TAMAMEN OPTİK MİKROSİSTEMLER İÇİN 180NM CMOS TEKNOLOJİSİNDE TASARLANMIŞ DÜŞÜK GERİLİM BESLEMELİ OSİLATÖRLERİN KARŞILAŞTIRILMASI

Bu çalışmada tamamen optik entegre bir biyomedikal sistem için düşük güç tüketimine ve düşük besleme gerilimine sahip üç temel osilatör bazlı kapasitif ve dirençsel algılama devre yapısı incelenmiş ve bu devreler güç tüketimi, çalışma besleme gerilimi ve çıkış frekansı değerleri göz önüne alınarak karşılaştırılmıştır. Osilatör temelli algılama devrelerinde kullanılan elemanların değerleri 180 nm CMOS (Complementary Metal Oxide Semiconductor - Tamamlayıcı Metal Oksit Yarı İletken) Teknolojisine göre hesaplanmış ve benzetimleri gerçekleştirilmiştir. Ayrıca çıkış frekansının algılayıcı direnç ve kapasite değerine bağlı teorik eşitlikleri türetilmiştir. Halka osilatör devresi ile 0,5 V besleme geriliminde başarılı sonuçlar alınmış ve bu algılayıcının gerilim yükseltici devreler kullanımına ihtiyaç duymadan tek bir tümleşik CMOS fotodiyot ile çalışabilirliği gösterilmiştir.

COMPARISON LOW VOLTAGE OSCILLATORS IN 180NM CMOS TECHNOLOGY FOR ALL-OPTICAL MICROSYSTEMS

In this work, the design and results of three oscillator-based capacitive and resistive sensing circuits with low supply voltage and low power consumption for an optically powered biomedical microsystem are investigated. The oscillator-based sensing circuits are designed and simulated using 180 nm CMOS Technology. In addition, the theoretical relationships of output frequency depending on sensor resistance and capacitance are derived. Moreover, it is also shown that the ring oscillator can work at 0.5 V supply voltage and it can be operated with a single integrated CMOS photodiode without utilizing a voltage doubler circuit.

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