the second circuit, the bias current being insensitive to power fluctuations of the voltage-insensitive circuit.... Agent: Kathy Manke Avago Technologies Limited

20080116978 - Audio amplifier driven by single voltage source and related voltage supply circuit: After coupling a first voltage source to a voltage supply circuit, a second voltage source having a same electrical level but an opposite electrical pole with said first voltage source is generated. An audio amplifier is then driven by both the first voltage source and the second voltage source, where... Agent: North America Intellectual Property Corporation

20080116979 - Amplifier circuit and methods of operation thereof: A signal amplifying circuit and associated methods and apparatuses, the circuit comprising: a signal path extending from an input terminal to an output terminal, a gain controller arranged to control the gain applied along the signal path in response to a control signal; an output stage within the signal path... Agent: Dickstein Shapiro LLP

20080111618 - Dc offset cancellation circuit: A DC offset cancellation block is provided for canceling a DC offset in a signal path. The signal path may include an input and an output. The DC offset cancellation block may include an active integrator coupled between the input and the output to provide a negative feedback to the... Agent: Finnegan, Henderson, Farabow, Garrett & Dunner LLP

20080111621 - Amplifier circuit and method for reducing voltage and current noise: An amplifier circuit with current noise reduction employs first and second variable impedance devices between a signal source and an amplifier. A modulation frequency generator establishes a modulation frequency fmod to alter the first and second impedance values out of phase from one another at the modulation frequency so that... Agent: Diederiks & Whitelaw, Plc

20080111619 - Apparatus and method for controlling a common-mode voltage of switching amplifiers: The present invention also relates to a system and method for controlling a common-mode voltage and/or current of an H-bridge circuit, the system comprising a modulator for receiving an input signal, modulating the received input signal, and generating a digital signal, an H-bridge controller for receiving the digital signal and... Agent: Wolf Greenfield & Sacks, P.c.

20080111620 - Noise reduction system and method for audio switching amplifier: Noise reduction for a switching amplifier system having a differential output stage and demodulator filter responsive to complementary PWM signals includes generating in-phase PWM signals and gradually adjusting their duty cycle between a low duty cycle and the full duty cycle of the complementary PWM signals, generating full duty cycle... Agent: Iandiorio & Teska

20080111622 - Hybrid doherty amplifier system and method: One embodiment of the invention includes an amplifier system. The system comprises a digital predistortion (DPD) system configured to receive an input signal and to provide the input signal as a first digital signal component along a first amplifier path and a second digital signal component along a second amplifier... Agent: Texas Instruments Incorporated

20080111623 - Input signal power control: A level control circuit is responsive to some parameter of an input signal, e.g., signal level, to selectively bypass around an active circuit (e.g., amplifier stage) rendered unnecessary in view of the detected condition of the input signal, e.g., a signal level satisfying some threshold criteria. In addition to bypassing... Agent: Fulbright & Jaworski L.l.p

20080111624 - Class-d driving method for stereo load: The present invention provides a class D amplifier and method for driving a tri-wired stereo amplifier. Additionally, the class D amplifier includes a first filter, a second filter, a processor, a 2D-quantitizer, a signal generator, and a logic circuit. The class D amplifier and method of the invention can reduce... Agent: Birch Stewart Kolasch & Birch

20080111625 - Detection device, sensor, and electronic instrument: A detection device includes a detection circuit. The detection circuit includes an amplifier circuit, a synchronous detection circuit, and a filter section. The amplifier circuit includes a first-type operational amplifier, and the filter section includes a second-type operational amplifier. When a channel width and a channel length of a differential-stage... Agent: Oliff & Berridge, Plc

20080111626 - Rail-to-rail class-ab operational amplifier: A rail-to-rail class-AB operational amplifier includes a first differential pair unit for receiving a pair of differential signals and generating a first control signal; a second differential pair unit for receiving the pair of differential signals and generating a second control signal; and an output stage for receiving the first... Agent: Birch Stewart Kolasch & Birch

20080111627 - Analog circuit, electronic instrument, and operational amplifier: An analog circuit includes a first circuit including a first-type operational amplifier of which a frequency of an amplification target signal is a first frequency, and a second circuit including a second-type operational amplifier of which a frequency of an amplification target signal is a second frequency lower than the... Agent: Oliff & Berridge, Plc

20080111628 - Data driver and display device: Disclosed is a data driver including a zero compensation resistor connected in series with a phase compensation capacitor between an output node of an input differential amplification stage and an output node of a succeeding amplification stage, and a control circuit that controls to switch a resistance value of the... Agent: Mcginn Intellectual Property Law Group, Pllc

20080111629 - Constant current bias circuit and associated method: A constant current bias circuit and associated method is disclosed. The constant current bias circuit comprises an output stage for amplifying a radio frequency (RF) signal, wherein the output stage is operably coupled with a voltage. The constant current bias circuit further comprises a bias circuit operably coupled with the... Agent: Booth Udall, Plc

20080111630 - Small size power amplifier with amplifiers switched: A small size power amplifier includes a first amplifier provided for a first signal path; a second amplifier provided for said first signal path; and a third amplifier provided for a second signal path parallel to said first signal path. A voltage control circuit configured to bias one of a... Agent: Mcginn Intellectual Property Law Group, Pllc

20080111631 - High-frequency power amplifier improved in size and cost: A high-frequency power amplifier of the present invention comprises a power supply unit for including a transistor for switching whose drain electrode-source electrode or collector electrode-emitter electrode are on/off controlled according to a pulse signal corresponding to an envelope signal of a high-frequency signal applied to a gate electrode or... Agent: Nec Corporation Of America

