30.2 NB-IoT and GNSS All-in-One System-on-Chip Integrating RF Transceiver, 23dBm CMOS Power Amplifier, Power Management Unit and Clock Management System for Low-Cost Solution

Due to extensive application prospects and huge market potential of narrowband internet-of-things (NB-IoT), there is growing demand for low-power and low-cost system-on-chips (SoCs) and a massive number of wireless devices. For a low-cost solution, the most challenging blocks such as an RF transceiver, an RF power amplifier (RF-PA), and a high-power switching converter have to be integrated to eliminate the need for expensive multichip components. To support power scenarios of NB-IoT, low-power circuits and highly efficient power regulators are needed simultaneously [1]. This work aims for an all-in-one system to integrate all necessary blocks. An RF transceiver is integrated to support multiband cellular IoT and the global-navigation satellite system (GNSS) with a CMOS RF power amplifier. A power-management system (PMIP) including bucks, a boost, and low-dropout regulators (LDOs) is integrated to support coin-cell or AAA battery supply and operate over a wide-input supply voltage from 2.5V to 5V. In addition, a clock-management system is embedded with a digitally controlled crystal oscillator (DCXO), a relaxation oscillator (RCO), and temperature-sensor units (TSUs) [2].