CLASS AB UNITY-GAIN BUFFER AMPLIFIER FOR CMOS TECHNOLOGY
Original Publication Date: 2000-Jan-01
Included in the Prior Art Database: 2002-Sep-12
The circuit was developed to allow a CMOS operational amplifier or operational transconduc- tance amplifier, which typically have fairly high impedance outputs, or lose considerable gain if loaded resistively, to drive a low resistance load without gain impairment. The circuit is a unity gain amplifier that performs the same function as the well-known source or emitter (in the case of bipolar) follower. However, it has the advantage of zero input-output offset, symmetrical source and sink capability and with AI3 biasing it can source or sink a current greater than its quiescent current.