| Electronics > Projects, Designs, and Technical Stuff |
| Ultra low power, clean 30V power supply + ultra low power high speed comparator? |
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| Someone:
--- Quote from: Kleinstein on June 29, 2019, 08:22:42 am ---I don't think the ripple would be such a big problem - it just needs a relatively large capacitor for filtering. At 30 V it could be tricky to find a suitable low power and low noise linear regulator though - though there could be a few. I would be more worried about low frequency noise than higher frequency ripple. --- End quote --- There are many linear regulators hitting these specifications, but things like capacitor leakage and board contamination start to become an issue down at these low currents. Its not difficult to reach the OPs requirements for power. The glaring problem is thermal sensitivity as noted already: --- Quote from: David Hess on June 29, 2019, 07:51:39 am ---20 millivolts out of 30 volts is 667ppm so accuracy over temperature is going to be a problem. --- End quote --- And that is before considering the thermal characteristics of the SiPM its self, though the discrimination technique planned by the OP makes it less sensitive than it could have been. For reference Hamamatsu include temperature compensation on their MPPC (SiPM) supplies. |
| Marco:
20 mV shift of the cathode voltage is going to do very little to the gain of the SiPM, hardly a problem. 20 mV ripple is more annoying. |
| IconicPCB:
lm723? |
| Wolfgang:
--- Quote from: IconicPCB on June 30, 2019, 08:07:16 am ---lm723? --- End quote --- Yes, absolutely. But with a PNP pass transistor, and a Wenzel cleanup shunt. If you need to be absolutely sure, make a preregulator, too. |
| Marco:
Not exactly ultra low power. |
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