Hi, I am familiar with different spice simulators. I have used PSpice when i was BS student. I am expert in HSpice and Spectre and ELDO. To my mind all the circuit simulator in spice level look likes similar and the model file availability is different, Ofcourse in higher level simulation we can find some capabilities. I found Linear's LTSPICE similar. I have strong background in analog design and i know Butterworth, Bessel, Chebyshev ... filters. Please consider me as candidate, I am ready to work for you.