Amplifiers inventions 12/07

20070296489 - Audio system and processing method of storing and reproducing digital pulse width modulation signal: A digital audio system to store and reproduce a digital PWM signal and a method of processing an audio signal. The method includes; converting an audio source signal into a digital pulse width modulation (PWM) signal through a series of signal processing processes and storing the PWM signal in a... Agent: Stanzione & Kim, LLP

20070296490 - Db-linear analog variable gain amplifier (vga) realization system and method: A dB-linear variable gain amplifier, a method for creation, and a system includes an amplifier; a pair of resistor arrays operatively connected to the amplifier, wherein each resistor array comprises MOS transistor resistive switches; a differential ramp-generator circuit operatively connected to the pair of resistor arrays; and voltage control lines... Agent: Gibb & Rahman, LLC

20070296491 - Noise-shaping amplifier with waveform lock: A generalized amplifier architecture is described which employs noise-shaping feedback, and for which the output waveform closely resembles the input waveform.... Agent: Beyer Weaver LLP

20070296492 - single stage balanced voltage amplifier: A balanced voltage amplifier is disclosed as comprising a single stage containing three pairs of vacuum tube triodes configured to amplify two input signals (+INPUT, −INPUT) and to generate two output signals (+OUTPUT, −OUTPUT). The balanced voltage amplifier offers high voltage gain, wide bandwidth and low output impedance. Local feedback... Agent: William J. Sapone Coleman Sudol Sapone P.C.

20070296493 - Enhanced digital predistortion: In one embodiment of the present invention, a weight vector is generated based on a pre-distorted input signal and an output signal of an amplifier using a computation reduction technique. The computation reduction technique decomposes a number of multiplication operations between complex numbers such that a number of multiplications and... Agent: Harness, Dickey & Pierce, P.L.C

20070296495 - Distortion compensating apparatus: The number of times of referring to of a storing unit in a distortion compensating apparatus is averaged and temporary degradation of the distortion property is avoided. The distortion compensating apparatus include a pre-distorting unit that applies a distortion compensating process to a transmission signal using a distortion compensation coefficient,... Agent: Katten Muchin Rosenman LLP

20070296494 - Predistorter: A predistorter for correcting distortion caused by a memory effect in amplifying a signal by an amplifier is provided. In the memory PD 2 provided to the predistorter, the level detection means 21 detects the level of the signal, the coefficient output means 22 outputs the coefficient corresponding to the... Agent: Wenderoth, Lind & Ponack, L.L.P.

20070296496 - Apparatus for reducing offset voltage drifts in a charge amplifier circuit: An apparatus for reducing offset voltage drifts in a charge amplifier circuit is disclosed. The apparatus includes a charge amplifier circuit and a bias current compensation circuit. The bias current compensation circuit supplies bias current to lower any offset voltage drift at the output of the charge amplifier.... Agent: Dillon & Yudell LLP

20070296497 - Amplifier circuit with cross-coupled cascode transistors: Embodiments of the present invention provide differential pair amplifier circuits including cross-coupled cascode transistors. Other embodiments may be described and claimed.... Agent: Schwabe, Williamson & Wyatt, P.C.

20070296498 - High linearity low noise variable gain amplifier with continuous gain control: A variable gain amplifier comprises a plurality of serially connected transistor cells, in which each of the transistor cells has a plurality of connecting terminals. The first terminals of the transistor cells are serially coupled together to receive a first input voltage. The second terminals of the transistor cells are... Agent: Mcdermott Will & Emery LLP

20070296499 - Amplifier circuit having a compensation circuit coupled to an output node of an operational amplifier for improving loop stability: An amplifier circuit includes an operational amplifier and a compensation circuit. The operational amplifier includes an amplifying stage for amplifying an input signal to generate an amplifying signal; and an output stage coupled to an output node of the amplifying stage for receiving the amplifying signal and generating an output... Agent: North America Intellectual Property Corporation

