Amplifiers inventions 06/07

20070146065 - Chopper amplifier circuit and semiconductor device: Provided is a chopper amplifier circuit capable of reducing an offset voltage of a sensor bridge and temperature characteristics of the offset voltage. An offset adjusting voltage generation circuit for generating a voltage equal to an offset voltage of a sensor bridge and an offset temperature characteristics adjusting voltage generation... Agent: Brinks Hofer Gilson & Lione

20070146066 - Methods for reducing switching interference in switching amplifiers: The present invention discloses a method for reducing switching interference in a switching amplifier. The switching amplifier includes a first half circuit having a first modulator and a first driver circuit, a second half circuit having a second modulator and a second driver circuit, a first reference wave generator for... Agent: John S. Egbert Egbert Law Offices

20070146067 - Switching amplifier: A switching amplifier of the invention boasts of an enhanced SN ratio in its output and an increased amplitude limit value in its input signal. The switching amplifier has a quantized signal generating section that converts an input signal to generate a quantized signal in the form of a PDM... Agent: Birch Stewart Kolasch & Birch

20070146068 - Device and method for controlling a voltage control signal: A device is disclosed that includes an amplification part for a linear transmitter, the amplification part being configured to amplify a transmission signal in accordance with a supply voltage control signal; a generation part configured to generate a power supply signal showing the level of the transmission signal; and a... Agent: Bingham Mccutchen LLP

20070146069 - Filterless class d power amplifier: A double reference wave modulation scheme for filterless power amplifiers is disclosed for reducing EMI and common mode voltages. In the filterless power amplifier, differential outputs for driving load impedance are feedback and corrected based on input audio signals. Reference wave generators generate reference waves. A control logic results pulses... Agent: J.c. Patents, Inc.

20070146070 - Differential cascode amplifier: A differential cascode amplifier is disclosed that includes in each branch two transistors connected to form a cascode circuit, and has a cross-compensation (neutralization) with at least one pair of capacitors for compensating a parasitic capacitance of a transistor of each branch, wherein in each case, one capacitor of the... Agent: Mcgrath, Geissler, Olds & Richardson, PLLC

20070146071 - Common-gate common-source transconductance stage for rf downconversion mixer: In an embodiment, a wireless device receiver chain includes a mixer with a common-gate common-source (CGCS) input stage. Differential signals from an off-chip matching network may be input to the CGCS input stage of the mixer, which downconverts the signals to baseband or some intermediate frequency. The input stage includes... Agent: Qualcomm Incorporated

20070146072 - Clock signal output circuit: 1st to nth pairs of transistors (n=an odd number) are connected in parallel, and each pair of transistors has an upper transistor and a lower transistor connected in series. A point between the upper transistor and the lower transistor of a preceding pair of transistors is connected to a gate... Agent: Oliff & Berridge, PLC

20070146073 - Differential circuit with offset control: There are four differential pairs, where each has first and second legs. The first pair is to receive a first data signal at its first leg, and a second data signal at its second leg. The second pair is to receive a first offset signal at its first leg, and... Agent: Blakely Sokoloff Taylor & Zafman

20070146074 - Preserving linearity of an isolator-free power amplifier by dynamically adjusting gain: An amplifier circuit (100) includes a driver stage ( ) 120 with at least an active device (140) for pre-amplification and output of a pre-amplified signal; and an output stage (160) with at least an active device (180) for further amplification of the pre-amplified signal and output of an amplified... Agent: Philips Intellectual Property & Standards

20070146075 - Analog multistage amplification circuit in the field of sensor: An analog multistage amplification circuit for keeping the total gain of analog amplifiers constant while automatically controlling gain of the amplifiers in accordance with an input signal level and improving the S/N ratio of the output signal. The amplification circuit includes an input stage amplifier, an output stage amplifier, a... Agent: Arent Fox PLLC

20070146076 - Power amplifier unit, communication terminal and control method of power amplifier unit: In order to achieve the object, a controller block 11 judges on the basis of an estimative output power value whether a power amplifier is in a first period in which it performs low power output operation or in a second period in which it performs high power output operation,... Agent: Oblon, Spivak, Mcclelland, Maier & Neustadt, P.C.

