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Time Variant Preamplification for Low Current Measurements

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2 Author(s)
Maranesi, P. ; Institute of Nuclear Engineering, Politecnico di Milano via Ponzio 34/3, 20133 Milano, Italy ; Varoli, V.

An ion chamber current meter spanning seven decades from 10 fA to .1 ¿A is described. It is based upon a current-to-width conversion technique implemented by a gated-integrator preamplifier. Performing automatic offset and bias current adjustments, it achieves a particularly long-term service-free operation. A complete analysis of its noise is made; signal-to--noise optimization is attained by means of a self--adapting filter.

Published in:

Nuclear Science, IEEE Transactions on  (Volume:31 ,  Issue: 5 )

Date of Publication:

Oct. 1984

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