Clock-controlled pulse width modulator

Details Clock-controlled pulse width modulator Clock-controlled pulse width modulator

1987-11-04

1989-05-02

Shoop, Jr., William M.

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

341167, H03M 160

Patent

active

048272612

ABSTRACT:
A clock-controlled pulse width modulator comprising an integrator for receiving a variable input voltage and producing an output having a triangular waveform, the integrator including a capacitor which is charged at a rate proportioal to the input voltage and discharged at a rate proportional to the difference between a reference voltage and the input voltage, the charging and discharging occurring during a time interval T.sub.o, a clock pulse source for generating a continuous series of clock pulses, a counter receiving the clock pulses and producing a binary control signal which changes state in response to the counting of a preselected number of clock pulses, the control signal having a period T.sub.o, and control means for terminating the charging of the capacitor and initiating the discharging of the capacitor in response to the first clock pulse following a selected transition in the control signal, and means for terminating the discharging of the capacitor and initiating the charging of the capacitor in response to the first clock pulse following the discharge of the capacitor to a preselected threshold level.

REFERENCES:
patent: 3660834 (1972-05-01), Picot et al.
patent: 3970943 (1976-07-01), Chapman et al.
patent: 4118696 (1978-10-01), Warther
patent: 4410812 (1983-10-01), Honig et al.
patent: 4446439 (1984-05-01), Mizumoto et al.
patent: 4558301 (1985-12-01), Trofimenkoff et al.
patent: 4584566 (1986-04-01), Arcara
patent: 4623800 (1986-11-01), Price et al.

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