Synthetic heterodyne demodulator circuit

Details Synthetic heterodyne demodulator circuit Synthetic heterodyne demodulator circuit

1990-11-09

1993-05-18

Eisenzopf, Reinhard J.

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency or phase modulation

455306, 455313, 329325, 25022727, 356345, 359191, H04B 1006

Patent

active

052128253

ABSTRACT:
An improved synthetic heterodyne demodulator circuit. The circuit is arranged to accept the output signal s(t) from an interferometric sensor with large amplitude sinusoidal phase modulation (phase-generated carrier). The phase modulation amplitude is adjusted such that a selected pair of odd and even carrier harmonics are equal. The quadrature signal components are first extracted from the phase-generated carrier using standard homodyne techniques. The quadrature signal components are then used to AM-modulate a pair of equal-amplitude quadrature carrier components at an arbitrary frequency .omega..sub.c, and summed. The result is a conventional PM modulated carrier which can be demodulated using standard FM techniques, followed by integration, to recover with high fidelity the sensed information.

REFERENCES:
patent: 3501705 (1970-03-01), Lukens
patent: 4910800 (1990-03-01), Chung
Hindin et al., Fiber Optics adopts superheterodyne principles; Electronics vol. 53, #25, Nov. 20, 1980, pp. 73-4.

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