Reconfigurable counter and pulse width modulator (PWM) using sam

Details Reconfigurable counter and pulse width modulator (PWM) using sam Reconfigurable counter and pulse width modulator (PWM) using sam

1994-02-25

1996-01-16

Chin, Stephen

Pulse or digital communications

Pulse width modulation

370 9, 332109, H03K 708

Patent

active

054854873

ABSTRACT:
A pulse width modulator (20) includes a reconfigurable counter (30) whose width is determined by mode control bits. In one embodiment, a decoder (24) decodes the mode control bits to provide decoded width control signals to the reconfigurable counter (30). The width control signals enable selected least significant counter cells (101-107) of the reconfigurable counter (30) in a binary-to-thermometer fashion. Thus, unused counter cells are disabled, reducing power. The pulse width modulator (20) also includes an output circuit (25) which provides a pulse width modulated output signal having a duty cycle determined by a proportion of a cycle of the reconfigurable counter (30) during which a comparator (23) detects that an output of the reconfigurable counter (30) has reached a value of an input number. A portion of the comparator (23) may also be disabled in response to the width control signals.

REFERENCES:
patent: 3510780 (1970-05-01), Buehrle
patent: 4502024 (1985-02-01), Nishikawa et al.
patent: 4550307 (1985-10-01), Akashi et al.
patent: 5021788 (1991-06-01), Ueki et al.
patent: 5070312 (1991-12-01), Cho
patent: 5231363 (1993-07-01), Sano et al.
patent: 5241541 (1993-08-01), Farrell et al.
patent: 5298871 (1994-03-01), Shimohara

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