Improving DPD performance by compensating feedback loop impairments in RF ADCs

In this paper the feedback loop´s impairments using radio-frequency (RF) analog-to-digital converters (ADCs) will be studied as a way to improve the digital predistortion (DPD) performance. Specifically, a compensation model for an RF ADC operating in under-sampling regime will be extracted, and applied in a DPD scenario. Significant improvements in the DPD performance will be presented and evaluated in terms of Adjacent Channel Power Ratio (ACPR) and Error Vector Magnitude (EVM).