A CMOS Polar Single-Supply Class-G SCPA for LTE NB-IoT and Cat-M1

A digital polar PA for LTE-based cellular Internet of Things (CIoT) is presented. It features a class-G back-off efficiency enhancement, using only one single supply. The PA consists of a number of parallel switched-capacitor (SC) cells. Each cell can be configured in two output-power modes, using only a single supply. At 807MHz, the peak output power is 27.1dBm, with an efficiency (PAE) of 33.3%. The efficiency at −6dBps and −12dB ps is 22.5% and 14.4% respectively, which is an improvement of 1.3x and 1.7x compared to class-B. The 13-bit resolution enables a power-control range for Cat-M1 and Cat-NB1 signals of >63dB. In that range, the EVM is <4.2%.