Radios

Ultra-low power BLE (Bluetooth Low Energy) radio chip used to communicate data from sensor systems to smart devices.

ASSIST is also building Bluetooth-compatible radios that can communicate with standard BL radios but with significant reduction in power consumption. 

Three major techniques are used to reduce the total power consumption of only 0.5 mW, which is an 8X reduction over a state of the art COTs BLE radio: 1) the TX only transmits in one advertising channel packet with open loop direct modulation after every frequency calibration cycle; 2) a successive approximation register (SAR)-assisted frequency locked loop (FLL) is implemented by utilizing a RF/4 frequency ring oscillator (RO) with 4X phases; and 3) a switch-capacitor digital PA (SCDPA) optimized for high efficiency below -5dBm. 

Learn more about the researchers involved with this project: