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What does the symbol imply?

Discussion in 'General Electronics Discussion' started by Chengjun Li, Oct 21, 2014.

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  1. Chengjun Li

    Chengjun Li

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    Oct 21, 2014
    Could anyone tell me what does the symbol below and the term represent for?
    upload_2014-10-21_10-25-58.png
     
  2. KrisBlueNZ

    KrisBlueNZ Sadly passed away in 2015

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    A circle with an X inside it usually represents an incandescent light bulb. But without more context, i.e. the rest of the circuit, I couldn't be sure that that's what it's supposed to represent in that circuit.
     
  3. Chengjun Li

    Chengjun Li

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    7
    Oct 21, 2014
    Sorry, I should provide the whole circuit.
    upload_2014-10-21_10-30-1.png
     
  4. KrisBlueNZ

    KrisBlueNZ Sadly passed away in 2015

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    It might represent an electronically controlled switch, perhaps. Can you give the full URL of the article the circuit come from?
     
  5. Chengjun Li

    Chengjun Li

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    Oct 21, 2014
    Actually this is the from the datasheet of MS3110, a sensor used to measure tiny capacitance change.
     

    Attached Files:

  6. KrisBlueNZ

    KrisBlueNZ Sadly passed away in 2015

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    Have a look at the diagram on page 5. It looks like that symbol represents an electronically controlled changeover switch that connects its left side to one or other of the two rails named on the right.

    MS3110 page 5.png
     
  7. Chengjun Li

    Chengjun Li

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    Oct 21, 2014
    Yeah, it seems you are right. Then does this part upload_2014-10-21_10-52-6.png in the circuit provides a square wave between 2.25V and 0V? And upload_2014-10-21_10-53-12.png this part provides a out of phase square wave also between 2.25V and 0V?
     
  8. KrisBlueNZ

    KrisBlueNZ Sadly passed away in 2015

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    I guess so. I haven't read the data sheet enough to know what signal is controlling all of the switches, but I assume that the triangle shows the position of the switch in a specific case - either the low phase of the control signal, or the high phase. So during one phase of the control signal, all the switches would be connected to the side marked with a triangle, and during the other phase of the control signal, all the switches would be connected to the side opposite the triangle.
     
  9. Chengjun Li

    Chengjun Li

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    7
    Oct 21, 2014
    Thanks a lot!
     
    KrisBlueNZ likes this.
  10. Chengjun Li

    Chengjun Li

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    Oct 21, 2014
    Hi, I am working on the transfer function of MS3110, I want to know how the transfer function is derived. I have post another thread on this https://www.electronicspoint.com/threads/ms3110-high-resolution-capacitive-readout-circuit.270929/ , would you please give me some instruction if you have any idea? Thanks.
     
  11. KrisBlueNZ

    KrisBlueNZ Sadly passed away in 2015

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    I've seen the other thread and I don't have anything to add.
     
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