Marcôndes, D.W.C.; Bertemes-Filho, P.; Paterno, A.S. Current Oscillator Based on Pyragas Model for Electrical Bioimpedance Applications. Electronics2022, 11, 2653.
Marcôndes, D.W.C.; Bertemes-Filho, P.; Paterno, A.S. Current Oscillator Based on Pyragas Model for Electrical Bioimpedance Applications. Electronics 2022, 11, 2653.
Marcôndes, D.W.C.; Bertemes-Filho, P.; Paterno, A.S. Current Oscillator Based on Pyragas Model for Electrical Bioimpedance Applications. Electronics2022, 11, 2653.
Marcôndes, D.W.C.; Bertemes-Filho, P.; Paterno, A.S. Current Oscillator Based on Pyragas Model for Electrical Bioimpedance Applications. Electronics 2022, 11, 2653.
Abstract
Current sources play an essential role in tissue excitation used in bioelectrical impedance spectroscopy. Most investigations use Howland current sources that, despite their practicality and simplified implementation, have operating frequency limitations and dependence on the load impedance due to theirs narrow output impedance, specially at higher frequencies. The objective of this work is to propose model for a robust current-controlled sinusoidal oscillator. The oscillator is based on fully analog electronics, which enables controlling oscillation phase and amplitude by using a voltage reference. The mathematical model is based on Pyragas control application to the classical harmonic oscillator. From the modelling process, it was build an oscillator topology based on second-generation current carriers and on transconductance amplifiers. The reference signal (Fsync) was a sinusoidal voltage source having a frequency of 1MHz and an amplitude of 1Vpp. The oscillator output current synchronized the oscillations’ phase and amplitude with Fsync, regardless of their magnitude before the control signal acted in the circuit at t≈13.5μs. SPICE simulations using ideal components have confirmed the successful operation of the proposed oscillator. This type of oscillator can be implemented in SOIC, then allowing oscillation control interface with logic circuits.
Keywords
Current Oscillator; Pyragas Model; Second-Generation Current Carrier; Bioimpedance Spectroscopy
Subject
Engineering, Electrical and Electronic Engineering
Copyright:
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
