| 摘要 |
An operational amplifier with a first stage differential input circuit having low aspect ratio devices of size chosen to achieve a low offset voltage, and an output stage having high aspect ratio devices able to operate at higher frequencies than the input stage, provides an amplifier with low static offset and requiring only a small compensation circuit due to the wide separation of frequency response poles. Adding a third stage gives a high gain design that can be stabilized with nested miller compensation. Adding a second differential input circuit of the same type as the first, and a level shifter, provides rail-to-rail operation without disturbing the low offset properties.
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