20070296500 - Channel state aided automatic gain control: An apparatus comprises a circuit for producing a channel gain control signal, and an amplifier for amplifying a signal of interest in response to the channel gain control signal, wherein the channel gain control signal is generated from a channel state signal that is not derived from the signal of... Agent: Pietragallo, Bosick & Gordon LLP

20070296501 - Variable-gain amplifier: There is provided a variable-gain amplifier, including two cascode amplifiers and an attenuator. The cascode amplifiers are mutually connected in parallel via the attenuator.... Agent: Sughrue Mion, PLLC

20070296502 - Method for double sampling loop negative feedback and double sampling negative feedback amplifier: A method for double sampling loop negative feedback comprising: obtaining a low-frequency feedback signal from the output of the amplifier; obtaining a high-frequency feedback signal from part of the amplifier of which high-frequency phase shift is low, wherein two-ways sampling signals have the same amplifying phase; combining the two-ways sampling... Agent: Baker Donelson Bearman Caldwell & Berkowitz, PC

20070296503 - Radio frequency amplifier circuit and mobile communication terminal using the same: A bias circuit 12 includes: a transistor Q5 operable to supply, to an amplifier 11, a bias current in accordance with a base current supplied thereto; a transistor Q3 operable to pass a current in accordance with a reference voltage Vref; a transistor Q2 operable to correct, in accordance with... Agent: Mcdermott Will & Emery LLP

20070296504 - Integrated implementation of a voltage boost follower and method therefor: A collector boost circuit is disclosed for providing a first voltage in a first mode of operation to a power amplifier, and another voltage in a second mode of operation to the power amplifier. The collector boost circuit uses an indicator signal derived by an RF detector to switch between... Agent: Kenyon & Kenyon LLP

20070296506 - High frequency amplifier configuration for improved feedback capacitance neutralization: A high frequency amplifier is provided with: an input terminal receiving a high frequency signal; an output terminal; a three-terminal active element having a first terminal connected with the input terminal and a second terminal connected with the output terminal; a transmission line; and a capacitive structure. The three-terminal active... Agent: Mcginn Intellectual Property Law Group, PLLC

20070296505 - Power amplifier suppressing radiation of second harmonic over wide frequency band: Two trap circuits different in frequencies at which short-circuit is established are provided in an output matching circuit. Out of the two trap circuits, the trap circuit higher in frequency at which short-circuit is established is arranged closer to a power amplification element. Thus, a frequency band higher than a... Agent: Birch Stewart Kolasch & Birch

20070296507 - Cascode-connected amplifier circuit, semiconductor integrated circuit using same, and receiving apparatus using same: A cascode-connected amplifier circuit according to the present invention includes two transistors cascode-connected to each other. The cascode-connected amplifier circuit includes a switching element by which it is determined whether or not a collector of an input-side transistor is grounded. Thus, a cascode-connected amplifier circuit can be realized which makes... Agent: Birch Stewart Kolasch & Birch

20070290743 - Circuit and method for controlling the power mode a class-d amplifier: A circuit and a method for controlling the power mode of a class-D amplifier are provided. The power mode control circuit comprises an amplitude detector and a duration detector. The amplitude detector provides an amplitude signal according to the absolute signal level of an input signal. The duration detector provides... Agent: Jianq Chyun Intellectual Property Office

20070290744 - Radio frequency switching circuit, radio frequency switching device, and transmitter module device: The present invention provides an inexpensive radio frequency switching circuit having desirable radio frequency characteristics over a wide band and desirable endurance against the inflow of a high voltage signal such as an electrostatic surge. Either a negative bias voltage or a positive bias voltage being greater than or equal... Agent: Mcdermott Will & Emery LLP

20070290746 - Control of an adjustable gain amplifier: A method of controlling an adjustable gain of an amplifier is disclosed. The method includes setting an output of a replica amplifier to be equivalent to a precision reference with a control loop, summing an adjustable offset voltage into the control loop, adjusting the adjustable offset voltage until an error... Agent: Tzero Patent Dept.

