Amplifiers inventions 04/08

20080094136 - Amplifier circuit and method of generating bias voltage in amplifier circuit: Provided are a differential amplifier circuit and a method of generating a bias voltage in a differential amplifier circuit. The differential amplifier circuit is turned on or turned off in response to an input voltage and includes a differential amplifier and a bias circuit. The bias circuit provides a first... Agent: Mills & Onello LLP

20080094135 - Dc offset mitigation in a single-supply amplifier: An amplifier is described which includes a first loop including a first amplifier stage having an offset voltage associated therewith. An output stage includes two switching devices in a bridge configuration configured to be coupled between a supply voltage and ground. An output of the bridge configuration is configured to... Agent: Beyer Weaver LLP

20080094137 - Power control and modulation of switched-mode power amplifiers with one or more stages: This invention controls and modulates switched-mode power amplifiers to enable the production of signals that include amplitude modulation (and possibly, but not necessarily, phase modulation), the average power of which may be controlled over a potentially wide range.... Agent: Michael E. Forgarty, Esq. Mcdermott Will & Emery LLP

20080094138 - Monotonic and voltage supply independent automatic gain control amplifier: A method and circuit are provided wherein the magnitude of an RF signal provided by RF circuit is used to derive a control set point of the RF circuit via an intermediate controller circuit. This controller circuit having the specific function of providing the actual voltage applied to the control... Agent: Kenyon & Kenyon LLP

20080094139 - Power amplifier with distortion compensation circuit: A power amplifier negates a memory effect and is applied a linearizer using a digital predistortion system even in an inexpensive device. The power amplifier compares an input signal power against a sampled component of an output power, and provides predistortion to the input signal power so as to minimize... Agent: Bingham Mccutchen LLP

20080094140 - Ratio-independent switched capacitor amplifiers and methods of operating ratio-independent switched capacitor amplifiers: A ratio-independent switched capacitor amplifier includes a first sampling circuit configured to sample a first input voltage as a first sampling voltage and to double a level of the first sampling voltage during an interval in which the first input voltage is cut off; a second sampling circuit configured to... Agent: Myers Bigel Sibley & Sajovec

20080094141 - High-frequency power amplifier: A high-frequency power amplifier has an FET element having a unit FETs in multifinger form, and having a gate pad through which a signal is input, a source pad that is grounded, and a drain pad through which a signal is output. A high-frequency processing circuit includes series resonance circuits... Agent: Leydig Voit & Mayer, Ltd

20080094142 - Power amplifier: A power amplifier amplifies an input signal having a fundamental frequency of which band width ranges between a first fundamental frequency F1 and a second fundamental frequency F2. The power amplifier includes a power amplifier transistor for amplifying the input signal and an output matching circuit for suppressing a harmonic... Agent: Mcdermott Will & Emery LLP

20080094143 - Dc coupled microwave amplifier with adjustable offsets: An output amplifier stage covers a flat frequency range of DC to microwave frequencies with provisions for independent control of input and output DC offset. The output amplifier stage includes a standard AC coupled microwave amplifier for high frequency performance. The AC coupled amplifier is intended for use as an... Agent: Martin C. Fliesler Fliesler Meyer LLP

20080088368 - Offset voltage correction for high gain amplifier: A method and an apparatus are described for an offset correction in a high gain amplifier. An embodiment of an amplifier circuit includes an amplifier to convert a current signal into a voltage signal, where the amplifier generates an offset voltage in the voltage signal. The amplifier circuit also includes... Agent: Blakely, Sokoloff, Taylor & Zafman LLP

20080088369 - Enhanced doherty amplifier with asymmetrical semiconductors: The present disclosures an amplification unit which comprises a first amplifier and a second amplifier connected in parallel, the first amplifier and the second amplifier comprising semiconductor devices that are not the same amplifier design. The present application also discloses a signal input line connected to the first amplifier and... Agent: Nortel Networks Limited

20080088371 - Method, apparatus and system for reducing dc coupling capacitance at switching amplifier: A digital amplifier, a reference voltage generator for reducing a DC component of an amplified pulse width modulated signal of a digital amplifier, and a method of reducing a DC component of an amplified pulse width modulated signal applied to an input node of a load are described in this... Agent: Harness, Dickey & Pierce, P.L.C

