3.1. Introduction3.2. Measuring temperature, temperature differences, and temperature changes in industrial applications3.3. Temperature-sensing elements3.4. Basic concepts of smart temperature sensors3.5. Methods to improve the accuracy of CMOS smart temperature-sensor systems3.6. Principles of BJT-based smart temperature sensors with DCM3.7. Signal processing of duty cycle modulated signals3.8. Fabrication and test results3.9. Summary