20070290741 - Technique to improve the gain and signal to noise ratio in cmos switched capacitor amplifiers: The present invention comprises switched capacitor amplifiers including positive feedback on semiconductor devices, wafers, and systems incorporating same and methods for amplifying signals using positive feedback, while maintaining a stable gain and producing an improved signal-to-noise ratio. One embodiment includes a switched capacitor amplifier comprising a CMOS amplifier, a feed-in... Agent: Trask Britt, P.C./ Micron Technology

20070290742 - Method for controlling a linear power amplifier: A linear power amplifier filters an instantaneous input signal to generate a filtered input signal, combines the instantaneous input signal and filtered input signal to generate a modified drain source voltage waveform and modulates a switched mode power supply to the linear power amplifier in accordance with the modified waveform.... Agent: Staas & Halsey LLP

20070290745 - Low-noise amplifiers: A low-noise amplifier, that utilizes multiple monolithic transformer magnetic feedback to simultaneously neutralize the gate-drain overlap capacitance of the amplifying transistor and achieve high gain at high frequencies when driving an on-chip capacitance, is shown. The multiple transformer topology permits negative and positive feedback to be applied constructively, allowing for... Agent: Blakely Sokoloff Taylor & Zafman

20070290747 - System and method for polar modulation using power amplifier bias control: Systems and techniques are described for applying a polar bias modulation having a phase component and an amplitude component to a signal amplified by a power amplifier. The power amplifier (PA) has a plurality of amplifier gain stages and is configured to amplify an input to create an amplifier output... Agent: Ingrassia Fisher & Lorenz, P.C. (fs)

20070290748 - Systems, methods, and apparatuses for linear envelope elimination and restoration transmitters: Systems, methods, and apparatuses are provided for linear envelope elimination and restoration transmitters that are based on the polar modulation operating in conjunction with the orthogonal recursive predistortion technique. The polar modulation technique enhances the battery life by dynamically adjusting the bias level. Further, the analog orthogonal recursive predistortion efficiently... Agent: Sutherland Asbill & Brennan LLP

20070290749 - Systems, methods, and apparatuses for multi-path orthogonal recursive predistortion: System and methods are provided for multi-path orthogonal recursive predistortion. The systems and methods may include generating a first orthogonal signal and a second orthogonal signal, where the first and second signals are orthogonal components of an input signal and processing, at a first predistortion module, the first orthogonal signal... Agent: Sutherland Asbill & Brennan LLP

20070290750 - Circuit for reducing distortion of class d amplifier: A class-D switching amplifier is disclosed. The class-D switching amplifier includes two control circuits, a load, and six switching devices. The load is coupled to the six switching devices. The first and the second control circuits provide a first and a second PWM pulse respectively. Each of the first and... Agent: North America Intellectual Property Corporation

20070290751 - Regulator circuit: With the objective of reducing current consumption of a regulator circuit per se, switches for performing on/off of an operating current are inserted in series with transistors of a reference voltage generating unit and a differential amplifying unit that constitute the regulator circuit. A switch for turning on/off an electrical... Agent: Volentine & Whitt PLLC

20070290752 - Adjusting methods of arithmetic multiplying circuit, drive circuit, and phase margin: An arithmetic amplifying circuit for driving a capacitive load is provided including a voltage follower circuit converting an input signal to impedance, and a resistance circuit which is serially connected between the voltage follower circuit and an output of the arithmetic amplifying circuit. The voltage follower circuit includes a differential... Agent: Harness, Dickey & Pierce, P.L.C

20070290753 - Method and system for varying gain exponentially with respect to a control signal: A method for varying gain exponentially with respect to a control signal is provided. The method includes receiving a primary control signal. A secondary control signal is generated based on the primary control signal. The secondary control signal is provided to a variable gain amplifier and is operable to exponentially... Agent: Stmicroelectronics, Inc.