20070146077 - Radio frequency power amplifier: A radio frequency power amplifier 1 includes a former-stage transistor 2, a latter-stage transistor 3, and an inter-stage matching circuit 4 for connecting the former-stage transistor 2 and the latter-stage transistor 3. The inter-stage matching circuit 4 includes a high-pass filter circuit including a transfer line m1, a capacitor C1... Agent: Mcdermott Will & Emery LLP

20070146078 - Selective amplifier: A selective amplifier is disclosed that includes a first transistor, which has a first emitter, a first base, and a first collector, a second transistor, which has a second emitter, a second base, and a second collector, and a matching network. The first transistor is connected in the emitter circuit... Agent: Mcgrath, Geissler, Olds & Richardson, PLLC

20070146079 - Monolithically integrated power amplifier device: A monolithically integrated microwave frequency high power amplifier device comprises a plurality of transistors connected in a load modulation configuration wherein the number of the transistors that is operational depends on the drive level. The transistors have each a finger type layout, where fingers from different ones of the transistors... Agent: Maginot, Moore & Beck Chase Tower

20070146080 - Burst-mode tia (trans-impedance amplifier): Devices and methods for processing signals using a Burst-Mode TIA that meets EPON and GPON specifications are disclosed herein. A signal provided by a power detector is processed with the appropriate gain by using a gain selector which includes a feedback circuit to choose the gain internally, thereby eliminating the... Agent: Dr. Mark Friedman Ltd. C/o Bill Polkinghorn

20070139103 - Quiet power up and power down of a digital audio amplifier: A closed loop audio amplifier system and method of powering up/down the system without producing audible artifacts are provided. During power up, a prebias voltage is provided to each output connected to a speaker to increase the voltage to a nominal output level. High impedance switches are then driven at... Agent: Brinks Hofer Gilson & Lione

20070139104 - Standby and concurring system of a power amplifier and method for power amplifying: A power amplifier system including: M main power amplifiers and one standby power amplifier, where M is a positive integer; an input switching module, connected to the inputs of the M main power amplifiers and the standby power amplifier; an output switching module, connected to the outputs of the M... Agent: Harness, Dickey & Pierce, P.L.C

20070139105 - Doherty amplifier configuration for a collector controlled power amplifier: An efficient power amplifier circuitry for a mobile terminal or similar wireless communication device is provided. The power amplifier circuitry includes an output stage configured as a collector controlled Doherty amplifier, wherein the collector controlled Doherty amplifier increases the efficiency of the power amplifier at backoff power levels. The output... Agent: Withrow & Terranova, P.l.l.c.

20070139106 - Modified doherty amplifier: Systems and methods are provided for efficient amplification of a signal utilizing a modified Doherty amplifier system. A modified Doherty amplifier system includes a nonlinear main amplifier and a nonlinear auxiliary amplifier. An impedance-inverting network separates the main amplifier from an associated load. A second quarter wave transmission line separates... Agent: Tarolli, Sundheim, Covell & Tummino L.L.P.

20070139107 - Enhanced bandwidth envelope elimination and restoration: Systems and methods are provided for amplifying a composite input signal, comprising a drive signal and an envelope signal, at a power amplifier. A secondary modulation, representing a portion of the composite input signal falling outside of a frequency band associated with the envelope signal, is produced for the drive... Agent: Tarolli, Sundheim, Covell & Tummino L.L.P.

20070139108 - Method and apparatus for performing digital pre-distortion: A pre-distorter that compensates for amplitude and phase distortion created by an amplifier. During a training session, the amplifier is stimulated with input signals of pre-selected amplitude and phase at various temperatures and the amplifier output is captured and converted into data sets. Polynomials are then fitted to the data... Agent: Gardner Groff Santos & Greenwald, P.C.

