I once used a Maxim part rated DC to 10 GHz, that absolutely screwed up below 100 MHz.
A lot of "DC" parts are actually characterized down to 9 KHz, because lots of spectrum analyzers only go that low.
Grrrrr.
O yes, they are different. No one would really understand, until you work with one.
Cheers
I found one Pericom RF switch that is "True DC to 8 GHz", which may be an improvement.
So DC means AC, but "True DC" means DC in the RF world.
ISTR being told here that 40Mhz was "practically DC" (but I suppose today it probably is!)
I thought it might be 100MHz. After all, the wavelength is almost 10 feet long!
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