Guarded input picoammeter circuit

  
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 - schematic

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




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