December 2012
Intermediate to advanced
1268 pages
44h 57m
English
Content preview from Analog Circuit Design Volume 2
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Chapter 7
High voltage, low noise, DC/DC converters
A kilovolt with 100 microvolts of noise
Jim Williams
Introduction
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 configurations 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 filtering methods that are usually impractical.
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