500_MΩ_INPUT_IMPEDANCE_WITH_JFET_AMP

Published:2009/6/15 3:47:00 Author:May | From:SeekIC

A current source using a 2N3904 transistor plus bootstrapping, achieves an input impedance of 500MΩ. A second 2N3904 transistor can be added at X to lower the output impedance.



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