A CCII-BASED HIGH IMPEDANCE INPUT STAGE FOR BIOMEDICAL APPLICATIONS

作者：Ferri Giuseppe^*; Stornelli Vincenzo; Di Simone Alessia

来源：Journal of Circuits, Systems, and Computers, 2011, 20(8): 1441-1447.

DOI：10.1142/S021812661100802X

• Current Conveyor
• ECG
• Znpedance Butstrap

An integrated current mode high impedance input stage designed for Electrocardiography (ECG) systems (or low frequency general applications) is presented. This feature becomes necessary when a two-electrodes ECG apparatus is used (e. g., in fetal ECG or heart monitoring in extreme sports) and a good response of the system to common mode signals is required. The proposed input stage, based on a bootstrap topology that simultaneously increases the ECG electrodes input impedance (from 5 divided by 50 k Omega to about 50M Omega) and amplifies the applied signal, is implemented by using a configuration that employs only two second generation current conveyors for each electrode. Post-layout simulations have proved that the proposed system is quite not sensible to electrodes mismatch and battery discharge.

• 出版日期2011-12