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How to set the Rx IF frequency in the reference design?

Question asked by georgeji on Jan 12, 2013
Latest reply on Jan 12, 2013 by georgeji

Hi Robin,

 

In AD-FMCOMMS1-EBZ Functional Overview, we can see the following description:

 

Receive

...

 

In the receive direction, the system converts a RF signal into complex I and Q signals. The RF signal is demodulated by the ADL5380 to a suitable complex IF (50MHz to 200MHz). The I and Q IF signal is filtered and then passed to the AD8366 DVGA, which provides upto 15.75dB of gain. An anti-alias filter is used to remove harmonics and other out of band signals before the signal is digitized with the AD9643.

 

It looks like that the intermediate frequency (IF) is used there.

Can you explain it further?

 

Thanks,

 

George

 

 

 

On 2013-01-11 20:00, rgetz wrote:

> ENGINEERZONE [1]

>

>  RE: DO WE NEED TO USE AD-FMCOMMS1-EBZ.HEX FILE IN THE PROJECT, AND

> HOW TO SET IT UP?

>

>  created by rgetz [2] in _FPGA Reference Designs_ - View the full

> discussion [3]

> -------------------------

>

> George:

>

> Rf is demodulated to baseband. There is no intermediate frequency (IF).

>

> So, I'm not sure we understand the question.

>

> Rf (400 - 4000MHz) is demodulated to baseband (which can capture over

> 100 MHz of bandwidth).

>

> -Robin

 

On 2013-01-11 19:18:

> Hi Andrei,

>

> In the receiver of reference design, the RF signal is demodulated by

> the ADSL5380 to a suitable complex IF(50MHz to 200MHz). Can you tell

> me how/were to change it in the reference code (For instance, to set

> IF frequency to 90MHz.)?

>

> Thanks,

>

> George

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