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A new two-stage Op-Amp using gate-driven, and positive feedback techniques

This paper describes the design and simulation of a new high-gain, low-power two-stage Op-Amp in a 0.18µm CMOS technology. Using both the gate-driven transistor and positive feedback concepts, the DC-gain of the conventional two-stage Op-Amp is increased about 20dB while power dissipation is approximately unchanged. Both the analytical and simulation results show that although the DC-gain will increase about 20dB but no significant change will be made in the unity-gain bandwidth of the circuit. Besides, the settling behavior of the proposed circuit is verified by employing the Op-Amp in a flip-around sample-and-hold. It is shown that the proposed Op-Amp has better settling behavior than its conventional counterpart.