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7583158 |
PWM signal generating circuit
A PWM signal generating circuit according to the invention includes a digital PWM signal generating circuit that generates a digital PWM signal having a resolution of 2n based on a clock signal CLK...
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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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7561002 |
Method and apparatus for frequency modulating a periodic signal of varying duty cycle
A method and apparatus for frequency modulating a PWM involves 1) generating a high frequency carrier signal much greater in frequency than the PWM signal; 2) modulating the high frequency signal...
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7557670 |
Circuit and method for generating a continuous pulse signal
The present invention discloses a circuit and method for generating a continuous pulse signal. The circuit of the present invention comprises: a PWM device generating a clock signal and a PWM...
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7532082 |
Synchronization circuit for synchronizing PWM modulators
A synchronization circuit for synchronizing at least two self-oscillating PWM modulators, each outputting a respective pulse-width-modulated output signal comprising signal pulses with signal pulse...
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7532141 |
Pulse width modulation method and digital analogue converter using the same
In a pulse width modulation method of the present invention, a digital signal is modulated and a pulse width modulation signal is generated in a pulse width modulator by using a digital signal...
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7505516 |
Ultra wide band (UWB) synchronisation search
An apparatus with ultra wide band (UWB) applications such as radar, position tracking and communications, for example Ground Penetrating Radar (GPR) and Wireless Personal Area Networking (WPANs)....
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7492233 |
Precision modulated controller output
A modulating controller for use in providing a precision modulating output is disclosed. An illustrative modulating controller may include a voltage regulator adapted to output a single reference...
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7486155 |
Circuit and method for pulse width modulation by means of synchronized, self-oscillating pulse width modulators
A pulse width modulator circuit has two self-oscillating pulse width modulators and a synchronization circuit for synchronizing the two self-oscillating pulse width modulators. It also comprises an...
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7479840 |
Digital pulse width controlled oscillation modulator
A pulse width modulator ( 10 ) for converting a digital signal into a PWM signal, comprising a plurality of integrators ( 11 ) with integrator gains ( 12 ) arranged in series, a comparator ( 17 )...
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7474168 |
Modulation-signal generator circuit, image display apparatus and television apparatus
A modulation-signal generator circuit generates a modulation signal having a time width corresponding to tone data that is input. The modulation-signal generator circuit includes an output section...
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7468639 |
Modulation circuit, driving circuit and output method
A modulation circuit that outputs modulation signals, comprising: a memory circuit that stores waveform data that determines the time width of a portion of a modulation signal, the portion being...
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7453250 |
PWM controller with dual-edge modulation using dual ramps
A dual-edge modulation controller including first and second ramp circuits, first and second comparators, an error amplifier and pulse control logic. The first ramp circuit provides a leading-edge...
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7446621 |
Circuit and method for switching PFM and PWM
The switching method between pulse frequency modulation and pulse width modulation signals is first based on an output voltage of a power transistor to generate a corresponding pulse frequency...
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7433403 |
Pulse width modulation method for a power converter
A pulse width modulation method has the steps of operating a second instruction signal so that each of the differences between two or three arbitrary instruction signals in three first instruction...
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7425853 |
Systems and methods for pulse width modulating asymmetric signal levels
Systems and methods for pulse width modulating waveforms to represent asymmetric signal levels using pulses that are symmetric within their respective switching periods. One embodiment comprises a...
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7394319 |
Pulse width modulation circuit and multiphase clock generation circuit
A pulse width modulation circuit comprises a multiphase clock generation section which generates multiphase clock signals based on a reference clock, and a pulse width modulation signal generation...
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7391280 |
Circuit and method for pulse width modulation
A circuit and a method for performing pulse width modulation are provided. A pulse density modulator (PDM) is applied to receive the least N bits of the input data and to generate a pulse density...
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7372902 |
Pulse with modulation signal generating circuit
A PWM signal generating circuit outputs a stable PWM signal for increasing and deceasing a duty ratio at a predetermined rate within a predetermined period without requiring an improvement of a...
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7327203 |
PWM signal generation circuit and PWM control circuit
A PWM signal generation circuit and a PWM control circuit are provided in which the duty ratio is easily changed and which can also avoid adverse impact from ambient temperature changes and the...
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7317758 |
PCM-to-PWM converter
The invention relates to a method and a device for converting a digital, pulse-coded signal (PCM) to a pulse-width-modulated signal (PWM), wherein the digital signal PCM, f(t) is multiplied by at...
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7307488 |
Method of estimating an intersection between at least two continuous signal representations
The invention relates to a method of estimating an intersection between at least two continuous signal representations (SR 1 , SR 2 ) in a pulse width modulator, at least one of said continuous...
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7301417 |
Pulse width modulation method and apparatus
Disclosed is a pulse width modulation method and apparatus capable of expressing as many values as possible in a pulse width modulation (PWM) period, while maintaining the center of pulse energy...
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7289005 |
Polar modulator and a method for modulation of a signal
A polar modulator contains a phase locked loop which is designed to emit a radio-frequency signal at one frequency to one output, with the frequency being derived from the reference signal and from...
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7283011 |
Method for performing dual phase pulse modulation
A modulation method, referred to as dual phase pulse modulation (DPPM), represents digital data as a series of high and low pulses whose widths represent groups of M data bits, with both the high...
