DESIGN AND ANALYSIS OF AN ELECTROCARDIOGRAM AMPLIFIER FOR DIGITAL SIGNAL PROCESSING SYSTEMS

Abstract

The subject of the article is an electrocardiogram (ECG) signal amplifier designed for further processing by a pseudo-differential analog-to-digital converter (ADC) in a computer analysis system of cardiac signals. The purpose of the work is to synthesize an ECG amplifier circuit, calculate its key parameters, and simulate its operation in the LTspice software environment. The article solves the following tasks: determining the nature of noise affecting the ECG signal, calculating the resistor that determines the circuit gain, building the amplifier circuit, and its computer simulation. The following methods are used: simulation modeling of processes and technical devices; mathematical analysis of nonlinear electronic circuits (in particular, circuits based on operational amplifiers); analysis of technical documentation of manufacturers of electronic components; computer simulation modeling of electronic circuits. The following results were obtained: an ECG signal amplification circuit compatible with the pseudodifferential ADC AD4010 was proposed, and the ECG signal amplifier was simulated in the LTspice program. Conclusions: The designed ECG signal amplification circuit allows for the removal of common-mode noise with a frequency of 50 Hz and amplifies the input signal by 826 times. The circuit was simulated in the LTspice software.