Digital Radio (GC Products)
Options

Forums

Digital Repeater example design

This question is answered
Radio-Joe
Posted by
on Apr 06 2009 19:23 PM
Expert7275 points

Hi,

Is there a Digital Down Converter, Digital Up Converter IF translator design

with an EVM example?

Thanks,

Report Abuse
All Replies
  • Ashwani
    Posted by
    on Jan 27 2010 09:12 AM
    Expert1365 points

    Hi Joe,

     

    Thanks for your reply.

     

    But even numbers of nyquist zone frequency band reversed ie the highest RF signal becomes the lowest IF and the lowest RF signal becomes the highest IF. How to overcome this problem in entire RF design?

    regards

    ashwani

    -Regards.

     Ashwani

    Report Abuse
  • Ashwani
    Posted by
    on Feb 01 2010 07:45 AM
    Expert1365 points

    Hi Joe,

     

    If we select band of interest fron even numbers of nyquist zone, frequency band reversed ie the highest RF signal becomes the lowest IF and the lowest RF signal becomes the highest IF. How to avoid this problem in entire RF design?

    Regards

    Ashwani

    -Regards.

     Ashwani

    Report Abuse
  • Radio-Joe
    Posted by
    on Feb 01 2010 09:10 AM
    Expert7275 points

    Hello Ashwani,

    There are cases where the selected IF band afer A/D conversion is spectrally reversed.  The Digital Down Converter (DDC) can select the image of the signal

    to output a normal IQ representation (ie not spectrally reversed).  I have forwarded your question about mitigation of the RF/IF/DDC planning to Roland Sperlich.

    If you use the Low IF - direct down conversion, or 1st or 3rd Nyquist zone IF sampling, the spectrum will not be reversed.

    Regards,

    Joe Quintal

     

    Report Abuse
  • Ashwani
    Posted by
    on Feb 02 2010 07:57 AM
    Expert1365 points

    Hi,

     

    Thanks Joe.

     

     

    Regards,

    Ashwani

    -Regards.

     Ashwani

    Report Abuse
12

All content and materials on this site are provided "as is". TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with regard to these materials, including but not limited to all implied warranties and conditions of merchantability, fitness for a particular purpose, title and non-infringement of any third party intellectual property right. TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with respect to these materials. No license, either express or implied, by estoppel or otherwise, is granted by TI. Use of the information on this site may require a license from a third party, or a license from TI.

Content on this site may contain or be subject to specific guidelines or limitations on use. All postings and use of the content on this site are subject to the Terms of Use of the site; third parties using this content agree to abide by any limitations or guidelines and to comply with the Terms of Use of this site. TI, its suppliers and providers of content reserve the right to make corrections, deletions, modifications, enhancements, improvements and other changes to the content and materials, its products, programs and services at any time or to move or discontinue any content, products, programs, or services without notice.

TI Worldwide | Contact Us | my.TI Login | Site Map | Corporate Citizenship | mobile m.ti.com (Mobile Version)

TI is a global semiconductor design and manufacturing company. Innovate with 100,000+ analog ICs and
embedded processors, along with software, tools and the industry’s largest sales/support staff.

© Copyright 1995-2013 Texas Instruments Incorporated. All rights reserved.
Trademarks | Privacy Policy | Terms of Use