So I've been designing a Joerg-esque super cheap single diode sampler. With vaguely realistic parasitics, LTspice says it should give a sampling FWHM of 120 ps or a bit faster, all for well under a buck excluding the timing generation part, but including the pulse speedup part.
In the spirit of keeping things cheap and small, I'm using a single JFET switch and a hold capacitor to store the sampled voltage until the ADC gets round to coverting it.
Since it's all on a single 5-V supply, I need a small JFET with super low pinchoff voltage. The best one I can get for cheap seems to be the2SK3796-3, which is about 9 cents in reels from distributors.
Unfortunately, there's no SPICE model that I can find.
So since I'm not going to buy PSPICE just for this one part, what else do you folks use for model creation?