Title :
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
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;
Conference_Titel :
Circuits and Systems, 1988., IEEE International Symposium on
Conference_Location :
Espoo, Finland
DOI :
10.1109/ISCAS.1988.14952
