HSPICE Projects
In this project, I designed and simulated, using HSPICE, a two stage CMOS operational amplifier based on the 0.35μmprocess. I introduced two design topologies that meet the following specifications,as outlined in the table below. Both designs use a nulling resistor to boost the gain magnitude while keeping the phase margin under control, so that the system is stable.
The nulling resistor can be used to either eliminate the Right Hand Plane, RHP, zero or move it to the Left Hand Plane, LHP. I implemented the nulling resistor using an NMOS operating in triode mode, instead of a discrete resistor, for better circuit performance, and more control of the trans-conductance gm.
The designed operational amplifier in both designs is meant to meet the specifications, even when there is a ±10% variation of the DC input of the supply voltage, Vdd. The entire discussions and results are in the link blow:
Design of a Two Stage CMOS Differential Input Opamp
Youtube presentation:
https://www.youtube.com/watch?v=_NnF1yAMm-I&t=281s
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Embedded Design 