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Friday Quiz: PCB Design

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MeasurementBlues
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Re: Making it look easy...
MeasurementBlues   9/14/2016 4:16:41 PM
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See Bogatin's Rules of Thumb, now at 32.

ericha
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Re: PCB Quiz
ericha   9/8/2016 9:30:26 PM
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However the trace length shouldn't have any impact on the characteristic impedance, thus "e" is the best answer.

David Ashton
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PCB Quiz
David Ashton   9/2/2016 7:04:11 PM
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Thanks as always Martin.  Did pretty well considering I have only made PCBs by dark ages methods :-)  I would argue that 1, which I got wrong, should have been "all of the above" - a-d will influence impedance but will also have a bearing on other capabilities, eg current carrying ability, resistance etc.  

MWagner_MA
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Making it look easy...
MWagner_MA   9/2/2016 7:20:51 AM
Good PCB design skills in the journals are frequently focused on the Ghz rates and above, but the reality it is is imprerative at frequencies much, much lower.  Even microcontroller designs with clock speeds in the 10-20Mhz require good skills to have good signal integrity with mixed-signal designs and to pass EMI tests on the first or second try.  Crosstalk, and ringing will be present if not cared for in the design even with these microcontroller designs with geometries pushed to higher densities.  Understanding the fundamentals of capacitance, and inductance of traces as they compare to circuit elements is a huge part of first pass sucess in mixed signal design.  My "go to" information source for such material is Dr. Howard Johnson and Dr. Eric Bogatin.  Both have excellent books well worth the price.

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