Cascode and Transconductance with Capacitances Feedback Compensation for Multistage Amplifiers Driving No Load and 1nF Capacitive Load

摘要

A cascode and transconductance with capacitances feedback compensation (CTCFC) for multistage amplifiers is proposed in this paper. By adding a transconductance with capacitor feedback across the output stage, the shorting effect of this capacitor is eliminated, which enlarges the gain at higher frequency region. This capacitor can also help stabilize no load configuration. The other compensation capacitor through cascode from the output to the first stage simplifies the circuit and provides zeros to further increase the bandwidth. The proposed technique has been verified by an implementation in a 0.6μm CMOS process. The gain-bandwidth product (GBW) is 3.6MHz under a capacitive load of 1nF. The slew rate is 2.6V/μs and the current consumption is 88μA which shows an improvement in IFOML performance.