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  • Input Resistance and Sensitivity...

    ddspliting

    Member

    Updated: Oct 26, 2024
    Views: 938
    While studying JFET I came across the statement...

    "A device/circuit with input resistance much high is usually very sensitive"

    its a general statement though but i don't understand well.
    Can any one tell me any reason for that? ........
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Replies

  • reachrkata

    Member • Aug 28, 2008

    I think what it indicates that even small currents flowing into the device can lead to considerable voltages at the inputs.

    -Karthik
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  • just2rock

    Member • Sep 1, 2008

    V=KIR...that means voltahge will take control on current flow depending upon resistance...not vice versa 😕
    reachrkata
    I think what it indicates that even small currents flowing into the device can lead to considerable voltages at the inputs.

    -Karthik
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  • reachrkata

    Member • Sep 3, 2008

    just2rock
    V=KIR...that means voltahge will take control on current flow depending upon resistance...not vice versa 😕
    Hmm. Let me explain it this way then.
    Say you have a voltage source connected via a series resistance to this device. It is clear that the device's resistance and the series resistance form a potential divider. Now higher the device's resistance more is the voltage across it. In addition, if the device is voltage sensitive, it could get triggered due to this voltage.

    Hope this clarifies !!
    - Karthik
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