ABSTRACT
Ultra-low power/energy efficient wireless sensing microsystems plays an important role in the upcoming internet of things era, with emerging applications including medical, surveillance, and environmental monitoring and many more. Being one of the most common measurement parameters, high performance complementary metal–oxide–semiconductor (CMOS) temperature sensors become an important design element of such microsystems. This chapter covers the fundamental knowledge and operating principles of CMOS temperature sensors. It analyses the main sources of inaccuracy followed by possible circuit/system level solutions to achieve high power/energy efficiencies. The chapter introduces the case studies of state-of-the-art CMOS temperature sensors. CMOS temperature sensors generally requires an analog frontend, a sensor interface which is generally a custom designed analog-to-digital converter, and a digital backend for control, calibration and data processing purposes. The chapter introduces the use of different sensing devices, especially Bipolar Junction Transistor and Metal Oxide Semiconductor Field Effect Transistor, for CMOS temperature sensor implementations.
