Amplifiers inventions 07/09

20090189689 - Power supply processing for power amplifiers: The present invention, generally speaking, uses multiple selectable power supply paths, a saturation detector, or combinations of the same to achieve efficient power supply processing. In one aspect of the invention, a power supply processing circuit includes a first switched converter stage and a second linear stage. Depending on the... Agent: Mcdermott Will & Emery LLP

20090189690 - Feed-forward automatic-gain control amplifier (ffagca) for biomedical applications and an associated method: The present invention is a feed-forward automatic-gain control amplifier (FFAGCA) for biomedical applications and associated method, the FFAGCA comprises a detector, a controller, a variable gain amplifier (VGA), an input and an output. The associated method to process various kinds of biomedical signals with the FFAGCA comprises acts of adjusting... Agent: Venable LLP

20090189691 - Method and apparatus for reducing intermodulation distortion in an electronic device having an amplifier circuit: An electronic device includes an amplifier circuit coupled to a linearizer. The amplifier circuit may receive a first input signal including first and second frequencies and generate a first output signal including a delta frequency signal at a delta frequency, which is the difference between the first frequency and the... Agent: Qualcomm Incorporated

20090189692 - 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.

20090189693 - Operational amplifier: An operational amplifier includes a differential amplifier circuit provided at an input stage and an amplifier circuit at a post stage. In the differential amplifier circuit, first and third bipolar transistors are PNP-type bipolar transistors and Darlington-connected. An inverting input terminal is connected to the base terminal of the first... Agent: Cantor Colburn, LLP

20090189694 - Differential amplifier with accurate input offset voltage: An amplifier with accurate input offset voltage is described. In one design, the amplifier includes first and second unbalanced differential pairs. The first unbalanced differential pair receives a differential input signal and provides a first differential current signal. The second unbalanced differential pair receives a differential reference signal and provides... Agent: Qualcomm Incorporated

20090189695 - Amplifier circuit having stacked main amplifier and parallel sub-amplifier: An amplifier circuit for amplifying an input signal to generate an output signal is provided. The amplifier circuit has a stacked main amplifier, a parallel sub-amplifier, and a signal combiner. The stacked main amplifier includes a first amplifier unit for outputting a first amplified signal generated from processing the input... Agent: North America Intellectual Property Corporation

20090189696 - Low-noise amplifier: A low-noise amplifier is provided according to the present invention. The low-noise amplifier includes a first amplifier stage, a second amplifier stage, a third amplifier stage, an input matching network, inter-stage matching networks, and an output matching network. The impedance of the input matching network and the input impedance of... Agent: Pearne & Gordon LLP

20090189697 - Auto-tuning amplifier: This document discloses, among other things, a front end circuit having a selectable center frequency. The center frequency is selected based on a control signal proportional to a phase difference between a reference frequency and an amplifier output. A resonant frequency of a tank circuit coupled to the amplifier is... Agent: Schwegman, Lundberg & Woessner, P.A.

20090184761 - Amplifier modulation method and apparatus: One embodiment relates to a power amplifier that includes a switched mode power amplification stage. The power amplification stage has an output configured to provide an amplified output voltage as a function of a drive signal, where the drive signal fluctuates during a first time and is inactive during a... Agent: Eschweiler & Associates LLC

20090184762 - Optimized resistor network for programmable transconductance stage: A voltage-to-current converter is provided. The voltage-to-current converter comprises an amplifier, a resistor network, an R-2R network, and switches. The amplifier has a first input node (which is an input signal), a second input node, and an output node. The resistor network is coupled to the output node of the... Agent: Texas Instruments Incorporated

20090184763 - Apparatus and method for digital pre-distortion, sharing feedback path in a multiple antenna wireless communication system: A multiple antenna wireless communication system using a DPD power amplifier and a method for controlling an amplitude of an input signal for a plurality of transmission paths of the DPD power amplifier are provided. The system includes a plurality of amplifiers, a plurality of couplers, a switch, a shared... Agent: JeffersonIPLaw, LLP

