CMRR in Voltage-Op-Amp-Based Current-Mode Instrumentation Amplifiers (CMIA)

被引：18
|
作者：
Azhari, Seyed Javad [1 ]
Fazlalipoor, Hossein [2 ]
机构：
[1] Iran Univ Sci & Technol, Electron Res Ctr, Tehran 16844, Iran
[2] Azad Univ Ahar, Ahar 54516, Iran
来源：
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT | 2009年 / 58卷 / 03期
关键词：
Common-mode rejection ratio (CMRR); current-mode instrumentation amplifier (CMIA); gain bandwidth of CMIA; voltage op-amp (VOA)-based CMIA; REJECTION RATIO;
D O I：
10.1109/TIM.2008.2005559
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：
The common-mode rejection ratio (CMRR) of a power-supply current-sensing current-mode instrumentation amplifier (CMIA) has theoretically been analyzed and formulated. The theory was further investigated by doing experiments using mu A741 and TL071 as op-amps and CA3096 transistors as the current mirrors of the CMIA. Both theoretical and practical investigations proved that both the do and ac performances of CMRR depend on the matching status of parameters such as CMRR, open-loop gain A, gain-bandwidth product GB, and the output resistance R-O of the input op-amps of the CMIA. It has also been shown that, in the CMIA, unlike the voltage-mode instrumentation amplifier, voltage gain is independent of the bandwidth.
引用
收藏
页码：563 / 569
页数：7
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