ADS DC voltage Regulator

Hi everyone ,
i want to add DC Voltage regulator (for example :78xx series ) to my circuit in ADS , but i do not know whether can i find the composant ready for use or I have to make a model for that ?
please can someone help me ,
thankyou all ,

There isn't any model for such circuits for neither ADS nor any.Its' characteristics are defined and you take it, use it.

how can i do that please ?

ADS is not essentially a ordinary SPICE like simulator, instead ADS is a RF/Communication Systems targeted/focused simulator therefore I don't suggest you to use ADS for such circuits.Regulators are simple and well defined circuits so you don't have to model them so that they supply voltage/current at a fixed value.Use a ideal voltage supply with a small resistance that will represent its internal resistance and you may also connect a noise generator to implement its noise voltage which will appear in practice between its terminals.That's it..
You don't have to use anything else to use it in your simulation setup.

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