Fine tuned pulse width modulation

Details Fine tuned pulse width modulation Fine tuned pulse width modulation

2011-04-26

2011-04-26

Cox, Cassandra (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Rectangular or pulse waveform width control

C327S172000

Reexamination Certificate

active

07932761

ABSTRACT:
Techniques and an apparatus for producing pulse width modulation (PWM) edges are described. A PWM controller circuit with a polyphase counter is described. The polyphase counter may comprise a plurality of counters. Each of the counters may be set to a specific initial count value. A polyphase decoder block with a plurality of sets of high/low decoders are coupled to outputs from the polyphase counter. A set/reset block with a plurality of set/reset logic elements is coupled to outputs from the polyphase decoder block. A serializer is coupled to outputs from the plurality of set/reset blocks to generate PWM edges. Multiple parallel phases of a PWM pulse may be created with the circuit. Using a polyphase counter and comparator to create multiple parallel phases may speed up the controller circuit and provide a finer tuning resolution.

REFERENCES:
patent: 5587709 (1996-12-01), Jeong
patent: 5623497 (1997-04-01), Shimawaki et al.
patent: 2006/0279440 (2006-12-01), Zhao et al.
patent: 2007/0097069 (2007-05-01), Kurokawa et al.

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