## 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:**

tidn1n2n3n4Z0=zval[[TD=tval] | [F=fval[NL=nval]]]

+ [IC=v1,i1,v2,i2]

**PSpice:**

tidn1n2n3n4[model]Z0=zval[[TD=tval] | [F=fval[NL=nval]]]

+ [IC=v1,i1,v2,i2]

**HSpice:**

tidn1n2n3n4[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:tidn1n2n3n4Z=zvalF=fvalE=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.

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