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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Low noise figure 2.4 GHz down conversion CMOS mixer for wireless sensor network application

2017-01-06 , Sohiful Anuar Zainol Murad , Shaiful Nizam Mohyar , Azizi Harun , Mohd Najib Mohd Yasin , Izatul Syafina Ishak , Rohana Sapawi

This work proposed a low noise figure 2.4 GHz down-conversion CMOS mixer for wireless sensor network (WSN) application using 0.13-μm Silterra technology. The proposed down-conversion mixer converts a high radio frequency (RF) signal from 2.4 GHz to an intermediate frequency (IF) of 100 MHz through the use of a local oscillator signal (LO) of 2.3 GHz. The proposed mixer employs a double balance Gilbert-cell topology with integrated input matching at the input stage and a low pass filter at the IF stage. The simulation results indicate that the proposed mixer obtains lower noise figure (NF) of 5.21 dB with an input third-order intercept point (IIP3) of 0 dB. Furthermore, the conversion gain (CG) of 8.6 dB is achieved with the power consumption of 1.57 mW at 1.8 V supply voltage.

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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.

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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.

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Development of Soil Electrical Conductivity (EC) Sensing System in Paddy Field

2021-03-01 , Othaman N.N.C. , Mohd Nazrin Md Isa , Razaidi Hussin , Rizalafande Che Ismail , Siti Zarina Md Naziri , Sohiful Anuar Zainol Murad , Azizi Harun , Muhammad Imran Ahmad

The amount of fertilisers affects electrical conductivity (EC), and it is one of the major causes of the paddy yield decrease. The overuse of fertilisers can lead to environmental pollution and contamination. This study designed to develop soil electrical conductivity (EC) sensing system in the paddy field using the smart farming application. In this work, the study conducted in Kampung Ladang, Kuala Perlis, and the soil samples collected from a random location at two different depths from the paddy field. The EC value for the developed system was near the calibration solutions (12880µS and 150000µS) and directly proportional to the temperature. From the laboratory soil results, the EC values of the soils were higher with fertiliser. However, the EC values for 0-10cm soil depth were higher than 10-20cm soil depth. The soil EC is inversely proportional to the depth of soil and directly proportional to the amount of nutrients. It observed that the soil EC is linearly related to the amount of nutrients and temperature. The EC value decreases with the increase of soil depth displays a low amount of salts in the deep soil, while, increases with the increase of temperature indicates high current flow.

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A 0.89 to 2.1 GHz Tunable Power Amplifier for Multi-band Transmitter

2023-01-01 , Sapawi R. , Kipli K. , Julai N. , Hong Ping K. , Sohiful Anuar Zainol Murad , Awg Salleh D.N.S.

This paper presents a multi-band power amplifier by using Benzocyclobutene inductor and tunable barium strontium titanate capacitor to achieve high quality (Q) factor to improve narrow bandwidth in tunable of power amplifier. The proposed power amplifier employed two stages with resistive shunt feedback at the input stage to provide a broadband gain and steady wideband input matching. Tunable frequency range from 0.89 GHz to 2.1 GHz is conducted by tunable BST capacitor from 1 pF to 20 pF. The tunable power amplifier achieves high power gain, good input and output matching, low power consumption and good power added efficiency over all frequency range of interest. It can be concluded that the proposed multi-band power amplifier is quite promising for future mobile terminals application.

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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.

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High linearity multi-band CMOS low noise amplifier at 2.4/3.5 GHz for 4G/5G applications

2024-02-08 , Sohiful Anuar Zainol Murad , Azizan A. , Faizah Abu Bakar , Ahmad Fariz Hasan , Marzuki A. , Zulkifli T.Z.A.

This paper presents a high linearity multi-band CMOS low noise amplifier (LNA) at 2.4/3.5 GHz for wireless application. The proposed multi-band CMOS LNA is targeted for concurrent 2.4 GHz and 3.5 GHz bands for 4G and 5G wireless technology, respectively. A cascoded topology with bandpass and bandstop filter at the input is utilized to achieve multiple-band frequency at 2.4 GHz and 3.5 GHz. The LNA is implemented and simulated using CMOS 0.13 μm process in Cadence Virtuoso Analog Design Environment software. The simulation results indicate that the gain (S21) of 15 dB/11 dB with the third order intercept point (IIP3) of 2.04 dBm/3.80 dBm at 2.4 GHz/3.5 GHz frequencies are achieved. Meanwhile, the noise figure of 3.0 dB/3.6 dB is obtained with the power consumption of 35.1 mW at 1.0 V supply voltage. The total chip area is 2.61 mm2

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Design of High-Quality Factor Active Indictor Using CMOS 0.18-μm Technology for 5G Applications

2022-01-01 , Ali H.A.A.A. , Sohiful Anuar Zainol Murad , Hasan A.F. , Faizah Abu Bakar , Sapawi R.

This paper presents high quality factor of active inductor circuit for 5G application. The proposed circuit is based on the differential active inductor (DAI) topology. The DAI is designed using CMOS 0.18 μm technology. The quality factor (Q) can be tuned with the current source values, ranging from 0.5 mA to 3 mA, while the voltage can control the inductance values L. Meanwhile, the frequency range can be controlled with the feedback resistance. The simulation results indicate that the Q factor as large as 262.5k can be achieved with inductor values of 10 nH at frequency 3.2 GHz. In addition, the Q factor of 1650 is obtained at 3.5 GHz. The performance comparison with previously published works is also demonstrated and found that the proposed DAI is suitable for 5G application.

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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.

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The production of Malaysia bamboo charcoal (Gigantochloa albociliata) as the potential absorbent

2017-09-26 , Siti Salwa Mat Isa , Muhammad M. Ramli , Nor Azura Malini Ahmad Hambali , Mohd. Mustafa Al Bakri Abdullah , Sohiful Anuar Zainol Murad

Bamboo charcoal was successfully carbonized at 500 °C and 800 °C using Malaysia buluh madu (Gigantochloa albociliata). Structural analysis was done using Atomic Force Microscopy (AFM) in two different solvents; ethanol and DI water. The functional groups of bamboo charcoal were confirmed using Fourier Transform Infrared Spectroscopy (FTIR). The adsorption property of bamboo charcoal solution was investigated at different concentrations of 0.2, 0.4 and 0.7 mg/mL, using methylene blue test and characterized using UV-Vis Spectroscopy. Based on the adsorption investigation, it shows that the adsorption was increased as the concentration increased. It was also shown that at higher temperature and longer duration time, the adsorption process is improved.

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