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Ultra Low Power Multistage Current M...

Aslanturk, Cansu,

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Ultra Low Power Multistage Current Mode Logarithmic Amplifier for Fully Implantable Cochlear Implants = = Tamamen Implante Edilebilir Koklear Implantlar Icin Cok Dusuk Guc Tuketimli Cok Kanalli Akim Modlu Logaritmik Yukseltec /

Record Type:	Electronic resources : Monograph/item
Title/Author:	Ultra Low Power Multistage Current Mode Logarithmic Amplifier for Fully Implantable Cochlear Implants =/ Cansu Aslanturk.
Reminder of title:	Tamamen Implante Edilebilir Koklear Implantlar Icin Cok Dusuk Guc Tuketimli Cok Kanalli Akim Modlu Logaritmik Yukseltec /
Author:	Aslanturk, Cansu,
Description:	1 electronic resource (125 pages)
Notes:	Source: Masters Abstracts International, Volume: 86-04.
Contained By:	Masters Abstracts International86-04.
Subject:	Monte Carlo simulation. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=31653712
ISBN:	9798342359665

Ultra Low Power Multistage Current Mode Logarithmic Amplifier for Fully Implantable Cochlear Implants = = Tamamen Implante Edilebilir Koklear Implantlar Icin Cok Dusuk Guc Tuketimli Cok Kanalli Akim Modlu Logaritmik Yukseltec /
Aslanturk, Cansu,

Ultra Low Power Multistage Current Mode Logarithmic Amplifier for Fully Implantable Cochlear Implants =Tamamen Implante Edilebilir Koklear Implantlar Icin Cok Dusuk Guc Tuketimli Cok Kanalli Akim Modlu Logaritmik Yukseltec /Cansu Aslanturk. - 1 electronic resource (125 pages)

Source: Masters Abstracts International, Volume: 86-04.

Cochlear implants (CI) are used for severe to profound hearing losses. Since CIs suffer from damage risk, frequent battery replacement and aesthetic concern, Fully Implantable Cochlear Implants (FICI) are preferred. Due to limitations of FICI sensors, a front end circuitry that can process very low inputs is needed.In this thesis, multistage current mode logarithmic amplifiers (LA) are presented to be used as dynamic range compression and amplification blocks for FICI. MOSFET's subthreshold region operation is combined with parallel amplification parallel summation (PAPS) method so that accurate and process invariant logarithmic behavior can be achieved with wide input dynamic range coverage and ultra-low power dissipation for signals in the nano-micro ampere range. Parasitic extracted (PEX) simulations show that PAPS circuit successfully compresses 40dB input dynamic range to 11.5dB output dynamic range with 2.5µW power dissipation for 20nA-2µA input currents.Channel selective current mode logarithmic amplifier aims to cover daily acoustic band; therefore, channel selection mechanism is implemented which pre-amplifies inputs when they are below certain threshold. This guarantees functionality of subcircuits while increase in power dissipation is minimized. PEX simulation results show that channel selective LA compresses 52dB dynamic range to 13dB for 5nA2µA input currents while dissipating 19.17µW.Both PAPS and channel selective LAs have two versions: externally biased and self biased. Externally biased versions can be used with various sensors while self biased versions eliminate dependency to external source.Presented logarithmic amplifiers are also combined with remaining FICI interface circuit blocks and system compatibility is confirmed.

English

ISBN: 9798342359665Subjects--Topical Terms:

