Multiple reference frequency generator

Details Multiple reference frequency generator Multiple reference frequency generator

1988-04-21

1989-08-08

LaRoche, Eugene R.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Transistorized controls

331 25, H03L 720

Patent

active

048556882

ABSTRACT:
In a multiple reference frequency generator, instead of using a quartz crystal for each of the accurate frequencies to be produced, a single quartz crystal is used together with a current controlled oscillator (ICO) and a phase loop comprising a phase comparator (PHC) and a control current generator (GC). The current generator provides a current varying as a function of a voltage and inversely proportional to a resistor value. In a first step, the phase loop causes the oscillator to oscillate at a frequency F0 and the resistor has a value R0. In a second phase, the loop is opened and the resistor is given a value R1 causing the oscillator to oscillate at a frequency F1=F0.times.R0/R1.

REFERENCES:
patent: 3956961 (1976-05-01), Peterson
patent: 4105946 (1978-08-01), Ikeda
Japanese Abstracts of Japan, vol. 6, No. 155 (E-125) (1033), Aug. 17, 1982.

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