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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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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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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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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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7573330 |
High efficiency digital power amplifier
A digital power amplifier (or power switching amplifier or power switch) for use in a digital transmitter includes a low impedance multi-stage driver circuit having a low impedance pre-driver and a...
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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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7554399 |
Protection circuit and method for protecting switching power amplifier circuits during reset
A protection circuit and method for protecting switching power amplifier circuits during reset provides protection against latch-up and other failures due to energy returned from an inductive load...
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7554398 |
Integration improvement technique for switching amplifiers
A method of synchronizing static or dynamic dissimilar output sampling rates of multiple outputs of an integrated switching amplifier uses the step of synchronizing dissimilar static or dynamic...
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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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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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7545212 |
Class ad audio amplifier
An amplifier includes an output for feeding a load, a voltage generator presenting very high linearity and very low output impedance, and a current source having its output connected to the output...
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7538611 |
Audio amplifier with high power and high efficiency
A Class D audio amplifier with output signals capable of being as high as the amplifier's supply voltage. The audio amplifier contains a comparator, a positive output stage, and a negative output...
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7528662 |
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...
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7528653 |
Class-D amplifier with noise-immunity feedback
A class-D amplifier includes a switching transistor section, a filter, an analog to digital converter, and a feedback module. The switching transistor section is operably coupled to convert a...
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7525378 |
Circuit for reducing crosstalk
The circuit contains an input signal unit, an amplifier unit, and a comparator unit, cascaded in the foregoing order. The circuit further contains a ramp generator unit providing a ramp signal to...
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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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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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7508263 |
Digital amplifying apparatus with noise reduction
A digital amplifying apparatus includes a positive-phase amplifier, an inverting amplifier, a pair of LPFs, a positive and a negative noise component extracting unit, and noise component coupling...
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7501889 |
Method and apparatus for implementing soft switching in a class D amplifier
The present invention provides lossless switching by configuring the output inductor so that the ripple current amplitude at load conditions results in small negative current during switching. The...
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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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7498881 |
Switching audio power amplifier and method for pop noise suppression
A switching audio power amplifier and a method for pop noise suppression. The switching audio power amplifier includes a pulse width modulation (PWM) signal generator for generating a PWM signal; a...
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7492219 |
Power efficient amplifier
An amplifier generates a tri-level output signal in response to an input signal that is pulse-width modulated. The amplifier is filterless and DC free. The amplifier includes an integrator, a...
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7492218 |
Digital amplifier apparatus and method of resetting a digital amplifier apparatus
A digital amplifier apparatus includes a gain-adjusting section operable to adjust a gain of a digital audio signal; a dither-superposing section operable to superpose a predetermined dither on the...
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7479829 |
Class D amplifier and infrared data receiving apparatus using the same
A class D amplifier includes: an amplifier circuit in which a high side switching element and a low side switching element are connected in series between power sources; a high side gate driving...
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7471144 |
Low distortion class-D amplifier
A low distortion class-D amplifier. The amplifier comprises a power supply terminal for receiving power, an amplification stage, and an output stage. The amplification stage receives an input...
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7468631 |
Class D amplifier
A Class D amplifier comprising a ramp generator that generates a first reference signal and a second reference signal. A signal generator generates first, second, third and fourth pulses by...
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7468630 |
Superconducting switching amplifier
A superconducting switching amplifier embodying the invention includes superconductive devices responsive to input/control signals for clamping the output of the amplifier to a first voltage or to...
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7466194 |
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...
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7463089 |
Class D audio power amplifier for mobile applications
A fully differential class D amplifier is provided. The class D amplifier includes an active amplifier in the feedback path of the modulator. In one embodiment, the class D amplifier includes a...
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7449948 |
Amplifier
PWM signals having different polarities input from a +IN terminal and a −IN terminal are output to a pre-driver and a switching signal generation circuit. The pre-driver outputs to switches a...
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7449947 |
Reduction of voltage spikes in switching half-bridge stages
A path configuration for a power switch and driver can introduce independent parasitic inductance coupled to the power switch to slow a switching speed of the switch and reduce voltage spikes on...
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7436255 |
Power supply feed forward analog input filter component mismatch correction
Systems and methods for minimizing errors due to component variation in switching amplifiers utilizing power supply feed forward techniques. One embodiment comprises a digital PWM amplifier having...
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7432759 |
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...
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7427893 |
Circuit and method for controlling the power mode a class-D amplifier
A circuit and a method for controlling the power mode of a class-D amplifier are provided. The power mode control circuit comprises an amplitude detector and a duration detector. The amplitude...
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7425864 |
Recovery from clipping events in a class D amplifier
A class AD audio amplifier system ( 10 ) with improved recovery from clipping events is disclosed. The amplifier system ( 10 ) includes multiple audio channels ( 20 ), each of which can be...
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7417504 |
Startup and shutdown click noise elimination for class D amplifier
A method of minimizing an audible click noise from a speaker in a Class D audio power amplifier upon shutdown or startup of a switching stage having two switches series connected at a node, the...
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7417503 |
Method for high efficiency audio amplifier
The present invention introduces methods and circuits to amplify audio signals for driving speakers. An additional feedback circuit is added in an audio amplifier to couple the amplifier stage and...
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7414471 |
Common-mode technique for a digital I/P class D loop
A closed loop amplifier adapted to be directly connected to a battery having a battery voltage for powering the amplifier. The amplifier includes an amplifier stage having a node for receiving a...
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7411447 |
Dynamic pulse width modulation amplifiers
A dynamic pulse width modulation (PWM) amplifier comprising an input terminal, a dynamic PWM controller, a power stage, a low pass filter, and an output terminal. The input terminal receives an...
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7405615 |
Method of impulse acreage modulation digital power processing and its device
The present invention relates to a method and apparatus of processing digital power with pulse area modulation. This apparatus is composed of a front end circuit ( 1 ), a double limit delay...
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7400194 |
Method of amplifying a digital signal and device therefor
An efficient method of amplifying a digital signal with reduced electromagnetic interference is disclosed. The invention applies an average amplitude detector to the input signal to control the...
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7394315 |
Gate driver for Class D audio amplifier with adaptive dV/dt control
Provided is a gate driver circuit for a Class D audio amplifier with adaptive dV/dt control. The circuit includes an output switching stage, a gate driver capable of driving the output switching...
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7391258 |
Self-oscillating power circuit
The invention relates to a self-oscillating circuit comprising comparator means (CM) comprising at least one input means (IM) and at least one output means (OM), at least one of said at least one...
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7388431 |
Switching amplifier and control method thereof
In a switching amplifier for generating a pair of output signals of square waves in response to an input signal, when the input signal is zero, the first output signal has a first duty cycle and...
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7382887 |
Method and device for reducing high frequency error components of a multi-channel modulator
A method and device for reducing error components of a multi-channel modulator. The method comprises the steps of inverting substantially half of the channels of a modulator, and reducing error...
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7378904 |
Soft transitions between muted and unmuted states in class D audio amplifiers
A class AD audio amplifier system ( 10 ) with reduced noise capability in muting and unmuting events is disclosed. The amplifier system ( 10 ) includes multiple audio channels ( 20 ), each of which...
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7378903 |
System and method for minimizing DC offset in outputs of audio power amplifiers
An amplifier system receives an input signal and generating therefrom an amplified output signal. The amplifier system is recited as comprising an input stage and an amplifier stage. The input...
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