Differential amplifier with input bias current cancellation
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United States of America Patent
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Jun 27, 1989
Grant Date -
N/A
app pub date -
Dec 9, 1987
filing date -
Dec 9, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A bias current cancellation circuit provides current to the bases of a pair of transistors forming a differential amplifier. A transistor of matched characteristics to the differential amplifier pair is operated so that its base current replicates the base currents of the differential transistor pair. This replicated base current is inverted by a current mirror which is connected to the bases of the differential transistional pair. A second order cancellation error caused by base current differences in the current mirror is cancelled by a feedback circuit so that only the base current of the matching transistor affects the currents supplied to differential amplifier.
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