[SI-LIST] Reg. EMI/EMC problem..
- From: chundi srikanth <chundis@xxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Wed, 10 Mar 2010 00:08:48 +0530
Hi Techies,
Will it be a problem if we use a switching power supply for RF devices like
High-speed DAC and ADCs? What are the precautions we need to take if we are
going to use a switching power supply for some high sped RF devices and how
to over come them?
Right now we have designed on eboard in which one switching power supply was
placed near the DAC. And the switching frequency is 500KHz. Now wehen i
observed the RF DAC in spectrum analyzer iam observing a spur at 239KHz of
level -60dB. If i remove the inductor in that supply path and given the
external power to the DAC then the spur is not seen. So can you suggest me
what might be the problem here. And how to over come this problem.
Thanks & Regards
Srikanth
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