Abstract
A one-stage Folded Cascode Operational Amplifier with the self-biasing scheme for the PMOS differential input stage is designed by using LTspice simulator and the designing procedure is described. This folded op amp will have a high Common-mode input range (ICMR) and a high maximum voltage output thereby high gain. The LTspice simulation results correlate very well with the hand calculations obtained theoretical values. All the MOSFETs are kept in saturation to ensure high open loop gain. Then, a two-stage op amp circuit has been designed by assuming Zero (z)= 10 GB, and phase margin (PM= 68o). The obtained result of the output gain for this design was Avo= 91 dB, indicating that the design has a high gain.
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