A ±0.5dB, 6nW RSSI Circuit with RF Power-to-Digital Conversion Technique for Ultra-low Power IoT Radio Applications.

This paper presents a new technique of radio frequency (RF) signal strength detection with a received signal strength indicator (RSSI) circuit which can be deployed in an internet-of-things (IoT) network. The proposed RSSI circuit is based on a direct conversion of RF to digital code indicating the signal strength. The direct conversion is achieved by the repeated switching of a rectifier's output voltage using an ultra-low power comparator.