Triple comparator circuit
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United States of America Patent
Stats
-
May 19, 1992
Grant Date -
N/A
app pub date -
Jun 8, 1990
filing date -
Jun 8, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A comparator which is used to compare two analog voltages and provide a single ended output comprises three CMOS differential amplifiers. The use of three differential amplifiers provides improved matching of input capacitance, and a reduction in propagation delay over prior art use of a single differential amplifier. The comparator may be adopted for use in certain CMOS processes to extend the maximum operating voltage by limiting the internal node voltages otherwise subject to damage from impact ionization. An alternative embodiment is disclosed for comparing two analog voltages that are outside the power supply voltage range.
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