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

被引：6
|
作者：
Koay, Kuan Chuang [1 ]
Chan, Pak Kwong [1 ]
机构：
[1] Nanyang Technol Univ, Sch Elect & Elect Engn, Singapore 639798, Singapore
来源：
IEEE SENSORS JOURNAL | 2018年 / 18卷 / 15期
关键词：
Transconductor; switched-capacitor circuit; voltage-to-current converter; voltage-to-frequency converter; Internet-of-Things; RESISTIVE-BRIDGE SENSORS; FRONT-END; INTERFACE; LINEARITY; READOUT; OUTPUT;
D O I：
10.1109/JSEN.2018.2846635
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
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.
引用
收藏
页码：6245 / 6253
页数：9
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