Sohiful Anuar Zainol Murad
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Preferred name
Sohiful Anuar Zainol Murad
Official Name
Sohiful Anuar, Zainol Murad
Alternative Name
Murad, S. A.Zainol
Murad, S. A.Zainol
Anuar, Zainol Murad Sohiful
Zainol Murad, S.A.
Sohiful, Z. M.A.
Main Affiliation
Scopus Author ID
16643180100
Researcher ID
I-1082-2019

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  • Publication
    Dual band low noise amplifier: A review analysis
    ( 2024-02-08)
    Azizan A.
    ;
    Sohiful Anuar Zainol Murad
    ;
    Faizah Abu Bakar
    ;
    Manaf A.A.
    This paper discusses a few earlier efforts in the field of multiband low noise amplifier design (LNA). This study will look at a variety of modern multiband LNA designs, focusing on four topologies: induction matching with notch filter, current reused with cascode, current reused with notch filter, and common source with external capacitor. Each architecture has its own set of benefits and drawbacks. In the future, it will be necessary to strike a balance between tradeoffs, eliminate drawbacks, and achieve optimal multiband LNA performance.
  • Publication
    The analysis of low phase nonlinearity 3.1-6 GHz CMOS power amplifier for UWB system
    ( 2017-01-01)
    Sapawi R.
    ;
    Salleh D.
    ;
    Sahari S.
    ;
    Masra S.
    ;
    Mat D.
    ;
    Kipli K.
    ;
    Sohiful Anuar Zainol Murad
    Low phase nonlinearity is important criteria in power amplifier (PA) especially in ultra-wideband system so that the output will remain original identity. Up to date there is no analysis study have been established in achieving low group delay PA in UWB technology, therefore this paper is to examined the factors that affect low phase nonlinearity in 3.1-6.0 GHz PA using two-stage amplifier with shunt resistive feedback technique for UWB system. The proposed PA adopts two stages amplifier together with inter-stage circuit to obtain adequate flatness of the gain. The shunt resistive feedback topology is used to have very wide input matching. The inductive peaking technique and Class A amplifier is adopted to obtain high gain flatness, low phase nonlinearity and linearity simultaneously. The analysis shows that the dominant factor is identified for low phase nonlinearity in UWB PA. The proposed PA achieves the average gain of 10±1 dB, S11<-6dB, S22< -7 dB, and phase nonlinearity of ±195.5 ps. A good linearity and power consumption are obtained. Therefore, these key performance factors of low phase nonlinearity can be applied to facilitate other researchers working in the area of power amplifier circuit design.
  • Publication
    Pseudo-Differential Transconductor Circuit for a Low Supply Voltage Application
    ( 2021-07-26)
    Mohd Sabari N.D.I.B.
    ;
    Abu Bakar F.B.
    ;
    Azizan A.B.
    ;
    Sohiful Anuar Zainol Murad
    This paper presents a pseudo-differential transconductor circuit. Operational Transconductance Amplifier (OTA) is a standout amongst the most functional and major circuit elements within the analog and mixed-signal circuit style. It is additionally one of the more intricate cells to plan. Due to the rising performance of new generation MOS transistors, the complexity of integrated circuit is continuously increasing with time. The reduction in component sizing is one of the main reasons for integrating millions of transistors into a single chip. There is a great demand for battery powered equipment like a laptop, wireless communication, and implantable devices. In all these devices, it is essential to maintain low power dissipation to achieve good battery life and weight. The main feature of the research is to design a pseudodifferential transconductor circuit for a low supply voltage application with the targeted gain greater than 20 dB using Mentor Graphics software. The designs are done in Pyxis Schematic and Pyxis Layout using eldo platform for simulation to simulate the functionality of the transconductor circuit. From the postlayout simulation, with supply voltage of 1.2 V, the gain of 30 dB with cut-off frequency of 398 kHz has been achieved.
  • Publication
    Design of a low-power CMOS operational amplifier with common-mode feedback for pipeline analog-to-digital converter applications
    ( 2017-01-01)
    Sohiful Anuar Zainol Murad
    ;
    Izatul Syafina Ishak
    ;
    Mohd Fairus Ahmad
    ;
    Shaiful Nizam Mohyar
    This paper proposes a design of a low-power operational ampliér (op-amp) for pipeline analog-to-digital converter (ADC) applications using a 0.13-μm CMOS process. The folded-cascode topology with NMOS input types is employed for the op-amp design due to a larger output gain compared to PMOS input types. Furthermore, the op-amp is designed with a double detection structure of a common-mode feedback circuit to provide stable feedback voltage. The simulation results show that the proposed op-amp achieved a gain of 64.5 dB and a unity gain bandwidth of 695.1 MHz with a low power consumption of 0.14 mW. In addition, by applying ±1.2 V of input voltage, the output voltage generated by the proposed op-amp design remains at 1.2 V with a constant feedback voltage of 1.3 V. Moreover, the proposed circuit was implemented and simulated successfully in a 1.5-bit per stage pipeline ADC.
