An algorithmic instrumentation amplifier (INA) with dynamic analog signal processing (DASP) is presented in this article. The proposed approach is based on any basic INA (BINA) subjected to a simple algorithmic operation performed by DASP. The resulting common-mode rejection ratio (CMRR) equals double squared CMRR value of the BINA, with no need for any additional matching. The prototype has been made in a discrete technique with a single supply voltage of 2.7 V. The voltage-mode INA(VMIA) with two operational amplifiers (OAs) has been used as the BINA. The measurements have been performed for six different clock pulse frequencies ranging from 30 to 80 kHz with a step of 10 kHz used in the DASP. The resulting CMRR of 90.03, 80.35, 66.48, and 53.15 dB are achieved starting from a poor CMRR of 42.52, 36.80, 30.09, and 23.76 dB of the BINA, respectively, confirming the proposed CMRR enhancement model $2\times $ CMRR [dB] +6 dB.

中文翻译：

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使用具有动态模拟信号处理的算法方法在仪表放大器中增强 CMRR

本文介绍了一种具有动态模拟信号处理 (DASP) 功能的算法仪表放大器 (INA)。所提出的方法基于任何受 DASP 执行的简单算法操作的基本 INA (BINA)。由此产生的共模抑制比 (CMRR) 等于 BINA 的 CMRR 值的平方，无需任何额外匹配。该原型采用分立技术制造，单电源电压为 2.7 V。带有两个运算放大器 (OA) 的电压模式 INA(VMIA) 已用作 BINA。已针对 DASP 中使用的 30 至 80 kHz 的六个不同时钟脉冲频率执行了测量，步长为 10 kHz。从 BINA 的 42.52、36.80、30.09 和 23.76 dB 的较差 CMRR 开始，实现了 90.03、80.35、66.48 和 53.15 dB 的 CMRR， $2\times $ 共模抑制比 [dB] +6 dB。