20070139109 - Class d amplifier with start-up click noise elimination: A circuit for minimizing audible click noise upon the startup of a Class D audio power amplifier. The amplifier including a power switching output stage and a driver for driving the output stage receiving a driving signal and a shutdown signal, the shutdown signal preventing switching of the output stage.... Agent: Ostrolenk Faber Gerb & Soffen

20070139110 - Transconductance circuit: The present invention relates to a transconductance circuit intended to convert a differential input voltage, supplied as two signals to two inputs, IN+ and IN− respectively, into a differential output current. According to the invention, each of the two signals of said differential input voltage is supplied to each input,... Agent: Philips Intellectual Property & Standards

20070139111 - Buffer amplifier for source driver: A buffer amplifier for source driver is disclosed. The buffer amplifier has an N-channel differential amplifier and a P-channel differential amplifier as its input stages so as to achieve rail-to-rail input, and a class AB amplifier to push-pull the output stage so as to achieve rail-to-rail output. The output stage... Agent: Jianq Chyun Intellectual Property Office

20070139112 - Method and apparatus for stabilizing rf power amplifiers: A method and apparatus is provided for use in power amplifiers for reducing the peak voltage that transistors are subjected to. A power amplifier is provided with first and second switching devices and an inductor connected between the switching devices. The switching devices are driven such that the switching devices... Agent: Johnson & Associates

20070139113 - Automatic gain control apparatus of cable modem, and lock-time acquisition method using the same: Provided is an automatic gain control (AGC) apparatus of a cable modem. The apparatus includes: a gain controller for measuring a power level of digital input signals transmitted from outside, accumulating the measured values of the digital input signals for a predetermined period, acquiring an average size of the signals,... Agent: Mayer, Brown, Rowe & Maw LLP

20070139114 - Gain variable circuit and automatic gain control amplifier using the same: There is provided a gain variable circuit including: a first load connected between a first supply voltage node and a first output terminal that outputs a first output signal; a second load connected between the first supply voltage node and a second output terminal that outputs a second output signal... Agent: Volentine Francos, & Whitt PLLC

20070139115 - Cmos amplifiers with frequency compensating capacitors: The frequency and transient responses of a CMOS differential amplifier are improved by employing one or more compensating capacitors. A compensating capacitor coupled to a differential input of the CMOS differential amplifier is used to inject current into the differential input, such that the net current flow through the gate-to-drain... Agent: Schwegman, Lundberg, Woessner & Kluth, P.A.

20070139116 - Fully differential amplifier with continuous-time offset reduction: Fully differential amplifier circuits are described herein that set the common mode voltage as well as reduce the output offset voltage (offset cancellation). A circuit according to one embodiment includes a first section for generating first and second output signals on first and second outputs from first and second input... Agent: Zilka-kotab, PC

20070139117 - Amplifier and communication apparatus: A wide-band amplifier having a flat amplification characteristic over a wide frequency bandwidth, being prevented from degrading due to parasitic capacitance, and being short in group delay time. The wide-band amplifier includes a band-pass filter made of an LC parallel resonant circuit and an LCR series resonant circuit and provided... Agent: Oblon, Spivak, Mcclelland, Maier & Neustadt, P.C.

20070139118 - Fast-settling digital automatic gain control: A fast-settling digital automatic gain control circuit comprises first and second gain-controllable amplifiers in series. Each amplifier can be digitally switched between minimum and maximum gains by control logic that receives inputs from a multi-level voltage comparator. A peak detector connected to the output of the first gain-controlled amplifier is... Agent: Agilent Technologies Inc.