20070290754 - Push-pull amplifier and method for low noise amplification: Provided is an amplifier including: an amplifier circuit receiving differential signals to generate amplified differential signals; a buffer generating buffered signals by buffering each signal generated by controlling a direct current (DC) component of the differential signals; and an impedance matching device coupled between two terminals wherein each of the... Agent: Sughrue Mion, PLLC

20070290755 - Gain-step transconductor: A gain-step transconductor circuit operates with multiple gain values. The gain can be stepped from one gain value to another by selecting a different signal path between an input node and an output amplifier. The output amplifier may operate as a common source amplifier or a common gate amplifier.... Agent: Lemoine Patent Services, PLLC C/o Intellevate, LLC

20070290756 - Loop control apparatus and method thereof: An electrical device and a loop control method are provided. A data signal is obtained from a front end. A variable gain amplifier amplifies the data signal based on a gain value. An analog to digital converter samples the amplified data signal output therefrom to generate a digital data signal.... Agent: Thomas, Kayden, Horstemeyer & Risley, LLP

20070290757 - Input system for a variable gain amplifier having class-ab transconductance stages: A variable gain amplifier includes an attenuator having a plurality of pairs of tap points, and a plurality of pairs of gm cells, wherein each pair of gm cells is coupled to a corresponding pair of the tap points, and each pair of gm cells is constructed and arranged to... Agent: Marger Johnson & Mccollom, P.C.

20070290758 - Electronic volume apparatus: v

20070290759 - Analog transconductance amplifier: An analog transconductance amplifier includes an input stage including a first transistor and a second transistor connected in series to the first transistor. The first and second transistors are connected between positive and negative voltages and are respectively controlled by an input voltage and a first control voltage for generating... Agent: Allen, Dyer, Doppelt, Milbrath & Gilchrist P.A.

20070290760 - Method and system for generating a temperature-compensated control signal: A method for generating a temperature-compensated control signal is provided. The method includes receiving a constant control signal. A temperature-compensated control signal is generated based on the constant control signal. The temperature-compensated control signal is provided to a variable gain amplifier. The temperature-compensated control signal is operable to cause the... Agent: Stmicroelectronics, Inc.

20070290761 - Signal amplifier circuit: A signal amplifier circuit includes a negative feedback amplifier circuit having an output terminal, a first voltage limiting device for limiting the output voltage from the negative feedback amplifier circuit, a second voltage limiting device for limiting the output voltage from the negative feedback amplifier circuit, a first reference voltage... Agent: Kanesaka Berner And Partners LLP

20070290762 - Two-port dual-gate hemt for discrete device application: A two-port dual-gate field-effect transistor for amplifier applications, wherein a self-bias circuit comprising a number of passive elements, such as resistors, diodes and capacitors, is utilized to coupled the output of the amplifier with a second gate of the dual-gate device as a bias source, which transforms the conventional three-port... Agent: Bacon & Thomas, PLLC

20070285159 - High-impedance level-shifting amplifier capable of handling input signals with a voltage magnitude that exceeds a supply voltage: A level-shifting amplifier is provided for level-shifting an input signal with a voltage magnitude that exceeds a supply voltage of the amplifier. In operation, the amplifier has an input impedance of greater than 100 MOhms.... Agent: Zilka-kotab, PC

20070285157 - Distribution of radio-frequency signals in an electronic circuit: The invention relates to the distribution of a radio-frequency signal to various modules (20, 30, 40) on a printed circuit board (10). The radio-frequency signal supplied via an antenna plug (11) is led over a multi-section (12, 13, 14, 15) line, a respective decoupler (32) being inserted between two sections... Agent: Nxp, B.v. Nxp Intellectual Property Department

20070285158 - Amplifier unit and method of detecting failure in the same: The present invention provides an amplifier unit including a carrier amplifier biased for Class A or Class AB operation; a peak amplifier biased for Class B or Class C operation, wherein an input signal is input to the carrier amplifier and the peak amplifier, and wherein output signals from the... Agent: Bingham Mccutchen LLP

20070285160 - Input-gain control apparatus and method: Provided are input-gain control apparatus and method of an audio amplifier. A gain of an acoustic signal is automatically attenuated based on a pre-set limited level to minimize distortion of the acoustic signal caused by clipping of the acoustic signal, and thereby limit an over-input of the acoustic signal to... Agent: Sughrue Mion, PLLC

