90-degree phase shifter

Details 90-degree phase shifter 90-degree phase shifter

2008-03-11

2008-03-11

Phu, Phuong (Department: 2611)

Pulse or digital communications

Miscellaneous

C375S329000, C375S261000, C375S279000, C327S231000, C327S255000, C327S238000

Reexamination Certificate

active

11007212

ABSTRACT:
The 90-degree phase shifter of the invention has: a T flip-flop including transistors Q3to Q6and Q9to Q12that together constitute a dual differential circuit, input transistors Q1and Q2that receive at their bases an input signal, and input transistors Q7and Q8that receive at their bases a signal complementary to the input signal; variable current sources14to17connected respectively to the nodes between the individual input transistors and the dual differential circuit; and a 90-degree phase comparator10that compares the phase differences between the signals outputted from the T flip-flop to output signals commensurate with the deviations of those phase differences from 90 degrees. The variable current sources14to17are controlled by signals based on the signals outputted from the 90-degree phase comparator10. This configuration more surely yields output signals with a phase difference of exactly 90 degrees.

REFERENCES:
patent: 4663594 (1987-05-01), Perkins
patent: 4857777 (1989-08-01), Altes
patent: 6160434 (2000-12-01), Yoshimura et al.
patent: 6356131 (2002-03-01), Kuwano
patent: 6903591 (2005-06-01), Arimura et al.
patent: 7-30346 (1995-01-01), None
patent: 8-70464 (1996-03-01), None
patent: 8-237077 (1996-09-01), None
patent: 2002-152011 (2002-05-01), None

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