Wyniki 1-3 spośród 3 dla zapytania: authorDesc:"Hafizah HUSAIN"

Performance Analysis of Bluetooth Zigbee and Wi-Fi Protocols in 2.4 GHz Multi-standard Zero-IF Receiver

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This paper presents a system-level modeling of a multi-standard receiver, which satisfies Bluetooth, Zigbee and Wi-Fi protocols. An analysis of different wireless receivers suited for multi-standard purposes is performed. The multi-standard Zero-IF receiver was modelled and simulated in MATLAB/SIMULINK environment. The simulation result exhibits better performance of multi-standard wireless receiver for these three protocols. The signal spectrum is verified by simulation model through the receiver for each standard and concluded that Zero-IF is the adequate topology for multi-standard receivers. Streszczenie. Przedstawiono odbiornik pracujący w wielu standardach - ZigBee, Bluetoot i WiFi. Modelowano taki odbiornik i symulowano. Stwierdzono że odbiornik typu zero IF ma najlepsza topologię dla pracy wielostandardowej. (Analiza właściwości odbiornika typu zero IF pracującego przy częstotliwości 2.4 GHz w różnych standardach) Keywords: Multi-standard, Zero-IF receiver, RF front-end. Słowa kluczowe: odbiornik, Zigbee, WiFi, Bluetoot. Introduction With the significant growth of wireless communication, challenges are continuously being posed on enabling technologies to handle requirements that are more demanding. Communication systems organize to simplify communication between one or more devices, according to a pre-determined signaling process. The signaling processes often conform to a standard, whether the standard is proprietary or determined by an industry consortium. For example, wireless communication systems involve communication between a base station and a mobile unit through radio frequency (RF) transmission. The baseband section in a receiver receives baseband analog signals and performs subsequent processing before generating digital output. Analog signals coming into the baseband receiver usually undergo a filtering operation to attenuate unwanted frequencies or noise, followed by an analog-to-digital conversion (ADC) [1].[...]

Evolution of IC Switching Voltage Regulator DOI:10.15199/48.2015.10.31

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To satisfy the fast voltage regulation and low input harmonic current distortion, a voltage regulator and a power factor correction (PFC) pre-regulator need to be existed. Cascading the voltage regulator with the PFC pre-regulator is the simplest way to implement the switching voltage regulator. The voltage regulator and PFC pre-regulator is processed the input power for switching regulator serially. The switching regulators efficiency has confirmed deteriorate. The requirement of the harmonic emission has been satisfied by the various types of the non-cascading PFC switching regulators. In this paper, the evolution of the switching regulator and various types of the non-cascading PFC switching regulator is discussed and the design of implementation of different output power levels for two types of non-cascading PFC switching regulator is presented. Streszczenie. Do regulacji napi􀄊cia skuteczn􀄅 metod􀄅 jest kaskadowe po􀃡􀄅czenie regulatorów napi􀄊a)cia I uk􀃡adów korekcji wspó􀃡czynnika mocy PFC. W artykule omówiono ewolucje ró􀄪nych prze􀃡􀄅czalnych re ulatorów napi􀄊cia. Przedstawiono te􀄪 projekt i zastosowanie dwóch rodzajów regulatorów nie po􀃡􀄅czonych kaskadowo. Ewolucja prze􀃡􀄅czalnych regulatorów napi􀄊cia. Keywords: CMOS, Input harmonic current, PFC, pre-regulator, voltage regulator S􀃡owa kluczowe: CMOS, .regulator napi􀄊cia, korektor wspó􀃡czynnika mocy Introduction In modern world, integrated circuit (IC) is an advanced electric circuit by patterned diffusion of trace elements into the thin surface of a semiconductor material. Today all electronic equipment is used IC, which has revolutionized the world of electronics [1-3]. Due to advent, of complex metal oxide semiconductor (CMOS) technology, semiconductor devices pervade in every discipline of engineeri[...]

Low Voltage and Wide Bandwidth Class AB Variable Gain Amplifier in 0.18-(mikro) m CMOS Technology DOI:10.12915/pe.2014.06.034

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Variable gain amplifier (VGA) is the key element for amplifying process in analog to digital converter (ADC). In this paper, a low voltage and wide bandwidth class AB VGA is designed using CEDEC 0.18-μm CMOS process for high speed applications. The result show that, the designed VGA has a wide bandwidth of 100-MHz and consumes power less than 125uW at 1V supply voltage. From the results it is also evident that the circuit is capable of working with high linearity and wide bandwidth. The frequency response (Gain) and the wide bandwidth of this class AB VGA is better than previously reported class AB VGA. Smaller transistors are used to make the chip small and it occupies only 0.003 μm2. Such a VGA is suitable for high-performance RF devices. Streszczenie. W artykule opisano niskonapięciowy, szerokopasmowy wzmacniacz klasy AB typu VGA (variable gain amplifier - wzmacniacz o zmiennym wzmocnieniu). Wzmacniacz zaprojektowano wykorzystując proces 0.18 um CMOS. Wykonano wzmacniacz o pasmie 100 mHz i poborze mocy mniejszym niż 125 uW przy napięciu zasilania 1 V. (Niskonapięciowy, szerokopasmowy wzmacniacz klasy AB typu VGA w technologii 0.18 um CMOS) Keywords: CMOS, Class AB, High speed, Low Voltage, Variable Gain Amplifier (VGA). Słowa kluczowe: wzmacniacz klasy AB, wzmacniacz VGA - wzmacniacz o zmiennym wzmocnieniu. doi:10.12915/pe.2014.06.34 Introduction Variable gain amplifiers (VGA) are one of the most significant components in wireless communication receivers [1]. In typical communication receivers, VGAs are normally used in a feedback circuit to supply steady signal to baseband analog-to-digital converter (ADC) for random strength of received signal realizing the function of an automatic gain control (AGC). Gain range, power consumption and bandwidth of an ADC are strongly influenced by the performance of operational amplifier. In low voltage applications like wireless communication, mobile imaging applications etc. high-pe[...]

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