Generation and synchronization of pulse-width modulated (PWM) waveforms for radio-frequency (RF) applications
First Claim
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1. A pulse width modulation (PWM) generator, comprising,a phase-shifting circuit having at least one input and two or more outputs, said phase-shifting circuit configured to receive a sinusoidal reference signal and in response thereto provide a phase-shifted signal on each of said two or more outputs, each phase-shifted signal having a predetermined phase shift relative to the reference signal;
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Abstract
Described are concepts, systems, circuits and techniques directed toward methods and apparatus for generating one or more pulse width modulated (PWM) waveforms with the ability to dynamically control pulse width and phase with respect to a reference signal.
65 Citations
24 Claims
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1. A pulse width modulation (PWM) generator, comprising,
a phase-shifting circuit having at least one input and two or more outputs, said phase-shifting circuit configured to receive a sinusoidal reference signal and in response thereto provide a phase-shifted signal on each of said two or more outputs, each phase-shifted signal having a predetermined phase shift relative to the reference signal; - and
a waveform combiner having a plurality of inputs with each input coupled to a respective one of the two or more outputs of said phase-shifting circuit, said waveform combiner configured to receive phase-shifted signals from said phase-shifting circuit at inputs thereof and in response thereto, generate a PWM signal having a predetermined pulse width and phase-shift relative to the reference signal, wherein the predetermined phase shift is between a rising edge of the PWM signal and a negative-to-positive transition of the reference signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An apparatus for generating dynamically controlled pulse width modulation (PWM) signals, comprising:
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two or more phase-shifting elements each having an input and output with the input of each phase-shifting element configured to receive a reference signal wherein each phase-shifting element is configured to generate a respective phase-shifted signal at its output based upon the reference signal and a phase-shift parameter provided thereto; and a waveform combiner having inputs coupled to the outputs of the phase-shifting elements and configured to combine phase-shifted signals provided thereto from the outputs of the phase-shifting elements to generate a PWM signal having a pulse width and phase shift based upon a characteristic of the reference signal and the phase-shift parameter, wherein the predetermined phase shift is between a rising edge of the PWM signal and a negative-to-positive transition of the reference signal. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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20. A method for generating dynamically controlled pulse width modulation (PWM) waveforms, comprising:
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receiving a reference signal at one or more phase-shifting elements, each phase-shifting element having a respective predetermined phase shift parameter; generating respective phase-shifted signals at outputs of the one or more phase-shifting elements based upon the reference signal and the respective predetermined phase shift parameters; combining the generated phase-shifted signals to obtain a PWM waveform having a pulse width and phase shift based upon the predetermined phase shift parameters of the phase-shifting elements, wherein the predetermined phase shift parameters determine a phase shift between a rising edge of the PWM waveform and a negative-to-positive transition of the reference signal. - View Dependent Claims (21, 22, 23, 24)
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Specification