Home Forums Usage Output DAC simulation using AC simulation and balun S-parameter

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    DiotMan
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    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,

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