Phase modulator operated in saturation and with small angle modu

Details Phase modulator operated in saturation and with small angle modu Phase modulator operated in saturation and with small angle modu

1990-12-20

1992-06-30

Grimm, Siegfried H.

Modulators

Phase shift keying modulator or quadrature amplitude modulator

Including discrete semiconductor device

332146, 375 52, 375 67, 455 42, 455110, H03C 302, H04L 2720

Patent

active

051266989

ABSTRACT:
An input carrier signal is applied to two paths. The two paths are such that the phase difference between the output of the two paths is substantially 90.degree.. At least one of the two paths responds to a modulating signal to select the polarity of the phase difference between the outputs of the two paths. The two paths are such that the phase angle between the output and input of the modulator is substantially independent of the amplitude of the modulating signal. In specific embodiments, one of the two paths includes a mixer or a quadrature hybrid with reflective diodes where the mixer or the diodes are operated in saturation. The outputs of the two paths are combined to provide a modulated carrier signal.

REFERENCES:
patent: 3686588 (1972-08-01), Jackson et al.
patent: 4013960 (1977-03-01), Godet
patent: 4021758 (1977-05-01), Standing
patent: 4056792 (1977-11-01), Horwitz et al.
patent: 4153994 (1979-05-01), Ren
patent: 4168397 (1979-09-01), Bradley
patent: 4205282 (1980-05-01), Gipprich
patent: 4549152 (1985-10-01), Kumar
patent: 4736170 (1988-04-01), Wu et al.

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