Guarded input picoammeter circuit


Posted on Mar 13, 2013

The circuit utilizes CA3160 and CA3140 BiMOS op amps to provide a full-scale meter deflection of ± 3 pA. The CA3140 serves as an 1T0 gain stage to provide the required plus and minus output swing for the meter and feedback network.


Guarded input picoammeter circuit
Click here to download the full size of the above Circuit.

Terminals 2 and 4 of the CA3160 are at ground potential, thus its input is operated in the ' 'guarded mode.''




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