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Related Concept Videos

The Y-to-Delta Circuit01:19

The Y-to-Delta Circuit

A balanced wye-to-delta circuit comprises balanced Y-connected voltage sources and delta-connected loads with no neutral line connection.
The initial step in analyzing a wye-to-delta circuit is to assume a positive phase sequence. These phase voltages are then utilized to calculate the line voltages that occur directly across the delta-connected load impedances. Van, Vbn, and Vcn are the phase voltages in wye, and Vab, Vbc, and Vca are the line voltages for a delta circuit. The relation between...
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In a delta-delta configuration, the source and the load are connected in a delta manner, forming a closed loop that divides the network into three distinct phases. This configuration makes the phase voltages identical to line voltages. Assuming the sources are in positive sequence, the phase voltages can be expressed directly without having a neutral wire.
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Related Experiment Video

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Use of a Foot-Induced Digitally Controlled Resistance Device for Functional Magnetic Resonance Imaging Evaluation in Patients with Foot Paresis
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Published on: July 7, 2023

A digital driven right leg circuit.

Marcelo Haberman1, Enrique Spinelli

  • 1CONICET and UNLP, Dto. Electrotecnia, CC 91 (1900) La Plata, Argentina. marcelo.haberman@ing.unlp.edu.ar

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
PubMed
Summary
This summary is machine-generated.

A new digital Driven Right Leg Circuit (DRL) significantly reduces power line interference by over 80dB. This novel approach enhances common-mode reduction in biosignal acquisition without compromising stability.

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Area of Science:

  • Biomedical Engineering
  • Signal Processing
  • Electronics

Background:

  • Power line interference is a major challenge in biosignal acquisition, particularly in electroencephalography (EEG).
  • Classical analog Driven Right Leg (DRL) circuits offer limited common-mode (CM) reduction, often compromising system stability.
  • Existing DRL circuits struggle to achieve high levels of interference reduction necessary for clean biological signal recording.

Purpose of the Study:

  • To present a novel digital scheme for the Driven Right Leg Circuit (DRL).
  • To achieve ultra-high common-mode (CM) reduction of power line interference while maintaining system stability.
  • To overcome limitations of traditional analog DRL circuits in interference suppression.

Main Methods:

  • Implementation of a digital approach to the DRL circuit.
  • Inclusion of a high Q resonator in parallel with the common-mode amplifier.
  • Utilizing a digital implementation to ensure accuracy and avoid component aging and thermal fluctuations.

Main Results:

  • Achieved ultra-high common-mode reduction of power line interference (higher than 80dB).
  • Improved CM reduction by 40-50dB compared to classical analog DRL circuits.
  • Demonstrated an open-loop gain of 74dB at 50Hz in a laboratory prototype.
  • Successfully tested with real EEG signal acquisition.

Conclusions:

  • The proposed digital DRL scheme offers superior common-mode interference reduction compared to analog counterparts.
  • Digital implementation ensures accuracy, stability, and robustness against environmental factors.
  • This novel DRL circuit is effective for acquiring clean biosignals, such as EEG, in the presence of power line noise.