Go to www.awrcorp.com
Back to search page Click to download printable version of this guide.




STOM1 is a SPICE-equivalent implementation of the TOM1 model. It should be used where precise SPICE compatibility is needed.

Equivalent Circuit


Name Description Unit Type Default
ID Device ID Text F1
*VTO Nonscalable portion of Vt Voltage -2.5 V
*VTOSC Scalable portion of Vt Voltage 0 V
*ALPHA Drain I/V knee parameter   2
*BETA I/V Beta coefficient   0.01
*GAMMA AC drain term   0
*GAMMADC DC drain term   0
*Q I/V exponent   2
*DELTA I/V DELTA term   0
*VBI Gate junction built-in voltage Voltage 1 V
*IS Gate diode current parameter Current 10[1] mA
*N Gate diode ideality factor   1
*RIS Gate-source intrinsic resistance Resistance 0.001 ohm
*RID Gate-drain resistance Resistance 0.001 ohm
*TAU Gate-drain time delay Time 0 ns
*CDS Drain-source capacitance Capacitance 0 pF
*RDB RF drain-source resistance Resistance 106 Ohm
*CBS Capacitance that determines Rds break frequency Capacitance 0 pF
*CGSO Gate-source capacitance parameter Capacitance 0 pF
*CGDO Gate-drain capacitance parameter Capacitance 0 pF
*VMAX Capacitance limiting voltage   0.5
*DELTA2 Capacitance DELTA2 parameter   0.2
*FC Gate depletion cap. linearization parameter   0.5
*VBR Gate junction breakdown voltage Voltage 106 V
*RG Gate resistance; nonscalable part Resistance 0.001 ohm
*RD Drain resistance Resistance 0.001 ohm
*RS Source resistance Resistance 0.001 ohm
*RGMET Gate metalization res.; scales with AFAC & NFING Resistance 0.001 ohm
*TNOM Temperature Temperature 27 DegC
*LS Source inductance Inductance 0 nH
*LG Gate inductance Inductance 0 nH
*LD Drain inductance Inductance 0 nH
*P Noise par: P    
*Tg Noise par: gate noise temp    
*KF Flicker noise coefficient    
*AF Flicker noise exponent    
*FFE Flicker noise frequency exponent    
*NFLAG Noise model    
AFAC Gate width scale factor   1
NFING Number of fingers scale factor   1

* indicates a secondary parameter

Implementation Details

The implementation is identical toTOM1 except for the charge expressions, which are identical to SSTATZ.


This element does not have an assigned layout cell. You can assign artwork cells to any element. See “Assigning Artwork Cells to Layout of Schematic Elements” for details.

Legal and Trademark Notice