20070139119 - Variable attenuator: A variable attenuator which can sequentially control attenuation effectively and has a small variation in manufacturing, is provided. The variable attenuator has a first signal input terminal; a first signal output terminal; a first control terminal receiving a control voltage; an analog/digital converter converting the control voltage to M (M... Agent: Ratnerprestia

20070139120 - Rf amplifier with a bias boosting scheme: The present invention provides methods and apparatuses for an amplifier circuit for amplifying an input signal. An amplifier circuit for amplifying an input signal comprises an amplifying transistor circuit having a power transistor and a dc bias circuit having a plurality of current mirror circuits and a discharge transistor wherein... Agent: Thomas, Kayden, Horstemeyer & Risley, LLP

20070139121 - Amplifier symmetric supply regulation: A power converter receiving a single-sided supply which is ground-terminated and providing a positive supply and a regulated negative supply that is optimized to the expected output range of a class AB amplifier, as well as providing a symmetric positive supply having excellent efficiency. The converter finds application as a... Agent: Texas Instruments Incorporated

20070139123 - Apparatus of impedance matching for output driver and method thereof: An apparatus for impedance matching circuit is disclosed. The impedance matching apparatus has an output driver for outputting an output signal and includes an output data generator, for generating an output data signal; an output stage, for generating the output signal according to the output data signal, and receiving a... Agent: Law Offices Of Lai & Associates, P.C.

20070139122 - Radio frequency power delivery system: A system and method are provided for delivering power to a dynamic load. The system includes a power supply providing DC power having a substantially constant power open loop response, a power amplifier for converting the DC power to RF power, a sensor for measuring voltage, current and phase angle... Agent: Proskauer Rose LLP

20070132509 - Class d amplifier: A class D amplifier is provided that is capable of reducing distortion of a specific sampling frequency, and frequencies that are multiples of this frequency to a level where an LPF is not required and small-scale control circuit. Class D amplifier 100 is provided with H (full) bridge output section... Agent: Greenblum & Bernstein, P.L.C

20070132508 - Multi-phase power supply controller and method therefor: In one embodiment, a power supply controller is configured to use a plurality of ramp signals to generate a plurality of PWM control signals.... Agent: Semiconductor Components Industries, LLC Bradley J. Botsch

20070132510 - Class d amplifier: An amplifier circuit (100) includes a driver stage (120) with active devices (140) for pre-amplification and output of a pre-amplified signal; and an output stage (160) with active devices (180) for further amplification of the pre-amplified signal and output of an amplified signal. A detector (190) measures levels of forward... Agent: Nxp, B.v. Nxp Intellectual Property Department

20070132511 - Gain adjusting and circuit arrangement: The present invention relates to a method and circuit arrangement for adjusting a gain, wherein said circuit arrangement comprises at least a first output branch connected to a first load and a second output branch connected to a second load. The gain control function is realized based on a current... Agent: Harrington & Smith, PC

20070132512 - Variable gain amplifier: A variable gain amplifier is provided that scarcely suffers disturbance or interference such as carrier leak from other circuit blocks even when a plurality of circuits are constructed on the same semiconductor substrate, and that has low output impedance fluctuation. For the purpose of this, in a variable gain amplifier,... Agent: Stevens, Davis, Miller & Mosher, LLP

20070132513 - Variable gain amplifier: A complementary metal oxide semiconductor (CMOS) variable gain amplifier has a wider decibel-linear gain variation characteristic with respect to a control voltage when a signal is amplified. The variable gain amplifier includes: a bias input circuit for supplying a current corresponding to a bias voltage; an operation region combination and... Agent: Ladas & Parry LLP

20070132514 - Power device having connection structure compensating for reactance component of transmission line: Provided is a power device having a connection structure compensating for a reactance component, in which transistors are arranged and connected to minimize deterioration of transistor properties caused by heat by compensating for a reactance component causing a phase difference due to transmission lines used for connecting a plurality of... Agent: Ladas & Parry LLP

20070126499 - Multi-phase techniques for tuning and/or measuring operations of an amplifier: Certain embodiments of the present invention relate to techniques for tuning or measuring operational features of amplifiers, such as the transconductance of operational transconductance amplifiers (OTAs) and the gain of variable gain amplifiers (VGAs). Each technique employs (at least) two phases that involve the application of different input voltages. The... Agent: Mendelsohn & Associates, P.C.

