GUARDED_INPUT_PICOAMMETER_CIRCUIT

Published:2009/7/1 4:26:00 Author:May | From:SeekIC

The circuit utilizes CA3160 and CA3140 BiMOS op amps to provide a full-scale meter deflection of ±3 pA. The CA3140 serves as an X100 gain stage to provide the required plus and minus output swing for the meter and feedback network. Terminals 2 and 4 of the CA3160 are at ground potential, thus its input is operated in the guarded mode.



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