Low-power current mirror having feedback with optical isolation

Radiant energy – Photocells; circuits and apparatus – Signal isolator

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307311, 604 20, 250214A, G02B 2700, H03K 342, A61N 130

Patent

active

052834417

ABSTRACT:
An optically isolated current mirror provides an isolated output signal as a function of an input signal. The mirror includes first and second optical isolators and an amplifier. The amplifier is connected to the first and second optical isolators in a voltage follower configuration which supplies the output signal as a function of an isolated control signal and an isolated feedback signal. The first optical isolator is connected between a source of the input signal and the amplifier. The first optical isolator includes a photosensitive np junction which generates the isolated control signal as a function of the input signal. The second optical isolator is connected to the amplifier in a feedback loop. The second optical isolator includes a photosensitive np junction which generates the isolated feedback signal as a function of the output signal.

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Siemens Data Book, IL300 Linear Optocouplers (April 1991).

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