Pulse-width modulator

Details Pulse-width modulator Pulse-width modulator

1987-04-13

1988-05-03

LaRoche, Eugene R.

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

332 14, H03K 908

Patent

active

047423161

ABSTRACT:
A pulse-width modulator comprising a square-wave generator which triggers a monostable multivibrator driven by a controllable constant current source, the multivibrator having a capacitor as a timing element. The output of the multivibrator controls a gate circuit to which the square wave is also applied, thereby controlling the width of the square wave output from the gate circuit. The modulator can be assembled from standard CMOS building blocks and several external components, thereby achieving a power dissipation below 10 mW. If the current source is controlled by a CMOS variable-gain amplifier, the modulator can serve as the control circuit of a clocked direct voltage converter having internal losses below 25 mW.

REFERENCES:
patent: 3452297 (1969-06-01), Kelly et al.
patent: 3568094 (1971-03-01), Metzger

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