lattice balun with smith chart

hello guys,

i have spent some time trying to figure out how lattice baluns works, i could notice that we need equal values for caps and inductors for 180 phase goal, the problem is that when you match a leg, let′s say the "low pass leg" the "high pass leg" will not be matched with just exchanging cap and inductor position...

i used http://www.ti.com/lit/an/swra236a/swra236a.pdf this cc2500 circuit as a study case.

At the datasheet they say the balanced side has a 80+j74 Ohms impedance so what i did, was to take the half, 40+j34 ,and tried to play with, but had no sucess with the second leg..

any tips?


Ps: i tried to match 40+j37 with 20 Ohms as they do at the swra236a.pdf

thank you!