Amplifier Circuits and Methods of Amplifying an Input Signal

摘要

A method of operating an amplifier circuit having a pre-charge phase and a sample/conversion phase includes, during a pre-charge phase, charging first and second capacitors to first and second bias voltages. The first capacitor is coupled to a first input of an amplifier circuit, which has a second input and an output. The second capacitor is coupled to the second input. During a sample/conversion phase, the first input of the amplifier circuit is coupled to an input signal through the first capacitor to level-shift the input signal according to the first bias voltage and the output of the amplifier is coupled to the second input through the second capacitor to level shift a feedback signal according to the second bias voltage.

主权项

1. A method of operating an amplifier circuit having a pre-charge phase and a sample/conversion phase, the method comprising:
during a pre-charge phase:
charging a first capacitor to a first bias voltage, the first capacitor coupled to a first input of an amplifier circuit having a second input and an output;charging a second capacitor to a second bias voltage, the second capacitor coupled to the second input; and during a sample/conversion phase:
coupling the first input of the amplifier circuit to an input signal through the first capacitor to level-shift the input signal according to the first bias voltage; andcoupling the output of the amplifier to the second input through the second capacitor to level shift a feedback signal according to the second bias voltage.