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Domain > www.tazabekov.com
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Date
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2015-08-07
192.64.117.218
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2024-09-12
198.54.116.240
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Port 80
HTTP/1.1 200 OKkeep-alive: timeout5, max100content-type: text/htmllast-modified: Mon, 09 Apr 2018 20:57:02 GMTaccept-ranges: bytescontent-length: 22640date: Thu, 12 Sep 2024 13:38:47 GMTserver: LiteSpeedx-turbo-charged-by: LiteSpeed !DOCTYPE HTML>!-- Miniport by HTML5 UP html5up.net | @n33co Free for personal and commercial use under the CCA 3.0 license (html5up.net/license)-->html> head> title>Olzhas S. Tazabekov/title> meta http-equivcontent-type contenttext/html; charsetutf-8 /> meta namedescription content /> meta namekeywords content /> !--if lte IE 8>script srccss/ie/html5shiv.js>/script>!endif--> script srcjs/jquery.min.js>/script> script srcjs/jquery.scrolly.min.js>/script> script srcjs/skel.min.js>/script> script srcjs/init.js>/script> noscript> link relstylesheet hrefcss/skel.css /> link relstylesheet hrefcss/style.css /> link relstylesheet hrefcss/style-desktop.css /> /noscript> !--if lte IE 8>link relstylesheet hrefcss/ie/v8.css />!endif--> !--if lte IE 9>link relstylesheet hrefcss/ie/v9.css />!endif--> /head> body> !-- Nav --> nav idnav> ul classcontainer> li>a href#top>Top/a>/li> li>a href#profile>Profile/a>/li> li>a href#work>Work/a>/li> !--li>a href#hobby>Hobby/a>/li> --> li>a href#contact>Contacts/a>/li> li>a hrefhttp://blog.tazabekov.com>Blog/a>/li> /ul> /nav> !-- Home --> div classwrapper style1 first> article classcontainer idtop> div classrow> div class4u> span classimage fit>img srcimages/mainAvatar.jpg alt />/span> /div> div class8u> header> h1>Olzhas S. Tazabekov/h1> /header> h2>RF/Analog Integrated Circuit and CMOS-MEMS Designer/h2> p>with an extensive knowledge of designing RF/analog circuits, MEMS-based resonators and microwave components, comprehensive knowledge of digital integrated circuits and RF communication systems. Well versed in communicating, presenting and interpreting technical information./p> p>i>Currently is a Senior RF Design Engineer at Broadcom Limited/i>/p> p>strong>Carreer Goals:/strong> Hands on experience in designing, testing, and analyzing RF modules and components based on both, conventional microwave technologies and MEMS-based resonators. Looking for an engineering position as a part of a professional ambitious and creative team./p> p>strong>My current research/strong> includes micro-electro-mechanical systems (MEMS) for RF applications and smart sensors, which incorporate both silicon integrated circuits and micromechanical structures, as well as micro/nanomachining processes and all those cool small things, which can move, sense, be awesome and make our World better./p> a href#profile classbutton big scrolly>Résumé/a> /div> /div> /article> /div> !-- Profile --> div classwrapper style2> article classcontainer idprofile> h1>Résumé/h1> section classbox style1> h2>Skills/h2> div classrow> div class2u> p>strong>Analog/Mixed Signal Design/strong>/p> /div> div class10u alignjustify> li>Semi/full custom transistor level design of various types of analog blocks, behavioral modeling of circuits, layout design and floor planning, DRC and LVS analysis, FEM electromagnetic analysis, PVT/Monte Carlo verifications, experience with industrial CMOS process (0.35um, 0.18um, 40nm, 28nm),/li> li>System level design and analysis, behavioural modeling using higher levels of abstarctions, specifications and summery of work definition,/li> li>Solid understanding of low power design techniques, analog/digital design, microwave engineering, solid-state and electromagnetic physics, mechanics,/li> li>Hands-on experience with lab characterization equipment, e.g. network analyzers, lock-in amplifiers, oscilloscopes, signal generators;/li> /div> /div> div classrow> div class2u> p>strong>Micro-Electro-Mechanical Systems for RF and Sensors/strong>/p> /div> div class10u alignjustify> li> MEMS design (electrostatically/electrothermally driven actuators and resonators), MEMS layout design (optimization for manufacturing and CMOS compatibility), analytical, finite element and behavioral system level modelling,/li> li> Hands-on experience with post-CMOS MEMS fabrication in a cleanroom and fabrication/characterization equipment (reactive ion etching machine, electron and optical microscopes, doppler laser vibrometer);/li> /div> /div> div classrow> div class2u> p>strong>RF Engineering/strong>/p> /div> div class10u alignjustify> li> RF circuits and passive component desing (e.g. planar microstrip and cavity resonators and filters), EM and circuit simulation, advanced filter design techniques (space mapping, recursuive extraction), solid understanding of microwave theory;/li> /div> /div> div classrow> div class2u> p>strong>Scientific