EEG Sinyallerinin İşlenmesi için İkinci Nesil Akım Kontrollü Akım Taşıyıcı Tabanlı Alçak Geçiren Filtre Tasarımı

Year 2023, Volume: 18 Issue: 2, 405 - 413, 01.09.2023

Kübra Tekin Hasan Güler

https://doi.org/10.55525/tjst.1243178

Abstract

EEG sinyalleri, beyin aktvitesinin analiz edilmesini sağlayan gürültülü sinyallerdir. Son yıllarda, bu sinyallerin analizinde işlemsel yükselteçlerin yerine geniş bant aralığı, yüksek doğrusallık, düşük güç tüketimi gibi birçok avantaj sahip olan akım taşıyıcı tabanlı devrelerin kullanıldığı görülmüştür. Bu çalışmada EEG sinyallerinin analizi için 100 Hz kesim frekansına sahip bir ikinci nesil akım kontrollü akım taşıyıcı (CCCII+) alçak geçiren filtre devresi sunulmuştur. Devrenin benzetimi Orcad pspice programı ile gerçekleştirilmiştir. Ayrıca bu alçak geçiren filtre devresinin uygulama devresi yapılmış ve bazı frekans değerleri için osiloskop görüntüleri elde edilmiştir. Uygulama devresinde akım taşıyıcı olarak AD844 IC kullanılmıştır. CCCII+ alçak geçiren filtre devresine, Bonn Üniversitesinden alınan epilepsi hastası ve normal kişilere ait veriler uygulanmış ve bu sinyallerin frekans bantları incelenmiştir. Bu CCCII+ alçak geçiren filtre devresinin EEG ölçümlerinde kullanılması durumunda epilepsi gibi nörolojik hastalıkların tanısında iyi sonuçlar vereceği öngörülmüştür.

Keywords

Current conveyor, EEG, Active filter, Pspice

Second Generation Current Controlled Current Conveyor Based Low Pass Filter Design For The Processing of EEG Signals

Abstract

EEG signals are noisy signals that allow brain activity to be analyzed. In recent years, it has been seen that current conveyor-based circuits, which have many advantages such as wide bandwidth, high linearity, low power consumption, have been used instead of operational amplifiers in the analysis of these signals. In this study, a second-generation current controlled current conveyor (CCCII+) low pass filter circuit with a cut-off frequency of 100 Hz has been presented for the analysis of EEG signals. The simulation of the circuit was carried out with the Orcad pspice program. In addition, the application circuit of this low-pass filter circuit has been made and oscilloscope images have been obtained for some frequency values. AD844 IC is used as current conveyor in the application circuit. The data of epilepsy patients and normal people taken from the University of Bonn were applied to the CCCII+ low pass filter circuit and the frequency bands of these signals were examined. It has been predicted that if this CCCII+ low pass filter circuit is used in EEG measurements, it will give good results in the diagnosis of neurological diseases such as epilepsy.

Keywords

Current conveyor, EEG, Active filter, Pspice

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