Title :
Ultra low noise, current to voltage converter with offset compensation independent of the source impedance
Author :
Ciofi, C. ; Festa, G. ; Giannetti, R. ; Neri, B.
Author_Institution :
Dipt. di Ingegneria dell´´Inf., Elettronica, Inf., Telecommun., Pisa Univ., Italy
Abstract :
A new version of a low-noise, high gain transimpedance amplifier, operating in the frequency range from DC to KHz, is described. The new version of the instrument, thanks to a completely differential architecture, is capable to give the same stability without controlling the temperature of the input stage, as in the previous one. A more sophisticated circuitry for offset nulling allows to null contemporaneously both voltage and current input offset sources. A further improvement of the performance, as far as low frequency noise is concerned, has been obtained. In fact, for instance, the input equivalent current noise is 5.2 fA/√Hz between 10 mHz and 2 Hz
Keywords :
convertors; differential amplifiers; electric current measurement; error compensation; operational amplifiers; 10 mHz to 2 Hz; DC to kHz; current to voltage converter; differential architecture; frequency range; high gain transimpedance amplifier; input equivalent current noise; input stage; low frequency noise; offset compensation; offset nulling; source impedance; stability; Current measurement; Differential amplifiers; Frequency; Impedance; Instruments; Low-frequency noise; Low-noise amplifiers; Telecommunications; Temperature control; Voltage;
Conference_Titel :
Instrumentation and Measurement Technology Conference, 1998. IMTC/98. Conference Proceedings. IEEE
Conference_Location :
St. Paul, MN
Print_ISBN :
0-7803-4797-8
DOI :
10.1109/IMTC.1998.676826
