Patent ID: 6906591

Claim:
An amplifier comprises: a transistor having a gate, a drain, and a source, wherein the source of the transistor is operably coupled to a voltage node; a current source operably coupled to provide a current to the drain of the transistor; a Metal Oxide Semiconductor (MOS) capacitor having a gate, a drain, a source, and a well, wherein the drain, the well, and the source of the MOS capacitor are coupled together to form a first plate of the MOS capacitor and the gate of the MOS capacitor provides a second plate of the MOS capacitor, wherein the second plate of the MOS capacitor is operably coupled to the gate of the transistor, wherein the drain of the transistor provides an output for the amplifier and the gate of the transistor provides an input of the amplifier; and a level shifting module operably coupled to the first plate of the MOS capacitor such that the level shifting module shifts a gate-source voltage of the MOS capacitor to reduce variances of capacitance of the MOS capacitor such that bandwidth of the amplifier is limited and the amplifier is stable.