Apparatus and method for inhibiting false locking of a phase-loc

Details Apparatus and method for inhibiting false locking of a phase-loc Apparatus and method for inhibiting false locking of a phase-loc

1977-02-22

1978-02-28

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Search sweep of oscillator

329122, 331 19, 331 23, 331 25, H03B 304, H03D 300

Patent

active

040770168

ABSTRACT:
Apparatus and method are provided to discriminate between true locking of a phase-locked loop on the main lobe of an information signal, and false locking on a side lobe thereof. The energy in the locked signal is sensed and compared with the signal energy at fixed frequency increments, preferably twice the bit clock rate frequency, above and below the lock frequency. A greater energy content at the increment frequencies than at the locked frequency indicates a false lock condition and is used to inhibit the loop from entering a locked mode.

REFERENCES:
patent: 3768030 (1973-10-01), Brown et al.
patent: 3810036 (1974-05-01), Bloedorn
patent: 4000476 (1976-12-01), Walker et al.

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