Variable frequency rate receiver

Details Variable frequency rate receiver Variable frequency rate receiver

1987-12-28

1989-09-26

Griffin, Robert L.

Pulse or digital communications

Repeaters

Testing

375120, 331 14, H03D 300

Patent

active

048706604

ABSTRACT:
A variable data rate receiver is provided which employs a novel phase locked loop (PLL) of the type employing a data detection loop and a tracking loop. The data detection loop is initially not coupled to the input of the voltage controlled oscillator in the tracking loop of the PLL, but is separated by an electronic switch. A phase lock detection circuit is provided which is coupled to the data detection loop and to the tracking loop for detecting the difference in the voltage error signals in the data detection loop and the tracking loop. When this error signal indicates that the tracking loop is locked on to the carrier signal the electronic switch is closed completing the phase locked loop circuit after lock on of the carrier is achieved.

REFERENCES:
patent: 4600889 (1986-07-01), Rugen
patent: 4614910 (1986-09-01), Ishigaki et al.
patent: 4713630 (1987-12-01), Matthews

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