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Balun, Balanced to Unbalanced Ferrite Sleeve (Closed Form): BALUN2

Symbol

Equivalent Circuit

Parameters

Name Description Unit Type Default
ID Element ID Text BU#
Zo Char. Imped of Txline Resistance 50 ohm
Len Physical length of Txline Length L[1]
Er Effective dielectric constant of Tx line   1
A Attenuation const of Txline (dB/m)   0
F Frequency for scaling of Txline attenuation Frequency 0 GHz
Mu Relative permeability of the ferrite sleeve   1
L Inductive index (inductive units/turns2) Inductance 1 nH

[1] User-modifiable default. Modify by editing under $DEFAULT_VALUES in the default.lpf file in the root installation directory.

Implementation Details

This component models an ideal balanced-to-unbalanced transformer that consists of a transmission line wound around a ferrite core. The external balanced line connects to ports 1 and 2; the external unbalanced line to port 3.

The choking inductance, Lc, is

The attenuation A(F) has the following frequency dependence:

where f is a simulation frequency.

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.

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