Circuit and method of generating a phase locked loop signal havi

Details Circuit and method of generating a phase locked loop signal havi Circuit and method of generating a phase locked loop signal havi

1998-12-08

2000-10-24

Nguyen, Lee

Telecommunications

Transmitter and receiver at same station

With frequency stabilization

455 23, 455 42, 455 47, 455 75, 4551651, 4551803, 455260, H04L 700, H03L 706, H04B 140

Patent

active

061379956

ABSTRACT:
An integrated transceiver circuit (10) includes a single side-band mixer (12) and a phase locked loop (30). The phase locked loop (30) includes a phase detector (32) coupled to a voltage controlled oscillator (36) via a summing circuit (33) and a low pass filter (34). A feedback signal from the voltage controlled oscillator (36) is transferred to the phase detector (32) through a counter (38). Either a phase modulation signal or a frequency modulation signal are inputs of summing circuit (33) and modulate the transmitter carrier signal generated by the voltage controlled oscillator (36). The carrier signal generated at an output terminal (40) of the transmitter tracks the frequency of the local oscillator signal that is supplied at an input terminal of the single side-band mixer (12) in the receiver.

REFERENCES:
patent: 3944925 (1976-03-01), De Laune
patent: 5019785 (1991-05-01), Fognini et al.
patent: 5159631 (1992-10-01), Quan et al.
patent: 5606731 (1997-02-01), Pace et al.
patent: 5727019 (1998-03-01), Tatsumi
patent: 5745843 (1998-04-01), Wetters et al.
patent: 5757921 (1998-05-01), Okanobu et al.
patent: 5794119 (1998-08-01), Evans et al.
patent: 5794131 (1998-08-01), Cairns

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