Modulators – Amplitude modulator – Nonlinear device controlled by modulating signal
Patent
1982-10-15
1985-06-18
LaRoche, Eugene R.
Modulators
Amplitude modulator
Nonlinear device controlled by modulating signal
332 22, 455 42, H03C 300
Patent
active
045243360
ABSTRACT:
A wide range reflective phase shifter/modulator including a 3dB hybrid splitter having ports A, B, C and D. An input signal to be phase modulated is applied to port-A and the phase modulator output signal is derived from port-C. Ports B and D are terminated with reactive circuits, which must be identical, including four variable reactive elements such as varactor diodes, the capacitance of which can be controlled by a modulating control voltage. By controlling the capacitance of the varactor diodes, the amount of phase shift in the signal derived from port-C is controlled. An alternative embodiment includes a circulator having ports E, F and G. An input signal to be phase modulated is applied to port-E and the phase modulator output signal is derived from port-G. Port-F is terminated with a reactive circuit, which includes two variable reactive elements such as varactor diodes, the capacitance of which can be controlled by a modulating control voltage. By controlling the capacitance of the varactor diodes, the amount of phase shift in the signal derived from port-G is controlled.
REFERENCES:
patent: 3409845 (1968-11-01), Ogi et al.
patent: 3569866 (1971-03-01), Hearn
patent: 3739301 (1973-06-01), Garver
patent: 3967217 (1976-06-01), Solomon
patent: 4055822 (1977-10-01), Rinderle
patent: 4216542 (1980-08-01), Hermesmeyer
General Electric Company
LaRoche Eugene R.
Pascal Robert J.
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