用于血氧传感器的斩波放大器分析  

The Chopper Amplifier for the Seusor Probing Oxygen in Blood

作　　者：陈俊杰[1] 姚兴四 

机构地区：[1]南通纺织工学院

出　　处：《自动化与仪器仪表》1994年第2期42-45,共4页Automation & Instrumentation

摘　　要：本文介绍了用于血氧传感器的高灵敏度ＣＭＯＳ斩波放大器并对其设计思想、工作原理，特性及各部分功能作了分析。该电路能够检测ｎＡ级范围的直流电流并能剔除噪声（特别是低频时在噪声总量中占有优势的噪声）和减少漂移。它被制作成单块芯片，用２－μｍＰ片ＣＭＯＳ工艺集成并采用开关电容技术。测试结果表明，其输出电压与输入电流之间仅３．５％的非线性。本文的论述将有助于国内的开发利用。A highly sensitive CMOS chopper amplifier for the sensor probing oxygen inblood and its design thought, working principle, characteristic and the part functionis introduced and analysed in this paper.The circuit can be used to probe the DC current of BA range and can get rid of noise and reduce the drift. If which is fabricated into a singly chip with 2￣pm p CMOSprocess and switched-capacitor technique,a non-linearity of 3.sqo between the output voltage and the input current can thenho achieved.

关 键 词：血氧传感器 斩波放大器 血液 测定 

分 类 号：R446.11[医药卫生—诊断学]