Describing sensors from datasheet information

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Discussion Overview

The discussion revolves around interpreting a datasheet for an instrumentation amplifier, specifically focusing on a graph that depicts voltage gain against frequency. Participants are exploring how to describe the characteristics of the graph and what the multiple traces represent.

Discussion Character

  • Technical explanation
  • Conceptual clarification
  • Homework-related

Main Points Raised

  • One participant notes confusion regarding the behavior of gain at certain voltages and seeks guidance on how to describe the graph.
  • Another participant explains that the top trace represents open-loop gain and the bottom trace closed-loop gain with unity negative feedback, suggesting that the closed-loop gain can peak at higher frequencies due to capacitive elements causing positive feedback.
  • A participant questions the meaning of multiple lines on the graph and seeks clarification on what the graph is showing.
  • There is a reminder that the datasheet pertains to an instrumentation amplifier, not a sensor, prompting a request for clarification on the schoolwork question.

Areas of Agreement / Disagreement

Participants express varying levels of understanding regarding the graph and its implications, with no consensus on the interpretation of the multiple traces or the specifics of the schoolwork question.

Contextual Notes

Participants have not fully resolved the assumptions regarding the graph's representation and the implications of the different traces. There is also a lack of clarity on the specific schoolwork question being addressed.

Who May Find This Useful

Students or individuals interested in understanding datasheet information for electronic components, particularly in the context of instrumentation amplifiers and their gain characteristics.

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
 

Attachments

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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 ...
 
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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