20090184764 - Power supply providing ultrafast modulation of output voltage: A circuit for use with a power amplifier that amplifies an input signal. The circuit may comprise an amplitude correction circuit and an open-loop switching regulator. The amplitude correction circuit may be configured to generate a corrected envelope signal from an input envelope signal that represents an envelope of the... Agent: K&l Gates LLP

20090184765 - Class-d amplifier and method therefor: In one embodiment, a class-D amplifier (11) is configured to form first (DP) and second (DN) PWM signals each having a duty cycle that is proportional to a received analog input signal (12) and responsively to enable a switch (31, 32) to short the outputs (13, 14) of the class-D... Agent: Semiconductor Components Industries, LLC Intellectual Property Dept. - A700

20090184766 - low-voltage wide-range linear transconductor cell: An improved low-voltage, low-power, wide range, and linear Gm Cell is disclosed. In one embodiment, a method of linearizing output current with an input voltage using a Gm Cell includes receiving an input differential voltage by an emitter degenerated input stage and outputting a current including a linear part and... Agent: Texas Instruments Incorporated

20090184767 - Operational amplifier: Disclosed herewith is a circuit system for improving a slew rate while reducing the power consumption in an operational amplifier that requires a comparatively high supply voltage (e.g., 5 V or upper) operation. The operational amplifier includes level shift circuits, differential pairs whose source connected serially, current voltage conversion circuit... Agent: Miles & Stockbridge PC

20090184768 - Attenuation compensating circuit: An attenuation compensating circuit includes a detector and a stabilizer. The detector has a dummy capacitor corresponding to a capacitor connected to an input terminal of an amplifier and, by detecting the degree of attenuation of a dummy signal passing through the dummy capacitor, detects the degree of attenuation when... Agent: Katten Muchin Rosenman LLP

20090184769 - Negative-feedback type ultra-wideband signal amplification circuit: A negative-feedback type ultra-wideband signal amplification circuit is proposed, which is designed for integration to an ultra-wideband (UWB) signal processing circuit system for providing a low-noise amplification function to UWB signals. The proposed circuit architecture is characterized by the provision of a dual-step filter circuit on the input side, the... Agent: Law Offices Of Mikio Ishimaru

20090184770 - Device and method for biasing a transistor amplifier: Provided is circuitry for biasing a transistor amplifier with a DC-voltage signal, the transistor amplifier having a first input terminal, a second input terminal, and an output terminal coupled to the second input terminal. The circuitry includes a sensor capacitor connected to the first input terminal and an impedance transistor... Agent: Sonnenschein Nath & Rosenthal LLP

20090179697 - Amplifier having a virtual ground and method thereof: An amplifier comprises first, second, and third modulators. The first modulator includes an input for receiving a first input signal, and an output for providing a first modulated output signal corresponding to the first input signal. The second modulator includes an input for receiving a second input signal, and an... Agent: Freescale Semiconductor, Inc. Law Department

20090179698 - Eefficient integrated linear amplifier module: A linear amplifier circuit includes a first matching circuit that receives a first signal and to produce a first impedance matched signal, a first power amplifier that produces a first amplified signal in response to the first impedance matched signal under the control of a first bias signal, a second... Agent: Xin Wen

20090179700 - Ac coupling circuits including resistive feedback and related methods and devices: An integrated circuit device may include an amplifier having an amplifier input configured to receive an input signal with the amplifier being configured to provide an amplifier output signal at an amplifier output responsive to the input signal received at the amplifier input. A capacitor may be coupled to the... Agent: Myers Bigel Sibley & Sajovec

20090179699 - Fully differential comparator and fully differential amplifier: A first to a fourth sampling switch (1a to 1d), a first to a fourth sampling capacitance (4 to 7), and a first and a second charge redistribution switch (2a, 2b) are provided on the input side of a differential amplifier (8). A first and a second reset switch (3a,... Agent: Mcdermott Will & Emery LLP