Computing/strong>/p> /div> div class10u alignjustify> li>Computational programming and behaviora modelling with Python, Matlab and Mathematica,/li> li>Solid understanding of object oriented programming, data processing and visualization,/li> li>Hands-on experience with unix-based operating systems and scripting;/li> /div> /div> div classrow> div class2u> p>strong>Software/strong>/p> /div> div class10u alignjustify> li>u>IC/RF EDA Tools:/u> Cadence IC Design suite, Synopsis IC Design suite, Agilent ADS, Xyce, NGspice,/li> li>u>FEM EDA Tools:/u> ANSYS HFSS, Agilent Momentum, COMSOL, Coventor,/li> li>u>Numerical Computing Software:/u> Mathematica, Matlab/Simulink, Mathcad,/li> li>u>PCB EDA Tools:/u> Eagle, Altium Designer,/li> li>u>Programming Languages:/u> Python, VHDL, C++, Pascal, Java, HTML;/li> /div> /div> /section> /article> footer> a href#CVdownload classbutton big scrolly>Download CV/a> a href#work classbutton big scrolly>Areas of Expertise/a> /footer> /div> !-- Work --> div classwrapper style3> article idwork> header> h1>Areas of Expertise/h1> p>/p> /header> div classcontainer> div classrow> div class4u> article classbox style2> a href#mems classimage featured scrolly>img srcimages/cmos.jpg alt/>/a> h3>a href#mems classscrolly>CMOS-MEMS for Sensors and Communications/a>/h3> p>/p> /article> /div> div class4u> article classbox style2> a href#rf classimage featured scrolly>img srcimages/rf.jpg alt />/a> h3>a href#rf classscrolly>RF Engineering for Communication Systems/a>/h3> p>/p> /article> /div> div class4u> article classbox style2> a href#ic classimage featured scrolly>img srcimages/pic03.jpg alt />/a> h3>a href#ic classscrolly>Analog and Digital Circuit Design/a>/h3> p>/p> /article> /div> /div> /div> /article> /div> !-- MEMS --> div classwrapper style2> article classcontainer idmems> header> h1>CMOS-MEMS for Sensors and Communciations/h1> /header> section classbox style1> h2> Why RF Micro-Electro-Mechanical Systems (RF MEMS) ?/h2> div classrow> div class6u alignjustify> p>High frequency mechanical vibrating devices are still widely used in consumer electronics for frequency generation and filtering aplications (e.g. SAW filters and quartz crystals). Compared to active or passive IC elements (e.g. transistors, on-chip capacitors and inductors), mechanical resonators provide higher Quality factors, better linearity and lower power consumption, which is well suited for low-loss on-chip filtering solutions. Continuous size reduction and a possibility of integration with commercially available CMOS IC fabrication process makes RF MEMS technology quite promising for further micro miniaturization of electronics systems./p> span classimage fit>img srcimages/MEMS.jpg alt/>/span> /div> div class6u> div classbox style2> span classimage fit>img srcimages/nathansonRGT.png alt/>/span> h4>Very first MEMS: Resonating gold MOS gate from the 60s H.C. Nathanson et al. The resonant gate transistor,IEEE Trans.Electron Devices,vol. , vol. EDED-14, pp. 117–133, 1967./h4> /div> /div> /div> /section> section classbox style1> h2>Why CMOS-MEMS?/h2> div classrow> div class7u alignjustify> span classimage fit>img srcimages/Why_CMOS_MEMS.jpg alt/>/span> /div> div class5u alignjustify> div classbox style2> span classimage fit>img srcimages/CMOSMEMS.jpg alt/>/span> h4>CMOS MEMS and Analog IC integrated on a single silicon die/h4> /div> /div> /div> /section> section classbox style1> h2>CMOS-MEMS Design Flow/h2> div classrow> div class12u alignjustify> span classimage fit>img srcimages/CMOSMEMS_Design_Flow.jpg alt/>/span> /div> /div> div classrow> div class12u alignjustufy> p>The conventional MEMS design flow consists of several steps: design using analytical and FEM methods, layout drawing, post-processing or fabrication and, finally, testing and characterization./p> /div> /div> div classrow> div class7u alignjustify> p>There are many analytical models built for different types of mechanical resonators (e.g. CC beams, FF beams, disk resonators, lamé resonators, etc.) to predict the critical operational parameters such as resonant frequency, mode shape, maximum deflection, etc. Those are usually used to build initial designs of the MEMS devices that would satisfy the required specs./p> p>However, analytical models are subjected to many simplifications. That is when FEM methods come to help allowing to refine the initial rough designs to better meet the specifications and obtain the operational parameters with higher precision. FEM methods are also irreplaceable when it comes to analyzing complex structures with no luxury of making simplifications./p> p>When the overall dimensions of the mechanical structures are finalized one needs to create a layout of the MEMS devices. The layouts are then used to make lithography masks (in case of full in-house fabrications) or passed to the commercial foundry (in case of CMOS post-processing). /p> /div> div class5u> div classbox style2> span classimage fit>img srcimages/MEMS_FEM.jpg alt/>/span> h4>FEM