Modulators – Pulse or interrupted continuous wave modulator – Pulse width modulator
Patent
1996-02-13
1997-02-25
Mis, David
Modulators
Pulse or interrupted continuous wave modulator
Pulse width modulator
327172, 331143, 348730, H03B 524, H03K 708, H03K 3013
Patent
active
056062966
ABSTRACT:
A pulse width modulation control circuit of the present invention causes variation amplitudes of a sawtooth voltage in a sawtooth oscillator being synchronized by an external signal to be lowered thereby improving characteristics with respect to both a noise and a system control. The pulse width modulation control circuit includes a sawtooth oscillating means for generating a sawtooth voltage after receiving the synchronizing signal, that is, a synchronizing frequency; a sawtooth controller for receiving the sawtooth voltage generated from the sawtooth oscillating means, also receiving a reference voltage with respect to the sawtooth voltage, and outputting a current controlling constantly an amplitude of the sawtooth voltage to the sawtooth oscillating means; and a pulse width modulating means for receiving an output voltage, also receiving a reference voltage with respect to the output voltage, then receiving the sawtooth voltage generated from the sawtooth oscillating means 100, modulating a pulse width.
REFERENCES:
patent: 4742316 (1988-05-01), Riedger
patent: 4941078 (1990-07-01), Leonardi
patent: 5418501 (1995-05-01), Schoofs et al.
patent: 5457435 (1995-10-01), Hoffman
patent: 5546054 (1996-08-01), Maccarrone et al.
Mis David
Samsung Electronics Co,. Ltd.
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