Oscillator circuit employing frequency-locked loop feedback topo

Details Oscillator circuit employing frequency-locked loop feedback topo Oscillator circuit employing frequency-locked loop feedback topo

1997-07-31

1999-11-30

Kinkead, Arnold

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 49, 331176, 331 74, 331177R, H03L 700

Patent

active

059949678

ABSTRACT:
An integrated, crystalless oscillator includes a voltage controlled oscillator circuit for generating an output signal, and a frequency-locked feedback network to stabilize the frequency of the output signal. The frequency-locked feedback network includes a divide-down circuit and a frequency-controlled variable resistor, the divide-down circuit divides down the frequency of the output signal to produce a feedback frequency which is used to control the frequency-controlled variable resistor. The control voltage for the voltage controlled oscillator circuit is derived from the voltages across a fixed resistor and the frequency-controlled variable resistor. The voltages across these resistors drive an amplifier, with the output of the amplifier being the control voltage for the voltage controlled oscillator circuit.

REFERENCES:
patent: 3852681 (1974-12-01), Underhill
patent: 5594388 (1997-01-01), O'Shaughnessy et al.
patent: 5673005 (1997-09-01), Pricer

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