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7622988 |
Chopper-stabilized instrumentation amplifier for impedance measurement
This disclosure describes a chopper stabilized instrumentation amplifier. The amplifier is configured to achieve stable measurements at low frequency with very low power consumption. The...
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7619467 |
Modulated triangular wave amplifier
The invention is a power amplifier circuit for providing a signal acceptable for use in audio amplifiers or similar applications without requiring a stable power supply free from fluctuations. An...
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7616053 |
Power amplifier circuit and method for envelope modulation of high frequency signal
A power amplifier circuit includes: a transformer receiving a first signal and generating a transformed signal from the first signal; and a transistor receiving a second signal having a direct...
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7612608 |
Sigma-delta based Class D audio or servo amplifier with load noise shaping
An amplifier capable of driving an analog load is provided. The amplifier can be constructed and arranged to operate as at least one circuit selected from the group consisting of a class D...
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7609110 |
Filterless class-D speaker driver with less switching
Methods for designing a filterless class-D amplifier and driver are described herein. In the exemplary embodiment, a feedback loop is used to stabilize the filterless class-D amplifier. A pulse...
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7605653 |
Sigma-delta based class D audio power amplifier with high power efficiency
An amplifier capable of driving an analog load is provided. The amplifier comprises a sigma delta modulator (SDM), a pulse processing circuit, an output stage, and a feedback loop. The SDM produces...
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7602245 |
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...
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7589590 |
Circuit architecture having differential processing for use in half bridges and full bridges and methods therefore
Circuit architecture is disclosed that includes one or more half bridges, the one or more half bridges including signal processing circuitry including first and second inputs and one or more...
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7586370 |
Class D amplifier
The invention is directed to a class D amplifier. According to the class D amplifier, sound data applied to an input terminal is supplied through a compensation circuit to a PWM circuit, from which...
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7586369 |
Pulse modulation type electric power amplifier
A pulse modulation type electric power amplifier includes a pulse modulator that receives as input a clock and an input signal, and converts the input signal to a pulse train, an output control...
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7583138 |
System and method for controlling an error amplifier between control mode changes
A system and a method are disclosed for controlling an error amplifier between control mode changes. An error amplifier comprises a first stage that comprises a first current source and a second...
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7583137 |
Power supply compensation
The invention relates to an amplifier comprising amplification means (AM) comprising an input and an output,
said amplification means (AM) comprising a switching output stage delivering at least...
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7580532 |
Multi-channel pulse width modulation apparatus
Disclosed are multi-channel PWM (Pulse Width Modulation) apparatuses and methods for modulating PCM-based multi-channel audio signals read from an optical medium into PWM-based multi-channel audio...
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7579910 |
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 an low distortion method of driving a switching amplifier...
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7579908 |
Digital audio amplifiers, electronic systems, and methods
An embodiment of an electronic system includes a digital audio amplifier having a continuous time modulator adapted to generate a difference signal between an audio bitstream and a feedback signal,...
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7579907 |
Switching amplifier
A switching amplifier of the invention boasts of an enhanced SN ratio in its output and an increased amplitude limit value in its input signal. The switching amplifier has a quantized signal...
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7576606 |
Digital PWM amplifier having a low delay corrector
Systems and methods for performance improvements in digital switching amplifiers using a low delay corrector. In one embodiment, a digital pulse width modulation (PWM) amplifier includes a signal...
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7576605 |
Low power output stage
Power consumption of an output stage such as a class-D output stage may depend on the amplitude and the activity of the signal being output. Here, control signals may be generated to independently...
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7576604 |
All-digital class-D audio amplifier
An all-digital class-D audio amplifier and method of digitizing an analog signal comprises a pulse-width modulation (PWM) wave generator for generating a PWM wave; an interpolator for receiving an...
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7573328 |
Power amplifier
A power amplifier is disclosed. In one embodiment, the power amplifier is a Class-D Amplifier having a differential pulse width modulator is disclosed. The differential pulse width modulator has an...
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7570711 |
Quadrature LINC transmission method and apparatus
A quadrature LINC transmission system processes a baseband input signal for transmission as a linearly amplified RF signal. An in-phase LINC element processes an in-phase baseband signal into an...
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7570118 |
Thermal overload protection circuit and method for protecting switching power amplifier circuits
A thermal overload protection circuit and method for protecting switching power amplifier circuits provides protection against latch-up and other failures due to energy returned from an inductive...
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7564397 |
High slew rate amplifier, analog-to-digital converter using same, CMOS imager using the analog-to-digital converter and related methods
An amplifier, which may be used in a pipelined analog-to-digital converter, includes a first amplifier stage driving a second amplifier stage. At least one compensation capacitor is coupled to...
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7557744 |
PWM driver and class D amplifier using same
The objective of the invention is to provide a class D amplifier that can reduce aliasing noise. The class D amplifier has D/A converter 10 that operates at the first sampling frequency, and PWM...
