No, but if I needed a HV CS I would search for a device that fills the specs and that would give me the voltage compliance and dynamic impedance I want. I definitely would not blindly select one of those current sources that are presented on a datasheet as if they are a device, and which I think has only as purpose to increase sales of that particular FET.
Jan
Walter, why not take the feedback from the output? That would make it a real good regulator, right now most of the LR8 performance is wasted because of the FET follower.
Jan
Thanks for pointing this out Marcel. It's a simple, one port measurement, and yes I believe that energy is being reflected back into the VNA - interesting this is pointed out as a source of measurement error in a Keysight application note.
I have a "dynamic load" -- ZTX450/ZTX550 which is good to a few MHz. Will see.
Might just be better to break the loop and measure PM at 0dB, but impedance is so much easier.
Note that in subsequent correspondence, it was pointed out that the LM317 is a noisy CCS.
Hi Jan
honestly the test done on desk are fine. The level of ripple is very low and stability with different current is also fine
But I will check your suggestion, it is easy to do
Walter
