A Fully Integrated 27-dBm Dual-Band All-Digital Polar Transmitter Supporting 160 MHz for Wi-Fi 6 Applications

Abstract

This work presents a dual-band polar digital transmitter (P-DTX) based on a digitally controlled two-point edge interpolation digital-to-time converter, which is capable of supporting Wi-Fi 6 applications. The proposed P-DTX is fabricated in a standard 28-nm CMOS process. The 2.5/5GHz digital power amplifiers (DPAs) reach a maximum power (P <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">MAX</sub> )/power efficiency (PE) of 27 dBm/53% and 27dBm/37%, respectively. The transmitter meets an error vector magnitude (EVM)/DPA PE/total TX power dissipation of -30.5 dB/33%/532 mW for the low band and -29 dB/26%/718 mW for the high band at 6-dB backoff (dBBO) from PMAX. An EVM as low as -40 dB is achieved using digital pre-distortion at 7-8 dBBO, for 20-160-MHz signal bandwidths, thus demonstrating MCS11 1024-QAM OFDM Wi-Fi 6 operation.