Using TriQuint Model (TOM) Extensions to LEVEL=3

TOM "TriQuint's Own Model" (See A.J. McCamant, G.D. Mc Cormack, and D.H.Smith, An Improved GaAs MESFET Model for SPICE, IEEE) is implemented as part of the existing GaAs LEVEL 3 model. See W.Curtice, A MESFET Model For Use In the Design of GaAs Integrated Circuits, IEEE Tran, Microwave and H.Statz, P.Newman, I.W.Smith, R.A. Pucel, and H.A. Haus, "GaAs FET Device And Circuit Simulation in SPICE".

There are a few differences from the original implementation. The Star-Hspice version of the TOM model takes advantage of existing LEVEL 3 features to provide:

Subthreshold model (NG, ND)
Channel and source/drain resistances, geometrically derived from width and length (RD, RG, RS, RSH, RSHG, RSHL, HDIF, LDIF) (ACM=1)
Photolithographic compensation (LDEL, WDEL, ALIGN)
Substrate terminal
Geometric model with width and length specified in the element (ACM=1)
Automatic model selection as a function of width and length (WMIN, WMAX, LMIN, LMAX)
User-defined band-gap coefficients (EG, GAP1, GAP2)

Several alias TOM parameters are defined for existing Star-Hspice LEVEL 3 parameters to make the conversion easier. An alias allows the original name or the alias name to be used in the .MODEL statement. However, the model parameter printout is in the original name. Please note that in two cases, a sign reversal is needed, even when using the TOM parameter name.

Alias	HSPICE Printout Name	Note
Q	VGEXP
GAMMA	GAMDS	sign opposite of TriQuint's original
VTOTC	TCV	sign opposite of TriQuint's original
TRG1	TRG
TRD1	TRD
TRS1	TRS

TOM Model Parameters

Name (Alias)	Description
BETATCE	Temperature coefficient for BETA If betatce is set to a nonzero value: The more common HSPICE Beta temperature update is:
DELTA	Ids feedback parameter of the TOM model. This parameter is not used if its value is zero. DELTA can be negative or positive.
CAPDS	Drain-to-source capacitance

Name (Alias)

Description

BETATCE

Temperature coefficient for BETA

If betatce is set to a nonzero value:

The more common HSPICE Beta temperature update is:

DELTA

Ids feedback parameter of the TOM model. This parameter is not used if its value is zero. DELTA can be negative or positive.

CAPDS

Drain-to-source capacitance

NOTE: In the original TOM implementation by TriQuint, parameters LAMBDA and UCRIT do not exist. Therefore, they must remain zero (their default value) in HSPICE LEVEL 3 in order to reproduce the TOM model. Use of nonzero values for these parameters with nonzero BETATCE, DELTA, or CAPDS results in a hybrid model.

Star-Hspice Manual - Release 2001.2 - June 2001