Thank you so much for sharing your thoughts.The first solution, may be more accurate and more precise
What do you mean by the series resistor? I guess you mean the DC output resistance of the buffer in negative feedback (which should be small due to the negative feedback). Am I right?For sure the series resistor needs to be small enough, so that the voltage_drop x average_current is also smaller than the expected error.
Thank you so much for your response.Higher BW :
1) More power needed.
2) More noise generated.
3) Greater EMI possible.
4) More difficult OpAmp compensation due to strays
and phase margin. Leads one to lower Z's = more power.
Tradeoffs, always tradeoffs. Sim to get some guidance.....
From what you say, I may understand that solution 2 is much better only if I have the required area for the Decaps (but no other drawback). All the reasons you give above point to avoiding the higher BW solution, right?
We miss the two schematics from your side ... so we had to guess.I did not understand why the first solution is more accurate.
I am afraid that I can't share the schematics because of the confidentiality of the company where I work in.Hi,
We miss the two schematics from your side ... so we had to guess.
Maybe I misinterprete your description, maybe not. I don´t know for sure.
There is a good reason why we use schematics instead of a textual circuit despription: It is rather clear information and we don´t need to guess.
If you need a deeper discussion: please post schematics.
Klaus
I did not ask you to design the circuits for me.Hi,
honestly ... what should be so "confidential"? It should be rather basic and is already done million times.
Don´t get me wrong, I have my job to do .. so I won´t do your job.
I will help, but you have to do the main job.
In case you expect others to do your job ... consdier to pay them.
Let´s compare it with this:
If you want to hike a mountain. I will be happy to help you to solve the difficult parts. But you have to go on your own, I won´t carry you up the mountain.
Klaus
Thank you so much for your clarification.Hi,
to show what I mean:
There is this thread where a member gives a textual description.
Then we ask for a sketch/schematic which (s)he provides.
And then we see that there is much of a difference between text and sketch.
It was a waste of time to discuss about the textual description.
The sketch way more showed the real application.
Now with your post, we miss a lot of details a schematic could show .. but it´s hard to describe with text.
(That´s why there are schematics. Imagine one should describe - and another person understand - a textual description of the circuit of a washing machine controller)
We all want to help. But helping should be focussed and not be a waste of time. This would be no good for nobody.
So if we have a better view of what your two "possible solutions" are .. we can give better assistance.
I don´t force you into anything. This is just a well meant recommendation. And only for your benefit.
You decide.
Klaus
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