Voltage follower with 1G ohm input resistance

Published:2012/10/29 21:54:00 Author:muriel | Keyword: Voltage follower, 1G ohm input resistance | From:SeekIC

This circuit uses an LM11 to form a voltage follower with 1G ohm input resistance built using standard resistor values. With the input disconnected, the input offset voltage is multiplied by the same factor as R2; but the added error is small because the offset voltage of the LM11 is so low. When the input is connected to a source less than 1G ohm, this error is reduced. For an ac-coupled input a second 10M resistor could be connected in series with the inverting input to virtually eliminate bias current error; bypassing it would give minimal noise.



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