Rapid acquisition, tracking PLL with fast and slow sweep speeds

Details Rapid acquisition, tracking PLL with fast and slow sweep speeds Rapid acquisition, tracking PLL with fast and slow sweep speeds

1984-12-20

1986-09-23

Mullins, James B.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Search sweep of oscillator

331 17, 331DIG2, H03L 706

Patent

active

046138250

ABSTRACT:
A tracking phase locked loop circuit in which the frequency of an oscillator portion thereof is varied over a range of frequencies in search of an incoming carrier is disclosed. The varying frequency occurs at two different sweep rates. A faster rate is used until the frequency of the phase locked loop's oscillator nears the frequency of the incoming carrier, and a slower rate is used until the circuit locks onto the carrier. A filter couples between mixer and sweep control circuit portions of the phase locked loop to provide information concerning the difference between oscillator frequency and incoming carrier frequency. The sweep control circuit distinguishes between the carrier and noise and switches rates accordingly.

REFERENCES:
patent: 3777276 (1973-12-01), Klein
patent: 3909735 (1975-09-01), Anderson et al.
patent: 4115745 (1978-09-01), Egan
patent: 4316154 (1982-02-01), Krause
patent: 4419760 (1983-12-01), Bjornholt
patent: 4423390 (1983-12-01), Waters

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