Re: Converting a NTC voltage into temperature in Celcius

Bill Sloman wrote:

Don wrote:

brian wrote:
>
<snip>
>

I ended up using a diode as a temperature sensor as I
couldn't get it linear enough.

>
Interesting. Thank you for sharing. When operated in Zener mode (as
opposed to avalanche mode) a Zener diode's NTC apparently remains
approximately the same, regardless of orientation (forward or reverse
biased).

>
Whether a reverse biased diode breaks down in Zener mode or avalanche
mode depends entirely on the diode you have selected.
>
if it breaks down at less than 5V reverse voltage it is breaking down by
the Zener mechanism (with a negative temperature coefficient) , and if
it the breaks down at an 8V or a higher reverse voltage the avalanche
mechanism is dominant (with a positive temperature coefficient.
>
https://toshiba.semicon-storage.com/us/semiconductor/knowledge/faq/diode/are-there-any-special-considerations-for-the-temperature-coeffic.html
>
doesn't exactly conform to your claim.

My statement

    When operated in Zener mode (as opposed to avalanche mode)

pertains Zener diodes in Zener mode. Why do you want to talk about the
positive temperature coefficient of Zeners in avalanche mode?

Danke,

--
Don, KB7RPU, https://www.qsl.net/kb7rpu
There was a young lady named Bright Whose speed was far faster than light;
She set out one day In a relative way And returned on the previous night.