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low current PIR

Discussion in 'Electronic Design' started by EVO8VIII, Feb 1, 2013.

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  1. EVO8VIII

    EVO8VIII Guest

    I am working on very low current (10uA) design using LHI 878. Perkin Elmer app not e recommends 47K load resistor on source pin, which make my currentgoal very difficult. I've come across few designs where people have used over 1M on source pin to achieve this amount current. Does any one know if is okay use over 1M value? what could be side affect?
     
  2. Can you post a link to the app note?
    Pyro's only respond to changes in light... so knowing very little of
    the details I might worry that the larger R would reduce the maximum
    frequency and thus the signal level.

    George H.
     
  3. mi

    mi Guest

    muRata IRA-E712 at least works perfect with a 2 uA. We're using both S and D resistors
    in the circuit with gate tied to ground. I don't remember the exact numbers, but I think
    our R is a lot less than 1M, as the current is controlled by the biasing.

    -- Mikko OH2HVJ
     
  4. EVO8VIII

    EVO8VIII Guest


    http://www.szbohan.com/UploadFile/2009_10_28_44167_95118.pdf
     
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