RF BASIC

Can you please specify to which product are you referring, if you have any questions about AD936X please post here?

For general basics refer to the below link for your question.

https://www.rfwireless-world.com/Tutorials/RF-mixer-basics-tutorial.html

About ad9361 only sir

AD936X devices have an IQ mixer.

Hi SIR  Please provide the AD9361  Reference  spectrum For  QPSK modulated signal.

we getting the spectrum but it is correct or not we are not concluding

please confirm sir we are generating IQ qpsk modulation

were you able to demodulate the waveform in spectrum analyzer and measure the EVM

sir How to Check EVM.

and Is spectrum is correct or not?

Please send the refernce spectrum we will compare with that

Please check by using the VSA analyzer.

Below are things need to do before porting data into AD9361. for the waveform in your case it is QPSK, first, verify the waveform at baseband level and plot the digital data, once you are satisfied with IQ data in the simulation, port the same things in AD9361 and check the performance. Please make sure to keep the data rate for the AD9361 same as the waveform.

we can't support custom-based design, and users need to validate the waveform and conclude the characteristics. 

Attached is the example QPSK waveform file, use this for evaluation.

4062.qpsknofilt_30M.txt0677.qpskwithfilt_30.72M.txt

Sir, we actually not aware of the process of demodulation through spectrum analyzer. Can u attach the link of tutorial/guidance.

should we need to use external LO for demodulation