BPSK Costas-type PLL circuit having false lock prevention

Details BPSK Costas-type PLL circuit having false lock prevention BPSK Costas-type PLL circuit having false lock prevention

1986-07-29

1987-12-15

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Search sweep of oscillator

331DIG2, 329 50, 329124, 375 81, 375120, H03L 712, H04L 2722

Patent

active

047136308

ABSTRACT:
A BPSK Costas-type PLL circuit in which the circuit is positively prevented from falsely locking on to the input signal and in which the need for a complex lock detector is eliminated. The output levels of both the 0.degree. and 90.degree. sub-loops of the circuit are detected and a difference formed between the detected outputs. When the difference exceeds a predetermined reference level, it is determined that true locking has occurred, whereupon a sweep generator, used in achieving initial lock, is decoupled from the PLL circuit.

REFERENCES:
patent: 4213096 (1980-07-01), Daniel, Jr.
patent: 4241454 (1980-12-01), Snell et al.
patent: 4297650 (1981-10-01), Shinmyo
patent: 4314206 (1982-02-01), Attwood et al.
patent: 4507617 (1985-03-01), Sasaki
patent: 4547736 (1985-10-01), Takeda

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