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Instrumentation Amplifier

Instrumentation Amplifier

An electrocardiography (ECG) machine is an essential piece of medical equipment used to monitor the electrical activity of the heart. It operates by detecting small electrical changes on the skin that result from the depolarization of the heart muscle during each heartbeat. However, these signals are in the microvolt range and can be easily overwhelmed by noise or interference.
To overcome this challenge, an ECG machine utilizes an instrumentation amplifier. This specialized amplifier is...

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Pulse rhythm refers to the pattern of pulsations within specific intervals, offering valuable insights into the regularity or irregularity of the heart's beats as observed through the pattern of pulsation within specific intervals. A regular pulse exhibits a consistent heart rate with uniform waveforms and pulsation force, variations of which can be classified as normal, weak, or bounding.
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Related Experiment Video

Updated: Jun 6, 2026

Real-Time Cardiac Mapping with a Noninvasive Imageless Electrocardiographic Imaging System

Real-Time Cardiac Mapping with a Noninvasive Imageless Electrocardiographic Imaging System

Published on: April 11, 2025

A low-power asynchronous ECG acquisition system in CMOS technology.

Sungkil Hwang¹, Michael Trakimas, Sameer Sonkusale

¹Nanoscale Integrated Sensors and Circuits Laboratory, Tufts University, Medford, MA 02155, USA.

Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference

|November 25, 2010

Summary

This study presents an asynchronous electrocardiogram (ECG) system for wearable monitoring. Its unique design offers data compression and low power consumption, ideal for compact devices.

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Area of Science:

Biomedical Engineering
Wearable Technology
Signal Processing

Background:

Wearable ambulatory monitoring requires efficient and compact electrocardiogram (ECG) acquisition systems.
Existing systems often face challenges with power consumption and data management for continuous monitoring.

Purpose of the Study:

To develop an asynchronous ECG acquisition system for wearable ambulatory monitoring.
To achieve inherent data compression and low power consumption for compact applications.

Main Methods:

Designed a system with a low-noise front-end amplifier (AFE), asynchronous analog-to-digital converter (ADC), and digital signal processing (DSP).
Utilized an asynchronous architecture with a signal-dependent sampling rate for data compression.
Fabricated the AFE and ADC using 0.18 microm CMOS technology.

Main Results:

The system demonstrates effective ECG monitoring capabilities.
Achieved inherent data compression due to the asynchronous sampling rate.
The fabricated AFE and ADC consume a total of 79 microwatts (μW).

Conclusions:

The asynchronous ECG acquisition system is suitable for compact wearable monitoring.
The low power consumption and data compression features make it attractive for ambulatory applications.
The presented system offers a promising solution for next-generation wearable health devices.