Capacitive programmable gain amplifier

摘要

An apparatus includes an operational amplifier and a plurality of capacitors coupled to an input terminal of the operational amplifier and configured to be selectively coupled to receive one of an input voltage signal and an output voltage signal of the operational amplifier.

主权项

1. An apparatus comprising:
an operational amplifier; a plurality of capacitors coupled to an input terminal of the operational amplifier, the plurality of capacitors comprising a first capacitor and a second capacitor; a first switch coupled to the first capacitor, the first switch configured to selectively couple the first capacitor to receive an input voltage signal of the operational amplifier or to receive an output voltage signal of the operational amplifier; and a second switch coupled to the second capacitor, the second switch configured to selectively couple the second capacitor to receive the input voltage signal or to receive the output voltage signal, wherein selectively coupling the second capacitor to receive the input voltage signal or to receive the output voltage signal occurs independently of the coupling of the first capacitor to receive the input voltage signal or to receive the output voltage signal.