Txxxxxxx

Transmission Lines (Lossless): This device is translated as an ideal 4-terminal transmission line.

Example SPICE Command Line:

t1 1 0 2 0 z0=50 TD=10ns IC=1mv, 1ma, .2mv, .6ma
t2 1 0 2 0 z0=50 F=1.7GHz NL=0.3
t3 1 0 2 0 z0=50 F=1.2GHz

SPICE dialect and netlist syntax:

Spice2/3:

tid n1 n2 n3 n4 Z0=zval[[TD=tval ] | [F=fval[ NL=nval]]]
+ [IC=v1, i1, v2, i2]

PSpice:

tid n1 n2 n3 n4 [ model ] Z0=zval[[ TD=tval ] | [F=fval[ NL= nval ]]]
+ [IC=v1, i1, v2, i2]

HSpice:

tid n1 n2 n3 n4 [ model ] Z0=zval [[ TD=tval [L= l ]] |
+ [F=fval [NL=nval]]] [IC=v1, i1, v2, i2]

ADS Netlist Syntax:

If TD is given:

TLIN4: tid n1 n2 n3 n4 Z=zval F=1 E=tval*360

If F is given:

TLIN4: tid n1 n2 n3 n4 Z=zval F=fval E=nval*360

ADS Schematic Symbol:

Instance Parameters:

tid = TL element name
n1, n2 = Nodes at port 1
n3, n4 = Nodes at port 2
zval = Characteristic impedance
tval, fval = Length of line may be expressed in either of two forms. The transmission delay (TD) may be specified directly or frequency (F) may be given together with NL.
nval = Normalized electrical length of the transmission line with respect to the wavelength in the line frequency. If F is specified but NL is omitted, 0.25 is assumed.
v1, i1, v2, i2 = The voltage and current at each of the transmission line ports. Ignored translation.

Comments:

PSpice:

Optional lossy format: n1 n2 n3 n4 LEN=len R=r L=l G=g C=c

R and G are not supported for the schematic version. For the netlist version, the alternate component TL will be used so these values are handled properly.

ADS Netlist Syntax:

TL:tid n1 n2 n3 n4 Z=sqrt(l/c) L=len V=1/(c0*sqrt(l*c)) R=r G=g F=0

If a model reference is used, the model is read and parameters are used on the device as needed. No model is placed and unused parameters are discarded.

HSpice:

Optional syntax: tid n1 n2 n3 n4 Z=zval l=len

translates as: TLIN4:tid n1 n2 n3 n4 z=zval F=1 E=(len/c0)*360

c0 = speed of light in free space. This is an ADS mathematical constant.