Features and Design Constraints for an Optimized SC Front-End Circuit for Capaci

Abstract

This paper presents optimization criteria for an inte- grated switched-capacitor front-end circuit for capacitive sensors with a wide dynamic range. The principle of the interface is based on the use of a relaxation oscillator. A negative-feedback circuit controls the charge-transfer speed to prevent the overload of the input amplifier for large input signals which thus enables a wide dynamic range of capacitor values. Moreover , it has been shown that the use of negative feedback can also result