Optically coupled isolator circuit having increased common mode

Details Optically coupled isolator circuit having increased common mode Optically coupled isolator circuit having increased common mode

1975-06-30

1976-08-31

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Signal isolator

357 19, G02B 2700

Patent

active

039783430

ABSTRACT:
In a common package, a light emitter, which is responsive to an input signal, produces an output optical signal which is coupled through an optically transmissive electrical insulator to a principal photodetector disposed in stray capacitive coupled relation to the light emitter for detecting the optical signal to produce an output signal in response thereto. A dummy photodetector, which has similar electrical characteristics to that of the principal photodetector except that it is rendered nonresponsive to the output optical signal is similarly coupled in stray capacitive relation to the light emitter to derive a dummy output signal. The dummy signal together with the principal output signal are fed to the differential input terminals of a differential amplifier which takes the difference of the two signals, thereby cancelling common mode signal components capacitively coupled to said photodetector and producing an amplified output signal.

REFERENCES:
patent: 3045125 (1962-07-01), Mason
patent: 3179805 (1965-04-01), Astheimer
patent: 3436548 (1969-04-01), Biard et al.

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