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.