Compensation technique for feedback amplifiers

摘要

Compensation methods and systems for voltage-feedback amplifiers provide improved dynamic performance (i.e., increased bandwidth and the elimination or alleviation of a slew limitation) at various gains by self-adaptively changing the Miller effect with respect to the gain setting.

主权项

1. A system to extend a bandwidth and to improve slew behavior of a feedback amplifier, the system comprising:
a first amplifier having an input node, an output node, and an intermediate node; a first feedback path between the input node and the output node; and a second feedback path between the intermediate node and the output node, the first feedback path sharing at least a portion of the second feedback path, wherein a closed-loop 3 dB bandwidth is extended by a factor of1+A21+A2⁢β,wherein β is the feedback coefficient of the first feedback path and A2 is a gain between the intermediate node and the output node.