Arjuna Marzuki

Antenna in LTCC Technologies: A Review and the Current State of the Art

This paper presents a chronological review of the research carried out on antennas in low-temperature cofired ceramics (LTCC) technology over the last ten years or so. Major breakthroughs in LTCC technologies and its shortcomings are highlighted. The current state of the art of LTCC-technology-based antennas is then evaluated. All realizable features of the LTCC-based antennas, which are compact and of light weight and offer high-speed functionality for portable electronic devices, are illustrated. Different techniques used by researchers for broadbanding, multiband designs, and fabrication of LTCC-based antennas are also presented. This paper ends with some recommendations and concluding remarks.

Broadband RF feedback amplifier design with simple feedback network

The paper presents a simple and fast design technique for an RF feedback amplifier. The amplifier uses a series resistor and capacitor as the feedback element. An overview of the amplifier impedance analysis and the noise theory of the amplifier is presented. A high frequency passive component model is also presented. With a current consumption of 6 mA, the simulated amplifier features a noise figure of 2.4 dB and an S/sub 21/ of 14.7 dB at 2 GHz. It achieves a very flat S/sub 21/ over 50 MHz to 2.5 GHz.

A 1.5 V, 0.85-13.35 GHZ MMIC Low Noise Amplifier Design Using Optimization Technique

Abstract This paper describes how a broadband, 1.5 V, 0.85 − 13.35 GHz low noise amplifier in 0.15 ¼m 85 GHz PHEMT process is synthesized to simultaneously meet multiple design specifications such as bandwidth, noise Figure, power gain and power consumption. Power-constrained synthesis technique is used to design the broadband amplifier. The simulated peak S21 is 19.8 dB, maximum noise Figure is 2.5 dB, 3-dB bandwidth is 12.5 GHz and power consumption is 73.5 mW. The calculated Figure of merit (FOM) is better than many reported broadband low noise amplifier (LNA).

Study of fuzzy systems with Sugeno and Mamdanitype fuzzy inference systems for determination of heartbeat cases on Electrocardiogram (ECG) signals

This paper discusses the suitability of implementing Sugeno- and Mamdani-type FISs for heartbeat case determination based on the Electrocardiogram (ECG) signals. The heartbeat cases are Normal Sinus Rhythm (NORM), Left Bundle Branch Block (LBBB), Right Bundle Branch Block (RBBB), Ventricular Premature Contractions (VPC) and Atrial Premature Contractions (APC). Overall, fuzzy system with Sugeno-type FIS was developed based on the FL method used in a paper. System modifications were carried out to create an alternative system for the application, implemented using Mamdani-type FIS. Both systems were verified with 3000 sets of random data for systems’ performance comparison. Sugeno’s system sensitivities in determining each heartbeat case are 100%, which leads to a TCA value of 100%, whereas in Mamdani’s system, the sensitivities are all 100%, except for NORM heartbeat case which is 99.8% and thus TCA value is 99.9667%. It is also found that the Sugeno’s system processing time is always less compared to Mamd...

A Multi-resolution GA-PSO Layered Encoding Cascade Optimization Model

Many real-world problems involve optimization of multi-resolution parameters. In optimization problems, the higher the resolution, the larger the search space, and resolution affects the accuracy and performance of an optimization model. This article presents a genetic algorithm and particle swarm based cascade multi-resolution optimization model, and it is known as GA-PSO LECO. GA and PSO are combined in this research to integrate random as well as directional search to promote global exploration and local exploitation of solutions. The model is developed using the layered encoding representation structure, and is evaluated using two parameter optimization problems, i.e., the Tennessee Eastman chemical process optimization and the MMIC amplifier design interactive optimization.

Uncertainty in Interval Type 2 Fuzzy Systems

This paper studies uncertainty and its effect on system response displacement. The paper also describes how IT2MFs (interval type-2 membership functions) differentiate from T1MFs (type-1 membership functions) by adding uncertainty. The effect of uncertainty is modeled clearly by introducing a technique that describes how uncertainty causes membership degree reduction and changing the fuzzy word meanings in fuzzy logic controllers (FLCs). Several criteria are discussed for the measurement of the imbalance rate of internal uncertainty and its effect on system behavior. Uncertainty removal is introduced to observe the effect of uncertainty on the output. The theorem of uncertainty avoidance is presented for describing the role of uncertainty in interval type-2 fuzzy systems (IT2FSs). Another objective of this paper is to derive a novel uncertainty measure for IT2MFs with lower complexity and clearer presentation. Finally, for proving the affectivity of novel interpretation of uncertainty in IT2FSs, several investigations are done.

