Output DAC simulation using AC simulation and balun S-parameter

[DiotMan]

Hello,

For a DAC output differential architecture, I want to evaluate the correct balun that better fits the DAC output impedance over frequency range [1; 100]MHz.

The DAC outputs drive 20mA ; it needs external 50ohm resistors to ground to provide +/-500mV DC offsets and the output swing is about 1V (into a 100ohm resistor).

However, when placing a balun (ratio 2:1) instead of the resistor, I’d like to know if the balun is correct, using either AC simulation or transient one. I use the balun S-parameter but I can see from the beginning that the DC simulation does not work with it (all is “zero”).

=> Is it possible to mix S-parameters in either AC or else transient simulations ?

Thanks in advance,

Attachments:

1. 

   DAC_SimuDynamique.pdf
   

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