A fully integrated wireless SoC for in-body pH and temperature continuous monitoring

This paper presents a SoC (System on Chip) dedicated for human alimentary canal pH and temperature monitoring. Sensor interfaces, wireless transceiver, digital logic and power management circuits are all embedded in this SoC. The SoC was fabricated in 0.18μm standard CMOS technology and the area is about 9mm2. The SoC takes 6.15mW power at the data collection and transmission mode. The measurement results show that the system maintains the precision of 0.1 for pH sensing and 0.2°C for temperature sensing, which meets the requirement of in-body pH and temperature monitoring in clinical applications.