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Article
Performance Optimizing of Fourth Order Delta- Sigma Fractional-N Frequency Synthesizer using a Dither Technique for Third Generation (3G)

Authors: M.N. Raheema --- H.A. Nassir --- A.K. Naher
Journal: Iraqi Journal of Applied Physics المجلة العراقية للفيزياء التطبيقية ISSN: 18132065 23091673 Year: 2011 Volume: 7 Issue: 1 Pages: 3-9
Publisher: iraqi society for alternative and renewable energy sources and techniques الجمعية العراقية لمصادر وتقنيات الطاقة البديلة والمستجدة

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Abstract

This paper proposes a frequency synthesizer for WCDMA applications. Different techniques for phase noise reduction are discussed. Sigma-delta fractional-N technique is chosen for WCDMA system, since low settling time, spurious level and phase noise can be obtained by using this technique. Also it is proposed to add dither before the quantizer of modulator in order to eliminate any distortions introduced by the quantization stage. Design parameters for the proposed order (1-1-1-1) MASH fractional-N synthesizer for 3G are selected from the results of analysis for each unit of the proposed system and according to WCDMA standards. Simulation results prove that the proposed dithered frequency synthesizer for the WCDMA application is very efficient in reducing noise. The in-band phase noise obtained with this synthesizer is -96dBc/Hz. MATLAB (R2010a) are used for simulation of MASH (1-1-1-1) fractional-N frequency synthesizer.


Article
Design and Simulation of A Third Order MASH (1-2) Modulator for GSM Applications
تصميم و محاكاة مضمن الاشاره من نوع (Third Order MASH (1-2)) لمنظومة GSM

Author: Sabah A. Gitaffa صباح عبد الحسن كطافة
Journal: Al-Rafidain University College For Sciences مجلة كلية الرافدين الجامعة للعلوم ISSN: 16816870 Year: 2016 Issue: 37 Pages: 342-357
Publisher: Rafidain University College كلية الرافدين الجامعة

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Abstract

This paper presents a design and simulation of proposed MASH (Multi-stAge noiSe sHaping) modulator which can be used for GSM applications. MASH technique is chosen for GSM system, since low settling time, spurious level and phase noise can be obtained by using this technique. The phase noise obtained with this modulator is 30 dB if compared with other modulating techniques. Matlab (R2013a) is used for simulation of 3rd order, 32-bit digital MASH modulator.

هذا البحث يتضمن تصميم ومحاكاة مضمن مقترح لمنظومة GSM. تم اختيار تقنية مضمن من نوع (MASH) لمنظومة GSM، وذلك لتأمينها ضوضاء منخفضة وحزمة عريضة ودقة تفريق بالتردد عالية. النتائج التي تم الحصول عليها هي -30 dB اذا ماتم مقارنتها بالتقنيات السابقة. تم أستخدام برنامج Matlab (R2013a) في محاكاة مركب التردد من نوع (Third order MASH / type (1-2)).

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