Analog signal isolator

Details Analog signal isolator Analog signal isolator

1976-09-15

1978-01-03

Mullins, James B.

Amplifiers

Modulator-demodulator-type amplifier

330 59, H03F 338

Patent

active

040669734

ABSTRACT:
Isolating apparatus is disclosed which provides electrical isolation between an analog signal input and an equivalent analog signal output. The input analog signal is converted to a series of positive and negative pulses. Optical coupling devices are responsive to the series of positive and negative pulses for providing a series of similar positive and negative pulses which are electrically isolated but optically coupled. These isolated pulses are then converted to the equivalent analog signal output. The optical coupling comprises photo emitters one of which is activated when the analog to pulse converter output is positive and another of which is activated when it is negative. The photo emitters are operably associated with photo detectors which are operable in a switching mode. Feedback is not required around the optical coupling devices. An averaging circuit at the output provides an analog representation of the input signal.

REFERENCES:
patent: 3315176 (1967-04-01), Biard
patent: 3327239 (1967-06-01), Carpenter
patent: 3590251 (1971-06-01), Vosteen
patent: 3810034 (1974-05-01), Brunsch
patent: 3852731 (1974-12-01), Hollands
patent: 3893037 (1975-07-01), Herbert
patent: 3913001 (1975-10-01), Kayama
Witkover, "Pulse Width Modulated Optical Data Link", The Review of Scientific Instruments, vol. 40, No. 3, Mar. 1969, pp. 469-472.

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