A Numerically controlled oscillator for all Digital Phase Locked Loop
|International Journal of Engineering Trends and Technology (IJETT)||
|© 2016 by IJETT Journal|
|Year of Publication : 2016|
|Authors : Anupama.Patil, Dr P .H .Tandel
|DOI : 10.14445/22315381/IJETT-V38P233|
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
Numerically Controlled Oscillator (NCO) is a digital oscillator signal generator. It generates a synchronous ,clocked, discrete waveform, usually sinusoidal . 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). 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.
 Jane Radatz, The IEEE Standard Dictionary of Electrical &
Electronics Terms,IEEE Standards office, New York, NY, 1997.
 Numerically Controlled Oscillator, Lattice Semiconductor Corporation, 2009.
 Wenmiao Song, Qiongqiong Yao, “Design and Implement of QPSK Modem Based on FPGA”, North china Electric power University,Baoding, china IEEE, 2010.
 M.L. Welborn, “Direct Waveform Synthesis for software Radios,” IEEE Wireless Communications and Networking Conference WCNC. 1999, vol. 1, pp.211-215, September 1999.
. Gopal D. Ghiwala, Pinakin P. Thaker, GireejaD.Amin, “Realization of FPGA based numerically Controlled Oscillator”, IOSR Journal of VLSI and Signal Processing (IOSR-JVSP) ISSN: 2319 – 4200, ISBN No. : 2319 – 4197 Volume 1, Issue 5, PP 07-11, (Jan. - Feb 2013).
 Priyankap. Chopda, Kavita S. Tated&Jayant J. Chopade, “Sine Wave Generation Using Numerically Controlled Oscillator Module”,BEST: International Journal of Management, Information Technology and Engineering (BEST: IJMITE) ISSN(P): 2348- 0513;ISSN(E):2454-471X Vol. 3, Issue 7 , 35-40, Jul 2015.
 I.Janiszewski;F M Darmstadt,Germany;B.Hoppe;H Meuth, “Precision and performance of numerically controlled oscillators with hybrid function generators”, 2001 lEEE International Frequency Control Symposium and FDA Exhibition, page no.744-752.
 S. Menon;Sch of Eletr and Comp Engg,Oklohoma State Univ; Stillwater,OK,USA; G Cho; M Soderstrand,”An Improved Numerically Controlled Digital Oscillator” Communications computers and signal processing,2003 PACRIM, 2003 IEEE Pacific RIM Conference Print ISBN:0-7803-7978-0 pages 1040- 1044.
 In Gi Lim and When-Woo Kim ,”A Numerically Controlled Oscillator with a Fine Phase Tuner and a Rounding Processor,ETRF Journal p-ISSN -1225 6463 e-ISSN-2223 7326.
 Gaurav Gupta, Monika Kapoor, “An Improved Analog Waveforms Generation Technique using Direct Digital Synthesizer”, International Journal of Computer Applications (0975 – 8887) Volume 78 – No.5, September 2013.
. Gopal D. Ghiwala, Pinakin P. Thaker, GireejaD.Amin, “Realization of FPGA based numerically Controlled Oscillator”, IOSR Journal of VLSI and Signal Processing (IOSR-JVSP) ISSN: 2319 – 4200, ISBN No. : 2319 – 4197 Volume 1, Issue 5, PP 07- 11, (Jan. - Feb 2013).
. SnehalGaikwad, KunalDekate, “Design and Implementation of Feasible Direct Digital Synthesizer to Eliminate Manual Tweaking”, IOSR Journal of VLSI and Signal Processing (IOSR-JVSP) Volume 2, Issue 4, , PP 53-56e-ISSN: 2319 – 4200, p-ISSN No. : 2319 – 4197,(May. – Jun. 2013).
 Q. K. Omran, M.T. Islam, N. Misran, "Design and Simulation of High Spectral Purity Numerically Controlled Oscillator", Applied Mechanics and Materials, Vols. 229-231, pp. 2117-2121, 2012
NCO, ADPLL, Sine Wave, Digital.