Synchronous detector

Details Synchronous detector Synchronous detector

1974-07-19

1976-05-04

Heyman, John S.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307233R, 307269, 328133, 307240, H03K 500

Patent

active

039551059

ABSTRACT:
A synchronous detector circuit provides a direct current output as a function of an alternating current input signal. Direct current and noise level in the input is removed in a circuit including filters and an operational amplifier and a parallel path feedback network, including in one branch a semiconductor and in a second branch a load and switching circuit synchronously operating with the alternating current input signal. The switching circuit may include a field-effect transistor switch made operative by a semiconductor switching off and on as a function of synchronously chopped light received by a photosemiconductor.

REFERENCES:
patent: 3517213 (1970-06-01), Britton
patent: 3631342 (1971-12-01), McDonald
patent: 3828259 (1974-08-01), Riethmuller

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