Amplifiers inventions 02/07

20070040607 - Switched capacitor amplifier with higher gain and improved closed-loop gain accuracy: A switched capacitor CMOS amplifier uses a first stage non-inverting CMOS amplifier driving a second stage inverting CMOS amplifier. The first stage amplifier is provided with positive feedback to substantially increase the gain of the first stage amplifier. In the described examples, the positive feedback is provided either by connecting... Agent: Edward W. Bulchis, Esq. Dorsey & Whitney LLP

20070040608 - Feedback controller for pwm amplifier: A feedback controller in a PWM amplifier comprises a signal input for receiving a pulse width modulated (PWM) input signal (Vin) whose duty cycle represents a desired analogue output signal. A feedback loop filter 518 generates a filtered error signal (Vint) comprising a filtered representation of differences between the input... Agent: Pearl Cohen Zedek, LLP Pearl Cohen Zedek Latzer, LLP

20070040609 - Low noise amplifier: Embodiments related to low noise amplification of electrical signals are presented herein.... Agent: Lee & Hayes, PLLC C/o Portfolioip

20070040610 - Automatic gain controller: An automatic gain controller includes a variable gain amplifier for amplifying an input signal having a specified DC level on the basis of the DC level, and outputting a first differential signal having a specified gain α, a second differential signal having a 180° phase difference from the first differential... Agent: Sughrue Mion, PLLC

20070040611 - Protection circuit of digital amplifier: A protection circuit of a digital amplifier includes a DC voltage detection circuit for detecting a DC voltage occurring in a loudspeaker output terminal; a control circuit for performing protection operation when the DC voltage detection circuit outputs a detection signal; and a midpoint potential detection circuit for detecting midpoint... Agent: Pillsbury Winthrop Shaw Pittman LLP

20070040612 - Push-pull amplifier with transformational negative feedback: The push-pull amplifier with transformational negative feedback is provided for amplification of variable electrical signals. It includes a signal input and a signal output, a transformational negative feedback connected with the signal input and the signal output and an amplifier circuit. The amplifier circuit includes an input and an output... Agent: Schiff Hardin, LLP Patent Department

20070040613 - Isolated stable bias circuit: A biasing circuit is described for a radio frequency (RF) amplifier that provides a stable signal source. The described bias circuit has two or more transistors coupled in at least one feedback loop, with a buffering transistor providing the output biasing signal and buffering the feedback loops from the output... Agent: Avago Technologies, Ltd.

20070035341 - Amplifier circuit having a compensating amplifier unit for improving loop gain and linearity: An amplifier circuit includes a feedback loop; a former stage amplifier unit coupled to an input node of the amplifier circuit and the feedback loop for amplifying the difference between an input signal received from the input node and an output signal which comes back through the feedback loop, and... Agent: North America Intellectual Property Corporation

20070035342 - Differential amplifier offset voltage minimization independently from common mode voltage adjustment: Offset voltages in differential amplifiers are minimized by controlling compensation currents through the load impedances of the amplifiers. The currents are varied while sensing the polarity of the offset voltage. When the polarity changes, the current values are latched to keep the offset voltage at a minimum.... Agent: Ibm Corporation

20070030058 - Amplifier comprising an electronic tube provided with collectors: An amplifier including an electronic tube with an axial electron beam, provided with a cathode and at least two collectors, and at least two sources of DC voltage. Each collector is connected to a DC voltage source having a potential difference such that, the further the collector is from the... Agent: C. Irvin Mcclelland Oblon, Spivak, Mcclelland, Maier & Neustadt, P.C.

20070030059 - 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, 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 Complementary Metal Oxide Semiconductor (CMOS)... Agent: Trask Britt, P.C./ Micron Technology

20070030060 - Apparatus and method for effecting signal chopping in an amplifier device: An apparatus for effecting signal chopping in an amplifier device having an amplifier section, a modulation section, a ramp generating section and a clock section includes: at least one signal treating unit coupled among the clock section, the amplifier section and the ramp generating section. The at least one signal... Agent: Texas Instruments Incorporated

20070030061 - Elimination of pop-up noise in class d amplifier: A class D amplifier includes a driver circuit and a reset circuit. The driver circuit is configured to amplify a PWM (pulse width modulation) signal to generate an amplified PWM signal. The reset circuit applies a predetermined voltage at an input of the driver circuit for a time period after... Agent: Law Office Of Monica H Choi

20070030062 - Matching device for an antenna and high-frequency receiver using the same: A high-frequency receiver has both interference characteristic and reception characteristic. The high-frequency receiver includes an electronic switch that is connected in parallel to input and output terminals of antenna amplifying circuit, and an antenna control unit that controls the electronic switch and an antenna amplifying circuit. When an antenna control... Agent: Ratnerprestia

