Differential amplifier
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United States of America Patent
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-
Sep 19, 2000
Grant Date -
N/A
app pub date -
May 8, 1998
filing date -
May 8, 1998
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A differential amplifier that includes both a main differential pair of transistors and an auxiliary differential pair of transistors of like conductivity type that are operated in a complementary mode with respect to the main differential pair. A monitoring circuit measures the current to the load from the main pair and varies the current to the load from the auxiliary pair to keep the total current to the load substantially constant, as the common-mode amplitude of the input differential signal varies. This serves to increase the effective dynamic range of the differential amplifier.
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