Continuously variable constant-attenuation phase shifter

Details Continuously variable constant-attenuation phase shifter Continuously variable constant-attenuation phase shifter

1998-04-02

2000-08-15

Hoff, Marc S.

Data processing: measuring, calibrating, or testing

Testing system

Of circuit

702 66, 702 68, 702106, 714724, G01R 3128

Patent

active

061049867

ABSTRACT:
A method and apparatus for a phase shifter includes a controller controlling a voltage controlled phase shifting circuit for shifting the phase of a high frequency input signal. The phase shifting circuit includes microstrip elements arranged in a 3 dB hybrid structure, and also includes first and second reverse-biased diodes electrically connected to the microstrip elements and operating as varactors. The controller drives a D/A converter to control the bias voltage of the phase shifting circuit and thereby to adjust the phase shift of a high frequency output signal relative to the high frequency input signal.

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