Horizontal and Vertical Rule Bases Method in Fuzzy Controllers

Concept of horizontal and vertical rule bases is introduced. Using this method enables the designers to look for main behaviors of system and describes them with greater approximations. The rules which describe the system in first stage are called horizontal rule base. In the second stage, the designer modulates the obtained surface by describing needed changes on first surface for handling real behaviors of system. The rules used in the second stage are called vertical rule base. Horizontal and vertical rule bases method has a great roll in easing of extracting the optimum control surface by using too lesser rules than traditional fuzzy systems. This research involves with control of a system with high nonlinearity and in difficulty to model it with classical methods. As a case study for testing proposed method in real condition, the designed controller is applied to steaming room with uncertain data and variable parameters. A comparison between PID and traditional fuzzy counterpart and our proposed system shows that our proposed system outperforms PID and traditional fuzzy systems in point of view of number of valve switching and better surface following. The evaluations have done both with model simulation and DSP implementation.

Advances in Monolithic Microwave Integrated Circuits for Wireless Systems: Modeling and Design Technologies

Arjuna Marzuki obtained his B.Eng (Hon) in Electronic (Com) from the Department of Electronic & Electrical Engineering at the University of Sheffield in United Kingdom, MSc from Universiti Sains Malaysia and PhD from Universiti Malaysia Perlis. He co-founded C-RAD Technologies () in year 2005 and remains as technical consultant with the company. Since 2006, Arjuna has joined School of Electrical and Electronic Engineering, Universiti Sains Malaysia as a lecturer. He teaches analog circuit design and integrated circuit design. He is also an associate research fellow with Collaborative μElectronic Design Excellence Centre (CEDEC), USM. Arjuna has gained professional qualification as professional engineer when he was elected to the Register of The Society of Professional Engineers, SPE(UK) (http://www.professionalengineers-uk.org). He is also a corporate member of Institute of Engineering and Technology (IET)MIET, a fellow of The International Institute of Engineers (IIE), a senior member of International Association of Computer Science & Information Technology (IACSIT). Arjuna has to-date filed 4 international patents and published more than 20 technical papers. He has developed more than 20 commercial products during his employment with Hewlett-Packard/Agilent Technologies and IC Microsystems. Arjuna Marzuki (Universiti Sains Malaysia, Malaysia), Ahmad Ismat Abdul Rahim (Telekom Malaysia R&D, Malaysia) and Mourad Loulou (Group EleCom of LETI Laboratory, Tunisia)

A 2.4 GHz packaged power amplifier using GaAs PHEMT technology

This paper describes the design and measured performance of Monolithic Microwave Integrated Circuit (MMIC) power amplifier for wireless LAN applications in the 2.4GHz band. The power amplifier (PA) is designed using 0.15μm GaAs power PHEMT technology. The die size of this PA is 1.2mm × 0.7mm and this PA is also offered in 16-pin QFN package. With only 3.0 V of drain voltage (VDS), the packaged PA exhibits an output power at 1dB gain compression (P1dB) of 14.01 dBm, Power-Added Efficiency (PAE) of 31.70% and gain of 7.51 dB, respectively. The maximum current, Imax of this packaged amplifier is 77.90mA and the power consumption for the device is 233.70mW.

Characterization of on-wafer RF passive components for RFIC devices using three-steps de-embedding method

This paper demonstrates the process of characterizing on-wafer RF components for RFIC devices by using a three-steps de-embedding method. Three RF passive components are used for this purpose: spiral inductor, metal-finger capacitor and silicide-block N-poly resistor. The DUTs together with their calibration structure was fabricated in 0.13 µm CMOS technology. Comparisons between the simulated data, raw measured data and de-embedded data were made in order to see the accuracy of the de-embedding method.