采用LT1228商用集成电路的占空比电子可调三角波/方波发生器，用于电容式传感器接口。

Duty-Cycle Electronically Tunable Triangular/Square Wave Generator Using LT1228 Commercially Available ICs for Capacitive Sensor Interfacing.

作者信息

Silapan Phamorn, Choykhuntod Pawich, Kaewon Rapeepan, Jaikla Winai

机构信息

Department of Electrical Engineering, Faculty of Engineering and Industrial Technology, Sanam Chandra Palace Campus, Silpakorn University, Nakhonpathom 73000, Thailand.

Department of Engineering Education, School of Industrial Education and Technology, King Mongkut's Institute of Technology Ladkrabang, Bangkok 10520, Thailand.

出版信息

Sensors (Basel). 2022 Jun 29;22(13):4922. doi: 10.3390/s22134922.

DOI:10.3390/s22134922

PMID:35808410

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9269504/

Abstract

This paper proposes a duty-cycle electronically tunable triangular/square wave generator using LT1228 commercially available ICs for capacitive sensor interfacing. The generator comprises two LT1228s, a grounded resistor, and a grounded capacitor. The circuit provides two output signals which are triangular and square waves. Both signals are regulated by adjusting the current bias. Likewise, the amplitude of the triangular signal can be tuned electronically without affecting the frequency. In addition, the square wave can independently control the linear duty cycle via tuning the voltage. Experiment results confirm the performance of the proposed circuit that the amplitude of the triangular wave, frequency, and duty cycle are linearly controllable via current or voltage, which do not affect each other. The duty cycle, the amplitude of the triangular wave, and frequency have maximum errors of ±1.60%, ±3.33%, and ±2.55%, respectively.

摘要

本文提出了一种占空比电子可调的三角波/方波发生器，该发生器使用LT1228商用集成电路用于电容式传感器接口。该发生器由两个LT1228、一个接地电阻和一个接地电容组成。该电路提供两个输出信号，即三角波和方波。两个信号均通过调节电流偏置进行调节。同样，三角波信号的幅度可以在不影响频率的情况下进行电子调谐。此外，方波可以通过调节电压独立控制线性占空比。实验结果证实了所提出电路的性能，即三角波的幅度、频率和占空比可通过电流或电压进行线性控制，且它们之间互不影响。占空比、三角波幅度和频率的最大误差分别为±1.60%、±3.33%和±2.55%。