Much of what's offered in this software is very promising. However, for RF design people, band-pass filters and the like are key to our tasks. Simply doing the math or using some other tool to build a pi filter or a custom LC filter - requires some way to test the concept.

If there were a set of RF tools that specifically took aim at this, I'm certain this software would become quite valuable in our industry. For whatever reason, it's very hard to acquire software that allows both RF filter design AND analysis. Either you have a tool that permits you to enter parameters that produces a circuit you can build, or you have a CAD designed antenna that it will analyze. What's needed is a spectrum analyzer (VNA) that sweeps a given frequency range and plots out the curves in a meaningful way. Currently I use iCircuit to build a filter — only to see the scope change signal magnitude when I reach the resonant frequency. The pause button doesn't stop immediately (Mac 1.9.101) and for some reason the simulation bogs down after a full cycle (the wave in the scope becomes thick and slows to a crawl as though it's drawing the same line over and over on top).

Give me a VNA that will plot a graph when the linear sweep feeds a circuit, and let me choose a single vector line weight for the scope... the thick line does nothing for me. Also, the math model needs to either support multithread or something... as the higher frequencies start to show jagged wave forms.