DOI: 10.1109/TMTT.2023.3341393   IEEEXplore: https://ieeexplore.ieee.org/document/10363629

16-QAM modulator designed with a varactor-based passive reactive mixer in 22 nm FD-SOI CMOS

2.4 GHz carrier, 4.8 GHz LO

Unconventional I/Q modulator implementation with a passive reactive mixer based on time-varying varactors simplifies the baseband circuit design, and in particular, the mixer interface..

Energy-efficient high-order modulation IoT transmitters

2.7 dBm average Pout from 2.27 to 2.55 GHz, 280 MHz 3dB bandwidth; 2.4 MBaud symbol rate, 9.6 Mb/s using 16-QAM; -24.5 dB EVM; 22% system efficiency.