BSIM4 to PSP Model Conversion: A Case Study

BSIM4 model is not suitable for distortion analysis of circuits with bias point VDS 1⁄4 0, such as passive mixers and RF switches, due to discontinuities in higher order derivatives. Surface potential based PSP model has continuous derivatives to at least third-order, and is therefore suitable for intermodulation products simulation. This paper presents the case study of BSIM4 to PSP model conversion °ow and comparison of active and passive mixers and SPDT RF switch simulation results. Simulation results show good agreement of original BSIM4 and converted PSP models' CV, IV, compression point, conversion loss and noise ̄gure, which validates the conversion °ow. The converted model has a correct third-order intermodulation products (IM3) slope of three, allowing the simulation of intermodulation products, which was not possible with the original BSIM4 model.