App note: High voltage, low noise, DC/DC converters

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An app note from Linear Technology: High voltage, low noise, DC/DC converters (PDF!)

Photomultipliers (PMT), avalanche photodiodes (APD), ultrasonic transducers, capacitance microphones, radiation detectors and similar devices require high voltage, low current bias.  Additionally, the high voltage must be
pristinely free of noise; well under a millivolt is a common
requirement with a few hundred microvolts sometimes
necessary. Normally, switching regulator confi gurations
cannot achieve this performance level without employing
special techniques. One aid to achieving low noise is that
load currents rarely exceed 5mA. This freedom permits
output fi ltering methods that are usually impractical

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