Hi there - I need to make an adjustable DC power supply that takes an input of 5V and have an output of about 100-200V. I'm not sure on the exact voltage yet - ideally it'd be adjustable. I would like ripple to be as low as possible, ideally in the mv range. Admittedly I don't know exactly how low ripple needs to be, so I would like to err on the side of low ripple. Current will be very low, under a ma I believe. I think microamp or nanoamp range. This will be the power supply for an Avalanche Photo Diode (APD). I haven't chosen a specific one just yet.
Is there a standard/accepted way of doing something like this? I've seen some people create an AC signal, run it through a transformer that steps up the voltage, and then rectify/smooth that. Is that a good way, or are there better ways? Are there any parts I should be looking at, or application notes, or anything like that? Thanks!
-Michael