20070285162 - Highly linear low-noise amplifiers: A predistortion method for CMOS Low-Noise-Amplifiers (LNAs) to be used in Broadband Wireless applications is presented. The method is based on the nulling of the third order Intermodulation distortion (IMD3) of the main amplifier by a highly nonlinear predistortion branch. Maximum third order product cancellation is ensured by a transformer... Agent: Blakely Sokoloff Taylor & Zafman

20070285161 - Method and apparatus for amplifying a signal modulated in amplitude: A method and apparatus for amplifying a signal modulated in amplitude using amplifiers having a given dynamic range corresponding to a limited conduction angle, comprising separating the signal in a first signal and in a second signal depending on the dynamic range of the amplifiers, wherein each of the first... Agent: Ogilvy Renault LLP

20070285163 - Method of amplifying a digital signal and device therefor: An efficient method of amplifying a digital signal with reduced electromagnetic interference is disclosed. The invention applies an average amplitude detector to the input signal to control the clock frequency of a pseudo-random number generator so that the clock signal decreases when the average amplitude of the signal increases. The... Agent: Office Of The Assoc. Gen. Counsel (ip & T)

20070285165 - Low voltage cmos differential amplifier: There is provided a device including a PMOS differential amplifier and an NMOS differential amplifier. The NMOS differential amplifier is coupled to the PMOS differential amplifier. The device is configured to operate as an inverter when a supply voltage is below a predetermined threshold.... Agent: Fletcher Yoder (micron Technology, Inc.)

20070285164 - Operational amplifier: A disclosed operational amplifier includes: a pair of differential stages; a cascode amplifier stage; and an output stage. A threshold voltage of an output transistor constituting the output stage is higher than a threshold voltage of other transistors.... Agent: Dickstein Shapiro LLP

20070285166 - Fully differential sensing apparatus and input common-mode feedback circuit thereof: A fully differential sensing apparatus and an input common mode feedback circuit are provided. The input common mode feedback circuit includes a common mode error amplifier and a plurality of adaptive conductance elements. Each adaptive conductance element behaves with a low impedance characteristic when its anode voltage is greater than... Agent: Jianq Chyun Intellectual Property Office

20070285167 - Class ab amplifier circuit with combined quiescent current and common mode control: It is an object of the present invention to provide an amplifier circuit that supplies a differential output signal (Voutp-Voutn) with a stable common mode potential (½×(Voutp+Voutn)) and a stable amplification characteristic. An essential feature of the invention is a control path (24, 26, 30, 28, 36, 38, 34, 32)... Agent: Pearne & Gordon LLP

20070285168 - Solid-state rf power amplifier for radio transmitters: An RF power amplifier includes first and second field effect transistors having a gate, a source, and a drain, having an output power rating of at least 200 watts, and operating with a drain-to-source voltage that is greater than 50 VDC. The transistors are configured as a push-pull amplifier. The... Agent: Pearne & Gordon LLP

20070285169 - Transmitter and control method for same: A transmitter of the invention, according to a first aspect, has first and second driving circuits with reverse-current prevention elements connected between output terminals and power supply terminals, and a control circuit which controls the outputs of the first and second driving circuits, the control circuit controlling the first and... Agent: Sughrue Mion, PLLC

20070285170 - Transmitter power control loop for high-speed wireless lans: A low cost, robust method and apparatus for controlling the gain of a power amplifier to compensate for changes that are gradual with time. The bias circuit of a power amplifier is sent one of three signals in response to a measurement of the average output power level of the... Agent: Synnestvedt Lechner & Woodbridge LLP

20070285171 - High-speed cmos current mirror: A CMOS current mirror is provided that includes a current input, an input transistor, whose conductivity path is located between the current input and a reference potential terminal, a current output, an output transistor, whose conductivity path is connected to the reference potential terminal and which supplies the current output... Agent: Mcgrath, Geissler, Olds & Richardson, PLLC

