Small current amplifier circuit

To amplify the small current signals as an electron collector inside a vacuum chamber, it is convenient for reasons of noise and bandwidth to have a `head-amplifier` attached to the chamber. Op N-amp 1 is a precision device with bipolar bias current and low offset voltage (1)-and the noise low, which allows the 100:1 attenuator comments to be used..

Small current amplifier circuit - img1

The resistor R3 can vary by more than 10 million to less than 1 k, and so the nominal value from 0 to 1 V output signal peak corresponds to the input current ranges from 1 nA to 10 pA.

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