20090179701 - Fast switch for controlling a differential-pair amplifier: A differential-pair amplifier comprising a transistor pair. The differential-pair amplifier includes a current source coupled to the transistor pair for providing a bias current to the transistor pair. The differential-pair amplifier also includes a switching mechanism coupled to the transistor pair for steering the bias current away from the transistor... Agent: Sawyer Law Group LLP

20090179702 - Doherty amplifier: An integrated Doherty amplifier structure comprises an input bond pad (IBP), and an output bond pad (OBP). A first transistor (T1) forms the peak amplifier stage of the Doherty amplifier and has a control input (G1) to receive a first input signal (IS1) being an input signal of the Doherty... Agent: Nxp, B.v. Nxp Intellectual Property Department

20090179703 - High efficiency power amplifier: Disclosed a power amplifier including a main amplifier with class bias AB and a peak amplifier with class C bias. A quarter-wave length transmission line having a length equal to one-fourth of the wave-length of a fundamental frequency is connected to an output side of the peak amplifier. Outputs of... Agent: Young & Thompson

20090179704 - Load insensitive balanced power amplifier and related operating method: A balanced power amplifier that is insensitive to load line variations is provided. The balanced power amplifier is suitable for use in wireless transmitter applications, such as cellular telephones, mobile computing devices, and portable communication devices. An embodiment of such a balanced power amplifier includes an input coupler, first and... Agent: Ingrassia Fisher & Lorenz, P.C. (fs)

20090179705 - Impedance-mapping amplifier circuit with exclusively reactive negative feedback: An amplifier circuit has a transistor element that has an input terminal, an output terminal) and a third terminal. An input signal to be amplified is supplied to the input terminal. The amplified input signal is emitted as an output signal at the output terminal. The input terminal is connected... Agent: Schiff Hardin, LLP Patent Department

20090179706 - Capacitor gain-boost circuit: A circuit is disclosed that comprises a capacitor gain-boost circuit and an amplifier coupled to capacitor gain-boost circuit. A capacitor gain-boost circuit comprises of capacitor, gain-boost amplifier and biasing circuit. The gain-boost amplifier and capacitor provides optimum biasing operation and performance. Accordingly, through the use of capacitor gain-boost circuit, the... Agent: Louis Wong

20090174472 - Apparatus and method for improving the feedback linearity of a 1.5-bit sigma-delta class-d amplifier: A conversion circuit is provided for a 1.5-bit Σ-Δ class-D amplifier to improve the feedback linearity of the class-D amplifier, by periodically inverting and mixing a first positive feedback signal and a first negative feedback signal from the power stage of the class-D amplifier to generate a second positive feedback... Agent: Rosenberg, Klein & Lee

20090174473 - 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

20090174474 - Power amplifier: An amplifier element amplifies RF signals. An emitter follower unit drives the amplifier element at a constant voltage corresponding to a reference voltage supplied to a reference terminal from outside. A current injection unit drives the amplifier element a constant current corresponding to the reference voltage. An analog control unit... Agent: Leydig Voit & Mayer, Ltd

20090174475 - Smart linearized power amplifier and related systems and methods: A power amplifier subsystem that includes a first stage amplifier and a second stage amplifier. A first bias circuit is coupled to the first stage amplifier, and the first bias circuit has a variable impedance that increases with radio frequency (RF) power. A second bias circuit is coupled to the... Agent: Wilson Sonsini Goodrich & Rosati

20090174476 - Noise reduction circuit for canceling leakage signal: In a noise reduction circuit, a transistor circuit amplifies an input signal and outputs an output signal with supply of power from the DC voltage source via a power supply line circuit. The canceling signal adding circuit acquires and attenuates a part of the output signal, to generate a canceling... Agent: Wenderoth, Lind & Ponack L.L.P.

