The proposed architecture of the DPD (Digital Pre-Distortion) system implementing comparator and the LSDAC (Low Speed Digital-to-Analog Converter) in the feedback path is developed. At the beginning, baseband digital signal is converted to the analog do- main and IQ branches are up-converted to desired carrier. Mixed signal continuous through the PA, and finally, its certain portion is coupled back into the feedback path. The feedback signal is down-converted and passed to the comparator input along with the signal from the LSDAC of a set voltage level.
The designed architecture consists of an FPGA (Field Programmable Gate Array) module, a DAC (Digital- to-Analog converter) module and an acquisition module. The acquisition module is the main objective of the development.
The documentation can be downloaded from 
Documentation.
The design files can be found here.