Patent ID: 9436023
Filing Date: 2016-09-06
CPC Classification: G02F,G09G,H03F

Claim Text:
1. An operational amplifier, comprising: a first metal-oxide-semiconductor field effect transistor (MOSFET), comprising a first drain, a first gate and a first source; a second MOSFET, comprising a second drain, a second gate and a second source, the second source coupled to the first source of the first MOSFET; and a bias source, coupled between a first specific voltage level and the first source of the first MOSFET and the second source of the second MOSFET; wherein the first MOSFET and the second MOSFET are depletion-type; wherein a first body of the first MOSFET and a second body of the second MOSFET are coupled to a second specific voltage level, and the second specific voltage level is equal to the first specific voltage level or between the first specific voltage level and a voltage level of the first source of the first MOSFET and the second source of the second MOSFET; wherein the first MOSFET and the second MOSFET are N-channel MOSFETs, and the first specific voltage level is a ground voltage level.