How to generate a particular RF spectrum using ADC/DAC with Zynq
I am working on a reference design provided by Analog device (ADRV9361-z7035) . Its have real time bandwidth 56 MHz and range from 70 MHz to 6 GHz . i want to generate a particular spectrum of 20 MHz . I need some background knowledge that how we can generate a particular spectrum or particular waveform by storing samples in some ADC-FIFO and then transmit to DAC .
Basically i want to understand if some one wants to generate a 20 MHz spectrum , how much samples needed store and what DSP involve in background . Kindly any useful document related this will be highly appreciated .