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Old 13th January 2004, 01:40 AM   #1
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Default Low Temp Drift VRef (Zener?)

I need a voltage reference for my output stage bias circuit. I could use a zener diode, but the voltage drift with temperature is very bad. In addition, zeners are noisy.

Any comments on a VRef that is not senstive to temperature?
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Old 13th January 2004, 11:20 AM   #2
Steven is offline Steven  Netherlands
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Zeners or not that noisy. You can use them for biasing of output stages. The temp coeff. of low voltage zeners is negative, of high voltage zeners positive, and around 5.6V it is almost zero.

For very low temp coeff. use a regulator based on a bandgap instead of a zener.

Steven
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Old 13th January 2004, 11:45 AM   #3
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The LTZ1000 is pretty good.

http://www.linear.com/pdf/1000afas.pdf


JF
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Old 13th January 2004, 02:32 PM   #4
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I remember Elektor publishing a (theoretically) T independent discrete Vref (2 or 3 BJTs) Will try to dig it out...

In the meantime, have a look at National's LM199 (1ppm/C, with builtin heater and temp stabilizer) and at companion app notes too :

http://www.national.com/ds/LM/LM199.pdf
http://www.national.com/an/AN/AN-161.pdf
http://www.national.com/an/AN/AN-184.pdf

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