Guys,
I've tracked down a second problem: the gain of the current controlled current sources should be negated. Here is the updated netlist:
Code:* BALUN
*
* A bidirectional balanced-unbalanced converter.
* Maps between the unbalanced signals ‘d=1’ and ‘c=2’ and the balanced signals ‘p=3’ and ‘n=4’.
.subckt balun (1 2 3 4)
* Ideal transformer for the positive input
E1 5 2 1 0 0.5
V1 3 5
F1 1 0 V1 –0.5
R1 1 0 1T
* Ideal transformer for the negative input
E2 6 4 1 0 0.5
V2 2 7
F2 1 0 V2 –0.5
R2 7 6 1u
.ends balun
I have updated the paper on the site. Thanks for pointing out these problems.
-Ken