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Ultra-low-noise CMOS current preamplifier from DC to 1 MHz

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5 Author(s)
Ferrari, G. ; Dip. di Elettron. e Inf., Politec. di Milano, Milan, Italy ; Farina, M. ; Guagliardo, F. ; Carminati, M.
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An ultra-low-noise, DC-1 MHz, current preamplifier is presented featuring a matched double-MOS architecture around a low offset opamp to obtain bidirectional gain with a signal range from -40 to 30 nA. Current noise density reaches a value of 500 ??A/??Hz, equivalent to a 100 G?? resistor, giving a 1 pARMS noise in a 100 kHz band. The strictly equal operating point of all transistors ensures excellent linearity even at femtoAmpere input current.

Published in:

Electronics Letters  (Volume:45 ,  Issue: 25 )

Date of Publication:

December 3 2009

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