RFSoC 4x2 loopback

Board : RFSoC 4x2

I want to output a signal at 2GHz to a DAC via QICK and check the output from the ADC via a loopback connection. I want to check the signal waveform like on an oscilloscope. or want to measure frequency of signal. If you know how to implement it, please let me know. have a nice day!

QICK have their own support channel: Welcome to the QICK documentation! — qick 0.2.204 documentation
You may be better posting questions about QICK there.

For PYNQ, a Spectrum Analyzer is one of the designs included in the PYNQ image for the RFSoC 4x2. It would allow you to do the loopback testing/test externally as you describe.