Abstract—The CMOS differential amplifier with active load and single-ended output is one of the most popular circuits used in analog and mixed signal applications owing to its amazing performances. In this paper an op-amp of 2nd stage is designed for certain specifications such as gain and slew rate and its comparison analysis with a 1st stage is realized. The proposed classic two-stage op amp produces an open loop gain above 70 dB, gain- bandwidth product (GBW) of 11.43 MHz and 50.4o phase margin in 0.60 μm CMOS technology. The circuit is operated at the supply voltage of 3.3 V with power dissipation of 144.3 μW. The ability of the method adopted, to use the smaller compensation capacitor, Cc, which improves the slew rate, also beneficial for the area of compensation circuit.

Index Terms—gain bandwidth; slew rate; input common mode; common mode rejection ratio; power supply rejection ratio

Cite: Sadeque Reza Khan, "Design Analysis and Performance Comparison of Low Power High Gain 2nd Stage Differential Amplifier Along with 1st Stage," Jounal of Automation and Control Engineering, Vol. 3, No. 1, pp. 82-86, February, 2015. doi: 10.12720/joace.3.1.82-86