A SWITCHED-CAPACITOR INTERFACE FOR CAPACITIVE SENSORS BASED ON RELAXATION-OSCILLATORS

被引：14

作者：

CICHOCKI, A ^{[1
]}

UNBEHAUEN, R ^{[1
]}

机构：

[1] UNIV ERLANGEN NURNBERG,W-8520 ERLANGEN,GERMANY

来源：

IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT | 1990年 / 39卷 / 05期

关键词：

D O I：

10.1109/19.58630

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 new switched-capacitor (SC) interface for capacitive sensors has been proposed based on a modified Martin’s relaxation oscillator. The output signal is the duty cycle of a pulsewidth modulated square-wave voltage or a binary-coded digital signal which is directly related to the capacitance ratio of an unknown capacitance Cx and a reference capitance Cr. The circuit can be implemented in a monolithic IC form using presently available CMOS technology. It requires a relative small device count integrable onto a small chip area and it is suited particularly for the on-chip interface circuitry for microprocessors. © 1990 IEEE

引用

页码：797 / 799

页数：3

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