Digital adjustable phase modulator and method

Details Digital adjustable phase modulator and method Digital adjustable phase modulator and method

1994-07-18

1995-09-26

Grimm, Siegfried H.

Modulators

Phase shift keying modulator or quadrature amplitude modulator

332105, 332146, 375282, 375308, 455 42, 455111, H03C 322, H04L 2720

Patent

active

054537207

ABSTRACT:
A digital adjustable phase modulator and method includes a first circuit path and a second circuit path for a signal. A fixed bias voltage is coupled to the first circuit path and to the second circuit path which respectively include first and second active variable reactance components such as varactor diodes. The first circuit path and the second circuit path further include chip capacitors to provide a DC block for first and second MMIC single pole double throw switches, and transmission lines for the signal have a length of one-fourth of a wavelength of the signal to provide an RF short. A control voltage is coupled to the first and second varactor diodes such that the capacitances across the first and second varactor diodes changes, resulting in a phase difference between the signal traversing the first circuit path relative to the signal traversing the second circuit path.

REFERENCES:
patent: 3349342 (1967-10-01), Garver
patent: 4994773 (1991-02-01), Chen et al.
patent: 5081432 (1992-01-01), Devlin et al.
patent: 5148128 (1992-09-01), Mazumder

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