Out of lock detector for phase lock loop synthesizer

Details Out of lock detector for phase lock loop synthesizer Out of lock detector for phase lock loop synthesizer

1974-11-08

1976-01-13

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

With reference oscillator or source

331 74, H03B 304

Patent

active

039328210

ABSTRACT:
In a radio synthesizer adapted for use in an aircraft transceiver, an out of lock detector which enables or inhibits output from the synthesizer depending upon whether the synthesizer phase lock loop is in or out of lock. Under normal in lock operating conditions the oscillator output is coupled to the input of an output amplifier. When the loop is out of lock, pulse signals are generated at the loop phase detector and peak integrated to produce a signal which inhibits transmission of the oscillator output to the output amplifier, so that no output is produced while the synthesizer searches for a selected frequency.

REFERENCES:
patent: 3354403 (1967-11-01), Thomas
patent: 3611175 (1971-10-01), Boelke

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