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Message started by srikanthvajjala on Jan 12th, 2011 at 12:31pm

Title: specs write up
Post by srikanthvajjala on Jan 12th, 2011 at 12:31pm
Dear Eric,

Thank you for your help. I have a question for you how to write the specs for harmonic rejection,spurious (In/Out of band ) and image frequency rejection for a down converter ? Is there any calculations involved in this ? Please send any literature which related to the above.

Regards,
SRIKANTH

Title: Re: specs write up
Post by Eric Johnston on Jan 12th, 2011 at 4:47pm
In the last 10 years I've not thought much about the specs for downconverters (e.g C band or Ku band down to 70 MHz).  We used to use whatever kit was supplied by reputable manufacturers.  I rather thought that such devices were now near obsolete, now that L band is so common as an earth station IF.

I suggest you look at the specification of competitors equipment and search the internet for relevant documents regarding the design of downconverters. Google for terms like .. direct down conversion receiver design.
Sample documents:
http://iroi.seu.edu.cn/prepare/Meeting/File/SODC/F/SODC/biltzer.pdf
http://focus.ti.com/lit/ds/symlink/trf371109.pdf
http://notes-application.abcelectronique.com/052/52-39543.pdf

If you say much more specifically what you are trying to do maybe someone else help please do so.

Best regards, Eric

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