.pi./2 phase shifter

Details .pi./2 phase shifter .pi./2 phase shifter

1996-11-18

1999-10-05

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Phase shift by less than period of input

327244, 327238, 327155, H03K 3286, H03K 513, H03L 700

Patent

active

059630736

ABSTRACT:
The invention is directed to the realization of a .pi./2 phase shifter that provides accurate operation and moreover enables a reduction in current consumption. Such a .pi./2 phase shifter is constructed from a 1/2-frequency divider employing a T flip-flop and includes: a current source circuit which supplies to the T flip-flop a circuit current that determines the output frequency of the T flip-flop and which varies circuit current value according to control signals; and a frequency comparator that compares the output frequency of the T flip-flop and the local signal input frequency, and, based on the comparison results, varies the control signals in a direction such that the output frequency of the T flip-flop matches the local signal input frequency.

REFERENCES:
patent: 4730349 (1988-03-01), Wilhelm et al.
patent: 5179731 (1993-01-01), Trankle et al.
patent: 5200650 (1993-04-01), Cowley et al.
patent: 5230013 (1993-07-01), Hanke et al.
patent: 5359241 (1994-10-01), Hasegawa et al.
patent: 5446322 (1995-08-01), Reynolds
patent: 5497114 (1996-03-01), Shimozono et al.

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