CMOS amplifier with offset adaptation
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United States of America Patent
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-
Apr 28, 1992
Issued Date -
N/A
app pub date -
Oct 31, 1990
filing date -
Dec 9, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An integrated circuit amplifier having a random input offset voltage is adaptable such that the input offset voltage may be cancelled out. An inverting input node is a floating input node and is coupled to a source of input signal by a first capacitor. A second capacitor is connected between the output of the amplifier and the floating node. An ultraviolet window above the second capacitor allows the floating node to be charged, by the application of ultraviolet light, to a voltage which effectively cancels the input offset voltage. The ultraviolet window and capacitor electrodes are arranged such that the ultraviolet light may strike only the desired areas of the structure.
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