Schemes to implement multi-level PWM in digital system

Details Schemes to implement multi-level PWM in digital system Schemes to implement multi-level PWM in digital system

2007-05-08

2007-05-08

Barnie, Rexford (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

C341S155000

Reexamination Certificate

active

11103952

ABSTRACT:
A digital system employing a multi-channel and multi-level PWM technique that allows for smoother transitions in the outputs of the multiple channels in response to variations in the level of a digital input signal. The system generates PWM and other digital control signals to control switching circuitry included in the multiple channels, in which the PWM control signals are generated from a number of LSBs of the digital input signal, and the other digital control signals are generated from the remaining MSBs of the digital input signal. The system provides selected ones of the PWM and other digital control signals to each channel for controlling the switching circuitry included therein. By providing both the PWM and the other digital control signals to the multiple channels in an interleaved manner, smoother transitions in the outputs of the various channels can be achieved, thereby reducing the occurrence of unwanted transients in the system output.

REFERENCES:
patent: 5774084 (1998-06-01), Brombaugh et al.
patent: 6693571 (2004-02-01), Melanson et al.
patent: 2002/0041246 (2002-04-01), Chang et al.
patent: 1 388 943 (2004-11-01), None
U.S. Appl. No. 10/819,573, filed Apr. 7, 2004, entitled Multi-Level Pulse Width Modulation (PWM) in Digital System, inventor Ying Lau Lee.

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