Accurate analog modeling of short channel FETs based on table lookup

Author

Rofougaran, A.R. ; Furman, B. ; Abidi, A.A.

Author_Institution

Integrated Circuits & Syst. Lab., California Univ., Los Angeles, CA, USA

fYear

1988

Firstpage

413

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. 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 a 2-3* improvement in total simulation time of a ring oscillator over the BSIM model in SPICE. The model affords a global accuracy of 4% in the L/sub D/-V/sub DS/ characteristics of 1- mu m enhancement and depletion MOSFETs.<>

Keywords

insulated gate field effect transistors; semiconductor device models; table lookup; 1 micron; BSIM model; MOSFETs; SPICE 3; analog circuit design; channel lengths; data points; global accuracy; incremental parameters; output conductance; ring oscillator; short channel FETs; substrate effects; subtable; table lookup; transconductance; Analog circuits; Circuit simulation; FETs; Integrated circuit modeling; MOSFETs; SPICE; Spline; Table lookup; Transconductance; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 1988., IEEE International Symposium on

Conference_Location

Espoo, Finland

Type

conf

DOI

10.1109/ISCAS.1988.14952

Filename

14952