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FPGA output pulsating in real time

Started by abdul_samad 1 month ago1 replylatest reply 1 month ago22 views

Hi,

I am working on a digital down conversion module for a project of mine. The module down converts a  signal at IF 455 KHz received through an ADC, multiplies it with a carrier generated through DDS and then low pass filters the final output. The final demodulated single of 3 KHz keeps pulsating with time.

I have attached a video sample of the following output. I would appreciate any kind of help regarding this matter. WhatsApp Video 2019-06-15 at 10.22.06 AM.mp4

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Reply by kazJune 15, 2019

You will need full debugging on all inputs/outputs from ADC to mixer to filter to observation tool. Otherwise it is all guess work. Pulsating waveform could be generated anywhere along.

Kaz