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Document Title |
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7629843 |
Parallel power amplifier and associated methods
A method and apparatus is provided for use in power amplifiers where multiple parallel power amplifiers provide various output power levels. By selectively enabling and disabling the parallel power...
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7630505 |
Loudspeaker system
There is provided a low-cost loudspeaker system which can adjust attenuation and provide protection against an excessive input. Between input terminals and a loudspeaker unit is provided a serial...
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7619478 |
Operational amplifier having its compensator capacitance temporarily disabled
An operational amplifier includes a differential amplifier connected between an input and an output port of the operational amplifier, a phase compensator capacitance connected between the...
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7616055 |
Transmitter apparatus with extended gain control
A transmitter includes a first variable gain amplifier (VGA) and a second VGA coupled to an output of the first VGA. The first and second VGAs each comprise a plurality of parallel gain stages....
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7616054 |
Multiple output power mode amplifier
A multi-mode power amplifier and an electronic device including the amplifier are described.
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7612607 |
Small size power amplifier with amplifiers switched
A small size power amplifier includes a first amplifier provided for a first signal path; a second amplifier provided for said first signal path; and a third amplifier provided for a second signal...
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7605648 |
Power amplifier
A power amplifier according to the present invention is operated by switching a main power amplifier and a subsidiary power amplifier. The idle current of the subsidiary power amplifier is smaller...
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7602927 |
Guitar amplifier with channel-dedicated power switching
An amplifier for electric guitar including a plurality of foot switch selectable preamplifier channels which can be set to provide differing sonic characteristics, and also including a power...
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7602237 |
Amplifying circuit
In an amplifying circuit, a first and a second switches are provided between an input terminal and output terminal of coupling capacitor and amplifier, and these switches are set in OFF state in a...
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7602238 |
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...
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7598804 |
Amplifier circuit
There is provided an amplifier circuit including a plurality of unit amplifiers connected in parallel to an input signal terminal, wherein each of the unit amplifiers includes: a first switch...
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7598807 |
Differential amplifier circuit, voltage regulator using the differential amplifier circuit, and method for controlling the differential amplifier circuit
A differential amplifier circuit, a voltage regulator using the differential amplifier circuit, and a method for controlling the differential amplifier circuit. The circuit includes a differential...
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7598808 |
Gigabit ethernet transceiver with analog front end
Circuitry to remove switches from signal paths in integrated circuit programmable gain attenuators. Programmable gain attenuators and programmable gain amplifiers commonly switch between signal...
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7589588 |
High-frequency power amplifier and radio communication equipment using the same
A high-frequency power amplifier comprising: a plurality of power amplifiers arranged in parallel; an inductance element inserted in series in an input signal line of said each power amplifier; an...
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7589589 |
Power amplifying apparatus and mobile communication terminal
A power amplifying apparatus includes an input terminal configured to receive an input signal, a first power amplifier biased for class A or class AB operation which is configured to amplify the...
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7586372 |
Programmable gain-frequency profile amplifier
A programmable gain-frequency profile amplifier is disclosed that includes a first gain amplifier amplifying an electrical signal based on a first gain-frequency profile, and one or more second...
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7583139 |
Power-efficient automatic gain control
A multi-stage amplifier configured for processing a received baseband signal comprises a plurality of fixed-gain amplifier stages and an automatic gain control (AGC) module. Each amplifier stage...
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7579909 |
Bypass circuit for radio-frequency amplifier stages
An amplifier circuit includes an amplifier and a phase shifter coupled in parallel to the amplifier and switchable such that the phase shifter has a first impedance for an alternating signal in an...
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7576587 |
On-chip source termination in communication systems
A communication system includes an integrated circuit (IC) die having an on-chip source termination. The on-chip source termination can be a non-precision resistor, such as an unsilicided poly...
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7565116 |
High frequency module
A high frequency module comprises a layered substrate. Inside the layered substrate, a reception diplexer for processing reception signals and a transmission diplexer for processing transmission...
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7564302 |
Method and system for gain control and power saving in broadband feedback low-noise amplifiers
Methods and systems for gain control and power saving in broadband feedback low-noise amplifiers are disclosed and may include controlling gain, power and/or a noise figure by selectively enabling...
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7554394 |
Power amplifier circuit
In a third operation in an amplifier, in which first and second amplifier circuits amplify a input signal, a distribution circuit adjusts the power of the signal supplied to the first amplifier...
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7554392 |
Multiple output power mode amplifier
A multi-mode power amplifier and an electronic device including the amplifier are described.
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7554390 |
Method and system for transitioning between operation states in an output system
A closed loop amplifier system comprising a modulator that provides a pulse-width modulated (PWM) output signal based on an input signal, the modulator having a variable closed loop transfer...
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7545220 |
Method for shaping signal pulses
The invention relates to a method and apparatus for shaping an input signal S on which is input to a multi-stage amplifier arrangement, to provide a definable output signal contour S off ....
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7538609 |
Amplifier, transmitter arrangement having an amplifier and method for amplifying a signal
An amplifier includes a signal input, a first, second and third amplification path. A coupling element having a first and a second output terminal is coupled to respective input terminals of the...
