Abstract-Using a simplified high-frequency smallsignal equivalent circuit model for BSIM3 MOSFET, the fully differential two-stage folded-cascode CMOS operational amplifier is analyzed to obtain its smallsignal voltage transfer function. As a result, the expressions for dc gain, five zero frequencies, five pole frequencies, unity-gain frequency, and phase margin are derived for op amp design using design equations. Then the analysis result is verified through the comparison with Spice simulations of both a high speed op amp and a low power op amp designed for the 0.13 μm CMOS process.Index Terms-Differential two-stage folded-cascode CMOS op amp, equation-based circuit design, high speed, low power, pole and zero frequency, smallsignal transfer function, frequency response, BSIM3.