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7 - Circuit design for EMC - Updated Jan 2021

Provides 1.5 hours towards CPD

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7 - Circuit design for EMC - Updated Jan 2021 image #1
Good Electromagnetic (EM) Engineering… is cost-effective SI, PI and EMC engineering…
 
  • well-proven to save time & money in all lifecycle stages, helping to increase profits & reduce financial risks…
  • for PCBs, modules, products, equipment, vehicles, systems, installations, etc., of any size, in all applications… see Module 1, especially 1.15 (also in Webinar 1c) and 1.16 (also in Webinar 1d)
 
This Module contains many EM Engineering guidelines that should also be used as an initial design checklist: any that can’t or won’t be followed identify a project risk!
 
Module is 114 slides over 57 pages
 
Contents
7.1 Digital circuits
a) Rise/fall times and emissions spectra
b) Numerous digital circuit design techniques
c) Watchdogs and brownout monitors
d) Data scrambling and spread-spectrum clocking
e) Design of firmware and software (new)
 
7.2 Analogue circuits
a) Linearity, bandwidth and stability of feedback circuits
b) Numerous analogue circuit design techniques, using hysteresis in comparators
 
7.3 Switching power converters
a) Cleaning up switching waveforms: using 'spread-spectrum'
b) Snubbers; and reducing output ripple
c) Heatsinks
d) Use SiC Schottky or soft-switching rectifiers, SiC or GaN switching devices
e) The isolating transformer’s interwinding capacitance
f) Don’t over-use galvanic isolation!
 
7.4 Communications circuits
a) Better alternatives to copper cabling
b) How to use copper cabling
c) Common-mode noise reduction techniques
d) Optoisolators and optocouplers
e) Gigabit laser diodes
f) Terminating transmission lines
 
7.5 Some useful references

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