Patent ID: 8653873
Filing Date: 2014-02-18
Classification: H03K

Abstract:
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.