USRP 2920 IF after down mixed (after MIXER) ?

[M_Shaban]

Hi _ Ni
the device NI USRP-2920 is a good product i use it for training students on some apps
i read manual for this product its mostly usfel and covering most of device specification BUT " No thing mention about
Center Frequency of ( IF ) band "
to make my question clear " when signal down mixed from RF to IF it wil be centered arround fixed frequency for demodulation processs " its about 12.5 MHz in one of your device NOT USRP "
What is center frequency of base band signal after down mixed ??
i wish that i can explained my problem , iam waiting your reply with answer or tell me of you want more than explanation about what i want to now ..
Thanks

[ErikL · Accepted solution]

This is a direct down conversion device. RF is mixed to quadrature baseband I and Q. There is no IF.

[M_Shaban]

Are vco and pll Use for directly conversion of signal with mixer to I/Q ?

[muffin.vi · Accepted solution]

Yes, check out section three of this white paper: http://www.ni.com/white-paper/12985/en/

[AgentAstronaut · Accepted solution]

Hi M_Shaban,

That is correct. The LO is used in the mixer for the conversion to IQ data.

Here is an article on USRP Architecture:

What Is NI USRP Hardware?

http://www.ni.com/white-paper/12985/en/

Regards,

Michael

[M_Shaban]

Thanks to all 😌
I appreciate your help