Signal Integrity Quiz

by | Nov 17, 2017 | 8 comments

Many PCBs now operate at digital signal frequencies of 10 GHz and higher, which means that appropriate measures are needed to prevent unacceptable signal degradation and their consequential errors. How much do you know about signal integrity? Take the quiz to find out!

 

Results

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#1. How is the rise time of a signal often measured?

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#2. What do changes in the impedance that a signal sees cause?

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#3. What is the best thing to do if you want to increase the capacitance of a via?

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#4. What is not true about propagation delays?

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#5. Which of the following is not a step to mitigate signal degradation?

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#6. Where does the electric signal travel fastest?

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#7. What does signal attenuation lead to?

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#8. How can you minimize supply voltage fluctuations?

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#9. What is the definition of crosstalk?

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#10. What can you do to reduce crosstalk?

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#11. Distance D spaces a pair of microstrip traces apart, and H is the separation from the ground plane. Which of the following generates greatest amount of cross talk?

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#12. How can you minimize signal attenuation?

finish

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8 Comments

  1. Avatar

    Good to have bought SI awareness by Quiz

    Reply
  2. Avatar

    Hello,
    That was a great quiz.
    I am not a Signal Integrity engineer but am interested and keen to learn.
    Could you please explain something about the effect of “soldermask”.
    I do appreciate your answers on questions 6 and 10.

    Thanks and Best Regards,
    Raymond

    Reply
  3. Avatar

    I am an analog custom silicon designer. I enjoyed the quiz very much. Thank you!

    Reply
    • Lucy Iantosca

      Thanks 🙂

      Reply
  4. Avatar

    Everything else being identical, does a PCB with thin layers of dielectric material (42 mils) is likely to radiate less compared to a PCB with thick dielectric layer (62 mils).
    What is main consideration in selecting a dielectric material (out of so many) regardless of cost when designing a PCB

    Reply
    • Avatar

      Hi, Bhupendra

      Thank you for writing in!

      The radiation in a PCB primarily depends on the length of the trace than the thickness of the dielectric material used. However, the radiation increases with the thickness of the dielectric material due to the current looping effect. Yes, the 42 mil thickness PCB will radiate lesser than a 62 mil thickness PCB.

      The most important characteristics to be considered while selecting PCB material are dielectric constant and loss Tangent. To know more about it, read our article How to choose PCB materials and laminates for fabrication.

      Reply
  5. Avatar

    Hi,
    That was a good quiz.

    Reply

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