20070285172 - Fast bias for power amplifier gating in a tdma application: RF amplifier bias system for TDMA application. A bias circuit (200) is coupled to an RF power amplifier (201) circuit. The bias circuit includes a charge pump/sink circuit (215), a voltage reference circuit (204) and voltage scaling circuit (208, 210, 214). The bias system provides fast response time when transitioning... Agent: Harris Corporation C/o Darby & Darby PC

20070285173 - Frequency compensating circuit including a current-mode active capacitor and control circuit: A frequency compensating circuit having a current-mode active capacitor is disclosed. The frequency compensating circuit includes a first transconductance amplifier and a current-mode active capacitor. The first transconductance amplifier amplifies a feedback voltage signal in a current mode to provide the amplified voltage to a first node. The current-mode active... Agent: Sidley Austin LLP

20070285174 - High-frequency circuit of reduced circuit scale: A high-frequency circuit is provided. In the high-frequency circuit, a first PIN diode is provided in a signal line and a second PIN diode is provided between the signal line and ground so that an attenuating circuit is formed. A power supply is applied to one end of a series... Agent: Beyer Weaver LLP

20070285175 - Triple cascode power amplifier of inner parallel configuration with dynamic gate bias technique: Provided is a power amplifier which fits to a deep-submicron technology in radio frequency wireless communication. The power amplifier includes a cascode including a first transistor which receives and amplifies an input signal, and a second transistor which is connected to the first transistor in series and operated by a... Agent: Ladas & Parry LLP

20070279126 - common-mode technique for a digital i/p class d loop: In a preferred embodiment, a Class-D amplifier is powered by a power supply providing power by way of a power supply voltage node and a ground node, the amplifier having improved common-mode voltage control. A first integrator stage receives an input signal and provides an output signal, the integrator stage... Agent: Texas Instruments Incorporated

20070279127 - High linearity modulation system and modulation method: A modulation system and method having a high linearity. The system is a PWM modulator or a class D amplifier and includes an integrator, a low pass filter (LPF), a comparator, and an output circuit. The LPF is located before the comparator. Jitter noise produced by the comparator and/or switching... Agent: Frank Chau, Esq. F. Chau & Associates, LLC

20070279128 - Electrically conductive attachment device: A power amplifier (power amplifier) having multiple solid state sub-amplifiers connected in parallel between the power amplifier input and the power amplifier output are described. The signal input to the power amplifier is provided to an RF splitter connected between the power amplifier input connector and the input of each... Agent: Knobbe Martens Olson & Bear LLP

20070279129 - Methods and apparatus to provide slew enhancement for low power amplifiers: Methods and apparatus to provide increased current to a cascode amplifier to maximize slew rate are disclosed. The amplifier has a first input coupled to an input switch and a load circuit for amplifying an input voltage on the first input. A slewing input voltage to the amplifier is detected.... Agent: Texas Instruments Incorporated

20070279130 - High speed amplifier with controllable amplification and output impedance and comparator using the same: In an amplifier including first and second power supply terminals, first and second output terminals, a first load connected between the first power supply terminal and the first output terminal, a second load connected between the first power supply terminal and the second output terminal, a constant current source connected... Agent: Mcginn Intellectual Property Law Group, PLLC

20070279131 - Variable gain amplifier and differential amplifier:

20070279132 - Apparatus for biasing a complementary metal-oxide semiconductor differential amplifier: A bias generation circuit for biasing a differential amplifier is disclosed. The bias generation circuit is coupled to the differential amplifier. After determining a common-mode voltage of a pair of differential outputs from the differential amplifier, the bias generation circuit generates a bias voltage, which is proportional to the determined... Agent: Dillon & Yudell LLP

20070279133 - Solid state microwave power amplifier: A power amplifier (power amplifier) having multiple solid state sub-amplifiers connected in parallel between the power amplifier input and the power amplifier output are described. The signal input to the power amplifier is provided to an RF splitter connected between the power amplifier input connector and the input of each... Agent: Knobbe Martens Olson & Bear LLP