Schematics > Test and measurement > Picoammeter circuit with 4 ranges
Picoammeter circuit with 4 ranges
This circuit uses a CA3420 BiMOS op amp to form a picoammeter with 4 ranges.
The exceptionally low input current (typically 0.2pA) makes the CA3420 highly
suited for use in a picoammeter circuit. Input transient protection is provided
by the 1 megohm resistor in series with the input. The 10 megohm resistor
connected to pin 2 decouples the potentially high input capacitance often
associated with lower current circuits and reduces the tendency for the circuit
to oscillate under these conditions. The 10k potentiometer is used for null
offset.
Title: Picoammeter circuit with 4 ranges
Source: Harris Semiconductor
Published on: 2005-02-10
Reads: 275
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