Method and systems for high-precision pulse-width modulation

摘要

In various embodiments, systems and methods for generating high-precision pulse-width modulation include a delay-locked loop comprising multiple delay units having time-variable delays, control logic for selecting a subset S of the multiple delay units to thereby generate a time-invariant shift amount having a precision finer than that of a system clock and circuitry for applying the shift amount to rising and falling edges of a pulse-width modulation waveform to thereby generate a high-precision pulse-width modulation waveform.

主权项

1. A method for generating high-precision pulse-width modulation, the method comprising:
calibrating a delay line of a delay-locked loop to a system clock according to a calibration code, wherein the delay-locked loop includes a plurality of delay units, each delay unit having a delay that may vary with time; determining a desired number of partitions of the system clock; selecting a subset of the partitions, wherein the subset of the partitions corresponds to a desired amount to shift rising and falling edges of a low-precision pulse-width modulation waveform; generating the desired shift amount by applying a delay code to a delay line associated with a pulse width modulator channel, wherein the delay code is a multiplication product associated with the subset of the partitions and the calibration code corresponding to the calibrated delay line of the delay-locked loop, and further wherein the desired shift amount is less than a period of the system clock; and applying the desired shift amount to rising and falling edges of a low-precision pulse-width modulation waveform to generate a high-precision pulse-width modulation waveform having a precision finer than that of the system clock.