<div dir="ltr">Someone shared this a while ago. It might help with the selection process.<div><br></div><div>Op Amp Shootout<br></div><div><a href="https://docs.google.com/spreadsheets/d/1cfqitAdr0XEY4nd1PxWJ7wSBVZPki5V--rAdHqpQrGc/edit#gid=1880344491">https://docs.google.com/spreadsheets/d/1cfqitAdr0XEY4nd1PxWJ7wSBVZPki5V--rAdHqpQrGc/edit#gid=1880344491</a></div><div><br></div><div><br clear="all"><div><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><font face="verdana, sans-serif" color="#444444"><b>Jacob Watters</b></font><div><font face="verdana, sans-serif" color="#444444"><a href="http://jacobwatters.com/" target="_blank">JacobWatters.com</a></font></div><div><span style="color:rgb(68,68,68)">Tel: 226-886-3526</span></div></div></div></div></div></div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Mar 2, 2020 at 9:47 AM Schwarz Raphael <<a href="mailto:raphschwarz@gmail.com">raphschwarz@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><br>
<br>
> Le 2 mars 2020 à 15:45, Schwarz Raphael <<a href="mailto:raphschwarz@gmail.com" target="_blank">raphschwarz@gmail.com</a>> a écrit :<br>
> <br>
>>> I read it so, that you're actually interested in clamping the input voltage. Why not bias the diodes to +5.8 and -5.8v instead?<br>
>> <br>
>> It is more like +-4.2 actually. :)<br>
> <br>
> <br>
> It’s actually a good idea<br>
> <br>
> I realized I overlooked the variation with forward current and temperature, <br>
> <br>
> I was a taking for granted the 0,8v drop , at 25° and 10mA it’s actually much less<br>
> <br>
> About 0.24v on a bat54s (what I was using)<br>
> About 0,65v on a 4148. <br>
> <br>
> Real life testing of a bunch of diode is consistent with this. My simulator has a very simplified model of diodes<br>
> <br>
> I wonder if biasing to about 4.75v is a practical solution with part tolerance , out of a bunch of bat54s I randomly tested it seems to only vary by a few mV<br>
> <br>
> temperature variation is not crazy for 10ma datasheet says 0,3v at 0° and 0.2v at 75°. So about 1% of 5V from 0° to 75°<br>
> <br>
> So it might be doable<br>
> <br>
> I still think a good rail to rail opamp would be a more elegant solution<br>
> <br>
> 1% of 5v is 50mV : something that could fit that range or slightly better would be enough. The application is keeping a bunch of gain to a maximum.<br>
> <br>
> Best,<br>
> Raphael<br>
<br>
<br>
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</blockquote></div>