Comments on: How to Derive the Summing Amplifier Transfer Function https://masteringelectronicsdesign.com/how-to-derive-the-summing-amplifier-transfer-function/ Electronics Design and Modeling with Emphasis on Analog Design Thu, 05 Oct 2017 23:42:25 +0000 hourly 1 By: Kurtis https://masteringelectronicsdesign.com/how-to-derive-the-summing-amplifier-transfer-function/#comment-41482 Thu, 05 Oct 2017 23:42:25 +0000 http://masteringelectronicsdesign.com/?p=413#comment-41482 Thank you! As an ME student having to take a circuits class, this has made things make much more sense.

]]> By: Op-amp Summing Amplifier | PCS https://masteringelectronicsdesign.com/how-to-derive-the-summing-amplifier-transfer-function/#comment-27163 Fri, 28 Aug 2015 08:33:14 +0000 http://masteringelectronicsdesign.com/?p=413#comment-27163 […] Op-amp Summing Amplifier on Electronics-tutorials Op-amp non Inverting Summing Amplifier on Masteringelectronicsdesign […]

]]> By: Adrian S. Nastase https://masteringelectronicsdesign.com/how-to-derive-the-summing-amplifier-transfer-function/#comment-2766 Sun, 28 Nov 2010 05:45:01 +0000 http://masteringelectronicsdesign.com/?p=413#comment-2766 In reply to Godwin.

Thank you for your comment Godwin. I am glad that this website helped you.

]]> By: Godwin https://masteringelectronicsdesign.com/how-to-derive-the-summing-amplifier-transfer-function/#comment-2183 Fri, 19 Nov 2010 06:39:57 +0000 http://masteringelectronicsdesign.com/?p=413#comment-2183 I am glad I fond this site!. Very easy to understand. All of the books only show inverting summing amplifiers but I need to design a non-inverting one. I thought it was complicated before. But when I saw your transfer function, I immediately realized that you used the Superposition Theorem to get the solution. Thanks a lot!

]]> By: Adrian S. Nastase https://masteringelectronicsdesign.com/how-to-derive-the-summing-amplifier-transfer-function/#comment-1087 Sat, 03 Jul 2010 07:35:36 +0000 http://masteringelectronicsdesign.com/?p=413#comment-1087 In reply to Kibblekly.

I believe you ask about sending personal messages to the other users of this website. For this you need a forum. I do not have a forum yet. I plan to have one in the future. If any of you would like to be forum administrator(s) please let me know. In the mean time you can post responses to other people’s comments.

]]> By: Kibblekly https://masteringelectronicsdesign.com/how-to-derive-the-summing-amplifier-transfer-function/#comment-1086 Fri, 02 Jul 2010 16:13:46 +0000 http://masteringelectronicsdesign.com/?p=413#comment-1086 How I can write PM to other users? Thanx

]]> By: Adrian S. Nastase https://masteringelectronicsdesign.com/how-to-derive-the-summing-amplifier-transfer-function/#comment-920 Mon, 10 May 2010 20:26:05 +0000 http://masteringelectronicsdesign.com/?p=413#comment-920 Thanks Aries. Glad you find this website useful.

]]> By: Aries https://masteringelectronicsdesign.com/how-to-derive-the-summing-amplifier-transfer-function/#comment-891 Thu, 06 May 2010 16:15:30 +0000 http://masteringelectronicsdesign.com/?p=413#comment-891 Very helpful source and it help me a lot especially when some of my lecture notes did not really help me a lot in understanding fully of some particular topic related. Thank you very much for the blog. Credit for you.

Thanks.

]]> By: Adrian S. Nastase https://masteringelectronicsdesign.com/how-to-derive-the-summing-amplifier-transfer-function/#comment-777 Wed, 07 Apr 2010 20:45:19 +0000 http://masteringelectronicsdesign.com/?p=413#comment-777 In reply to david.

Thank you David.  I really appreciate that.
As for your question, if you connect R3 to a reference voltage, say V3, the circuit output is shifted by   –V3*R4/R3.  The new transfer function is:

Vout = ((V1*R2/(R1+R2) + V2*R1/(R1+R2)) * (1+R4/R3) – V3*R4/R3

Hope this helps for now.  I will write a short article to prove this.  If you wish, please use the RSS or Facebook subscription to be notified.
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Update: I published this article. You can find it here:
A Summing and Differential Amplifier with One Op Amp

]]> By: david https://masteringelectronicsdesign.com/how-to-derive-the-summing-amplifier-transfer-function/#comment-775 Wed, 07 Apr 2010 15:33:23 +0000 http://masteringelectronicsdesign.com/?p=413#comment-775 Mr. Nastase, this is a great site full of practical and useful information. Thank you for putting this up! I do have a question that I am sure you can answer. How does the transfer function of Figure 1 change if R3 is tied to a reference voltage instead of zero potential? Thank you!

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