A Watt level, 5-7GHz all digital polar TX based on 3.3V switched capacitor digital PA in 16nm Fin-FET for Wi-Fi7 applications

This work presents a fully integrated 5-7GHz all digital polar transmitter (DPTX) capable of supporting 320M/4096-QAM (MCS13) OFMD modulation for WiFi 7 applications in 16-nm Fin-FET CMOS technology. The DPTX is based on a novel transistor stacking with capacitive feedback topology, allowing a switch capacitor digital power amplifier (SC-DPA) to work directly from 3.3V supply. The DPA demonstrates a maximum power (Pmax)/power efficiency (PE) of 30.15dBm/34.7% at 5.2GHz. An error vector magnitude (EVM)/power consumption of -38dB/830mW is measured at 6.1GHz and 9-dB backoff (dBBO) from Pmax, thus meeting MCS13 4096-QAM OFDM Wi-Fi7 requirement.