Tunable quadrature phase shifter

Details Tunable quadrature phase shifter Tunable quadrature phase shifter

2005-03-29

2005-03-29

Cunningham, Terry D. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Phase shift by less than period of input

C327S238000, C327S254000

Reexamination Certificate

active

06873198

ABSTRACT:
The present invention relates to a tunable quadrature phase shifter comprising an input (IN) for inputting an input signal (vin), splitting means (10) for splitting the input signal into two essentially orthogonal first and second signals (i1, i2), adding means (6) for adding said first and second signals (i1, i2), subtracting means (7) for subtracting said first and second signals (i1, i2), a first output (OUT+) for outputting a first output signal (vo1) based on the output signal from said adding means (6), and a second output (OUT−) for outputting a second output signal (vo2) based on the output signal from said subtracting means (7), wherein that said splitting means (10) is provided as an all-pass.

REFERENCES:
patent: 4109102 (1978-08-01), Yoshida et al.
patent: 4210882 (1980-07-01), Roza et al.
patent: 4806888 (1989-02-01), Salvage et al.
patent: 5333014 (1994-07-01), Drewery et al.
patent: 6054883 (2000-04-01), Ishihara
patent: 6369633 (2002-04-01), Tsukahara
patent: 6496545 (2002-12-01), Liu

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