An accurate AC characteristic table look-up model for VLSI analog circuit simulation applications

Abstract

Abstmct -This paper presents a new accurate table look-up method for modeling both I-V characteristics and C-V &or Q-V characterisn'cs of deep submicron MOSFETs for VLSI analog circuit simulation. Based on the linear and q e a t i c isoparametric shape functions, the proposed table look-up approach can accurately model complicated AC characteristics of MOSFETs. The charges and capacitances derived through integration of C-V characteristics and differentiation of Q-V characteristics match the original measured data at table grid points. The proposed table lookup model accurately fitted the deep submicron MOSFET's I-V characteristics as well. It is, therefore. shown that AC small-signal and transient simulations of CMOS operational amplifier circuits uring the proposed table look-up approach are exactly matched to those with Ward & Dutton model in SPICE2 when AC table &ta are generated from Ward & Dutton model.