Phase shifting circuit having a constant phase shift

Details Phase shifting circuit having a constant phase shift Phase shifting circuit having a constant phase shift

2007-09-19

2009-11-24

Donovan, Lincoln (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

C327S244000

Reexamination Certificate

active

07622967

ABSTRACT:
Disclosed is a phase shifting circuit that includes a PLL loop in which a reference frequency received is branched into first and second signals. The first signal becomes one input to a phase comparator and the second signal becomes another input to the phase comparator after being shifted in phase via a phase shifter. The output of the phase comparator is supplied to one input terminal of a differential amplifier via a low-pass filter. The amount of phase shift of the phase shifter is controlled by the output signal of the differential amplifier. The amount of phase shift of the phase shifter is decided by a reference voltage applied to another input terminal of the differential amplifier.

REFERENCES:
patent: 4450410 (1984-05-01), Kliger et al.
patent: 5208546 (1993-05-01), Nagaraj et al.
patent: 6057723 (2000-05-01), Yamaji et al.
patent: 6157235 (2000-12-01), Bautista et al.
patent: 6876185 (2005-04-01), Niratsuka
patent: 2005/0253633 (2005-11-01), Kimura
patent: 10-200376 (1998-07-01), None

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