An Electronically Tunable Low Power Low Pass Filter Employing Capacitor Multiplier for Biomedical Applications

Yıl 2022, Cilt: 15 Sayı: 3, 845 - 861, 30.12.2022

Deniz Özenli , Ersin Alaybeyoğlu

https://doi.org/10.18185/erzifbed.1127213

Öz

In this work, a novel 0.9nW low pass filter is proposed using 0.18µm TSMC technology in Cadence environment to reject unwanted signals of biomedical applications. Active RC filter is designed with a new capacitor multiplier implementation providing high multiplication factor along with low power consumption. The designed circuit operates with ±0.3V supply voltages with DTMOS technique. At the same time, the power consumption of the proposed circuit is very low that can be implemented in implantable devices. The bandwidth of the designed filter is adjustable between 500mHz and 65Hz. In terms of Figure of Merit, the proposed filter outperforms the recommended circuits in the literature.

Anahtar Kelimeler

Biomedical Applications, Low Pass Filter, Operational Transconductance Amplifier (OTA), Dynamic Threshold MOS (DTMOS)

Biyomedikal Uygulamalar için Kapasite Çarpıcı Kullanan Elektronik Olarak Ayarlanabilen Düşük Güçlü Alçak Geçiren Süzgeç

Öz

Bu çalışmada, biyomedikal uygulamaların istenmeyen işaretleri süzmek için Cadence ortamında 0.18µm TSMC teknolojisi kullanılarak yeni bir 0.9nW düşük geçiş filtresi önerilmiştir. Aktif RC filtresi, düşük güç tüketimi ile birlikte yüksek çarpma faktörü sağlayan ve üç katmalı OTA yapısından oluşan yeni bir kapasite çarpıcı devresi ile tasarlanmıştır. Tasarlanan filtrenin bant genişliği 500mHz ile 65Hz arasında ayarlanabilmektedir. Aynı zamanda önerilen devrenin güç tüketimi taşınabilir cihazlarda uygulanabilecek kadar düşüktür. Önerilen kapasite çarpıcı devresi özellikle güç tüketimi ve çalışma gerilimi açısından literatürde önerilen devrelerden daha yüksek performans göstermektedir.

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