20070030063 - Amplifier circuit: A circuit capable of improving communication quality. In this circuit, constant-envelope signal generating section (101) generates a first constant-envelope signal and a second constant-envelope signal from input signals (Si, Sq). Phase-shifter (102a) shifts the phase of the first constant-envelope signal by +α° and phase-shifter (102b) shifts the phase of the... Agent: Stevens, Davis, Miller & Mosher, LLP

20070030064 - Integrated laterally diffused metal oxide semiconductor power detector: An integrated LDMOS power detection circuit for radio frequency power detection is disclosed wherein the circuit includes a first LDMOS transistor, a first resistor coupled between the first LDMOS transistor and a power source, a second LDMOS transistor coupled to the first LDMOS transistor, a input resistive voltage divider and... Agent: Motorola, Inc.

20070030065 - Data processing method, pre-distortion arrangement, transmitter, network element and base station: A transmitter includes generating unit configured to generate a feedback signal and an analyzing unit configured to analyze transmission quality in a time domain and in a frequency domain by using the feedback signal. The transmitter also includes an adapting unit configured to adapt the pre-distorter if the transmission quality... Agent: Squire, Sanders & Dempsey L.L.P.

20070030066 - Data amplifying circuit controllable with swing level according to operation mode and output driver including the same: A data amplifying circuit for an output driver has a swing level that is controllable according to an operation mode. The data amplifying circuit includes a mode responding circuit supplying an additional source current to a source node of an amplifying circuit in response to a mode selection signal. The... Agent: Mills & Onello LLP

20070030067 - System for logarithmically controlling multiple variable gain amplifiers: A system for producing a control signal to a plurality of amplifiers sections to vary the gain of each one of the plurality of amplifier sections as a linear natural logarithmic function of an input gain control signal. The system includes a master circuit for producing a pair of currents... Agent: Siemens Corporation Intellectual Property Department

20070030068 - Non-feedback type load current controller: An electrical load is supplied with power from a driving power source, and a microprocessor (CPU) controls the opening/closing current supply rate (duty factor) of an opening/closing element in accordance with target current and driving power source voltage so that open loop control is carried out to achieve predetermined target... Agent: Sughrue Mion, PLLC

20070030069 - Differential amplifier: A differential amplifier comprises an operational amplifier, comprising a positive output terminal, a negative output terminal, and a feedback terminal; a common mode sensing circuit coupled to the positive output terminal and the negative output terminal, for generating a sensed common mode voltage of the positive output terminal and the... Agent: Thomas, Kayden, Horstemeyer & Risley, LLP

20070030070 - Amplifier circuit: An amplifier has a voltage to current converter coupled between a first potential and a reference potential and includes a control input coupled to a voltage at an input of the amplifier for converting the voltage at the amplifier input into a corresponding output current. A current multiplier is fed... Agent: Siemens Corporation Intellectual Property Department

20070030071 - Reconfigurable distributed active transformers: Reconfigurable distributed active transformers are provided. The exemplary embodiments provided allow changing of the effective number and configuration of the primary and secondary windings, where the distributed active transformer structures can be reconfigured dynamically to control the output power levels, allow operation at multiple frequency bands, maintain a high performance... Agent: Mr. Christopher John Rourk Jackson Walker LLP

20070030072 - Amplifying circuit having bias voltage setting mechanism: An amplifying circuit having a bias voltage setting mechanism includes: a first amplifying element that amplifies an input signal and outputs the amplified signal as an output signal; a bias voltage setting unit that generates a bias voltage from the output signal on the basis of a control signal, such... Agent: Beyer Weaver & Thomas, LLP

20070030073 - High frequency power amplifier circuit and radio communication system: Providing a high frequency power amplifier circuit and a radio communication system which can control output power by a power voltage, produce sufficient output power in high regions of demanded output power and improve power efficiency in low regions of demanded output power. In a high frequency power amplifier circuit... Agent: Reed Smith LLP

20070030074 - Zero cancellation in multiloop regulator control scheme: Control loops in a voltage regulator can be stabilized using minimal silicon area. A current limit signal, generated by a current limit control loop in the voltage regulator, can be divided to minimize a zero provided in a compensation set associated with a voltage control loop, thereby stabilizing both loops.... Agent: Bever Hoffman & Harms, LLP Tri-valley Office

20070030075 - Signal amplification apparatus and signal amplification method: A signal amplification apparatus which supplies an input signal to a signal processing section to perform signal processing on the input signal, amplifies a power supply voltage supplied from a power source section in accordance with the processed signal, and outputs the amplified power supply voltage. The apparatus includes output... Agent: C. Irvin Mcclelland Oblon, Spivak, Mcclelland, Maier & Neustadt, P.C.

