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Forced Oscillations

Forced Oscillations

When an oscillator is forced with a periodic driving force, the motion may seem chaotic. The motions of such oscillators are known as transients. After the transients die out, the oscillator reaches a steady state, where the motion is periodic, and the displacement is determined.

Oscillations In An LC Circuit

Oscillations In An LC Circuit

An idealized LC circuit of zero resistance can oscillate without any source of emf by shifting the energy stored in the circuit between the electric and magnetic fields. In such an LC circuit, if the capacitor contains a charge q before the switch is closed, then all the energy of the circuit is initially stored in the electric field of the capacitor. This energy is given by

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Purpose
Average SpO2 values are greater than 95%. If the readings fall below 90%, it indicates that...

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Related Experiment Video

Updated: Sep 6, 2025

Evaluation of Respiratory System Mechanics in Mice using the Forced Oscillation Technique

Evaluation of Respiratory System Mechanics in Mice using the Forced Oscillation Technique

Published on: May 15, 2013

Lung Mechanics Tracking With Forced Oscillation Technique (FOT) Based on CMOS Synchronous Demodulation Principle.

Karama M Al-Tamimi, Gregory Begin, Hamed Hanafi Alamdari

IEEE Transactions on Biomedical Circuits and Systems

|June 24, 2022

Summary

This summary is machine-generated.

This study presents an efficient integrated circuit for measuring lung impedance using the Forced Oscillation Technique (FOT). The developed chip enables real-time respiratory mechanics tracking for portable health monitoring.

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Last Updated: Sep 6, 2025

Evaluation of Respiratory System Mechanics in Mice using the Forced Oscillation Technique

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Published on: May 15, 2013

Fabrication and Testing of Microfluidic Optomechanical Oscillators

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Employing the Forced Oscillation Technique for the Assessment of Respiratory Mechanics in Adults

Employing the Forced Oscillation Technique for the Assessment of Respiratory Mechanics in Adults

Published on: February 9, 2022

Area of Science:

Biomedical Engineering
Integrated Circuit Design
Respiratory Physiology

Background:

Lung impedance measurement is crucial for assessing respiratory mechanics.
Existing methods may lack portability or efficiency.
The Forced Oscillation Technique (FOT) offers valuable respiratory data.

Purpose of the Study:

To develop an area-efficient CMOS integrated solution for lung impedance extraction.
To leverage the lock-in principle for selective airway information acquisition.
To enable real-time tracking of respiratory mechanics.

Main Methods:

Utilized the lock-in principle for high bandpass selectivity.
Employed a quadrature voltage commutating passive mixer-first receiver for signal down-conversion.
Designed and fabricated the solution in 0.18µm TSMC technology.

Main Results:

Achieved an active silicon area of 4.7 mm².
Dissipated 429.63 µW of power.
Demonstrated real-time tracking of respiratory mechanics.

Conclusions:

The proposed CMOS integrated solution is area-efficient and power-dissipating.
The system effectively extracts lung impedance using FOT and a novel receiver.
This technology is promising for portable health monitoring and cost-effective biomedical devices.