I would like to modify the CN0179 , the link below,
Vsys = 80V
Iout = 4mA ~ 20mA
application : APD testing circuit for optical field
Will update the MOSFET to VDS around 100v , Id=1A
However, After checked the circuit note. I don't sure the A2 AD8657 operation with a Zener diode 18V? if I change Vsys to 80V
anything else I need to change?
please advise, Thanks