Local oscillator for multi-band reception having single crystal

Details Local oscillator for multi-band reception having single crystal Local oscillator for multi-band reception having single crystal

1979-01-29

1981-03-31

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Plural oscillators controlled

331 22, 331 25, 455260, H03L 716, H04B 126

Patent

active

042596440

ABSTRACT:
A local oscillator having a variable frequency oscillator and a carrier frequency oscillator for use in communication systems that transmit and/or receive signals on multiple frequency bands, one crystal reference oscillator; a converter circuit for mixing the outputs of at least the variable frequency oscillator and the carrier frequency oscillator to produce an output having a frequency corresponding to the receiving frequency and a phase-locked loop circuit including a plurality of voltage control oscillators corresponding to the number of receiving frequency bands; a mixing circuit for mixing the output of a predetermined one of the voltage control oscillators corresponding to a predetermined one of the frequency bands with the output of the converter circuit to produce an output of fixed frequency corresponding to the one frequency band; a programmable counter that divides the output of the mixing circuit in accordance with a frequency dividing ratio corresponding to the one frequency band; and a phase comparator for comparing the phase of the output signal from the programmable counter with that of the output from the one crystal reference oscillator to provide a control signal for the one voltage control oscillator whereby the one crystal reference oscillator may be employed with all of the voltage control oscillators.

REFERENCES:
patent: 4095190 (1978-06-01), Imazeki et al.
patent: 4137508 (1979-01-01), Hugenholtz
patent: 4152669 (1979-05-01), Igarashi
patent: 4198604 (1980-04-01), Holdaway

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