A Miller-compensated amplifier with Gm-boosting

A two-stage Miller-compensated amplifier with Gm-boosting (MCG) is introduced in this paper. The design involves the conventional two-stage amplifier and a proposed wide-bandwidth scalar circuit that amplifies the output signal voltage at the first stage of the conventional two-stage amplifier. The wide-bandwidth scalar circuit has very short delay so that the non-dominant pole and right-half-plane zero are moved to higher frequencies. The proposed MCG method is able to enhance the unity-gain frequency (UGF) and the phase margin (PM) of the two-stage amplifier. By deploying the current starving approach, the power consumption of proposed amplifier is also brought down. Using a standard 130-nm CMOS technology, simulation results show that the improved MCG amplifier driving a 100-pF load capacitance achieves a gain of 86.83 dB. The UGF is 2.48 MHz and the PM is 60.7°.