Pulse width modulation circuit and integration circuit of analog

Details Pulse width modulation circuit and integration circuit of analog Pulse width modulation circuit and integration circuit of analog

1983-07-26

1986-03-18

Zazworsky, John

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307498, 307265, 328160, 328 58, H03K 505, H03K 708

Patent

active

045771545

ABSTRACT:
A pulse width modulation circuit which can cancel the mean error of pulse width modulation with respect to time due to the offset voltage of a triangular wave signal and to the offset voltage of a comparator, by adding simple circuits to an existing pulse width modulation circuit. The invention relates also to an integration circuit of the product of two analog signals using the pulse width modulation circuit described above.
The principle of the present invention combines a circuit for cancelling the offset of a triangular wave signal by inverting either the triangular wave signal with respect to an input signal or the input signal with respect to the triangular wave signal, in every predetermined period, with a circuit for eliminating the offset of a comparator by inverting the output of the comparator and replacing the input terminals of the comparator if the input signal is not inverted, or connecting the input terminal of the comparator as such if the input signal is inverted.

REFERENCES:
patent: 4066959 (1978-01-01), Milkovic
patent: 4495463 (1985-01-01), Milkovic

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