Generation of adjustable phase reference waveform
First Claim
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1. A system comprising:
- a first pulse-width modulation (PWM) channel configured to provide a first PWM waveform having a first duty cycle and a first frequency;
a second PWM channel configured to provide a second PWM waveform having a second duty cycle and the first frequency;
combinational logic configured to combine the first PWM waveform and the second PWM waveform to generate a phase-shifted reference PWM waveform having the first frequency and a phase shift that is based on the first duty cycle and the second duty cycle and being relative to a carrier PWM waveform having a fixed duty cycle and the first frequency; and
a phase sensitive demodulator to demodulate an output signal based on the phase-shifted reference PWM waveform and to provide a corresponding demodulated output signal, the output signal being modulated by the carrier PWM waveform and having the frequency of the carrier PWM waveform.
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Abstract
One embodiment provides a system for generating a reference waveform. The system can include a first pulse-width modulation (PWM) channel configured to provide a first PWM waveform having a first duty cycle and a first frequency. A second PWM channel is configured to provide a second PWM waveform having a second duty cycle and the first frequency. Combinational logic is configured to combine the first PWM waveform and the second PWM waveform to generate a phase-shifted reference PWM waveform having the first frequency and a phase shift that is based on the first duty cycle and the second duty cycle.
13 Citations
20 Claims
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1. A system comprising:
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a first pulse-width modulation (PWM) channel configured to provide a first PWM waveform having a first duty cycle and a first frequency; a second PWM channel configured to provide a second PWM waveform having a second duty cycle and the first frequency; combinational logic configured to combine the first PWM waveform and the second PWM waveform to generate a phase-shifted reference PWM waveform having the first frequency and a phase shift that is based on the first duty cycle and the second duty cycle and being relative to a carrier PWM waveform having a fixed duty cycle and the first frequency; and a phase sensitive demodulator to demodulate an output signal based on the phase-shifted reference PWM waveform and to provide a corresponding demodulated output signal, the output signal being modulated by the carrier PWM waveform and having the frequency of the carrier PWM waveform. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method for generating a reference waveform comprising:
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generating a first pulse-width modulation (PWM) waveform having a first frequency; generating a second PWM waveform having the first frequency; generating a carrier waveform having a fixed duty cycle and the first frequency; exclusive-ORing the first PWM waveform and the second PWM waveform to provide the reference waveform, the reference waveform having a phase shift relative to the carrier waveform that is adjustable based on a duty cycle of the first PWM waveform and the second PWM waveform; demodulating an output signal that is modulated by the carrier waveform; and providing a corresponding demodulated output signal. - View Dependent Claims (18, 19, 20)
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Specification