20090174477 - Multi-segment primary and multi-turn secondary transformer for power amplifier systems: Embodiments of the invention may provide for power amplifier systems and methods. The systems and methods may include a power amplifier that generates a first differential output signal and a second differential output signal, a primary winding comprised of a plurality of primary segments, where a first end of each... Agent: Sutherland Asbill & Brennan LLP

20090174478 - Circuit and method for generating a pwm control signal for a class-d amplifier: In a class-D amplifier, the input signal is compared with a carrier signal to generate a basic PWM signal, the PWM signal is then sent to a pulse processing unit, and by comparing with a basic periodic signal, half-width of the output PWM signal is extracted. Then, in the pulse... Agent: Rosenberg, Klein & Lee

20090174479 - High-voltage differential amplifier and method using low voltage amplifier and dynamic voltage selection: A differential amplifier (1D) includes circuitry (5,R1,R2,52) coupling a common mode component of an input voltage (Vin+−Vin−) to a maximum voltage selector circuit (53) that produces an internal voltage (VRAIL-TOP) equal to the larger of a first supply voltage (VREG) and the common mode component. An input amplifier circuit (46)... Agent: Texas Instruments Incorporated

20090174482 - High power integrated rf amplifier: An integrated HF-amplifÊer structure comprises in a first direction (FD) in the order mentioned: an input bond pad (IBP), a plurality of cells (CE1, CE2) being displaced with respect to each other in the first direction (FD), and an output bond pad (OBP). Each one of the cells (CE1, CE2)... Agent: Nxp, B.v. Nxp Intellectual Property Department

20090174481 - Multi-linearity mode lna having a deboost current path: A modified derivative superposition (MDS) low noise amplifier (LNA) includes a main current path and a cancel current path. Third-order distortion in the cancel path is used to cancel third-order distortion in the main path. In one novel aspect, there is a separate source degeneration inductor for each of the... Agent: Qualcomm Incorporated

20090174480 - Systems and methods for cascode switching power amplifiers: Example embodiments of the invention may provide systems and methods for a power amplifier. The systems and methods may include a first common-source device having a first source, a first gate, a first drain, and a first body, where the first source is connected to the first body, and wherein... Agent: Sutherland Asbill & Brennan LLP

20090174483 - Gain-controlled low noise amplifier means: A gain-controlled low noise amplifier means is provided. The amplifier means comprises an amplifier (T1), a first and second pin diode (D1, D2) coupled in series with opposite forward directions in a negative feedback loop of the amplifier (T1) between an input and an output of the amplifier (T1). The... Agent: Nxp, B.v. Nxp Intellectual Property Department

20090174484 - Power amplifier: An amplifying transistor for amplifying a radio frequency signal between an input terminal and an output terminal. The cathode of a first diode is connected to the input terminal and the anode of a second diode is connected to the output terminal. A matching and attenuating circuit is connected between... Agent: Leydig Voit & Mayer, Ltd

20090174485 - Over-current sensing during narrow gate drive operation of class d output stages: Two transistors of a class D output stage are driven by complementary, variable duty cycle signals PWM+ and PWM−. When the pulse width of the PWM+ signal becomes too narrow for reliable operation of prior art over-current protection circuits sensing the drain to source voltage of FET1 driven by PWM+,... Agent: Texas Instruments Incorporated

20090167429 - Methodology for assessing degradation due to radio frequency excitation of transistors: One embodiment relates to an on-chip power amplifier (PA) test circuit. In one embodiment, a PA test circuit comprises a controllable oscillator (CO) configured to generate a radio frequency (RF) signal, a parallel resonant circuit tuned to the radio frequency, a pre-power amplifier (PPA) coupled to the CO and the... Agent: Texas Instruments Incorporated

