LOW_DRIFT_MICROPOWER

Published:2009/7/15 22:05:00 Author:Jessie | From:SeekIC

Uses JFET biased slightly below pinchoff in combination with micropower opamp to convert zero-temperature-coefficient drain current to correspondingly stable reference voltage. Additional JFET J2 makes operation independent of value of unregulated input. Output impedance is low. For higher output impedance, reference voltage can be taken from wiper of R2, but buffering could then be required. R1, is adjusted to compensate for temperature coefficient arising from opamp supply current.-N. Sevastopoulos and J. Mayer, Micropower Reference Stays Stable, EDN Magazine, Sept. 5, 1978, p 158.



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