CMOS Operational amplifier with improved frequency compensation
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United States of America Patent
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-
Feb 9, 1982
Grant Date -
N/A
app pub date -
Sep 27, 1979
filing date -
Sep 27, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An operational amplifier circuit comprised of complementary MOS transistors and having a bias section, a differential amplifier section, a level shift stage and an output stage, provides for frequency compensation using two capacitors. One capacitor, connected between the differential amplifier section and the output stage through a CMOS transmission gate that functions as a resistor, acts as the dominant pole of the transfer function. A second capacitor between the amplifier section output node and a level shift transistor, functions to remove the secondary poles in the transfer function and cause the dominant pole to occur at a higher frequency.
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