Hi, you can do this dimensioning in the free version, FilterFree, of NuHertz software. You do not need to use the trial version of the purchase version.

http://www.nuhertz.com/register/reg_free.html

I agree with rficdude, it can be hard to get a good filter with a low-Q integrated inductor. Usually the knee at the filter edge will not be as sharp as the ideal filter response, but you maybe can survive anyway.

I just pressed the link above and downloaded the new version 13.1.0 of FilterFree without any waiting for keys and passwords. You are probably on the wrong webpage trying to download the trial version of the purchase version of the software

Hi Kelly,

Is it possible that at 500MHz you may be better off with a RC filter or to figure out a way to use the VGA as part of the feedback loop for an active RC filter.  The reason I ask is that as stated by RFICDUDE the inductor will not be economical and you may want to look for alternatives.  I am not sure what your area or current budget is or even the process you are using, but if you are using an expensive less than 90nM process then do something else because the inductor will be expensive.  Also I f you want a free program to play around or even simulate a filter go to my site at http://rfcooltools.com and select the filter design button or you could try a free product AADE filter design, or another free product Elsie which can generate a prototype that you desire.  but remember the Q will be small around 2 to 4 at 500MHz and this will be your biggest issue in implementation.

http://rfcooltools.com