The analysis and design trade-offs of a simple and economical technique to implement wideband low-voltage CMOS instrumentation amplifiers (IAs) based on indirect current feedback (ICF), are described. The input and an output transconductors consist of two super-source-followers and a resistor. As a result, the overall performance of the IA is enhanced. A thorough analysis of the proposed technique provided valuable insight on its operation. Two different realizations in 0.35-$\mathrm{\mu }$m CMOS technology of an IA operating with a supply voltage of 3 V, are presented. In particular, a wide bandwidth single-stage IA with fixed voltage gain equal to 50 V/V and a low-power two-stage IA with externally programmable voltage gain, have been designed and characterized by extensive simulations. The simulated results of both circuits showed an improved response in terms of bandwidth, noise and power consumption, while their overall performance is comparable to other proposed approaches in terms of common-mode rejection ratio (CMRR) and linearity (THD).

描述了一种基于间接电流反馈（ICF）实现宽带低压CMOS仪表放大器（IAs）的简单经济的技术的分析和设计折衷。输入和输出跨导体由两个超级源跟随器和一个电阻组成。结果，增强了IA的整体性能。对提出的技术进行了透彻的分析，为其操作提供了宝贵的见识。0.35-中的两种不同实现$\mathrm{\mu }$提出了在3 V电源电压下运行的IA的CMOS技术。特别是，已经设计并通过广泛的仿真对具有固定电压增益等于50 V / V的宽带单级IA和具有外部可编程电压增益的低功耗两级IA进行了设计和表征。两种电路的仿真结果均显示出在带宽，噪声和功耗方面的响应得到改善，而它们的整体性能在共模抑制比（CMRR）和线性（THD）方面可与其他拟议方法相媲美。