A low-voltage low-power instrumentation amplifier based on supply current sensing technique

被引：10
|
作者：
Safari, Leila [1 ]
Minaei, Shahram [2 ]
Ferri, Giuseppe [1 ]
Stornelli, Vincenzo [1 ]
机构：
[1] Univ LAquila, Dept Elect & Informat Engn, Via Gronchi 18, Laquila, Italy
[2] Dogus Univ, Dept Elect & Commun Engn, Acibadem, TR-34722 Istanbul, Turkey
来源：
AEU-INTERNATIONAL JOURNAL OF ELECTRONICS AND COMMUNICATIONS | 2018年 / 91卷
关键词：
Instrumentation amplifier; CMRR; Op-Amp supply current sensing technique; WIDE-BAND; CMRR;
D O I：
10.1016/j.aeue.2018.04.011
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：
In this paper a new low-voltage low-power instrumentation amplifier (IA) is presented. The proposed IA is based on supply current sensing technique where Op-Amps in traditional LA based on this technique are replaced with voltage buffers (VBs). This modification results in a very simplified circuit, robust performance against mismatches and high frequency performance. To reduce the required supply voltage, a low-voltage resistor-based current mirror is used to transfer the input current to the load. The input and output signals are of voltage kind and the proposed IA shows ideal infinite input impedance and a very low output one. PSPICE simulation results, using 0.18 mu m TSMC CMOS technology and supply voltage of +/- 0.9 V, show a 71 dB CMRR and a 85 MHz constant -3 dB bandwidth for differential-mode gain (ranging from 0 dB to 18 dB). The output impedance of the proposed circuit is 1.7 Omega and its power consumption is 770 mu W. The method introduced in this paper can also be applied to traditional circuits based on Op-Amp supply current sensing technique.
引用
收藏
页码：125 / 131
页数：7
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