sheldon
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Raj,
Since you don't mention whether you are working on a linear regulator or a switching regulator, let's assume that you are interested in an LDO. In that case, just use your standard testbench and do a dc sweep of the input voltage and and look for the voltage when the regulator goes out of regulation. At some point the output voltage will change as the input voltage changes, that is, voltage where the regulator goes out of regulation. The difference between the input voltage and the out voltage as the regulator goes out of regulation is the Droput Voltage.
Best Regards,
Sheldon
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