Simulations of Coupled MEMS Resonators Implementing Band-Pass Filter/h4> /div> /div> /div> div classrow> div class5u> div classbox style2> span classimage fit>img srcimages/MEMS_SEM.jpg alt/>/span> h4>SEM pictures of MEMS mechanical resonators/h4> /div> /div> div class7u alignjustify> p>Quality of the MEMS fabrication or CMOS post-processing might be checked under a Scanning Electron Microscope (SEM), Atomic Force Microscope (AFM) or 3D profilometer./p> p>To make sure that the fabricated MEMS resonator actually moves and its mechanical vibrating properties such as resonance frequency, mode shape and the maximum deflection are the ones that were desired one may need to use a Laser Doppler Vibrometer./p> p>Finally, electrical characterization is usually done using network analyzers, signal generators and oscilloscopes./p> /div> /div> /section> a href#work classbutton big scrolly> Areas of Expertise/a> /article> /div> !--RF--> div classwrapper style2> article classcontainer idrf> header> h1>RF Engineering for Communication Systems/h1> /header> section classbox style1> h2>Passive Microwave Component Design and EM Simulations/h2> p>Including design of passive planar filters (e.g. microstrip, stripline filters), 3D filter design (e.g. cavity, dielectric filters), etc./p> div classrow> div class6u alignjustify> p>Microstrip is a type of electrical transmission line which can be fabricated using printed circuit board (PCB) technology, and used to convey microwave signals. It consists of a conducting strip separated from a ground plane by a dielectric layer known as substrate. Microwave components such as antennas, couplers, filters, power deviders, etc. can be formed using microstrip. The entire device exisitng as metallization pattern on the substrate./p> p>On a smaller scale, microstrip transmission limes are also built into monolithic microwave integrated circuits (MMIC)./p> /div> div class6u> div classbox style2> span classimage fit>img srcimages/microstrip1.jpg alt/>/span> h4>Microstrip circuit/h4> /div> /div> /div> div classrow> div class12u> div classbox style2> span classimage fit>img srcimages/microstrip2.jpg alt/>/span> h4>6-Pole Chebyshev microstrip filter, its equivalent circuit model (ADS) with ideal response and EM simulated response/h4> /div> /div> /div> div classrow> div class7u> div classbox style2> div classimage fit>img srcimages/nonplanar1.jpg alt/>/span> h4>4-Pole Chebyshev filter based on microwave cavity resonator with EM simulated response (top), and its equivalent circuit model (ADS) and ideal response/h4> /div> /div> /div> div class5u alignjustify> p>Microwave resonators and filters can also be constructed from closed sections of waveguides. Because radiation loss from an open-ended waveguide can be significant, waveguide resonators are usually short circuited at both ends, thus forming a closed box, or cavity. A small disc or cube (or other shape) of dielectric material can also be used as a microwave resonator. Dielectric resonators typically use materials with low loss and a high dielectric constant, ensuring that most of the fields will be contained within the dielectric. They are smaller in size, cost and weight when compared to the equivalent metallic cavity, and they can easily be incorporated into microwave integrated circuits and coupled to planar transmission lines./p> /div> /div> /section> section classbox style1> h2>RF circuit and PCB design/h2> div classrow> div class6u> div classbox style2> span classimage fit>img srcimages/rf2.jpg alt/>/span> h4>PCB with implemented negative resistance circuit/h4> /div> /div> div class6u> div classbox style2> span classimage fit>img srcimages/rf1.jpg alt/>/span> h4>Microwave resonator and the loonie ;)/h4> /div> /div> /div> /section> a href#work classbutton big scrolly>Back to Areas of Expertise/a> /article> /div> !-- IC --> div classwrapper style2> article idic> header> h1>Analog and Digital Circuit Design/h1> /header> p>strong>...under construction/strong>/p> a href#work classbutton big scrolly>Back to Areas of Expertise/a> /article> /div> !-- Contacts --> div classwrapper style2> article classcontainer idcontact> header> h1>Contacts/h1> /header> section classbox style1> h2>Yes, lets get in touch!/h2> div classrow> div class12u> /div> /div> div classrow> div class12u> /div> /div> div classrow> div class2u> /div> div class2u alignright> p>strong>Email:/strong>/p> /div> div class8u alignleft> p>strong>Olzhas.Tazabekov(at)gmail(dot)com/strong>/p> /div> /div> div classrow> div class2u> /div> div class2u alignright> p>strong>LinkedIn:/strong>/p> /div> div class8u alignleft> p>strong>a hrefhttps://www.linkedin.com/in/olzhastazabekov>https://www.linkedin.com/in/olzhastazabekov/a>/strong>/p> /div> /div> /section> footer> ul idcopyright> li>© Olzhas S. Tazabekov. All rights reserved./li>li>Design: a hrefhttp://html5up.net>HTML5 UP/a>/li> /ul> /footer> /article> /div> /body>/html>
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