DOI: 10.1109/TMTT.2023.3334531   IEEEXplore: https://ieeexplore.ieee.org/document/10329585

Three-port reflectionless downconverter

The innovative design employs reflectionless filters at the IF, RF and LO ports to eliminate reflected signals and significantly reduce gain fluctuation and harmonic generation. The reflectionless design approach improves gain and linearity flatness and system stability, and enhances the error vector magnitude (EVM) and adjacent channel power ratio (ACPR) performance.

Wireless wideband high-order modulation and multi-channel carrier aggregation systems.

3.02% EVM for 300 MHz 256-QAM signal; 4.50% EVM for 400 MHz 64-QAM signal from 0 to 400MHz overlap bandwidth; 0.15% EVM difference between channels for 8 x 40 MHz 256 QAM carrier signals.