Tuning apparatus of phase-locked loop type

Details Tuning apparatus of phase-locked loop type Tuning apparatus of phase-locked loop type

1982-12-17

1985-06-04

LaRoche, Eugene R.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 16, 331 25, 455260, H03L 708

Patent

active

045217440

ABSTRACT:
A tuning apparatus of phase-locked loop type having a voltage controlled oscillator which is working as a local oscillator of a tuning circuit, a programmable divider supplied with the output signal from the voltage controlled oscillator, a reference frequency signal generating circuit, a phase comparator supplied with the output signal from the voltage controlled oscillator and the output signal from the reference frequency signal generating circuit, and supplying the output signal to the voltage controlled oscillator, the programmable divider, the reference frequency signal generating circuit and the phase comparator being formed in a single integrated circuit, and a control circuit formed separately from the integrated circuit for supplying a control data to the programmable divider in the single integrated circuit is disclosed, in which the integrated circuit further comprises a memory for memorizing the control data which is serially supplied from the control circuit and supplying the control data to the programmable divider in parallel.

REFERENCES:
patent: 4321555 (1982-03-01), Howk et al.
patent: 4392253 (1983-07-01), Yamada et al.

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