Crystal stabilized voltage to frequency converter with digital c

Details Crystal stabilized voltage to frequency converter with digital c Crystal stabilized voltage to frequency converter with digital c

1979-10-09

1982-01-12

Ruehl, Charles A.

Measuring and testing

Volume or rate of flow

By measuring electrical or magnetic properties

7386116, 7386177, G01F 160

Patent

active

043099092

ABSTRACT:
A voltage controlled oscillator (VCO) system includes a feedback loop for maintaining the linearity, temperature stability and accuracy of the VCO. The feedback loop includes means for producing a fed-back train of pulses having an amplitude equal to a reference voltage and a duty cycle proportional to the ratio of the frequency of the output of the VCO to a reference frequency. The output frequency is thereby made proportional to the input voltage times the ratio of the reference frequency to the reference voltage.

REFERENCES:
patent: 3260109 (1966-07-01), Schmoock
patent: 4089219 (1978-05-01), Suzuki
patent: 4167871 (1979-09-01), Shauger et al.

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