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7268638 |
Apparatus and method for data rate multiplication
The invention is a method for pulse position modulating signals which are synchronized to clocked bit periods using a clock comprising the steps of generating two, three or n signals to mark the...
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7268639 |
Pulse width modulation circuit
The present invention provides a pulse width modulation (PWM) circuit comprising an PWM control circuit for setting an output signal to low when a logical level of a oscillation signal at a first...
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7266077 |
Serial digital communication system and method
A serial digital communication system includes a master device and a plurality of slave devices connected serially between the master device's output and input—thereby forming a closed chain....
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7248089 |
Method of establishing a PWM-modulated output signal representation
The invention relates to a method of establishing a PWM-modulated output signal representation (OS), providing a stream of parallelly determined intersection representations (PIR) on the basis of a...
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7200187 |
Modulator for digital amplifier
A digital modulator for driving a digital amplifier. The digital modulator has a subtractor which receives a digital input signal. A filter amplifier receives the output of the filter amplifier and...
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7200173 |
Method and apparatus for generating a distortionless pulse width modulated waveform
A technique to provide a distortionless and predictable real-time PWM waveform based on a sequence of combinations of programmed period and width values received from a processor. In one example...
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7170360 |
Device and method for digital pulse width modulation
The present invention provides a device for digital pulse width modulation with: (a) a filter device ( 11 ) for filtering a filter input signal ( 10 ″); (b) a quantization device ( 13 ) for...
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7158865 |
Current driver employing pulse-width modulation
A current driver capable of generating a controlled current in the form of a pulse-width modulation (PWM) signal suitable for controlling an electronic device such as a solenoid is disclosed. The...
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7130346 |
Method and apparatus having a digital PWM signal generator with integral noise shaping
A method and apparatus having a digital pulse width modulation generator with integral noise shaping is provided. The apparatus for generating a digital pulse width modulation signal includes a...
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7116916 |
Method and apparatus for compacting data in a communication network
A pulse width of a pulse having a nominal pulse width is modulated in accordance with a digital value to be communicated. The number of clock cycles that the modulated pulse width exceeds the...
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7078964 |
Detection of DC output levels from a class D amplifier
A class AD audio amplifier system ( 10 ) with DC output detection logic ( 26 ) is disclosed. The amplifier system ( 10 ) includes multiple audio channels ( 20 ), each of which includes a...
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7024223 |
Systems and methods for a multi-platform wireless modem
A standard interface for interfacing a wireless modem assembly with a host device comprises a primary serial interface, a secondary serial interface, and a differential serial interface for...
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7017069 |
PWM control circuit, microcomputer and electronic equipment
A PWM control circuit, microcomputer and electronic equipment which can generate high-resolution PWM signals through a small-sized scale of circuit. The PWM control circuit includes a PWM period...
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6998928 |
Digital pulse width modulation
A digital technique for pulse width modulation (PWM) utilizes a tapped delay line 304 receiving a reference clock and generating a plurality of time delayed reference clock transitions having...
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6975679 |
Configuration fuses for setting PWM options
Configuration bits are provided that configure PWM outputs of a processor incorporating a PWM module. The configuration bits cause the PWM module to put the PWM outputs into tri-state, active high...
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6970051 |
Pulse width modulator circuit having negative bias
A pulse width modulator is presented herein and it includes a pulse width driver circuit that receives a time varying ramp signal that is modulated by a time varying analog input signal to produce...
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6967541 |
Digital pulse-width-modulation generator
A digital pulse-width-modulation (PWM) generator comprising:
an n bit digital magnitude comparator having first and second n bit inputs and an output indicative of the relative values of the...
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6925115 |
Apparatus and method for safely handling asychronous shutdown of pulsewidth modulated output
An apparatus and method for safely handling asynchronous shutdown of pulsewidth modulated output. A shutdown circuit controls asynchronous shutdown of a pulsewidth modulated stage to ensure that...
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6919771 |
Digital amplifier
An object of the present invention is to provide a digital amplifier which is capable of preventing a reproduction of an analogue audio signal from a loud speaker, when an output sound volume from...
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6914935 |
Fractional N synthesizer with reduced fractionalization spurs
A fractional N synthesizer is disclosed. The synthesizer includes a phase detector that receives first and second input signals and generates a pulse width modulated (PWM) output signal having a...
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6775324 |
Digital signal modulation system
A variable aperture coding/decoding system suitable for use in a spread spectrum system provides multiple phase coding of an input NRZ bitstream. Each bit of a coded output signal is coded to...
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6768779 |
Pulse referenced control method for enhanced power amplification of a pulse modulated
To correct for any source of non-linearity and noise introduced in the power amplification of a pulse modulated signal, a correction unit is applied in-between the pulse modulator and the switching...
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6765449 |
Pulse width modulation circuit
A pulse width modulation circuit of the present invention includes: pulse generation means being provided with a first power supply and charged with a first current and a second current between...
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6741646 |
Modulation technique for transmitting a high data rate signal, and an auxiliary data signal, through a band limited channel
A digital data modulator is coupled to a source of a digital data signal having a data bit period, and a source of an auxiliary data signal. An encoder encodes the digital data using a variable...
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6667667 |
Method for driving at least one inductive load using pulse width modulated control signals
A method for driving at least one inductive load using pulse width modulated control signals, via a PWM control unit, the control pulses of the PWM control signals connecting the load to and...
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