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A Study of Ferroelectric Properties of the Oscillator Model of PZT-22
Ikechi Augustine Ukaegbu,Vladimir Nikolaevich Borodulin 한국전자통신연구원 2011 ETRI Journal Vol.33 No.1
In this letter, we study the contemporary technologies for making ferroelectric films and the possibility of using the oscillator model of PZT-22 to analyze its ferroelectric properties. The material showed permittivity dispersion at 65 KHz and 88.5 KHz. We obtained relative attenuation γ, relaxation time τ, and max of the material as 0.0008319, 0.5 s, and 603.438, respectively.
Jamshid Sangirov,Ikechi Augustine Ukaegbu,Tae-Woo Lee,Mu Hee Cho,박효훈 한국전자통신연구원 2012 ETRI Journal Vol.34 No.1
A video signal through a high-density optical link has been demonstrated to show the reliability of optical link for high- data-rate transmission. To reduce optical point-to-point links, an electrical link has been utilized for control and clock signaling. The latency and flicker with background noise occurred during the transferring of data across the optical link due to electrical-to-optical with optical-to-electrical conversions. The proposed synchronization technology combined with a flicker and denoising algorithm has given good results and can be applied in high-definition serial data interface (HD-SDI), ultra-HD-SDI, and HD multimedia interface transmission system applications.
10 Gbps Transimpedance Amplifier-Receiver for Optical Interconnects
Jamshid Sangirov,이태우,박효훈,Ikechi Augustine Ukaegbu,조무희 한국광학회 2013 Current Optics and Photonics Vol.17 No.1
A transimpedance amplifier (TIA)-optical receiver (Rx) using two intersecting active feedback system with regulated-cascode (RGC) input stage has been designed and implemented for optical interconnects. The optical TIA-Rx chip is designed in a 0.13 μm CMOS technology and works up to 10 Gbps data rate. The TIA-Rx chip core occupies an area of 0.051 mm2 with power consumption of 16.9 mW at 1.3V. The measured input-referred noise of optical TIA-Rx is 20 pA/√Hz with a 3-dB bandwidth of 6.9 GHz. The proposed TIA-Rx achieved a high gain-bandwidth product per DC power figure of merit of 408 GHzΩ/mW.
40 Gb/s optical subassembly module for a multi-channel bidirectional optical link
Sangirov, Jamshid,Joo, Gwan-Chong,Choi, Jae-Shik,Kim, Do-Hoon,Yoo, Byueng-Su,Ukaegbu, Ikechi Augustine,Nga, Nguyen T. H.,Kim, Jong-Hun,Lee, Tae-Woo,Cho, Mu Hee,Park, Hyo-Hoon The Optical Society 2014 Optics express Vol.22 No.2