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8185067 |
Modulation method and apparatus
A modulation circuit for use in a radiofrequency transmitter includes a local oscillator circuit configured to generate one or more local oscillator signals at a desired frequency and with a duty...
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8174333 |
Power-efficient spectrum shaping for a magnetic link
Various embodiments relate to a transmission circuit and related method of shaping the transmission spectrum of a carrier signal. The transmission circuit may comprise a plurality of switching...
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8174311 |
Switching amplifier
A switching amplifier (200; 300; 400; 500) comprising: a switch (202; 302) configured to electrically connect and disconnect a first pin (202a; 302a) of the switch (202; 302) to a second pin (202b;...
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8164382 |
Concept, method and apparatus of improved distortion switched-mode amplifier
Systems and methods for switched-mode amplifiers having improved harmonic distortion are disclosed. High order in-band filtering is enabled without undue trade-off of distortion due to...
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8164381 |
Open-loop line driver control method and apparatus
According to an embodiment, a circuit includes an amplifier and an open-loop control system. The amplifier has an output stage for amplifying a signal, a power supply for driving a supply voltage...
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8154357 |
Modulation for amplitude-modulating a signal
Modulators for amplitude-modulating signals defined by phase information and envelope codes are provided with first transistors for receiving the phase information and second transistors for...
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8154358 |
System and method of changing a PWM power spectrum
In a particular embodiment, a circuit device includes a pulse edge control circuit to receive at least one pulse-width modulated (PWM) signal from a PWM source. The pulse edge control circuit is...
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8149061 |
Class H amplifier
A class H amplifier circuit includes a Buck converter 20 and a charge pump 30 which are used to generate voltages which are used in turn to power an output driver 10. A feedback path 36 controls...
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RE43265 |
Reduced output topology for multi-reference switching amplifiers
A method and attendant circuitry reduces the number of regulatory and switching devices in a multi-reference switching amplifier. In the preferred embodiment, multiple independently-modulated...
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8138827 |
Filter compensation for switching amplifiers
Embodiments of the present invention provide methods and systems for limiting bipolar current flow in a switching amplifier. Embodiments of the present invention are directed to a multi-referenced...
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8139792 |
Amplifier circuits, methods of starting and stopping amplifier circuits
An amplifier circuit (100) has an input stage (OP1) and an output stage (Q1, Q2) operating with different supply voltages and different quiescent voltages. The output stage has a feedback input...
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8135145 |
Multi-level output signal converter
The present invention discloses a multi-level output signal converter, which is connected to an audio amplifier. The audio amplifier comprises a comparing/measuring device, an encoder and an output...
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8115542 |
Variable frequency class-D amplifier, control method thereof, and ramp generator therefor
A class-D amplifier includes a ramp generator to provide a ramp signal having a frequency varying with an audio input signal, and a modulator to convert the audio input signal to a pulse width...
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8115564 |
Systems and methods to minimize startup transients in class-D amplifiers
Systems and methods for minimizing startup transients in digital audio controllers that may result in audible artifacts in the output of an audio amplification system. One embodiment comprises a...
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8115543 |
Mixed-signal transmission circuit for switching power amplifiers
The invention relates to an upstream unit (1) for a switched power amplifier (2) for a high-frequency transmission circuit (16). The upstream unit (1) supplies a pulse-length modulated HF pulse...
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8115548 |
Apparatus and method for controlling distortions of amplifier
Disclosed are an apparatus and method for controlling output distortions of an amplifier. The apparatus for controlling output distortions of an amplifier, includes a compensation signal generator...
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8115540 |
Amplifying apparatus, method of output control and control program
To provide, for example, a pulse input type power amplifying apparatus that can be operated at low voltage and low power, effectively suppressing generation of harmonic component. The amplifying...
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8115541 |
Three-level half-bridge pulse-width modulation amplifier and method of driving the same
A three-level half-bridge PWM amplifier includes a PWM generator and an output stage. The PWM generator changes a width of a pulse at a first level or a second level according to amplitude of an...
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8111099 |
Multi-channel audio playback apparatus and method
A multi-channel audio playback apparatus including a channel interface, a first switching amplifier and a second switching amplifier is provided. The channel interface is used to receive...
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8111846 |
Low distortion switching amplifier circuits and methods
Embodiments of the present invention include switching amplifier circuits and methods. In one embodiment, the present invention includes a low distortion method of driving a switching amplifier...
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8100493 |
***WITHDRAWN PATENT AS PER THE LATEST USPTO WITHDRAWN LIST***
Liquid jet and printing apparatus for preventing the change of voltage in the drive signal
A liquid jet apparatus according to the present invention includes a plurality of nozzles, an actuator provided for each nozzle and connected to the respective nozzle, and a drive unit for applying...
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8098091 |
Method in the compensation of unlinearities in an amplifier, and uses of the method and the amplifier
In a method and an amplifier for the compensation of unlinearities e.g. of the class D type, wherein an audio signal is pulse-width modulated, e.g. with a carrier wave signal in the form of a...
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8081028 |
Systems and methods for improved over-current clipping
Systems and methods for implementing over-current protection in amplifiers are provided, including systems, methods and devices for specifying a clip level at which to clip an audio signal in...
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8081022 |
Data processing system for clipping correction
A device (100) for processing data, the device (100) comprising an integrator unit (103, 104) adapted for integrating an input signal (V1) and a correction unit (101, 102) adapted for correcting a...
