Spread spectrum phase locked loop with phase correction

Details Spread spectrum phase locked loop with phase correction Spread spectrum phase locked loop with phase correction

1989-08-23

1991-03-26

Cangialosi, Salvatore

Pulse or digital communications

Repeaters

Testing

H04K 102

Patent

active

050035533

ABSTRACT:
A global positioning system (GPS) receiver includes a phase locked loop that locks to the carrier signal from the GPS satellite at an offset frequency in order to recover the GPS data. The loop includes a phase shifter driven by a system clock through a synchronous clock inversion circuit. The phase of the system clock is periodically inverted synchronously with respect to the clock in order to compensate for the offset loop frequency so that the loop does not lose lock because of the offset error.

REFERENCES:
patent: 4543657 (1985-09-01), Wikinson
patent: 4617674 (1986-10-01), Mangolis
patent: 4852121 (1989-07-01), Kingston et al.

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