CMOS differential-amplifier sense amplifier
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United States of America Patent
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Dec 13, 1988
Grant Date -
N/A
app pub date -
Apr 10, 1987
filing date -
Apr 10, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A CMOS sense amplifier for use in a memory comprises two CMOS differential amplifiers. Each differential amplifier receives the same two signals generated from a selected bit line pair and each provides a different one of a complementary pair of signals. Each differential amplifier has a current mirror for loads. Each differential amplifier uses a transistor current source. A transistor will operate as a more ideal current source if it is in saturation. The transistor current source is biased by the current mirror of the differential amplifier of which it is a part. The resulting differential amplifier thus has a transistor current source which is biased closer to saturation than if biased by a normal clock signal which is either at the high or low power supply voltage. The self-biasing aspect avoids the problems associated with generating a special reference voltage for the differential amplifier.
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