20070030076 - Amplifier with active post-distortion linearization: An amplifier, which has good linearity and noise performance, includes first, second, third, and fourth transistors and an inductor. The first and second transistors are coupled as a first cascode pair, and the third and fourth transistors are coupled as a second cascode pair. The third transistor has its gate... Agent: Qualcomm Incorporated

20070030077 - Use of a thick oxide device as a cascode for a thin oxide transconductance device in mosfet technology and its application to a power amplifier design: A power amplifier power amplifier includes a transconductance stage and a cascode stage. The transconductance stage that is operable to receive an input voltage signal and to produce an output current signal. The transconductance stage includes a first Metal Oxide Silicon (MOS) transistor having a first gate oxide thickness and... Agent: Garlick Harrison & Markison

20070024353 - Characterizing amplitude and phase transfer response of amplifiers using single port measurements: Single port characterization of RF amplifier phase and amplitude transfer functions are developed by measuring the output of the amplifier as it is excited by a predetermined frequency over a series of bias steps. One bias step is chosen as a reference level. Amplitude characterization is obtained from measured magnitude... Agent: Agilent Technologies Inc.

20070024354 - Pwm digital amplifier with high-order loop filter: An improved PWM amplifier is disclosed that uses multiple integrators in the loop filter to provide high loop gain across the frequency band-of-interest. The frequency characteristics of the loop filter are optimized to distribute large loop gains across the entire band to provide large suppression of noise and distortions generated... Agent: Patent-trademark-copyright. Us

20070024355 - Pwm digital amplifier with high-order loop filter: An improved PWM amplifier is disclosed that uses multiple integrators in the loop filter to provide high loop gain across the frequency band-of-interest. The frequency characteristics of the loop filter are optimized to distribute large loop gains across the entire band to provide large suppression of noise and distortions generated... Agent: Patent-trademark-copyright. Us

20070024356 - Methods and apparatus of managing a power amplifier: In the present technique for power management of a power amplifier, an amplifier bank from a plurality of amplifier banks in a power amplifier that has been switched off for a longest period of time is assessed (826) to provide a lowest amplifier bank. With this lowest amplifier bank, an... Agent: Motorola, Inc.

20070024357 - Methods and apparatus of managing a power amplifier: In the present technique for power management of a power amplifier, it is first determined (314) whether a counter value corresponds at least in a predetermined way to a counter threshold, and if so, a current status of at least one amplifier bank from a plurality of amplifier banks in... Agent: Motorola, Inc.

20070024358 - Semiconductor power device and rf signal amplifier: A semiconductor power device comprises a flange, a die having a gate, a source, and a drain. The source is electrically coupled to the flange. A drain matching circuit is located on the flange having an input, an output and a bias input, the input being coupled with the drain.... Agent: Baker Botts L.L.P. Patent Department

20070024359 - Amplifier, filter using the same, and radio communication device: An amplifier includes an amplification unit which amplify a first difference between first and second input signals, a second difference between second and third input signals and a third difference between third and first input signals by a differential mode gain, and amplify an average of the first, second and... Agent: Amin, Turocy & Calvin, LLP

20070024362 - High reliability rf generator architecture: A scalable radio frequency (RF) generator system including at least one power supply, at least one power amplifier receiving input from the power supply, and a power supply control module, and a system controller. Output from the at least one power supply can be combined and applied to each of... Agent: Harness, Dickey & Pierce, P.L.C

20070024360 - Power supply providing ultrafast modulation of output voltage: A power supply for providing a modulated output voltage to a load is disclosed. According to various embodiments, the power supply comprises a plurality of parallel-connected switch-mode power modules and a controller. The controller is connected to each of the power modules and is for controlling the duty cycles of... Agent: Kirkpatrick & Lockhart Nicholson Graham LLP

20070024361 - Systems for pseudo-bd modulation: An amplifier system in accordance with an aspect of the present invention comprises a switching amplifier that drives a load with a pulse-width modulated (PWM) output signal that varies between first and second rails based on a first control input signal, and a common mode supply that provides a switching... Agent: Texas Instruments Incorporated

20070024364 - Amplifier and amplification method: An amplifier having an increased the upper limit on the amplitude of an audio signal generated between one common terminal and the output terminals of left and right channels without raising the power supply voltage. The level at common terminal C is changed corresponding to the average of the input... Agent: Texas Instruments Incorporated

20070024363 - Apparatus and method for generating internal voltage adaptively from external voltage: Provided are an apparatus and method for generating an internal voltage adaptively with respect to an external supply voltage. The apparatus includes a class detector and an internal voltage generator. The class detector outputs detection signals indicating a class of a plurality of classes, which correspond to predetermined voltages, to... Agent: F. Chau & Associates, LLC

