Delta-sigma pulse width modulator control circuit

Details Delta-sigma pulse width modulator control circuit Delta-sigma pulse width modulator control circuit

1997-10-16

1999-05-04

Tse, Young T.

Pulse or digital communications

Pulse width modulation

332109, H03K 708

Patent

active

059011769

ABSTRACT:
A delta sigma pulse width modulator control circuit uses a delta sigma modulator as a first stage to create a sequence of pulses representing an input control signal. A pulse width modulator weighs each pulse, accumulates the sequence of weighted pulses and defines a pulse width modulated output signal from the accumulated pulses. The pulse width modulated signal is given a randomly generated offset to the time of pulse value transition and an adjacent pulse value matching technique is used to reduce harmonically related noise generation.

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Magrath et al., "Power Digital-to-Analogue Conversion Using a Sigma-Delta Modulator with Controlled Limit Cycles", Electronic Letters, vol. 31, No. 4, Feb. 16, 1995, pp. 251-253.
Cooley et al., "PWM and PCM Techniques for Control of Digitally Programmable Switching Power Supplies", IEEE ISBN No. 0-7803-2570-2/95, pp. 1114-1117.

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