Patent ID: 9503078
Filing Date: 2016-11-22
CPC Classification: H03F,H03K

Claim Text:
1. A circuit comprising: a first capacitor; a second capacitor; a MOS (metal oxide semiconductor) transistor; an operational amplifier, wherein the first capacitor is configured to couple to the second capacitor via the MOS transistor; the operational amplifier is configured to receive a voltage at the first capacitor and output a control voltage; and the MOS transistor is configured to be controlled by the control voltage; a third capacitor; a fourth capacitor; and a second MOS (metal oxide semiconductor) transistor, wherein: the third capacitor is configured to couple to the fourth capacitor via the second MOS transistor; the operational amplifier is configured to receive a voltage at the third capacitor and output a second control voltage; and the second MOS transistor is configured to be controlled by the second control voltage.