Low-power current mirror having feedback with optical isolation
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United States of America Patent
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Feb 1, 1994
Issued Date -
N/A
app pub date -
Nov 16, 1992
filing date -
Mar 13, 1992
priority date (Note) -
Expired
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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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