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Practical Tips for Measuring Ultralow Bias Current Using Commercial-Grade Lab Equipment
Question: Is there an easy way to measure ultralow bias currents in the femtoampere area? Answer: Yes – it just requires a careful setup.
In applications where low leakage current is required, it is important to select a low input bias current (I B ) operational amplifier. The application note, AN-1373 describes how to measure ultralow bias current using the ADA4530-1 evaluation board. However, due to the nature of handling femtoampere (fA) level currents, the measurement environment – equipment such as jigs, shield, cable, and connectors – also affect the measurement results.
By Aoi Ueda, Field Applications Engineer, Analog Devices
24 ELECTRONICSPECIFIER.COM
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