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  • IO curve tracing

    When we suspect if a io pad is broken, io curve tracing can help. Apply dc voltage to pad and ground and check current. VI currrent should be as shown for a normal pad. The rapid increasing currents at both pos and neg voltages are due to io esd…[Read more]

  • Crystal osc circuit chip internal drive strength adjust

    A typical xtal osc is shown. Two caps and xtal are external to chip. The op amp is inside chip. To board designers, that op amp driving strength is not fixed. They normally have higher driving strength at bootup to make sure xtal osc…[Read more]

  • Mortensen posted an update 1 year, 5 months ago · , 1, 2

    Which of trace A and B has more critical EMI issue?

    Maybe it is straightforward for a seasoned EMI engineer. This interesting article uses Nimbic nWave to simulate the EMI issue and shows B is more…[Read more]

  • Mortensen posted an update 1 year, 5 months ago · , 1, 2

    Use EMI scanner to see EMI emission and show the effect of decoupling capacitor

    EMI scanner is a powerful and easy-to-use tool to deal with EMI…[Read more]


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