Title :
Accurate analog modeling of short channel FETs based o table lookup
Author :
Rofougaran, A.R. ; Furman, B. ; Abidi, A.A.
Author_Institution :
Integrated Circuits & Syst. Lab., California Univ., Los Angeles, CA, USA
Abstract :
A table-lookup model for MOSFETs has been implemented in SPICE 3, to overcome the inadequacies of analytical models that are unable to represent short-channel effects. The model comprises a 2-D main table, a coarse 3-D subtable to incorporate substrate effects, and a table to interpolate between channel lengths. There are 370 data points stored altogether. The tables are constructed from the measurement of incremental parameters, and thus reproduce transconductance and output conductance accurately, making the model superior for analog circuit design. The approach demonstrates improvement of 2-3 in total simulation time of a ring oscillator over the BSIM model in SPICE. The model affords a global accuracy of 4% in the Id-I DS characteristics of 1-μm enhancement and depletion MOSFETS
Keywords :
circuit CAD; circuit analysis computing; insulated gate field effect transistors; semiconductor device models; software packages; table lookup; 2-D main table; BSIM model; MOSFET; SPICE 3; analog circuit design; analog modeling; coarse 3-D subtable; digital simulation; interpolation; output conductance; ring oscillator; semiconductor device models; short channel FETs; substrate effects; table lookup; transconductance; Analog circuits; Circuit simulation; FETs; Integrated circuit modeling; MOSFETs; SPICE; Spline; Table lookup; Transconductance; Voltage;
Conference_Titel :
Custom Integrated Circuits Conference, 1988., Proceedings of the IEEE 1988
Conference_Location :
Rochester, NY
DOI :
10.1109/CICC.1988.20856
