METHOD AND SYSTEMS FOR HIGH-PRECISION PULSE-WIDTH MODULATION
First Claim
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1. A method for generating high-precision pulse-width modulation, the method comprising:
- calibrating a delay line comprising a plurality of delay units to a system clock, each delay unit having a delay that may vary with time;
determining a desired number of partitions of the system clock;
mathematically 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, to the subset of partitions, a calibration code corresponding to the calibrated delay line, wherein the shift amount is less than a period of the system clock; and
applying the shift amount to rising and falling edges of a low-precision pulse-width modulation waveform to thereby generate a high-precision pulse-width modulation waveform having a precision finer than that of the system clock.
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Abstract
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.
17 Citations
27 Claims
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1. A method for generating high-precision pulse-width modulation, the method comprising:
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calibrating a delay line comprising a plurality of delay units to a system clock, each delay unit having a delay that may vary with time; determining a desired number of partitions of the system clock; mathematically 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, to the subset of partitions, a calibration code corresponding to the calibrated delay line, wherein the shift amount is less than a period of the system clock; and applying the shift amount to rising and falling edges of a low-precision pulse-width modulation waveform to thereby generate a high-precision pulse-width modulation waveform having a precision finer than that of the system clock. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A system for generating high-precision pulse-width modulation, the system comprising:
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a delay-locked loop comprising a plurality of delay units having time-variable delays, the delay-locked loop being locked to a system clock; control logic for selecting a subset S of the plurality of delay units to thereby generate a time-invariant shift amount having a precision finer than that of the 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. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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Specification