Method and apparatus for improving current matching in an electronic circuit
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United States of America Patent
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Sep 2, 2003
Grant Date -
N/A
app pub date -
Jun 7, 2001
filing date -
Jun 7, 2001
priority date (Note) -
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Abstract
A Sauer diode circuit is arranged to introduce a signal into a circuit to compensate for mismatch effects to various parameters in a current mirror circuit. Current matching between transistors is improved by providing matched errors such as forward current gain (Beta), early voltage, transconductance, channel-length modulation, as well as other sources of matching errors. The Sauer diode includes a series of transistors that are arranged to operate as a diode circuit that has errors that are matched to other components in an application circuit. Example application circuits include, but are not limited to reference circuits, operational amplifiers, comparators, analog-to-digital converters, digital-to-analog converters as well as other circuits that employ current mirror circuitry. The Sauer diode may be implemented in a single transistor technology such as MOS, BJT, FET, or a number of mixed technologies such as BiCMOS, BiFET and the like.
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