Variable frequency oscillator

Details Variable frequency oscillator Variable frequency oscillator

1987-04-22

1989-02-07

Laroche, Eugene R.

Oscillators

With frequency adjusting means

With voltage sensitive capacitor

331113R, H03K 3281

Patent

active

048034452

ABSTRACT:
A variable frequency oscillator (VFO) providing a plurality of timing signals set by an external resistor is described. The single external resistor is utilized to set the center frequency of the VFO. The VFO is comprised of a voltage controlled oscillator (VCO), analog divider, and a plurality of current mirrors. The timing currents of the VCO are set by the external resistor and are independent of the control voltage Vc of the VCO. The VFO gain is independent of control voltage for improved control of the open loop gain. The timing voltage swing is inversely proportional to the control voltage but is independent of the timing currents. Current mirrors are coupled to the external resistor and the timing current to provide a plurality of timing signals.

REFERENCES:
patent: 4633488 (1986-12-01), Shaw
patent: 4692717 (1987-09-01), Ouyang et al.

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