Energy Efficient Phase Domain RF Receivers for Internet of Things (IOT) Applications
This paper presents an ultra low power 2.4 GHz FSK/PSK RX for wireless personal/body area networks. An energy efficient single channel phase domain receivers based on a sliding IF phase to digital conversion (SIF PDC) loop is presented. It equivalently transforms the signal processing from analog I/Q domain to the digital phase domain, which save almost 40 power consumption. A phase rotator is employed in the phase tracking loop to decouple the carrier generation and frequency demodulation, which guarantees the frequency stability and enables wideband operation. The analog multiplier and the single bit quantization implementation improves the interference rejection. Fabricated in a 90 nm CMOS technology, the presented RX consumes 2.4 mW at 2 Mbps data rate, i.e. 1.2 nJ/b efficiency, and achieves a sensitivity of 92 dBm.