20080111632 - Cascode low noise amplifier with a source coupled active inductor: A cascode low noise amplifier includes an input transistor and an output transistor cascode together, the input transistor has a source coupled to an active inductor, and the output transistor has a drain to provide an output signal. By using the active inductor, the low noise amplifier has smaller size,... Agent: Rosenberg, Klein & Lee

20080106331 - Switching low noise amplifier: Disclosed are embodiments of an integrated circuit device adapted to selectively amplify one of multiple received input signals. The device incorporates at least two first stage transistors and a single second stage transistor. The first stage transistors are adapted to receive input signals from the same or different input signal... Agent: Frederick W. Gibb, Iii Gibb & Rahman, LLC

20080106332 - Switching low noise amplifier: Disclosed are embodiments of an integrated circuit device design adapted to selectively amplify one of multiple received input signals. The device design resides on a machine readable medium, which is used by a design house, customer, or manufacturer to aid in the design and manufacture of at least one embodiment... Agent: Frederick W. Gibb, Iii Gibb & Rahman, LLC

20080106330 - Feedback amplifier circuit operable at low voltage by utilizing switched operational amplifier and chopper modulator: In a feedback amplifier circuit, a first switching device executes an auto-zero operation by inputting a signal outputted from an amplifier to an input terminal of the amplifier during an auto-zero operation interval prior to an amplification interval. A first capacitor accumulates and holds an offset voltage at the output... Agent: Wenderoth, Lind & Ponack, L.L.P.

20080106333 - Method and system for out of band predistortion linearization: The present invention discloses a method and a system for out-of-band predistortion linearization, comprising steps of: dividing base band inputted or intermediate frequency signal into an in-band signal branch and an out-of-band signal branch; processing the in-band signal to form RF (Radio Frequency) signal; processing the out-of-band signal to form... Agent: Lowe Hauptman Ham & Berner, LLP

20080106334 - Low-voltage operational amplifier and operational amplifying method: A low-voltage operational amplifier includes a differential amplifying stage, an output amplifying stage and a compensation stage. The differential amplifying stage amplifies a difference between a first signal and a second signal that constitute a differential pair using an input pair of NMOS transistors, and outputs an amplified first signal... Agent: F. Chau & Associates, LLC

20080106335 - Differential circuit: Disclosed is a differential circuit including a first transistor pair including first and second transistors having gates for receiving a differential input signal; a second transistor pair including third and fourth transistors having gates for commonly receiving a common mode voltage of the differential input signal, having drains connected to... Agent: Mcginn Intellectual Property Law Group, PLLC

20080106336 - Differential amplifier with current source controlled through differential feedback: A differential amplifier includes a first electrical path formed between a first transistor and a first load impedance; a second electrical path formed between a second transistor and a second load impedance; a tail-current transistor coupled to the first and second transistors; an input end of a feedback amplifier coupled... Agent: Ratnerprestia

20080106337 - Bias current compensation circuit for a differential input stage: A bias current compensation circuit for a differential input stage has a compensation current supplying circuit and a compensation selecting circuit. The compensation current supplying circuit generates a compensation current. The compensation selecting circuit is coupled between the compensation current supplying circuit and a first and a second input terminals... Agent: North America Intellectual Property Corporation

20080106338 - Received-light amplifier: The present invention has as an object to provide, for received-light amplifiers capable of changing the current-voltage conversion efficiency by changing the resistance of feedback resistors, a received-light amplifier which can prevent the deterioration of output voltage linearity occurring when the current-voltage conversion efficiency is low. The present invention includes:... Agent: Greenblum & Bernstein, P.L.C

20080100379 - Sensor interface circuitry having adjustable gain and q, and method for adjusting sensor interface circuitry gain and q: A sensor interface filter having adjustable gain and Q is provided. The sensor interface includes a first operational amplifier coupled to gain circuitry, a gain stage, and a resistor. The gain circuitry and gain stage are electrically coupled to each other. The gain stage includes a gain stage switch, and... Agent: Delphi Technologies, Inc.

20080100380 - Operational amplifier and display device: To reduce the apparent effect of offset voltage by making the offset voltage spatially scattered. An operational amplifier 1 includes: a first differential pair having N-channel MOS transistors MN1 and MN2; a second differential pair having P-channel MOS transistors MP1 and MP2; an output stage having output transistors NP3 and... Agent: Mcginn Intellectual Property Law Group, PLLC

20080100381 - Common drain driven cascode enhancement mode traveling wave amplifier: A traveling wave amplifier includes a synthetic gate line, a synthetic drain line and a plurality of common drain driven cascode transistor circuits each connected between the synthetic gate line and the synthetic drain line.... Agent: Kathy Manke Avago Technologies Limited

20080100382 - System and method for pre-charging a current mirror: A system for pre-charging a current mirror includes a controller configured to provide a first current and an additional current to a current mirror to rapidly charge a capacitance associated with the current mirror based on a reference voltage.... Agent: Smith Frohwein Tempel Greenlee Blaha, LLC

20080100383 - Bias circuit: A bias circuit 100 comprises: a first reactance means 2 connected to an AC circuit; a second reactance means 3 connected to the first reactance means 2; a switch 7 connected to a connection point 210 between them; a third reactance means 8 connected to the switch 7; a capacitive... Agent: Oblon, Spivak, Mcclelland Maier & Neustadt, P.C.