Describing sensors from datasheet information

AI Thread Summary
The discussion centers on interpreting a voltage gain versus frequency graph from a datasheet for an instrumentation amplifier. The closed-loop gain can exhibit peaking at higher frequencies due to internal capacitive elements that create positive feedback, which is not evident at lower frequencies. The open-loop gain shows steeper slopes as peaking frequencies are approached, while the closed-loop gain may represent actual data. Participants emphasize the importance of understanding the graph's multiple traces and encourage the original poster to clarify their schoolwork question. The conversation highlights the need for a deeper comprehension of the datasheet's content and its implications for describing sensor behavior.
melanie707
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There is a graph of voltage gain against frequency...but it seems like for a gain of 1, that the gain increases after a certain voltage... I know that that doesn't make sense and there is something I don't understand. I have attached a doc with the image from the datasheet in it.
How do I describe?!

Thanks!
Melanie
 

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The top trace is the open-loop gain and the bottom trace is the closed-loop gain with unity negative feedback.

The closed-loop gain can peak at some higher frequencies due to capacitive elements within the device producing some positive feedback. They don't show up at low frequencies because the capacitances look like open circuits at those lower frequencies.

The open-loop feedback should exhibit steeper slopes as the peaking frequencies are approached. The open loop is of course not data but just a Bode plot whereas the closed loop might be actual data. Only you know for sure ...
 
Hi rude man
thank you very much!

Iv'e attached a datasheet http://www.ti.com/lit/ds/symlink/ina111.pdf ... since there are more than one lines on the graph, what does this mean the graph is showing?
 
melanie707 said:
There is a graph of voltage gain against frequency...but it seems like for a gain of 1, that the gain increases after a certain voltage... I know that that doesn't make sense and there is something I don't understand. I have attached a doc with the image from the datasheet in it.
How do I describe?!

Thanks!
Melanie

melanie707 said:
Hi rude man
thank you very much!

Iv'e attached a datasheet http://www.ti.com/lit/ds/symlink/ina111.pdf ... since there are more than one lines on the graph, what does this mean the graph is showing?

Welcome to the PF.

Since this is your schoolwork, you are required to show some effort in answering the questions. What do *you* think is meant by the different traces on the graphs? What specifically is the schoolwork question asking for?

And the datasheet is for an Instrumentation Amplifier, not a sensor. Can you clarify?
 

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