  • Publication
    Bandwidth enhancement technique with low group delay variation CMOS power amplifier for UWB system
    ( 2017-01-01)
    Rohana Sapawi
    ;
    Siti Kudnie Sahari
    ;
    Dayang Nur Salmi Dharmiza Awang Salleh
    ;
    Dayang Azra Awang Mat
    ;
    Sohiful Anuar Zainol Murad
    This paper introduced a bandwidth enhancement technique for ultra-wideband (UWB) transmitter design with low group delay variation for CMOS power amplifier (PA). Three stages of cascade common source topology are implemented to provide high gain with good gain flatness. Shunt peaking inductor is introduced at every stage of the introduced PA to improve the bandwidth and to achieve low group delay variation simultaneously. A resistive shunt feedback method is implemented at the first stage to acquire good input matching. The first and second stages attain gain at lower corner and upper-end frequency respectively, whilst the third stage smoothed the gain flatness curve. In addition, the theoretical analysis of group delay is investigated to determine the important design factor for low group delay variation in 3.1 to 10.6 GHz CMOS PA for UWB transmitters. The outcome of the research shows that a gain about 11.48 ± 0.6 dB at average, S11 less than -10 dB, and S22 less than -14 dB is achieved. Moreover, excellent group delay variation is acquired throughout the entire band, measuring about ±85.8 ps.
  • Publication
    Modelling on Impact of Building Obstruction for V2I Communication Link in Micro Cellular Environment
    ( 2021-03-01)
    Turner J.S.C.
    ;
    Shahriman Abu Bakar
    ;
    Azizi Harun
    ;
    Sohiful Anuar Zainol Murad
    ;
    Isa M.N.
    ;
    Ismail R.C.
    ;
    Ndzi D.L.
    ;
    Hashim M.S.M.
    ;
    Zuradzman Mohamad Razlan
    ;
    Wan Khairunizam Wan Ahmad
    ;
    Ramli M.F.
    In vehicular communication, signal transmission in vehicle-to-infrastructure (V2I) mode typically takes place on highways, urban, suburban and rural environments. The presence of buildings in these environments poses a challenge to model path loss (PL) due to multiple propagation mechanisms such as diffractions and reflections. However, very little attention has been made to address building effects on the performance of V2I communication links in microcell environment. This paper investigates signal propagation characteristics caused by the impact of building under micro-cellular environment whereby the base station or road-side-unit (RSU) is usually located under the rooftop of building to allow communication between RSU and mobile station or on-board-unit (OBU) on the road. The goal of this paper is to validate and discuss available path loss models based on effect of building obstruction towards RSU-OBU links specifically in residential housing area. The channel measurements are conducted based on static line-of-sight (LOS) settings of a real-world environment at 2.4 GHz frequency band using IEEE 802.15.4 XBee S2C compliant device to measure its receive power. The results are demonstrated based on received signal strength indicator (RSSI) and root mean square error (RMSE). The attenuation profile is validated and compared with suitable path loss models to evaluate best fit and most compatible model based on our measurements data and environment. The analysis shows that several V2I path loss models and V2V channel models are applicable to be used as a reference to model in LOS microcell environment with building obstruction. The finding shows that PL Urban yields the best fit V2I path loss model in terms of RMSE when compared to our measurement campaign at 2.4 GHz.
      2
  • Publication
    Modeling on impact of metal object obstruction in urban environment for internet of things application in vehicular communication
    ( 2020-01-08)
    Turner J.S.C.
    ;
    Azizi Harun
    ;
    Mohd Najib Mohd Yasin
    ;
    Norshamsuri Ali @ Hasim
    ;
    Shahriman Abu Bakar
    ;
    Fadzilla M.A.
    ;
    Sohiful Anuar Zainol Murad
    ;
    Nor Azura Malini Ahmad Hambali
    ;
    Razlan Z.M.
    ;
    Mohd Sani Mohamad Hashim
    ;
    Wan Khairunizam Wan Ahmad
    ;
    Phoon C.Y.
