Ruhaifi Abdullah Zawawi

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This paper reviews low power AC-DC converter in different techniques capable of developing high efficiency of energy consumption in many applications. By using low power AC-DC converter, the size of whole system integrated circuit could be reduced. However, the requirements of CMOS converter that required low input voltage and low voltage drop of MOS(More)
This paper proposes a modeling of low-power CMOS transistors, which are suitable for AC-DC converter applications. First section described DC analysis of input and output device of CMOS transistor using Spectre simulation tool from Cadence Design Systems. After that, advanced CMOS transistors have been applied onto development of low-voltage CMOS AC-DC(More)
The current paper presents an improved bandgap voltage reference (BGR) that utilizes curvature-corrected current generators which compensate for the voltage reference at lower and higher temperature range. The voltage reference is operated with a supply voltage of 2.5V to achieve an output reference of 1.1835V. The temperature coefficient achieved from the(More)
A new CMOS bandgap voltage reference (BGR) is proposed and simulated using Silterra 0.13 μm CMOS technology. The proposed BGR utilizes 3 curvature-corrected current generators that compensate for the output voltage variation in an extended temperature range. The proposed circuit generates an output voltage of 1.181 V with a variation of 380 μV from !50 °C(More)
This paper presents the study on the effect of different widths in CMOS rectifier for low voltage and frequency application. The model is powered by 1V peak voltage of AC supply with frequency of 50Hz. This low frequency is used in this paper to match with the supply frequency from the power plant. The design is based on the CMOS 0.18um technology. The(More)
In the current paper, an improvement of piecewise curvature-corrected CMOS bandgap reference (BGR) circuit is proposed. The circuit utilizes piecewise nonlinear curvature-corrected current (PNCCC) in a conventional BGR with a current control circuit, which compensates for the voltage reference at a higher temperature range. The current control circuit (CCC)(More)
In this paper, CMOS based Voltage Controlled Oscillator (VCO) with frequency stability feature was developed. Current compensation circuit design is proposed and simulated together with VCO to produce selected output frequency at approximately 27 MHz. The design was realized using Silterra 0.18um process technology. Compensation circuit was aimed to control(More)
The conventional Short-Open-Load-Thru (SOLT) calibration technique and measurement problem in microwave devices are investigated in this paper. Tremendous development in mobile communication increases the demand for accuracy and performance characterizations of wireless devices over a range of frequencies. Due to this fact, simplified version of calibration(More)
This paper presents a new CMOS Bandgap Voltage Reference (BGR). The proposed circuit consists of first-order BGR and a curvature correction circuit utilizing current sink technique to compensate for the voltage reference in a wide temperature range. With a supply voltage of 2.5 V, the simulated result shows the temperature coefficient of 2.75 ppm/°C is(More)
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