پديد آورنده :
پوراحمد، علي
عنوان :
الكترود فعال مدولاتور جريان دو-سيمه براي ثبت سيار سيگنالهاي حياتي
مقطع تحصيلي :
كارشناسي ارشد
محل تحصيل :
اصفهان: دانشگاه صنعتي اصفهان، دانشكده برق و كامپيوتر
صفحه شمار :
هشت، 78ص.: مصور، جدول، نمودار
يادداشت :
ص.ع. به فارسي و انگليسي
استاد راهنما :
رسول دهقاني
توصيفگر ها :
تقويتكننده حياتي , الكترود خشك , نوار مغز , ولتاژ آفست الكترود , حلقه خودمهار مستقيم , الكترود فعال مدولاتور جريان , شبه‌مقاومت ترانزيستوري , مدار راهانداز پاي راست افزوده ديجيتالي , حذف‌كننده وفقي نويز
استاد داور :
مسعود سيدي، اصغر غلامي
تاريخ ورود اطلاعات :
1396/07/24
رشته تحصيلي :
برق و كامپيوتر
دانشكده :
مهندسي برق و كامپيوتر
چكيده فارسي :
3 2 پيادهسازي به شكل چندپارچه 39 3 3 تحليل مشخصات سيگنال كوچك 19 3 4 سازوكار دفع ولتاژ آفست الكترود 93 3 5 بررسي حالتهاي گذرا و مالحظات شروع كار 33 فصل چهارم تقويتكننده انتهايي و پردازش ديجيتال 45 4 1 مدار حسگر جريان 23 4 2 الكترود مرجع 15 4 3 ريزپردازنده مركزي 65 4 4 مدار راهانداز پاي راست افزوده ديجيتالي 95 4 5 برنامه رابط رايانهاي 15 فصل پنجم دستاوردها و آزمايشهاي تجربي 14 5 1 انتخاب قطعات و طراحي 12 5 2 اندازهگيري مشخصات مداري 62 5 3 ثبت سيگنالهاي حياتي 32 فصل ششم جمعبندي 66 6 1 خالصه و مقايسه نتايج 82 6 2 محدوديتها و پيشنهادها 32 پيوست روش سادهسازي توابع انتقال 96 مراجع 31 چكيده انگليسي 31 هشت
چكيده انگليسي :
Two Wired Current Modulator Active Electrode for Ambulatory Biosignals Recording Ali Pourahmad a pourahmad@ec iut ac ir September 17 2017 Department of Electrical and Computer Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language Farsi Supervisor Dr Rasoul Dehghani dehghani@cc iut ac ir AbstractDry active electrodes AE make biosignal recording more convenient without needingconductive gel or skin preparation compared to conventional wet electrodes Nowadays theapplication of biosignals is being extended outside the health centers as AE based wearablesensors and brain computer interfaces BCI The term active refers to a built inpreamplifier on the electrode that transforms the low amplitude high impedance biosignalsource to an amplified low impedance one therefor improves the signal quality Nevertheless there are also some challenges such as existence of large and time variantelectrode offset CMRR degradation due to the AEs gain mismatch and the flicker noise thatneeds to be dealt with This thesis presents a novel current modulator active electrode CMAE with only two outgoing wires resulting in lower cost and complexity The CMAEis actually an operational transconductance amplifier OTA that modulates the supplycurrent by the input voltage signal through the two supply rails The CMAE prototype isimplemented with only two discrete opamps The ECG and EEG signals are successfullyrecorded by the proposed CMAE with dry electrodes and corresponding total gain of 50 dBand 65 dB and current consumption of 60 A and 100 A The CMAE s built in preamplifieremploys a DC feedback loop instead of conventional DC servo loop DSL which suppressesthe input offset voltage in rail to rail and attenuates the flicker noise at lower frequencies Without using any chopper stabilization the total input referred noise of ECG and EEGCMAEs are 3 9 VRMS and 0 7 VRMS respectively in 0 5 100 Hz bandwidth By usingbipolar pseudoresistors sub hertz low cut off frequency but with fast settling time isattained Since the CMAE performs single ended amplification a digitally boosted drivenright leg DbRL scheme has been designed which typically boosts the gain of the classicDRL by 15 dB in the interest frequency band of 10 250 Hz for more reduction of the body sCM noise Any remaining background CM noise is filtered further using an online adaptivenoise canceler in software to achieve the CMRR of at least 80 dB Keywords Bioamplifier dry electrode electroencephalogram electrode offset voltage DCservo loop current modulator active electrode bipolar pseudoresistor digitally boosteddriven right leg adaptive noise canceler
استاد راهنما :
رسول دهقاني
استاد داور :
مسعود سيدي، اصغر غلامي
