<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto">This dude is obviously just phishing for free copyrighted material.<div> Don’t even give him the one of day based on the jackass response he just gave.</div><div> People suuuuuck!<br><br><div id="AppleMailSignature"><div>Edward Schultheis</div><div><br></div>Sent from me!</div><div><br>On Jun 14, 2018, at 7:06 PM, Andrew Simper <<a href="mailto:andy@cytomic.com">andy@cytomic.com</a>> wrote:<br><br></div><blockquote type="cite"><div><div dir="ltr">Hi Neil,<div><br></div><div>Thanks for pointing that out, I didn't take a loop at the part number and there was no regular symbol of the current arrow at the inputs like there is meant to be on the op-amp inputs to differential it from a regular op-amp as shown in figure 4 part (b) here: <a href="http://www.ti.com/lit/an/snoa653/snoa653.pdf">http://www.ti.com/lit/an/snoa653/snoa653.pdf</a> .</div><div><br></div><div>Can you please give me the theory of operation of an ideal "Norton op-amp"? Once I have those equations I can add this as a new device to my solver and re-generate the code. As an example the defining equations for an ideal op-amp are here:</div><div><br></div><div><a href="http://qucs.sourceforge.net/tech/node67.html">http://qucs.sourceforge.net/tech/node67.html</a></div><div><br></div><div>Thanks!</div><div><br></div><div>Andy</div></div><br><div class="gmail_quote"><div dir="ltr">On Fri, 15 Jun 2018 at 00:26, Neil Johnson <<a href="mailto:neil.johnson71@gmail.com">neil.johnson71@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi,<br>
<br>
Andy wrote:<br>
>> If anyone is interested in the linear case then here are the equations to solve the circuit:<br>
>> <a href="https://cytomic.com/files/dsp/comb-filter-resonator-equations.pdf" rel="noreferrer" target="_blank">https://cytomic.com/files/dsp/comb-filter-resonator-equations.pdf</a><br>
>><br>
>> and here is an implementation in python generator by my circuit solver:<br>
>> <a href="https://cytomic.com/files/dsp/comb-filter-resonator.py" rel="noreferrer" target="_blank">https://cytomic.com/files/dsp/comb-filter-resonator.py</a><br>
>><br>
>> and a plot of the filtering of a sawtooth given one set of component values:<br>
>> <a href="https://cytomic.com/files/dsp/comb-filter-resonator.png" rel="noreferrer" target="_blank">https://cytomic.com/files/dsp/comb-filter-resonator.png</a><br>
<br>
Brian wrote:<br>
> There’s one error in your reproduction of the schematic, though. rp is not supposed to be grounded, but should be connected to the +V supply. How much does that change the equations? It should reverse the current through the resistor, at the very least.<br>
<br>
And also note that the op-amp used is a Norton op-amp, so it draws<br>
current on its inputs. That will change the equations.<br>
<br>
Neil<br>
-- <br>
<a href="http://www.njohnson.co.uk" rel="noreferrer" target="_blank">http://www.njohnson.co.uk</a><br>
</blockquote></div>
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