Phase detector circuit for a phase control loop

Details Phase detector circuit for a phase control loop Phase detector circuit for a phase control loop

2005-09-27

2005-09-27

Chin, Stephen (Department: 2634)

Pulse or digital communications

Receivers

Particular pulse demodulator or detector

C375S375000, C375S376000, C375S373000

Reexamination Certificate

active

06950482

ABSTRACT:
A phase detector circuit for a phase control loop includes two EXOR circuits and an integrating loop filter which are connected to form one circuit. The two EXOR circuits have common load resistors or current sources. The output signals from the EXOR circuits are integrated through the use of two integrators, which are respectively connected in parallel with the common load resistors or current sources. The voltage across the two integrators provides the output voltage of the loop filter. This eliminates the need for an additional differential amplifier and integrator. The phase detector has a low current consumption and can be produced with a simplified circuit technique.

REFERENCES:
patent: 4086539 (1978-04-01), Gustafson et al.
patent: 4535459 (1985-08-01), Hogge, Jr.
patent: 5034748 (1991-07-01), Goedeke et al.
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patent: 2001/0006343 (2001-07-01), Yoshizawa
patent: 2001/0031028 (2001-10-01), Vaucher
patent: 2002/0061086 (2002-05-01), Adachi et al.
patent: 32 00 491 (1982-11-01), None
patent: 0 716 501 (1996-06-01), None
Charles R. Hogge, Jr.: “A Self Correcting Clock Recovery Circuit”, Journal of Lightwave Technology, vol. LT-3, No. 6, Dec. 1985, pp. 1312-1314.

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