20070126500 - Modulation method and apparatus: A modulation circuit for use in a radiofrequency transmitter includes a local oscillator circuit configured to generate one or more local oscillator signals at a desired frequency and with a duty cycle at or about twenty-five percent, and a modulator configured to generate one or more modulated signals responsive to... Agent: Coats & Bennett, PLLC

20070126501 - Variable gain amplifier and variable gain amplifier module: An analog variable gain amplifier (VGA) adjusting a signal level of a mobile communication system is provided. More particularly, design of a VGA using an operational transconductance amplifier (OTA) having a wide linear input/output range is disclosed. The VGA includes two double-differential-pair OTAs and feedback resistors. A first differential input... Agent: Ladas & Parry LLP

20070126502 - High gain, high efficiency power amplifier: An amplifier has a main amplifier circuit with multiple amplification stages, including a driving stage and an auxiliary amplifier circuit with multiple amplification stages, including a driving stage. A splitter circuit splits an input signal to provide path asymmetry in splitting the input signal between the main amplifier path and... Agent: Wood, Herron & Evans, LLP

20070126503 - Audio processing system and method for automatically adjusting volume: The present invention relates to an audio processing system and method for automatically adjusting volume. The method includes steps of: calculating a noise level as a reference noise level; periodically calculating a new noise level of a predetermined time period, and dividing the reference noise level by the new noise... Agent: North America Intellectual Property Corporation

20070126504 - Analogue power control in a saturated amplifier: A circuit is disclosed having a first series circuit path including a first switching transistor, a cascode transistor disposed in cascode arrangement with the first switching transistor, a transformer, and a fourth switching transistor. The circuit also has a second series circuit path having a second switching transistor, the transformer,... Agent: Kenyon & Kenyon LLP

20070126505 - Method and apparatus for stabilizing rf power amplifiers: A method and apparatus is provided for use in power amplifiers for reducing the peak voltage that transistors are subjected to. A power amplifier is provided with first and second switching devices and an inductor connected between the switching devices. The switching devices are driven such that the switching devices... Agent: Johnson & Associates

20070126506 - Low dc power rail-to-rail buffer amplifier for liquid crystal display application: A low DC power rail-to-rail buffer amplifier is suitable for liquid crystal display application. The buffer amplifier comprises: a dc bias stage, a pair of complementary differential amplifiers, a second stage amplifier, and output stage. The dc bias stage is used for the dc bias of the differential amplifiers and... Agent: Squire, Sanders & Dempsey L.l.p

20070126507 - Receiving apparatus: There may be provided a receiving apparatus including: a light receiving element which receives an optical signal and generates a current signal dependent on the optical signal; a conversion unit which converts the current signal into a voltage signal; a reference voltage generation unit which generates a reference voltage; a... Agent: Oblon, Spivak, Mcclelland, Maier & Neustadt, P.C.

20070126508 - Wide dynamic range amplifier gain control: Linear wide dynamic range variable gain amplifiers can be configured using a variable gain amplifier having an abbreviated gain control range in combination with a discrete attenuator controlled to select an attenuation from a predetermined set of attenuation values. The variable gain amplifier is configured to provide substantially linear gain... Agent: Townsend And Townsend And Crew, LLP

20070126509 - System and method for compensating for the effects of aging and temperature on transistor performance: Disclosed is a system and method for compensating for the effects of aging and temperature on the performance of transistors in an RF transmitter. The system and method use a temperature-based polynomial and a feedback control loop to correlate the drain current of each transistor with the desired performance characteristics... Agent: Honeywell International Inc. Patent Services

20070126510 - Audio process circuit structure and process method thereof: This invention discloses an audio process circuit structure and process method applying to a video/audio apparatus that at least comprises an audio signal detection unit, an OR gate logic circuit unit, an AND gate logic circuit unit and an audio amplifier process unit. The audio signal detection unit also comprises... Agent: Rosenberg, Klein & Lee