IJBTT

A Numerically controlled oscillator for all Digital Phase Locked Loop

	International Journal of Engineering Trends and Technology (IJETT)
	© 2016 by IJETT Journal
	Volume-38 Number-4
	Year of Publication : 2016
	Authors : Anupama.Patil, Dr P .H .Tandel
	DOI :  10.14445/22315381/IJETT-V38P233

Citation 

Anupama.Patil, Dr P .H .Tandel"A Numerically controlled oscillator for all Digital Phase Locked Loop", International Journal of Engineering Trends and Technology (IJETT), V38(4),186-189 August 2016. ISSN:2231-5381. www.ijettjournal.org. published by seventh sense research group

Abstract
Numerically Controlled Oscillator (NCO) is a digital oscillator signal generator. It generates a synchronous ,clocked, discrete waveform, usually sinusoidal [1]. NCOs are often used in combination with a digital to analog converter (DAC) at the output to create a direct digital synthesizer (DDS).NCOs are used in many communications systems which are completely digital or mixed signal, like arbitrary waveform synthesis, precoise control for phased array radar or SONAR systems, All digital PLLs, Digital Down/Up converters for Cellular and PCS base stations and drivers for optical or acoustic transmissions & multilevel FSK / PSK modulators or demodulators(modem)[2]. The NCO used in our ADPLL has been modeled using matlab simulink and realized on FPGA board for hardware Realization. The designs are tested on Xilinx Nexys 4 DDR Artix 7 FPGA Development Platform . A FPGA based Implementation method greatly improves the performance, reduces the development cycle and reduces cost. The basic NCO architecture is improved and enhanced with the minimum hardware in order to facilitate the complete system level support for different kinds of modulation with minimal FPGA resources. This paper presents the implementation of Siusoidal Wave Generation using NCO module which improves the performance, reduces the power & area requirement.

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Keywords
NCO, ADPLL, Sine Wave, Digital.