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

作者：Koay Kuan Chuang^*; Chan Pak Kwong

来源：IEEE Sensors Journal, 2018, 18(15): 6245-6253.

DOI：10.1109/JSEN.2018.2846635

• Transconductor
• switched-capacitor circuit
• voltage-to-current converter
• voltage-to-frequency converter
• Internet-of-Things

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-mu m CMOS technology, the SC V-I converter together with the relaxation oscillator and voltage regulator occupies 0.45 mm(2). This paper has shown a sensitivity of 199.9 Hz/(mu Omega/Omega), which is based on a center frequency of 125 kHz. Testing with a commercial sensor, the sensor interface has demonstrated a sensitivity of 1.269 kHz/psi. The sensor interface consumes only 112.5 mu W at 1.5-V power supply. Therefore, it is suitable for Internet-of-Things applications.

• 出版日期2018-8-1
• 单位南阳理工学院