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8076971 |
Sampling frequency reduction for switching amplifiers
The present invention is directed toward providing a system and method of reducing RF interference in switching amplifiers without degrading performance. In one embodiment, the sampling rate of...
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8072261 |
Power amplifier
A power amplifier based on EER technology or ET technology extracts an amplitude-modulated component from a modulated signal as an input signal which includes the amplitude-modulated component and...
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8067980 |
Pulse width modulation circuit and class-D amplifier comprising the PWM circuit
A pulse width modulation (PWM) circuit comprises a first integrator (g m1) with a first feedback capacitor (C1), a second integrator (gm1) with a second feedback capacitor (C2) and a comparator...
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8063697 |
Self-oscillating driver circuit
A self-oscillating driver circuit comprises a driver stage, a feedforward path which is coupled to an input of the driver stage, and a feedback path which couples an output of the driver stage to...
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8058927 |
Amplifier modulation method and apparatus
A signal is modulated by generating a pulse-width modulation signal and applying the pulse-width modulation signal to an input of a switched-mode amplifier. An output of the amplifier is coupled to...
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8049557 |
Self oscillating class D amplification device
An amplification device, comprising a device input receiving a device input signal, an amplifier unit comprising a zero crossing detector unit, an output filter and a lead-lag compensation network....
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8050423 |
Integrated circuit device and audio system
An n-channel integrated circuit device (n is an integer of 1 or greater) for muting an audio signal includes a control circuit configured to generate a control signal and a delayed control signal,...
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8044715 |
Method and system for increasing sampling frequency for switching amplifiers
The present invention is directed toward providing a system and method of reducing RF interference in switching amplifiers without degrading performance. In one embodiment, the sampling rate of...
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8044743 |
Method and apparatus for pulse position modulation
A method for reducing the transition rate of a pulse width modulated signal representing an original signal having a predetermined frequency range of interest and producing an output signal, the...
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8044714 |
Device and method for amplifying pulsed RF signals
Device and method are described for amplifying pulsed RF signals, comprising one or more transistors, each comprising a drain, a gate and a source. A device synchronizes the supply for the drain...
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8040181 |
Time delay compensation and pulse width correction
A system, method and apparatus is provided for pulse width correction in a power driver. In an embodiment, an apparatus includes an operational amplifier having an input and an output. The input of...
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8040180 |
Operational amplifier capable of compensating offset voltage
An operational amplifier capable of compensating offset voltage includes an input stage circuit having a positive input end, a negative input end, a first current output end, and a second current...
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8040184 |
Class-D amplifier
A class-D amplifier includes a differential integrator that integrates a difference between an input signal and a feedback signal to output an integration value signal, a pulse width modulation...
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8036695 |
Power control apparatus in mobile terminal
An apparatus for controlling power of a mobile terminal is provided. The apparatus includes a power conversion for providing a ground connection during a time interval if a power value is input for...
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8030994 |
Driver for an inductive load
A driver supplies an output voltage to an inductive load. The driver includes an input to receive a pulse width modulated control signal having a controllable duty cycle within a predetermined...
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8022757 |
Class D power amplifier
A class D power amplifier includes: a signal input terminal for receiving an analog signal; an analog signal processing unit for amplifying the analog signal; an integrating circuit for integrating...
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8022756 |
Output circuits with class D amplifier
Output circuits using pulse width modulation (PWM) and/or pulse density modulation (PDM) are described. In one aspect, a PWM output circuit includes a PWM modulator that operates based on a square...
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8018364 |
Control apparatus for a load supply device
A control apparatus for a supply device of a load, the supply device is of switching type and connected between a supply voltage and a reference voltage, the apparatus including a sigma-delta...
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8013768 |
Integrated upstream amplifier for cable modems and cable set-top boxes
An upstream amplifier is integrated on a substrate with a digital-to-analog converter (DAC) to form an integrated circuit. In an embodiment, a low-pass filter is also integrated on the substrate....
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8013677 |
One-sided switching pulse width modulation amplifiers
One-sided pulse width modulated (PWM) amplifiers are disclosed. An example amplifier includes an integrator to receive first and second analog signals, and to output a first amplified signal and a...
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8013675 |
Combiner-less multiple input single output (MISO) amplification with blended control
Multiple-Input-Single-Output (MISO) amplification and associated VPA control algorithms are provided herein. According to embodiments of the present invention, MISO amplifiers driven by VPA control...
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8013678 |
Hybrid feedback controlled oscillation modulator and switching power amplifier system
A Hybrid feedback Controlled Oscillation Modulator (HCOM) is disclosed, having a 1st feedback path from the output voltage of the switching stage and a second feedback path from the filter output,...
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8008969 |
Single supply class-D amplifier
Traditionally, switching amplifiers (i.e., class-D and class-G) with negative supply rails had issues with direct current (DC) power loss, included large external capacitors, had a comparative...
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8004368 |
Radio frequency amplifier with digital amplitude modulation and method for controlling the delivering of power
A digital amplitude modulator. The digital amplitude modulator is configured to modulate the amplitude of an input carrier signal based on input digital data and generate a corresponding output...
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7999610 |
Class D amplifier capable of setting restraint power
A Class D amplifier capable of setting restraint power is provided, which comprises: an audio amplification unit, a pulse width modulation (PWM) unit, a first pre-drive unit, a second pre-drive...
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7994853 |
Class-D amplifier with dual feedback loop
A class-D amplifier with dual feedback loop scheme has a gain adjusting circuit, a second-order integrator, two comparators, a logic circuit and an output driver. Two differential output terminals...
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