Temperature Compensated Exp Conv.

[Tadej Bozicko]

Hi again!

About JFET temp. drifts: I used SPICE4 built in models (for BJT's and all
other parts) so I do not know for sure if spice simulates JFET's thermal
characteristics. As the default model for BJT has thermal dependency
implemented, I don't see a reason, why the JFET wouldn't have it. But I
could be wrong...

Tadej Bozicko

-----Izvorno sporoèilo-----
Od: Jim Patchell <patchell at teletrac.com>
Za: synth-diy at mailhost.bpa.nl <synth-diy at mailhost.bpa.nl>
Datum: 1. september 1999 20:13
Zadeva: Re: Temperature Compensated Exp Conv.


>    The one question I have is in your simulation, did you also simulate
>any thermal drift the the two J-FET's in the circuit might contribute?
>The idea you have is sound.  Thanks for posting this.  I wish I had the
>time to try it (must be some sort of epidemic disease going around
>eating up free time).
>
>    -Jim
>
>
>Tadej Bozicko wrote:
>
>>  Hi all! After a week of restles work in SPICE simulator, I've came up
>> with a new compensation circuit for CA3046 based expo converters. As
>> it shows simulator, the circuit totally cancel out the temperature
>> dependance of expo converter. Too good to be true? Oh, yes... the bad
>> thing: the circuit had not been built yet, as I am on short with my
>> spare time. Anyone willing to give it a shot, to see, how it behaves
>> in real life before I do?Oh, yes... the
>> circuit:http://www.uni-mb.si/~uelelt68b/synth/tcec.html Any comments,
>> critics, flames greatly recommended! P.S: Excuse my poor
>> english! Tadej BOZICKOMail: tadej.bozicko at uni-mb.siWWW:
>> http://www.uni-mb.si/~uelelt68b/synth
>