20070024365 - Class-d amplifier system: A Class-D amplifier system may include an input stage that includes an Nth order filter, where N>1. The input stage filters an input signal to provide a filtered output signal, an input of the input stage being configured to receive the input signal as a digital pulse-width-modulated (PWM) signal. A... Agent: Texas Instruments Incorporated

20070024366 - Summing comparator for higher order class d amplifiers: The summing comparator includes: a first integrator; a second integrator for receiving an output of the first integrator; and a comparator for switching when the output of the first integrator is greater than the output of the second integrator. The outputs of the first and second integrators are directly compared... Agent: Texas Instruments Incorporated

20070024367 - Operational amplifier and constant-current generation circuit using the same: Provided in a constant-current generation circuit is an OP AMP which includes a bias circuit, differential stage and amplification stage. In the OP AMP, a capacitance is provided between a control terminal which receives a start-up signal EN and a node NGATE. In a start-up operation of the circuit, the... Agent: Nixon Peabody, LLP

20070024368 - Differential amplifiers with enhanced gain and dynamic range: Differential amplifier embodiments are provided for amplifying input signals with enhanced gain and dynamic range. They include first and second amplifier stages and at least one common-mode feedback circuit that is arranged to mirror and adjust a tail current to control the common-mode level of a respective one of the... Agent: Koppel, Patrick & Heybl

20070024369 - Current-controlled cmos (c3mos) wideband input data amplifier for reduced differential and common-mode reflection: Current-controlled CMOS (C3MOS) wideband input data amplifier for reduced differential and common-mode reflection. A novel solution is presented by which better impedance matching and extended bandwidth providing improved gain at higher frequencies may be achieved at the interface between silicon and package and/or circuit board within various integrated circuits that... Agent: Garlick Harrison & Markison

20070024370 - Power amplifier capable of adjusting compensation for distortion in amplification and communication apparatus employing the same: A variable impedance circuit includes a capacitor and a MOSFET and is connected between the base of a bipolar transistor and a ground node. The capacitor acts to the open for a direct-current component. The MOSFET varies impedance for an alternate-current component. A base voltage ration portion includes first and... Agent: Birch Stewart Kolasch & Birch

20070024371 - High frequency power amplifier: A high frequency power amplifier includes: a multi-finger transistor including transistor cells electrically connected in parallel; an input side matching circuit connected to gate electrodes of the transistor cells; and resonant circuits, each resonant circuit being connected between a gate electrode of a respective one of the transistor cells and... Agent: Leydig Voit & Mayer, Ltd

20070024372 - Method and apparatus for controlling a power amplifier supply voltage: A method for controlling a supply voltage for a radio frequency power amplifier, that includes the steps of: determining (210) at least one parameter; determining (220) a constant voltage based on the at least one parameter; and automatically adjusting (230) the supply voltage to the constant voltage.... Agent: Motorola, Inc.

20070024374 - Output match transistor: A power transistor, having: a semiconductor having an electrode formed thereon, wherein the electrode comprises a plurality of interdigitated transistors each having input and output terminals; a first output blocking capacitor having a first terminal electrically coupled to the output terminals of the interdigitated transistors of the semiconductor and a... Agent: Baker Botts L.L.P. Patent Department

20070024375 - Radio frequency amplification apparatus: An intermodulation distortion which is output from a final-stage amplifier 15 is fed back to an inter-stage matching circuit 14 via a first control circuit 16 and a second control circuit 17. The first control circuit 16 and the second control circuit 17 control an amplitude and a phase of... Agent: Mcdermott Will & Emery LLP

20070024376 - Radio frequency power amplifier module: An object of the present invention is to provide a radio frequency power amplifier of multi stage amplifying method that is designed to reduce instability of output power caused by electromagnetic coupling of bias supply terminals and interconnections of each stage to thereby operate stably. Another object of the present... Agent: Reed Smith LLP

20070024373 - Uhf active antenna amplifier for digital video broadcast (dvb) receiver and related dvb device: An active UHF amplifier includes a transistor having a base for receiving signals, a grounded emitter, and a collector for outputting signals, a first inductor having a first end for coupling to a voltage source, the inductance of the first inductor being between 10-100 nano-Henries, a first capacitor having a... Agent: North America Intellectual Property Corporation

20070024377 - Impedance matching techiques for multi-band or wideband rf amplifiers and associated amplifier designs: Multi-band or wideband impedance matching in RF amplifiers is disclosed, using variable negative feedback. The feedback is provided by variable impedance connected between the input and output terminals of an inverting amplifier, which may be single-ended, or differential. The variable impedance is used in conjunction with a fixed input impedance... Agent: Motorola, Inc.