Clock-controlled voltage-to-frequency converter

Details Clock-controlled voltage-to-frequency converter Clock-controlled voltage-to-frequency converter

1987-11-04

1989-07-11

Shoop, Jr., William M.

Coded data generation or conversion

Analog to or from digital conversion

Bipolar

307261, 328151, H03M 152

Patent

active

048476200

ABSTRACT:
A clock-controlled voltage-to-frequency converter comprising a reference voltage source, an integrator for receiving the reference voltage and a variable input voltage and producing an output having a triangular waveform, the integrator including a capacitor which is charged at a rate proportional to the input voltage and discharged at a rate proportional to the difference between the 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 responsive to the clock pulses for terminating the discharging of the capacitor and initiating the charging of the capacitor at a fixed time interval following termination of the charging of the capacitor, a logic circuit responsive to the output of the integrator for terminating the charging of the capacitor and initiating the discharging of the capacitor when the integrator output rises above a preselected threshold level, the time required for the capacitor to charge to the threshold level varying in accordance with the magnitude of the input voltage.

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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