3564916
Monte Carlo simulation.

Ultra Low Power Multistage Current Mode Logarithmic Amplifier for Fully Implantable Cochlear Implants = = Tamamen Implante Edilebilir Koklear Implantlar Icin Cok Dusuk Guc Tuketimli Cok Kanalli Akim Modlu Logaritmik Yukseltec /
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020 $a 9798342359665
035 $a (MiAaPQD)AAI31653712
035 $a (MiAaPQD)MiddleEastTech110077
035 $a AAI31653712
040 $a MiAaPQD $b eng $c MiAaPQD $e rda
100 1 $a Aslanturk, Cansu, $e author. $3 3815418
245 1 0 $a Ultra Low Power Multistage Current Mode Logarithmic Amplifier for Fully Implantable Cochlear Implants = $b Tamamen Implante Edilebilir Koklear Implantlar Icin Cok Dusuk Guc Tuketimli Cok Kanalli Akim Modlu Logaritmik Yukseltec / $c Cansu Aslanturk.
264 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2024
300 $a 1 electronic resource (125 pages)
336 $a text $b txt $2 rdacontent
337 $a computer $b c $2 rdamedia
338 $a online resource $b cr $2 rdacarrier
500 $a Source: Masters Abstracts International, Volume: 86-04.
500 $a Advisors: Kulah, Haluk.
502 $b M.S. $c Middle East Technical University (Turkey) $d 2024.
520 $a Cochlear implants (CI) are used for severe to profound hearing losses. Since CIs suffer from damage risk, frequent battery replacement and aesthetic concern, Fully Implantable Cochlear Implants (FICI) are preferred. Due to limitations of FICI sensors, a front end circuitry that can process very low inputs is needed.In this thesis, multistage current mode logarithmic amplifiers (LA) are presented to be used as dynamic range compression and amplification blocks for FICI. MOSFET's subthreshold region operation is combined with parallel amplification parallel summation (PAPS) method so that accurate and process invariant logarithmic behavior can be achieved with wide input dynamic range coverage and ultra-low power dissipation for signals in the nano-micro ampere range. Parasitic extracted (PEX) simulations show that PAPS circuit successfully compresses 40dB input dynamic range to 11.5dB output dynamic range with 2.5µW power dissipation for 20nA-2µA input currents.Channel selective current mode logarithmic amplifier aims to cover daily acoustic band; therefore, channel selection mechanism is implemented which pre-amplifies inputs when they are below certain threshold. This guarantees functionality of subcircuits while increase in power dissipation is minimized. PEX simulation results show that channel selective LA compresses 52dB dynamic range to 13dB for 5nA2µA input currents while dissipating 19.17µW.Both PAPS and channel selective LAs have two versions: externally biased and self biased. Externally biased versions can be used with various sensors while self biased versions eliminate dependency to external source.Presented logarithmic amplifiers are also combined with remaining FICI interface circuit blocks and system compatibility is confirmed.
520 $a Koklear implantlar (CI), ileri dereceden cok ileri dereceye kadar olan duyma kayiplarinda kullanilir. CI'lar, hasar riski, sik batarya degisimi ve estetik kaygi olusturmalarindan muzdarip oldugundan, Tamamen Implante Edilebilir Koklear Implantlar (FICI) tercih edilir. FICI sensorlerinin limitleri nedeniyle, cok dusuk giris sinyallerini isleyebilen bir on uc devresine ihtiyac vardir.Bu tezde, FICI icin, dinamik aralik sikistirma ve yukseltec blogu olarak kullanilmak uzere cok kanalli akim modlu logaritmik yukseltecler (LA) sunulmustur. MOSFET'in esik alti bolgesinde calismasi, paralel yukseltme paralel toplama (PAPS) yontemiyle birlestirilir, boylece nano-mikro amper araligindaki sinyaller icin genis giris dinamik aralik kapsami ve ultra dusuk guc dagilimi ile dogru ve uretimle degismez logaritmik davranis elde edilebilir. Parazitikleri iceren simulasyonlar, PAPS devresinin basarili bir sekilde 20nA-2µA giris akimlari icin 40dB giris dinamik araligini 11.5dB cikis dinamik araligina 2.5µW guc tuketimiyle basariyla sikistirdigini gostermektedir.Kanal secici akim modlu logaritmik yukseltec, gunluk akustik bandi kapsamayi amaclamaktadir; bu nedenle, girisler belli bir esigin altindayken, on-yukseltme yapan kanal secme mekanizmasi uygulanir. Bu, alt devrelerin islevselligini guc tuketimindeki artis en aza indirilirken garanti eder.Parazitikleri iceren simulasyon sonuclari, kanal secici LA'in, 5nA-2µA giris akimlari icin, 52dB giris dinamik araligini 13dB'ye 19.17µW guc tuketimiyle sikistirdigini gostermektedir. Hem PAPS hem de kanal secici LA'lerin iki versiyonu vardir: harici beslemeli ve kendinden beslemeli. Harici beslemeli versiyonlar farkli sensorlerle kullanilabilinirken kendinden beslemeli versiyonlar harici kaynaga olan bagimliligi ortadan kaldirir.Ayrica, sunulan logaritmik yukseltecler, akim modlu FICI arayuz devresiyle birlestirilmis ve sistem uyumlulugu dogrulanmistir.
546 $a English
590 $a School code: 2013
650 4 $a Monte Carlo simulation. $3 3564916
650 4 $a Transplants & implants. $3 3562683
650 4 $a Input output. $3 3686610
650 4 $a Cochlear implants. $3 822734
650 4 $a Audiology. $3 537237
650 4 $a Surgery. $3 707153
650 4 $a Medicine. $3 641104
690 $a 0300
690 $a 0576
690 $a 0564
710 2 $a Middle East Technical University (Turkey). $b Department of Electrical and Electronics Engineering. $e degree granting institution. $3 3815419
720 1 $a Kulah, Haluk $e degree supervisor.
773 0 $t Masters Abstracts International $g 86-04.
790 $a 2013
791 $a M.S.
792 $a 2024
856 4 0 $u https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=31653712