Quadraphase modulator

Details Quadraphase modulator Quadraphase modulator

1976-02-06

1977-03-22

Kominski, John

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

325 47, 325 60, 325126, 332 9R, 332 21, H03C 300

Patent

active

040139603

ABSTRACT:
A first hybrid circuit receives a RF carrier signal and provides two equal amplitude in phase RF carrier signals each phase modulated in a different phase modulator by a different digital baseband signal. The two resultant modulated signals provide input signals to a fourport hybrid circuit. This hybrid circuit produces a difference signal and a sum signal from the two input signals. The difference signal is phase shifted a predetermined amount in a fixed phase shift device. The phase shifted difference signal and the sum signal are combined in a second hybrid circuit to provide a quadraphase output signal which is coupled to a transmitting antenna through a hard limiting amplifier.

REFERENCES:
patent: 3391339 (1968-07-01), Lynch
patent: 3686588 (1972-08-01), Jackson et al.
patent: 3710257 (1973-01-01), Low et al.
patent: 3961286 (1976-06-01), Kim

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