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Ideal Transformer with Center Tap (with Finite Inductance and Leakage): XFMRTAP3



XFMRTAP3 models a transformer with a tap at the secondary winding. XFMRTAP3 differs from XFMRTAP in accounting for inductance of the primary winding and magnetic flux leakage.


Name Description Unit Type Default
ID ID Text X1
N1 Turns ratio Secondary winding 1 : Primary   1
N2 Turns ratio Secondary winding 2 : Primary   1
Lp Inductance of primary winding (open-circuit) Inductance 300 nH
k Coupling coefficient   0.9

Implementation Details

XFMRTAP3 implements an ideal transformer with a primary coil between nodes 1 and 2 and two secondary coils between nodes 3 and 4 and between nodes 4 and 5. The ratio of secondary to primary turns is given by N1 and N2. This model implies that windings have finite inductances and all winding are magnetically coupled with a coupling coefficient between each pair of windings equal to the value of parameter k.

DC is also transformed with this element. If you do not want to transform DC, you need to add capacitors on either side of the model to block DC.


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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