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FMCOMMS1 High pass filtering

Question asked by luca.cucchi on Dec 21, 2015
Latest reply on Dec 22, 2015 by luca.cucchi

Hi,

I'm using the FMCOMMS1 mounted on the ZC706 in order to acquire baseband complex signal.

I bypass the RF and the demodulator section of FMCOMMS1 and I provide directly in J11&J13 with complex BPSK-like signal coming from an Agilent Baseband signal generator at Zero-IF.

I've noticed a sort of high pass filtering that blocks considerably the DC component, as you can see from the attached figures.

Could you please explain that ? Is it normal ? Can you suggest any procedure to reduce it ?

In the simulation, I've generated a BPSK signal at 5 Mbps and the sampling frequency set in the board is 40 MHz.

 

Thank you

Regards

Luca

 

bpsk-zoom-75mhz.png

 

bpsk-zoom2.png

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