Title :
Time Variant Preamplification for Low Current Measurements
Author :
Maranesi, P. ; Varoli, V.
Author_Institution :
Institute of Nuclear Engineering, Politecnico di Milano via Ponzio 34/3, 20133 Milano, Italy
Abstract :
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.
Keywords :
Bandwidth; Bridge circuits; Circuit noise; Current measurement; Filters; Phase measurement; Preamplifiers; Signal analysis; Time measurement; Voltage;
Journal_Title :
Nuclear Science, IEEE Transactions on
DOI :
10.1109/TNS.1984.4333437
