Current mirror with low copying error
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United States of America Patent
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-
Apr 26, 1994
Grant Date -
N/A
app pub date -
Nov 12, 1992
filing date -
Nov 22, 1991
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
The disclosure relates to current mirrors in which a high level of copying error may arise out of the collapse of the gain of the transistors. The mirror includes, in its output arm, a 'Darlington' type amplifier subjected to feedback by a buffered mirror. The error gets cancelled for a gain .beta.=1. A second Darlington amplifier mounted symmetrically with the first Darlington enables the V.sub.CE values of the transistors to be balanced. The disclosed device can be applied to current mirrors when the transistors are low-gain transistors (.perspectiveto.1).
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