PLL out-of-capture range detection and lock acquisition circuit

Details PLL out-of-capture range detection and lock acquisition circuit PLL out-of-capture range detection and lock acquisition circuit

1982-09-24

1985-06-11

Laroche, Eugene R.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Search sweep of oscillator

331 11, 331 14, 331 17, 331DIG2, 455260, H03L 708

Patent

active

045231575

ABSTRACT:
An improved PLL frequency synthesizer for producing a signal of frequency f.sub.T -f.sub.IF or f.sub.T +f.sub.IF is provided with a detection-control circuit which detects from the voltage applied to a voltage controlled oscillator (VCO) in the PLL that the VCO frequency reaches an upper or lower limit frequency and upon the detection forces the VCO to fall into the capture range. The improved PLL frequency synthesizer can acquire lock even if it has been thrown out of the capture range.

REFERENCES:
patent: 4007429 (1977-02-01), Cadalora et al.
patent: 4316154 (1982-02-01), Krause
patent: 4388598 (1983-06-01), Egan
patent: 4433308 (1984-02-01), Hirata

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