20080088370 - Method, apparatus and system for reducing noise from an amplifier: A digital amplifier, a noise reduction circuit and a method of reducing noise from an output signal of a digital amplifier are described in this disclosure. The digital amplifier includes a driving circuit for providing a driving signal, a filter for filtering the driving signal and providing the filtered driving... Agent: Harness, Dickey & Pierce, P.L.C

20080088372 - Subtractor circuit and operational amplifier: Disclosed herein is a subtractor circuit for outputting an output voltage as a difference between a first input voltage and a second input voltage. The subtractor circuit may include a first semiconductor element, a second semiconductor element, a third semiconductor element, a fourth semiconductor element, a fifth semiconductor element, and... Agent: Lerner, David, Littenberg, Krumholz & Mentlik

20080088373 - Differential amplifier using body-source cross coupling: Disclosed herein is a differential amplifier using body-source cross coupling. In a common gate differential amplifier in which common gate amplifiers are implemented in a differential structure, since the bodies of the common gate amplifiers are cross coupled to the sources of the opposite common gate amplifiers, it is possible... Agent: Oliff & Berridge, PLC

20080088374 - Variable gain amplifiers: Variable gain amplifiers with wider linear range are provided, in which first and second loads are coupled to a power voltage, and a transconductor cell comprises first and second transistors, a gain control transistor, and first and second current sources. The first and second transistors comprise control terminals receiving a... Agent: Thomas, Kayden, Horstemeyer & Risley, LLP

20080088375 - Class ad audio amplifier: a control stage (42) for controlling the current source (40) from the current (i1) delivered by the voltage generator (18). The control stage (42) for controlling the current source (40) includes current measurement elements (43) for measuring the current (i1) delivered by the voltage generator (18), which elements are disposed... Agent: Young & Thompson

20080088376 - High frequency power amplifier: A small, high performance high frequency power amplifier enables easily adjusting and switching the impedance. The high frequency power amplifier module includes a first semiconductor chip including one or a plurality of high frequency amplification devices, and a second semiconductor chip including one or more high frequency matching circuit devices... Agent: Ratnerprestia

20080088377 - Apparatus for and method of biasing a transistor: An apparatus for biasing a transistor, comprising: a controllable bias generator; a test circuit; a digital Mth order differentiator responsive to an output of the test circuit; and a controller responsive to the digital Mth order differentiator for controlling the controllable bias generator; wherein the test circuit is configured to... Agent: Wolf Greenfield & Sacks, P.C.

20080084244 - Method and system for linearizing the characteristic curve of a power amplifier: According to a method, a first signal is produced from a digital input signal by pre-emphasis and said signal is supplied, after carrier frequency translation, D/A conversion and modulation, to a power amplifier for producing a carrier-frequency output signal. IN order to linearize the characteristic curve of the power amplifier,... Agent: Staas & Halsey LLP

20080084245 - Operational amplifier: An operational amplifier and use of an operational amplifier is provided that includes an input differential amplifier, which is connected to a first input and to a second input and a differential output stage, which is connected to the input differential amplifier and a first output and a second output.... Agent: Mg-ip Law, Pllc

20080084246 - Bias circuit with increased power supply rejection: According to one exemplary embodiment, a power supply rejection bias circuit includes a first amplifier coupled to a second amplifier, where the first amplifier receives a reference voltage, and a feedback voltage of the bias circuit. The bias circuit further includes an output transistor driven by the output of the... Agent: Farjami & Farjami LLP

20080079486 - Amplifier circuit with multiple power supplies: An amplifier circuit that uses multiple power supplies includes a class D amplifier circuit, input bias generator and feedback network. By creating a voltage using the input bias generator at the non inverting terminal of the integrator, the inverting terminal of the integrator will follow the same voltage as the... Agent: Greenblum & Bernstein, P.L.C

20080079487 - Power amplifier: A power amplifier includes an amplification circuit, an input stage matching circuit, and an output stage matching circuit. The amplification circuit amplifies an input signal in each frequency band by an active element common to the signals in plural types of frequency bans, and outputs the amplified signal. The input... Agent: Oblon, Spivak, Mcclelland Maier & Neustadt, P.C.

