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Phase Spec: Floating Shield, Open (Closed Form): TLOC2

Symbol

Summary

TLOC2 simulates a two terminal ideal open-circuited transmission line with isolated (floating) ground terminal. The characteristics of the transmission line are specified as the characteristic impedance and the electrical length at a given frequency. Extreme care should be used with this element as it is meant to work in concert with additional elements which relate the voltages at ports of the transmission line to the global ground. Unusual and unexpected behavior can result if these additional elements are omitted.

Parameters

Name Description Unit Type Default
ID Name Text TL1
Z0 Transmission line impedance Resistance 50 ohm
EL Electrical length (phase length) at F0 Angle 90 Deg
F0 Frequency used to specify EL Frequency 10 GHz

Equivalent Circuit

See equivalent circuit of TLIN4.

Parameters

Name Description Unit Type Default
ID Name Text TL1
Z0 Transmission line impedance Resistance 50 ohm
EL Electrical length (phase length) at F0 Angle 90 Deg
F0 Frequency used to specify EL Frequency 10 GHz

Parameter Details

EL and F0. These parameters determine the frequency dependence of the electrical length of the line, described as βL=EL· freq/Fo · π/180 where freq is the evaluation frequency.

Implementation Details

See the TLIN4 "Implementation Details" section.

Layout

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.

Recommendations for Use

This model, along with additional components can be used to model transmission line baluns and transmission line transformers in which one of the conductors is shielded from ground, like in a coaxial line.

NOTE: Because the model definition does not include interactions with the ground, unusual and unexpected results can occur if other components are not used to relate the voltage on both sides of the transmission line to ground.

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