Automatic gain control for interferometers and phase sensitive d

Details Automatic gain control for interferometers and phase sensitive d Automatic gain control for interferometers and phase sensitive d

1990-06-18

1991-12-10

Heyman, John S.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307491, 328161, H03K 526

Patent

active

050721402

ABSTRACT:
An automatic gain control circuit for an interferometer or a phase sensitive detector reduces sensitivity to fluctuations in amplitude of input signals. A pair of currents from the phase sensitive detector that represents a detected phase difference are input to an automatic gain control ratio detector. The output of the automatic gain control ratio detector is a function of the ratio of the difference and sum of the phase sensitive detector currents that is substantially independent of intensity or amplitude fluctuations of the input signals.

REFERENCES:
patent: 3689752 (1972-09-01), Gilbert
patent: 3955096 (1976-05-01), Faulhaber
patent: 4311928 (1982-01-01), Hirata et al.
patent: 4353000 (1982-10-01), Noda
"A New Wide-Band Amplifier Technique", Barrie Gilbert, IEEE Journal, vol. SC-3, No. 4, Dec. 1968.
"Gallium Arsenide Integrated Circuit Testing Using Electrooptic Sampling", Kurt J. Weingarten, Ultrafast Electronics Laboratory, Stanford University, Stanford, Calif., Dec. 1987.

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