20080079488 - Amplifier device with adjustable supply voltage: A radio-frequency power amplifier is supplied by a voltage supply device. The voltage supply device has a voltage divider chain that is connected at the input side with a base potential and a ground voltage. The voltage divider chain has a number of Zener diodes connected in series, with which... Agent: Schiff Hardin, LLP Patent Department

20080079489 - Power amplifier: Improved methods and systems for amplifying a signal are provided. Specifically, systems and methods for amplifying a signal through a lossy switch element tied to two or more voltage sources are provided. In the preferred embodiment, envelope information from the signal is used to smoothly transition between the two or... Agent: Stolowitz Ford Cowger LLP

20080079490 - Asymmetric rise/fall time and duty cycle control circuit: Modules and signal control circuits configured to at least partially compensate for or adjust for asymmetric rise/fall time. The circuit may include a first input node configured to receive a first data signal and a second input node configured to receive a second data signal that is complementary of the... Agent: Workman Nydegger

20080079491 - Differential amplifier circuit: Disclosed is a differential amplifier circuit that comprises: a first differential pair of a first conductivity type having an input pair connected to respective input terminals and an output pair connected to a load-element pair; a second differential pair of a second conductivity type having an input pair connected to... Agent: Mcginn Intellectual Property Law Group, PLLC

20080079492 - Differential amplifier: Connected to a differential transistor pair are a load current source and a tail current source. A bias circuit controls current generated by the load current source. A first self-bias switch is provided between a gate and a drain of a first input transistor; and a second self-bias switch is... Agent: Mcdermott Will & Emery LLP

20080079493 - Circuit and method for generating electrical solitons with junction field effect transistors: A circuit can include an amplifier having at least a first junction field effect transistor (JFET) of a first conductivity type with a source coupled to a first power supply node, and a drain coupled to an amplifier output node. A first variable bias circuit can be coupled between the... Agent: Haverstock & Owens, LLP

20080079494 - Broadband low noise amplifier: Aspects provide for the broadband amplification of RF signals. Other aspects provide for the conversion of single ended input to differential output. Various aspects provide for tuning the response to a particular frequency band. Other aspects provide for various transconductance elements. In several aspects, broadband current to voltage converters and... Agent: Carr & Ferrell LLP

20080079495 - Bias circuit and power amplifier: A bias circuit includes: a first transistor having a base terminal grounded via a resistor, and a collector terminal connected to a first power supply port via an adjustment resistor; a second transistor having an emitter terminal connected to the base terminal of the first transistor, and a base terminal... Agent: Harness, Dickey & Pierce, P.L.C

20080079496 - Amplifier containing programmable impedance for harmonic termination: An apparatus and method for eliminating unwanted signal power dissipation in balanced amplifier circuits and for prohibiting unwanted signal power from appearing at the balanced amplifier load is presented. Load impedances to the amplifier power output transistors are maintained very low at unwanted frequencies, and are at an operational impedance... Agent: Motorola, Inc

20080079497 - Low noise amplifier with embedded filter and related wireless communication unit: In one embodiment, a WCDMA FDD system includes an embedded filter that provides a complex load to transistors in a low noise amplifier. The complex load can be constructed using passive and/or active devices and creates an arbitrary transfer function that supports selective Q-enhancement of poles or zeros. One particular... Agent: Texas Instruments Incorporated

20080079498 - System and method for dc correction in wireless receivers: The present disclosure relates generally to systems and methods for direct current (DC) correction in wireless devices. In one example, a method includes setting a cutoff frequency of a filter at a first frequency, where a signal entering the filter is attenuated based on the cutoff frequency. If a qualified... Agent: Timothy F. Bliss

20080079499 - Power amplifier and method thereof: A power amplifier amplifying an input signal to generate an output signal, comprising a cascode unit and a bias circuit. The cascode unit comprises a cascode stage, a first input stage, and a second input stage. The cascode stage generates the output signal. The first input stage, in cascode with... Agent: Thomas, Kayden, Horstemeyer & Risley, LLP