EVM Testing Method for Programmable RF Transceivers

Error Vector Magnitude (EVM) is a pivotal metric for evaluating the modulation quality and comprehensive performance of digital receivers. As programmable Radio Frequency (RF) transceivers evolve toward System-on-Chip (SoC) architectures-where RF analog front-ends and digital basebands are deeply integrated-traditional testing methods relying on external Vector Signal Analyzers (VSA) face significant challenges, such as inaccessible digital interfaces and fragmented testing links. This paper proposes an FPGA-based on-chip EVM selftest method. By constructing a virtual VSA and Vector Signal Generator (VSG) within the system, a complete workflow for QAM modulation/demodulation and EVM calculation is established. Through the optimization of shaping filter parameters and improvements in timing and carrier synchronization algorithms, the proposed method achieves high-precision measurement while maintaining hardware resource efficiency. Experimental results demonstrate that this method offers excellent stability and engineering feasibility, providing a low-cost, deployable solution for the performance verification of highly integrated RFSoCs.