Oscillator having manual and automatic frequency control

Details Oscillator having manual and automatic frequency control Oscillator having manual and automatic frequency control

1982-06-15

1985-05-28

LaRoche, Eugene R.

Oscillators

With frequency adjusting means

With voltage sensitive capacitor

331 1R, 331 25, 331 34, H03L 700

Patent

active

045203270

ABSTRACT:
A variable frequency oscillator 10 has an output frequency Fo responsive to a voltage input Vo derived from an analogue integrator 11 controlled by potentiometer 15, 16, the frequency Fo being displayed on frequency meter 19 having a ghost least significant digit. A converter 24 responds to the digit of a digital output fed to a digital to analogue converter 20 providing an error voltage Ve whose magnitude is proportional to the deviation of the digit from a datum, e.g. 5, and whose polarity depends on whether the deviation is + or -. The voltage Ve is also fed to the integrator 11 to control the voltage Vo.
An arrangement is also described in which the voltage Ve is derived from the divider chain of a gate period generator controlling a frequency counter whose input is Fo.

REFERENCES:
patent: 3484712 (1969-12-01), Foote et al.
patent: 3753141 (1973-08-01), Van Elk et al.
patent: 3806825 (1974-04-01), Schlosser
patent: 4031483 (1977-06-01), Formeister

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