Recently I'm working on a project with AD9364.
We plan to use AD9364 to recieve a modulated narrow-band signal (AM Amplitude Modulation, carrier frequency =245MHz, 1KHz single tone is modulated to the carrier ). We choosed FPGA to do the AM demodulation part.
We use signal generator to generate RF to 245MHz (only carrier without modulation),set LO to 245MHz (=RF).Thus the data of I channel P0D is as follow:
the data of Q channel P1D is as follow:
Then set the generator AM modulation(1KHz tone) on ,the result data of demodulation is as follow:
But when i change the RF carrier (without modulation ) to 245.01MHz,LO is still 245MHz (10KHz offset),the data of I & Q channel is as follow:
It looks perfect.
Looks much better ~~~
I wonder why it has two different results. Does the DC-offset affect the RX chain performance?
If we insist on the first way (RF=245MHz,LO=245MHz),how can i make it right? Which registers do i need to config?
Thank you so much~
Sorry about my poor english ,wish it wouldn't make you confused! ^_^!!