A 0.18- $\mu$ m CMOS Voltage-to-Frequency Converter With Low Circuit Sensitivity

A process, voltage, and temperature insensitive resistor-to-frequency converter is proposed. This insensitivity is achieved by matching the current-defining capacitor in a novel switched-capacitor (SC) voltage-to-current (V-I) converter with the integrating capacitor in a conventional relaxation oscillator. Implemented in 0.18-μm CMOS technology, the SC V-I converter together with the relaxation o...