    Objects such as vehicles are considered one of challenging obstruction on the road and very little attention has been made to address its significance on the wireless signal. As such, this paper validates the impact of vehicle obstruction on signal propagation using received signal strength indicator (RSSI) based on the wireless channel measurements of realistic environmental obstruction at 2.4 GHz frequency band. Low mobility IEEE 802.15.4 XBee S2C compliant device which is designed to collect received signal power was used and these devices were deployed at area congested with cars. The channel measurements were conducted on LOS car parking area with two scenarios; single-sided and double-sided vehicle obstruction which mimics the obstruction of metal objects. The effect of existing vehicle on the signal propagation is demonstrated based on RSSI and RMSE. The attenuation profile of vehicular obstruction on wireless signal is modeled and compared with large-scale propagation models. Results show that metal object significantly reduce transmission range and signal power. The findings may incite for future implementation of cooperative deployment program and internet of things (IoT) applications in vehicle-to-infrastructure (V2I) and vehicle-to-vehicle (V2V) communication.
      1
  • Publication
    A very low-dropout voltage regulator in 0.18-μm CMOS technology for power management system
    ( 2020-07-01)
    Sohiful Anuar Zainol Murad
    ;
    Azizi Harun
    ;
    Mohd Nazrin Md Isa
    ;
    Shaiful Nizam Mohyar
    ;
    Karim J.
    A low dropout (LDO) voltage regulator is a type of voltage regulator circuit that works well even when the output voltage is very close to the input voltage, improving its power efficiency. This paper proposes the LDO voltage regulator in 0.18-μm CMOS technology. The proposed LDO regulator consists of voltage reference, symmetrical operational transconductance amplifier (OTA), PMOS transistor, resistive feedback network and output capacitor. The NMOS symmetrical OTA is implemented as an error amplifier and a PMOS transistor is employed as a pass device to improve gain and minimize low dropout voltage, respectively. The proposed design is simulated using Spectre simulator in Cadence software to verify its regulator performance. The simulation results show that the proposed LDO is capable to operate from a supply voltage of 1.7-2.0 V with a low dropout voltage of 19.3 mV at a maximum 50 mA load current to regulate output voltage 1.5 V. The active chip is 2.96 mm2 in size. The performance of the proposed LDO is suitable to enhance power management for system on chip (SoC) applications.
      1
  • Publication
    Design of Internet of Things Based Air Pollution Monitoring System Using ThingSpeak and Blynk Application
    ( 2021-07-26)
    Sohiful Anuar Zainol Murad
    ;
    Faizah Abu Bakar
    ;
    Anishaziela Azizan
    ;
    Shukri M.A.M.
    This paper presents the design of an IoT based air pollution monitoring system to measure carbon dioxide gas, butane gas, humidity and temperature. The hardware consists of MQ-2 gas sensor, ESP8266 Wi-Fi module, DHT22 temperature and humidity sensors. Meanwhile, the software used in this prototype is the Arduino Integrated Development Environment (IDE) written in function C and C++. The monitoring system indicate air quality is below than 100 AQI for safety air quality and more than 200 AQI for hazardous air quality. The green LED illuminated indicates there is no hazardous gas detected. Meantime, when the butane gas or carbon dioxide gas is identified, the red LED is illuminated. All the data are sent through ThingSpeak and Blynk applications. In ThingSpeak and Blynk applications, the data are displayed and updated after detected by the sensors in every 15 seconds and 1 second. In the Blynk application, when the hazardous gas is detected, the Blynk application sends a notification to alert the users immediately.
      1
  • Publication
    Analog & RF circuits: design & implementation
    ( 2019)
    Sohiful Anuar Zainol Murad
    ;
    Jamilah Karim
    ;
    Noor'ain Kamsani
    ;
    Azizi Harun
    This book entitled ANALOG AND RF CIRCUITS Design and Implementation intentionally covers both analog and radio frequency circuits design and optimization approaches, which is the key feature that distinguishes it from other existing books. It focuses on the theoretical aspects of various designs and simulation and measurement for analog and RF integrated circuits and systems. The book also highlights the unique design issues, which facilitates the reader to understand more advanced research at a good pace. Furthermore, each chapter and subject’s area begins with basic principles and fundamentals and goes into further detail with selected design examples with in-depth discussions and up-to-date references. Read this book to learn more about the design techniques for realizing analog and RF circuits. This book is a comprehensive reference and well-founded material for students as well as electronics engineers and researchers in academia and industry working in the areas of circuits and systems design.
      7  361