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| Number | Title | Issue Date |
| 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 second amplified signal based on the first and second analog signals,... | 09/06/2011 |
| 7969242 | Switching power amplifier for quantized signals An apparatus and method for communications are disclosed. The apparatus may include an a quantizer having three levels, and a switching power amplifier configured to drive a load having first and second terminals, wherein the switching power amplifier is further con... | 06/28/2011 |
| 7965141 | Class D audio amplifier A class D amplifier (1) comprises an input unit (11) for receiving a digital input signal (Vin), a pulse shaping unit (12) for producing pulse shaped signals in dependence of the input signal (Vin), a comparator unit (13) for comparing th... | 06/21/2011 |
| 7961047 | Switching amplifier An amplifier having at least one switch controlled by an output voltage of a hysteresis block, wherein the hysteresis block is adapted to receive an input voltage signal based on an integration of an error signal, a low threshold voltage and a high threshold voltage... | 06/14/2011 |
| 7893764 | Power amplifier and common mode choke coil apparatus Common mode choke coil device includes four coils wound on a core in a same direction. Hot-side outputs of first and second class-D amplifiers are connected to respective ones of first ends of two of the four coils, and first and second hot-side output terminals are... | 02/22/2011 |
| 7889001 | Systems and methods of reduced distortion in a class D amplifier Systems and methods for reduced distortion in a class D amplifier are provided. An “ideal” digital output signal is produced. The “ideal” digital output signal is then compared to the actual output signal in an error amplifier. The integrator input is the di... | 02/15/2011 |
| 7884670 | Class D amplifier A Class D amplifier includes a ramp generator configured to generate a first signal and a second signal. Each of the first signal and the second signal oscillate between a minimum value and a maximum value. A signal generator is configured to receive an input signal... | 02/08/2011 |
| 7646240 | Class D amplifier A Class D amplifier includes a ramp generator that generates a ramp signal and an inverted ramp signal. A signal generator generates first, second, third and fourth signals by comparing the ramp and inverted ramp signals to an input signal. A frequency of the ramp s... | 01/12/2010 |
| 7633339 | Differential amplifier An amplifier comprising an analog amplifier which outputs a first current and a second current. The amplifier also comprises a first digital amplifier coupled to the analog amplifier, the first digital amplifier amplifies a modified version of the first current to p... | 12/15/2009 |
| 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 the comparator unit. In one embodiment of the present invention, at le... | 04/28/2009 |
| 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 units that couple a negative and a positive noise component extracted ... | 03/24/2009 |
| 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 a second voltage. The amplifier includes a first set of superconducti... | 12/23/2008 |
| 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 comparing the first and second reference signals to an input signal. The sig... | 12/23/2008 |
| 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 an amplification subsystem for receiving a digital audio signal and p... | 10/14/2008 |
| 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 circuit applies a predetermined voltage at an input of the driver circ... | 10/07/2008 |
| 7429890 | PWM digital amplifier with high-order loop filter An improved PWM amplifier is disclosed that uses multiple integrators in the loop filter to provide high loop gain across the frequency band-of-interest. The frequency characteristics of the loop filter are optimized to distribute large loop gains across the entire ... | 09/30/2008 |
| 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 detector provides an amplitude signal according to the absolute signal le... | 09/23/2008 |
| 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 constructed to include a pulse-width-modulator (PWM) (24 | 09/16/2008 |
| 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 output stage of the audio amplifier. The feedback circuit turned off ... | 08/26/2008 |
| 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 speaker being connected to the node via an output filter comprising an i... | 08/26/2008 |
| 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 control voltage for controlling a common mode voltage of the stage, a d... | 08/19/2008 |
| 7411448 | Class-D amplifier A PWM circuit converts output data of a calculator to a pulse width modulation signal, and outputs it to a load (speaker) through a buffer amplifier and a low-pass filter. A digital low-pass filter has the same filter characteristic as a low-pass filter. An error ca... | 08/12/2008 |
| 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 input signal. The dynamic PWM controller transforms the N-bit input sign... | 08/12/2008 |
| 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 comparison circuit (2), an integrating circuit (7), a dri... | 07/29/2008 |
| 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 clock frequency of a pseudo-random number generator so that the clock si... | 07/15/2008 |
| 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 stage with a variable dV/dt; and a mode control circuit for setting an ... | 07/01/2008 |
| 7394314 | 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 serial input into a switched output signal. The filter is operably coupled... | 07/01/2008 |
| 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 output means (OM) is coupled to at least one of said at least one inpu... | 06/24/2008 |
| 7388425 | PWM digital amplifier with high-order loop filter An improved PWM amplifier is disclosed that uses multiple integrators in the loop filter to provide high loop gain across the frequency band-of-interest. The frequency characteristics of the loop filter are optimized to distribute large loop gains across the entire ... | 06/17/2008 |
| 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 the second output signal has a second duty cycle; when the input signal... | 06/17/2008 |
| 7385444 | Class D amplifier The class D amplifier comprises a voltage control current source circuit for current-converting the voice voltage signal Vsin of the input into two signals with different polarities, two capacitance elements for integration where the electric charges of the each cur... | 06/10/2008 |
| 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 components between said inverted channels and said non inverted channels... | 06/03/2008 |
| 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 can be constructed to include a pulse-width-modulator... | 05/27/2008 |
| 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 stage is configured to receive the input signal and provide a level-shift... | 05/27/2008 |
| 7372333 | Monolithic supply-modulated RF power amplifier and DC-DC power converter IC Embodiments of RF power amplifiers are disclosed that include switched-mode power amplifiers supplied by synchronous buck DC-DC converters. The switched-mode power amplifiers can be used to amplify a limited form of an RF input signal and the supply to the switched-... | 05/13/2008 |
| 7368986 | Power amplifier with low power distortion at output A digital/analog amplifier includes the following coupled in series: a pulse-width modulator, a control circuit, a power inverter and a filter. The power inverter comprises two transistors series-connected between a power supply terminal and a ground of the amplifie... | 05/06/2008 |
| 7362254 | Systems and methods for minimizing delay in a control path Systems and methods for minimizing delay in a feedback path. In one embodiment, an analog-to-digital feedback path includes an analog-to-digital converter (ADC) configured to receive and digitize an analog signal such as an amplifier output to produce a serial digit... | 04/22/2008 |
| 7362082 | Switch mode power supply with output voltage equalizer A switch mode power supply for feeding a single ended class D amplifier, having. two voltage sources (1, 2) is disclosed. The power supply comprises a voltage equalizer circuit including a coil (10) having a first terminal connected to said common poin... | 04/22/2008 |
| 7355472 | Method and device for correcting signal distortions in an amplifier device The present invention provides a method for the correction of signal distortions in an amplifier device, wherein a digital PWM modulator is operated with a variable-frequency system clock. The present invention likewise provides a device for the correction of signal... | 04/08/2008 |
| 7355474 | Methods for reducing switching interference in switching amplifiers The present invention discloses a method for reducing switching interference in a switching amplifier. The switching amplifier includes a first half circuit having a first modulator and a first driver circuit, a second half circuit having a second modulator and a se... | 04/08/2008 |
