Fast settling, wide dynamic range vector modulator

Details Fast settling, wide dynamic range vector modulator Fast settling, wide dynamic range vector modulator

1990-06-29

1994-10-11

Issing, Gregory C.

Wave transmission lines and networks

Attenuators

333 28R, 455304, 455289, H01P 122, H03H 500, H04B 110, H04B 118

Patent

active

053551036

ABSTRACT:
A fast settling, wide dynamic range vector modulator for use in an interference cancellation system or the like includes a quadrature hybrid which receives an RF signal and divides the signal into a primary in-phase component signal and a primary quadrature phase component signal. A first 180.degree. hybrid receives the primary in-phase component signal and provides first and second secondary in-phase component signals which are 180.degree. out of phase with each other. A second 180.degree. hybrid receives the primary quadrature phase component signal and provides first and second secondary quadrature phase component signals which are 180.degree. out of phase with each other. A first switching device selects one of the first and second secondary in-phase component signals, and a second switching device selects one of the first and second secondary quadrature phase component signals. First and second coarse attenuators respectively provide a selectable amount of attenuation to the selected in-phase and quadrature phase component signals. First and second fine attenuators provide fine attenuation to the coarse attenuated in-phase and quadrature phase component signals. A signal combiner combines the fine attenuated in-phase and quadrature phase component signals to provide the corresponding output signal.

REFERENCES:
patent: 3550041 (1969-08-01), Sauter
patent: 3699444 (1972-10-01), Ghose et al.
patent: 4016516 (1977-04-01), Sauter et al.
patent: 4737739 (1988-04-01), Rosier
patent: 4870658 (1989-09-01), Suzuki et al.

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