I did face an issue with an professional but old function generator.
At at higher frequencies the named voltage output ( Peak to Peak) above the 300KHz it starts to drop significantly,
more specifically the generator have as specs 20VPP 0-20MHz, and at 300KHz the voltage drops to 5VPP.
And above 300KHz it drops even more, to the point the output to become few mV.
Is this normal or expected ?
In theory I would expect 20VPP in all the range of frequencies !!
Is out there the perfect Function generator, that has identical output in full range ?
My small own small and cheap frequency generator 27KHz max, acts the same, but so far I was thinking that it was due the simplified design.