20090167430 - Switched-capacitor amplifier arrangement and method: A switched-capacitor amplifier arrangement and a method to amplify a signal are presented. A forward path has at least one switched capacitor (10) controlled by a clock signal, thus providing an amplification phase (1) of the forward path and an additional clock phase (2). A damping means (22) is connected... Agent: Cohen, Pontani, Lieberman & Pavane LLP

20090167431 - Class d amplifier having pwm circuit with look-up table: A class D amplifier includes a noise-shaping modulator, a pulse width modulator, and a pulse amplifier. The noise-shaping modulator receive a pulse code modulated (PCM) signal and produces an oversampled PCM signal. The pulse width modulator produce a pulse width modulated (PWM) signal from the oversampled PCM signal. The pulse... Agent: Sterne, Kessler, Goldstein & Fox P.l.l.c.

20090167432 - Instrumentation amplification with input offset adjustment: In a single-ended or differential instrument amplifier, an input offset may be adjusted by driving current into the impedance of a feedback network of the amplifier. The amplifier may be provided with programmable gain capability. The impedance does not change with different gain settings, such that the input offset adjustment... Agent: Varian Inc. Legal Department

20090167433 - Audio apparatus: An audio apparatus includes an input, a first resistor, a first capacitor, an amplifier, a second resistor, a second capacitor, and an output. The input is used for inputting audio signals. The first resistor and the amplifier are serially connected to the input; wherein the first resistor is connected to... Agent: PCe Industry, Inc. Att. Steven Reiss

20090167434 - Device, system, and method of semi-doherty outphasing amplification: Device, system, and method of semi-Doherty outphasing amplification. For example, an apparatus includes: a first circuit path comprising a first switching amplifier connected in parallel through a first quarter-wave transmission line to a second switching amplifier; and a second circuit path comprising a third switching amplifier connected in parallel through... Agent: Shiloh Et Al.

20090167435 - Power control circuit and power control method: A power control circuit includes: a fine adjustment variable amplifying unit configured to amplify the input signal in accordance with a first gain set value; a coarse adjustment variable amplifying unit configured to amplify the input signal in accordance with a second gain set value; a branching unit configured to... Agent: Katten Muchin Rosenman LLP

20090167436 - High-efficiency switching power amplifiers with low harmonic distortion: In one embodiment, a switching power amplifier is provided that includes: a power switch coupled between a power supply node and ground, wherein the power switch is configured to be cycled on and off responsive to an input signal voltage; and a matching network coupled between a terminal of the... Agent: Haynes And Boone, LLPIPSection

20090167437 - Common mode feedback circuit supporting dual data rate, programmable gain amplifier having the same, and image sensor having the programmable gain amplifier: A common mode feedback circuit includes a first capacitor connected between a common mode feedback terminal and a first output terminal, a second capacitor connected between the common mode feedback terminal and a second output terminal, a first cell having a third capacitor sharing charges with the first capacitor and... Agent: F. Chau & Associates, LLC

20090167438 - Harmonic tuned doherty amplifier: Disclosed is a Doherty amplifier which includes a carrier amplifier for always performing a signal amplification operation regardless of a level of an input signal, a peaking amplifier for performing an amplification operation, starting from a high power output where a level of an input signal is equal to or... Agent: Blakely Sokoloff Taylor & Zafman LLP

20090167439 - Amplifier and the method thereof: An amplifier amplifying an input signal and the method thereof. The amplifier comprises an impedance matching network and a transconductor amplifier. The impedance matching network receives the input signal to perform impedance matching thereon, and comprises a first resistor, a first transistor, and a second resistor. The first resistor, receives... Agent: Thomas, Kayden, Horstemeyer & Risley, LLP

20090167440 - Low noise amplifier: The invention also describes a method of compensating for process variations in an output of an amplifier which comprises producing a reference signal dependent on the difference between a reference value and an actual value and switching one or more resistors into the output of the amplifier to adjust the... Agent: Sterne, Kessler, Goldstein & Fox P.l.l.c.