Unitary vs. Resistive Feedback in CMOS Two-Stage Indirect Current Feedback Instrumentation Amplifiers

被引：0
|
作者：
Corbacho, Israel [1 ]
Carrillo, Juan M. [1 ]
Ausin, Jose L. [1 ]
Dominguez, Miguel A. [1 ]
Duque-Carrillo, J. Francisco [1 ]
机构：
[1] Univ Extremadura, Dept Elect Elect & Automat Engn, Avda Elvas S-N, Badajoz 06006, Spain
来源：
2020 27TH IEEE INTERNATIONAL CONFERENCE ON ELECTRONICS, CIRCUITS AND SYSTEMS (ICECS) | 2020年
关键词：
class-AB output stage; indirect current feedback; instrumentation amplifier; super source follower;
D O I：
10.1109/icecs49266.2020.9294807
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：
Two approaches to establish the feedback loop in a two-stage CMOS indirect current feedback (ICF) instrumentation amplifier (IA), i.e., unitary feedback (UF) and resistive feedback (RF), are compared in this paper. To this end, the transistor level implementation of the IA has been enhanced. Super source followers have been used to build the input and output transconductors required in the ICF approach. Besides, the IA has been provided with a class-AB output stage in order to handle with low resistive loads. The proposed IA has been designed in 180-nm standard CMOS technology to operate with a 1.8-V supply. Simulation results show that RF allows external programmability and leads to a more accurate value of the IA voltage gain, whereas UF provides a superior response in terms of noise, thus leading to better noise efficiency factor and similar dynamic range metrics.
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页数：4
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