Improving the Accuracy of Capacitance-to-Frequency Converter by Accumulating Residual Charges

被引:14
|
作者
Shin, Dong-Yong [1 ]
Lee, Hyunjoong [2 ]
Kim, Suhwan [2 ]
机构
[1] Samsung Mobile Display, Yongin 449577, South Korea
[2] Seoul Natl Univ, Seoul 151744, South Korea
基金
新加坡国家研究基金会;
关键词
Capacitance-to-frequency converter (CFC); capacitive sensor; integrator; residual charge; TRANSDUCER; INTERFACE; SENSORS; SYSTEMS;
D O I
10.1109/TIM.2011.2147650
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
Recently, capacitive sensors, which consist of a sense capacitor and a reference capacitor, have been considered for a sensor array for monitoring biomolecular reactions. Although a capacitance-to-frequency converter (CFC) may be a simple and effective solution for reading a capacitive difference between the sensor capacitors, prior versions lack sufficient accuracy. In this paper, we present a more accurate CFC, which produces a single pulse stream in a wide range of frequencies. This circuit saves residual charges and accumulates them when discharging an integrator capacitor. Implemented in 0.35-mu m CMOS technology, our circuit improves the accuracy from about 6% to 0.13%.
引用
收藏
页码:3950 / 3955
页数:6
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