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7532066 |
Bias network with stable transient response
Embodiments of apparatuses, articles, methods, and systems for a bias network providing a stable transient response are generally described herein. Other embodiments may be described and claimed.
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7528657 |
Baseband filter start-up circuit
An electrical circuit comprises a plurality of amplifiers. Each of the plurality of amplifiers comprises an input circuit in communication with an input of the amplifier and a start-up circuit in...
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7518448 |
Amplifier mode switch
A power amplifier includes a main amplifier having a first output. An auxiliary amplifier has a second output coupled to the first output. A splitter splits a RF input into a first input provided...
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7518446 |
Multi-mode power amplifier with reduced low power current consumption
A multi-mode RF amplifier is disclosed having high and low output power modes composed of two power paths. When the multi-mode RF amplifier is biased into the high power, HP, mode, substantial...
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7519190 |
Circuit for reducing pulse noise caused at switching of an analog audio processing circuit
A noise reduction circuit for reducing pulse noise caused at switching of an analog audio processing circuit comprises a voltage division resistor circuit, an end of the voltage division resistor...
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7514994 |
Amplifier with high output power dynamic
The invention concerns an amplifier comprising a specific number of N active elements ( 11 to 1 N) coupled in parallel to a load impedance ( 2 ) via an adaptive device ( 3 ) including at least a...
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7515882 |
Apparatus, methods and articles of manufacture for a multi-band switch
The invention is directed to a multi-band switch having a transmitter switching section with a plurality of transmission ports, and a receiver switching section with a plurality of receiver ports,...
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7508259 |
Differential amplifier and data driver for display
Disclosed is a differential amplifier comprising first and second terminals for receiving signals; a third terminal for outputting a signal; first and second differential pairs, each having an...
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7508260 |
Bypassable low noise amplifier topology with multi-tap transformer
An amplifier is disclosed that contains a transistor (BJT), a switch (MOSFET), and a transformer. The collector of the BJT is connected to an end of the transformer while the base of the BJT is...
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7501893 |
Variable gain amplifier circuit
A variable gain amplifier circuit capable of eliminating circuit elements and the area for circuits when formed into an integrated circuit is disclosed. The circuit includes plural differential...
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7501887 |
Controllable amplifier and its use
A controllable amplifier is disclosed. The amplifier includes two current paths which couple an input to an output of the controllable amplifier. Each current path has a respective transistor which...
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7498877 |
Power amplifier with automatic switching function
A power amplifier with automatic switching functions is disclosed. The power amplifier can variably control output power of circuits as all of the circuits are operated when relatively large power...
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7498847 |
Output driver that operates both in a differential mode and in a single mode
An output driver of a semiconductor memory device that operates in a differential mode and in a single mode is disclosed. The output driver includes a current supplying circuit that operates as a...
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7495509 |
Audio power amplifier
A smart protection circuit to prevent possible circuit malfunction or damage due to sudden power source voltage fluctuation is introduced. In case of quick and large voltage fluctuation in power...
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7489191 |
Circuit and method for reducing bias noise in amplifier circuits
An amplifier circuit and method for reducing bias noise is disclosed. The amplifier circuit includes a passive biasing source for supplying a desired bias signal to the amplifier and an active...
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7486133 |
Transmitting output stage with adjustable output power and process for amplifying a signal in a transmitting output stage
In one embodiment of a transmitting output stage, a first controllable amplification device with a first amplification factor and a second amplification device with a second amplification factor...
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7486136 |
Power amplifier
A power amplifier has at least a first amplifier circuit with an output port and at least a second amplifier circuit with an output port. The power amplifier further has at least a coupler with a...
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7486135 |
Configurable, variable gain LNA for multi-band RF receiver
A configurable LNA architecture for a multi-band RF receiver front end comprises a bank of LNAs, each optimized to a different frequency band, wherein each LNA has a configurable topology. Each LNA...
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7486132 |
Variable capacitor circuit and integrated circuit containing the same
A variable capacitance circuit includes a MOS capacitor, and an application voltage switching section configured to change an application voltage to the MOS capacitor to change a capacitance of the...
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7486134 |
High efficiency load insensitive power amplifier
An advanced balanced RF power amplifier circuit is provided. The RF power amplifier has a pair of RF amplification paths constructed to efficiently operate in a high-power mode. When instructed to...
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7482866 |
Audio system with power-on/off noise suppression and audio amplifier thereof
An audio system with power-on/off noise suppression and an audio amplifier thereof are disclosed. The audio system includes a front stage circuit and an audio amplifier. The front stage circuit is...
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7479827 |
Multi-mode power amplifier with high efficiency under backoff operation
A multi-mode RF amplifier is disclosed having high and low output power modes and two power paths. A first RF amplifier delivers power to both paths. When the multi-mode RF amplifier is biased into...
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7477101 |
Fast charge circuit for use in amplifiers
According to an exemplary embodiment, an amplification module includes a bias circuit coupled to an input of an amplifier, where the bias circuit is configured to charge the input of the amplifier...
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7471154 |
Bias circuit for maintaining high linearity at cutback power conditions
To improve operation during cutback power mode by reducing gain expansion, sections of a multi-section amplifier are selectively biased. During cutback power condition, fewer than all sections of...
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