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Design >> Mixed-Signal Design >> impact of SFDR
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Message started by VNF on Nov 12^th, 2013, 9:14am

Title: impact of SFDR
Post by VNF on Nov 12^th, 2013, 9:14am

Hi,
I wonder what is the real impact of SFDR by itself?
e.g. two ADCs having the same SINAD, one has a better or wrose SFDR than the other, then how is that difference in SFDR reflected in the end?

thanks,
Kev

Title: Re: impact of SFDR
Post by aaron_do on Nov 12^th, 2013, 11:52pm

Hi,

In the context of a communications system, it affects your bit error rate.

regards,
Aaron

Title: Re: impact of SFDR
Post by rfmagic on Nov 23^rd, 2013, 3:44pm

As SINAD determines the ENOB of the two converters the bit error rate will probably be the same for both.
If SFDR is different between the 2 converters it means that SINAD is dominated by non-linear distortion while the other converter is dominated by random noise. Based on this information you can determine how and what to improve in the circuit level in order to get better SINAD.