Silicon carbide rectifiers in cd clock ps

[john dozier]

Has anyone done this? I ask because I am about to use a Tentlabs setup and will modifiy their XO ps with a silicon carbide bridge and was wondering what improvements I may expect. Regards

[qusp]

none for this application, they often have higher dropout and are not what you would acll a 'soft' diode. no chance they will give lowr noise, which is the only thing important for a clock PSU

[Bigun]

don't the Cree SiC rectifiers have very low minority charge storage = clean recover ?

[qusp]

yeah they offer what they call 'zero recovery' i've used them quite a bit, they are actually nice diodes, but check out Nelson's measurements/comments on zero recovery/sic diodes (i'll see if I can find the link); they can cause a resonance.

the main disadvantage i've found from using them is quite a bit higher diode drop, so if replacing the diodes and diodes only in an existing design, you may find that it doesnt leave enough margin for the regulator. I found that they made what was a properly sized custom wound transformer less than ideal because of this factor.

for an amp of your own design, they may present some advantages, but for a clock regulator I dont see the point.