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Embedded and Microcontrollers
Embedded Forum Need cheap & small EMI shield for PCB
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Related

Need cheap & small EMI shield for PCB

Catwell
Catwell over 15 years ago
A certain area of one of my circuits, on a PCB, is very sensitive to surrounding noise, to the point when it begins to fail within a short amount of time. I want to shield this area. Is there an off the shelf shield, with different size options if possible? As far as mounting goes, I can do through hole, bolting, or adhesives.  And in the future, I would design around the ideal shield enclosure.
 
And suggestions?
 
Cabe
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  • enrico.migchels
    0 enrico.migchels over 15 years ago

    Hi Cabe,

     

    Did you investigate the circuit for unnecessary high impedance inputs? Noise susceptibility can most of the time easily be avoided by input filtering or choosing lower resistor values.

     

    Best regards,

     

    Enrico Migchels

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  • Catwell
    0 Catwell over 15 years ago in reply to enrico.migchels

    Enrico,

     

    The main issue is outside noise issues. It is a very delicate component.

     

    Cabe

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  • enrico.migchels
    0 enrico.migchels over 15 years ago in reply to Catwell

    Hi Cabe,

     

    I have 1 delicate component here also. A component with an input shutdown level of 500mV. If this input is high-ohmic, external noise will kill the function. If the input is low-ohmic (3kOhm, 1nF) there is no problem. That is why i asked. Shielding is changing the coupling between the transmitter (noise source) and the receiver (your IC). If you could fix the problem by improving the layout or external filtering this will save you a lot of trouble.

     

    I use a nice tool to test the susceptibility of a circuit. It is a standard piezo ignitor (kitchen use) and there is a bnc connector at the top where the spark is. On that connector you can place a loop antenne (H) or plate (E). Just small antenna's for precise use. You can easily spot the weak circuits in your design by zapping in the air just a few cm's above the components.

     

    Best regards,

     

    Enrico Migchels

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  • Thomas
    0 Thomas over 15 years ago in reply to Catwell

    Hi Cabe,

    If it is external noise, please try a metallic enclosure and ground it at a point nearest to the supply filter.

    Regards,

    Thomas

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