Phase locked loop using pilot signal for lock detection

Details Phase locked loop using pilot signal for lock detection Phase locked loop using pilot signal for lock detection

1992-07-06

1994-02-15

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Plural a.f.s. for a single oscillator

331 25, 331DIG2, H03L 7095

Patent

active

052870731

ABSTRACT:
Arrangement including a phase-locked loop whose signal path incorporates a phase detector, a loop filter and a controlled oscillator, a pilot generator for generating a local auxiliary pilot which is applied to the controlled oscillator, and a pilot detector an input of which is coupled to the signal path of the loop and an output of which is coupled to a level detector via a filter member. In order to render an accurate and unambiguous locking indication possible in a simple manner, the frequency of the local auxiliary pilot is located within the passband of the loop and the pilot detector includes a synchronous detector having first and second inputs, the first input of which is coupled to the signal path of the loop between the phase detector and the controlled oscillator and the second input is coupled to the output of the pilot generator, an output of the synchronous detector being coupled to the low-pass filter.

REFERENCES:
patent: 4316154 (1982-02-01), Krause
patent: 4866402 (1989-09-01), Black

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