Compact MMIC tunable biphase modulator and method

Details Compact MMIC tunable biphase modulator and method Compact MMIC tunable biphase modulator and method

1994-06-21

1995-09-19

Lee, Benny

Modulators

Phase shift keying modulator or quadrature amplitude modulator

332105, H03C 300

Patent

active

054519136

ABSTRACT:
An apparatus for providing electronically tunable biphase modulation. The apparatus includes an input for supplying a signal to be modulated and a coupler including first, second, third and fourth ports. The first port is coupled to the input. The apparatus also includes a first switch coupled to the second port. The first switch operates in response to a modulating signal. The apparatus further includes a first reactance element coupled to the first switch, an output coupled to the third port, a phase-shifting network coupled to the fourth port, a second switch coupled to the phase-shifting network and a second reactance element coupled to the second switch. The second switch operates in response to a modulating signal.

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"A Lumped Element Rat Race Coupler" from Applied Microwave, by Samuel J. Parisi, Mitre Corp., Bedford, Mass., Aug./Sep. 1989.
"A Monolithic Image-Rejection Mixer On GaAs Using Lumped Elements*" by John Putnam and Richard Puente, M/A-Com Advanced Semiconductor Operations, Lowell, Mass., from Microwave Journel, Nov. 1987.

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