Surface wave device angle modulator

Details Surface wave device angle modulator Surface wave device angle modulator

1974-11-11

1976-04-06

Kominski, John

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

325449, 331107A, 333 30R, H03C 328

Patent

active

039493245

ABSTRACT:
A system for generating angular modulation comprising a balanced modulator and an adding circuit to which a surface wave device quadrature oscillator applies two signals at the carrier frequency differing 90.degree. in phase, such phase difference being accurately maintained independent of aging and variations in operating temperatures. More particularly, an information signal is applied to one input of the balanced modulator, the output of which is applied to the adding circuit. The surface wave device oscillator completes the system by applying an in-phase carrier frequency to a second input of the balanced modulator and a carrier frequency shifted 90.degree. in phase to a second input of the adding circuit. Angular modulation is thus produced at the output of the adding circuit.

REFERENCES:
patent: 3582540 (1971-06-01), Adler et al.
patent: 3750027 (1973-07-01), Hartmann
patent: 3869682 (1975-03-01), Heeks et al.
patent: 3875517 (1975-04-01), Dilley
patent: 3878477 (1975-04-01), Dias et al.
crabb et al., "Surface-Acoustic-Wave Oscillators: Mode Selection and Frequency Modulation," Electronic Letters, 17th May 1973, Vol. 9, No. 10, pp. 195-197.

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