Pulse width modulator including incrementer/decrementer

Details Pulse width modulator including incrementer/decrementer Pulse width modulator including incrementer/decrementer

1993-09-30

1994-10-18

Grimm, Siegfried H.

Modulators

Pulse or interrupted continuous wave modulator

Pulse width modulator

375 22, 318599, 318811, 388811, H03K 708

Patent

active

053572190

ABSTRACT:
A pulse width modulator comprises: a reload register (8) which stores data D1 set as an initial value of data D and loads to a waveform timer (3), every time one waveform cycle is counted; a comparing circuit (10) which compares the data D1 and data D2 when the data D1 is changed to the data D2; and an incrementer/decrementer (9) which functions as an increment when the data D2 is larger than the data D1 as the comparing result, and as an decrementer when smaller, and every time the one waveform cycle is counted by a cyclic timer (7), increments or decrements the data D1 held in the waveform timer (3); and changes the ratio of an "H" level period and an "L" level period of an output waveform relatively slowly, against the rate of change (from D1 to D2) of a set value D of a timer register (2) for setting the "H" level period and the "L" level period of a pulse width modulation waveform.

REFERENCES:
patent: 4502024 (1985-02-01), Nishikawa et al.

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