Abstract: An amplifier may use pulse-width modulators controlling respective sets of switches to produce an amplified version of a source signal. A phase locked loop in the amplifier may generate a differential clock signal. A first processing element operating according to a first supply voltage may generate a PWM signal representative of the source signal, and also generate a clock enable signal corresponding to the differential clock signal. A second processing element (PE2) may receive the differential clock signal, the PWM signal, and the clock enable signal, and level shift the PWM signal and the clock enable signal to operate according to a second supply voltage, and may generate a resampling clock signal from the differential clock signal according to the level shifted clock enable signal. The PE2 may provide a PWM output signal representative of the source signal by resampling the level shifted PWM signal with the resampling clock signal.

Abstract: An amplifier may use pulse-width modulators controlling respective sets of switches to produce an amplified version of a source signal. A phase locked loop in the amplifier may generate a differential clock signal. A first processing element operating according to a first supply voltage may generate a PWM signal representative of the source signal, and also generate a clock enable signal corresponding to the differential clock signal. A second processing element (PE2) may receive the differential clock signal, the PWM signal, and the clock enable signal, and level shift the PWM signal and the clock enable signal to operate according to a second supply voltage, and may generate a resampling clock signal from the differential clock signal according to the level shifted clock enable signal. The PE2 may provide a PWM output signal representative of the source signal by resampling the level shifted PWM signal with the resampling clock signal.

Abstract: An improved method for generating pulse width modulated signals, e.g., for use in audio amplifiers, power amplifiers, etc. An input digital value is received and divided by a number N, producing a quotient and a residue. A plurality N of edge modulation values may then be generated based on the quotient and the residue. Each of the N edge modulation values specifies an edge of the pulse width modulated signal to be generated. Generation of the N edge modulation values may comprise applying the residue to one or more of the N edge modulation values when the residue is greater than zero. The residue may be applied to different ones of the plurality N of edge modulation values during different iterations of the method in a non-stationary fashion. The pulse width modulated signal may then be generated based on the N edge modulation values.