Hi All,
Depending on the system requirements, For mains supplied units, I like
to use the chassis of the power supply to short circuit the noise
currents so they keep inside of the supply. That usually means,
connecting through very low inductance, the circuit ground to the power
supply chassis at its output. A 4 cm wire is too long.
Doug
University of Oxford Tutor
Department for Continuing Education
Oxford, Oxfordshire, United Kingdom
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On 12/1/14 11:47 AM, Amund Westin wrote:
Got a DC / DC converter in an ITE.
>From a radiated emission plot, I can see lot of spikes with spacing 330kHz
in the region 30-80MHz.
The DC / DC converter datasheet tells that the switching frequency is
330kHz.
No suppression components around the converter. I assume a common mode choke
could block some on the noise, so it does not enter the power supply cable,
which may act as an antenna in this case.
Any other "tricks" for EMI suppression of DC / DC converters?
#Amund
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