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7557650 |
Electronic signal generator with modulated cyclic ratio, compensated for variations in its power supply voltage
A generator capable of supplying one or more output signals with a modulated cyclic ratio includes one or more formatting circuits each processing one input signal and one or more class D...
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7554409 |
Over-current protection circuit and method for protecting switching power amplifier circuits
An over-current protection circuit protection circuit and method for protecting switching power amplifier circuits provides protection against latch-up and other failures due to energy returned...
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7554391 |
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...
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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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7551028 |
Signal generators for current-mode three-level digital amplifiers
Apparatus having corresponding methods comprise: a first fixed current source to produce a first fixed current; a second fixed current source to produce a second fixed current; a first adjustable...
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7551022 |
Power supply compensation
The invention relates to an amplifier comprising amplification means (AM) comprising an input and an output, said amplification means (AM) comprising a switching output stage delivering at least...
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7548110 |
Power amplifier and method for reducing common noise of power amplifier
A power amplifier including a delta-sigma modulation module, a differential programmable dead-time-control module, and an output stage module is provided. The delta-sigma modulation module...
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7545207 |
Control circuit and method for a switching amplifier
In a control circuit and method for a high efficiency and low EMI switching amplifier, an input signal is compared with a reference signal to generate a comparison signal, and a control signal is...
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7541869 |
Feedback amplifier
A feedback architecture for a PWM switching audio amplifier is, capable of compensating the effects of the demodulation filter through at least two feedback paths of the voltage applied to a load...
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7541865 |
EER high frequency amplifier
An EER high frequency amplifier wherein the dynamic range of the gain can be widened by performing a predetermined control of a device in a high frequency amplifying part and thereby enhancing the...
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7541864 |
Power amplifier and pulse-width modulated amplifier
The invention relates to a power amplifier having a phase amplification path with a phase amplification stage within said phase amplification path. Here the phase amplification stage receives a...
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7538607 |
Class D amplifier
The invention is directed to a class D amplifier. According to the class D amplifier, sound data applied to an input terminal is supplied through a compensation circuit to a PWM circuit, from which...
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7535296 |
Class-E radio frequency power amplifier with feedback control
A Class-E power amplifier includes a choke and a switch connected in series between a source of a supply voltage and circuit ground and connected to an inductively coupled coil. An output node of...
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7528651 |
Noise free implementation of PWM modulator combined with gate driver stage in a single die
An integrated noise isolation circuit on a single silicon substrate die having a structural arrangement that minimizes noise. The integrated circuit including a noise sensitive circuit including an...
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7528650 |
Multi-channel digital amplifier, signal processing method thereof, and audio reproducing system having the same
A multi-channel digital amplifier system to generate a pulse width modulation (PWM) signal having a different switching frequency in each channel, and a signal processing method thereof. The...
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7525377 |
Method for controlling a linear power amplifier
A linear power amplifier filters an instantaneous input signal to generate a filtered input signal, combines the instantaneous input signal and filtered input signal to generate a modified drain...
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7518450 |
Digital amplifier
Recently, the use of class D audio amplifiers has become more and more widespread. In contrast to the generally employed class AB linear amplification technology, class D allows for improved...
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7518445 |
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...
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7518444 |
PWM feedback/feed-forward protection
Systems and methods for improving the stability of feedback and/or feed-forward subsystems in digital amplifiers. One embodiment comprises a digital pulse width modulation (PWM) controller. The...
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7518443 |
Amplifier circuit and method for reducing voltage and current noise
An amplifier circuit with current noise reduction employs first and second variable impedance devices between a signal source and an amplifier. A modulation frequency generator establishes a...
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7518442 |
Circuit and method for suppressing switching and supply-related errors in a PWM power stage by instantaneous per-pulse feedback
A class D amplifier is provided. The class D amplifier includes a modulator and a class D power stage. The modulator provides a PWM output signal to the class D power stage. For each pulse of the...
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7518441 |
Signal processor for use with a power amplifier in a wireless circuit
A signal processor has an input terminal and an output terminal for use in a wireless transmitter, for generating a radio frequency signal suitable for transmission, either with or without further...
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7515885 |
Communications signal amplifiers having independent power control and amplitude modulation
The present invention, generally speaking, provides methods and apparatus for producing an amplitude modulated communications signal, in which a constant-envelope carrier signal is modified in...
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7515646 |
Method and apparatus for reducing EMI emissions for data signals traveling over a data pathway
An improved data signal electromagnetic emissions system is provided for sending data signals over one or more data pathways. An original data signal is encoded into a set of sideband frequencies...
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7509102 |
DAC based switching power amplifier
A power amplifier for use in a transmitter includes a first transistor having an input, a first node and a second node, a second transistor having an input, a first node and a second node and a...
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7501886 |
Low distortion class-D amplifier
An amplifier that receives an input signal and outputs an amplified output signal includes an integration stage, a comparison stage, and a full bridge circuit. The integration stage is be used for...
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