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    A Microwave Ring Resonator Based Glucose Sensor
    (Elsevier Science Bv, 2016) Camli, Berk; Kusakci, Emre; Lafci, Berkan; Salman, Seyhan; Torun, Hamdi; Yalcinkaya, Arda
    A microwave ring resonator based glucose detecting biosensor incorporating glucose oxidase enzyme is presented. Sensor uses a split ring resonator as a transducer, where the sensing operation is done by the observation of shifts in its resonant frequency. Resonator was fabricated with basic fabrication techniques and the enzyme was immobilized via conductive polymer agent PEDOT: PSS. Experimentally observed redshift of resonant frequency of the sensor in response to different loading conditions are in agreement with simulation results and theoretical expectations. Sensor selectivity is confirmed with control experiments conducted with NaCl solutions. Experiments done with different glucose solution concentrations yielded a sensor sensitivity of 0.174MHz/mgml(-1). (C) 2016 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license.
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    An Optoelectrical, Standard CMOS-Based Active Catheter Tracking System for MRI
    (Elsevier Science Bv, 2014) Camli, Berk; Sarioglu, Baykal; Yalcinkaya, Arda D.
    A fully optical active catheter tracking system compatible with 3T MRI environment is presented. It replaces conducting cables with optical fibers to reduce RF-induced heating problem. Proposed system consists of a MEMS-based microstructure array and an IC driving it. The IC houses an RF receiver block and an optoelectrical power supply. A prototype IC was fabricated in UMC 0.18 mu m CMOS process. Measurements indicate that the supply unit is able to provide 2.18mA at 1.2V supply, when a laser beam of 80mW power at its source is applied to IC. The system is operational at laser source power levels above 40mW. (C) 2014 The Authors. Published by Elsevier Ltd.
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    Photodiodes for Monolithic CMOS Circuit Applications
    (IEEE-Inst Electrical Electronics Engineers Inc, 2014) Camli, Berk; Sarioglu, Baykal; Yalcinkaya, Arda D.
    An optoelectrical power supply unit compatible with standard CMOS processes designed for microscale applications is presented. The system is based on an earlier version consisting of a photodiode that converts optical power to electrical power, and a dc/dc converter that increases the photodiode anode voltage to desirable levels. It has the ability to operate continuously or intermittently. The latter operation mode employs additional system elements and requires the modulation of the input laser beam. A prototype was fabricated in UMC 0.18-mu m triple-well standard CMOS process along with a direct conversion self-mixing receiver block on a die of 1525 mu m x 1525 mu m area. Performance measurements were done using a laser source of 650-nm wavelength at different power levels. For an input laser power of 80 mW, the source can provide an output current of 2.18 mA at a supply voltage of 1.2 V. The proposed system can be used to power integrated digital and low-power analog communication and medical microsystems.