| 摘要 |
An amplifier circuit includes an input chopping circuit for chopping first and second input signals, a transconductance stage for amplifying an output of the chopping circuit and applying it to the input of a folded cascode stage, to the input of an un-chopping circuit, and to the input of a chopper-stabilized gain boost amplifier. The output of the un-chopping circuit drives sources of cascode transistors of the folded cascode stage. The gain boost amplifier includes another transconductance stage having another un-chopping circuit coupled to the gate of one of the cascode transistors of the folded cascode stage. The drains of cascode transistors of the folded cascode stage drive a class AB output stage. The amplifier provides both highly linear operation and low 1/f noise.
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