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Article
Design of Low-Cost Multi-Waveforms Signal Generator Using Operational Amplifier

Author: Ali S. Aziz
Journal: Iraqi Journal of Applied Physics المجلة العراقية للفيزياء التطبيقية ISSN: 18132065 23091673 Year: 2018 Volume: 14 Issue: 1 Pages: 13-18
Publisher: iraqi society for alternative and renewable energy sources and techniques الجمعية العراقية لمصادر وتقنيات الطاقة البديلة والمستجدة

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Abstract

Function signal generator has a wide range of applications in electronic measurement and teaching. Yet, many of the trading tests signal generators are bulky and expensive. Furthermore, many types of them are in a fixed operating mode with limited utilized signals. The aim of this research paper is to design a multi-functional, multi-waveform with high accuracy economic signal generator based on operational amplifier, which is able to provide waveforms that are commonly used in electronics experiments. The circuit is simulated in Multisim software, and the hardware circuit is validated. The results show that using Multisim simulation results are basically consistent with the hardware circuit. The output value of the waveforms of the signal generator are square, triangle, sine wave with voltage range of (0-14 V) and output frequency range of (50 Hz-3.1 kHz). The signal generator has simple, practical, low cost features and the important application value.


Article
Design of a High Linearity Four-Quadrant Analog Multiplier in Wideband Frequency Range

Authors: Abdul kareem Mokif Obais --- Rusul Salah Khadair
Journal: Journal of University of Babylon مجلة جامعة بابل ISSN: 19920652 23128135 Year: 2017 Volume: 25 Issue: 2 Pages: 568-578
Publisher: Babylon University جامعة بابل

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Abstract

In this paper, a voltage mode four quadrant analog multiplier in the wideband frequency rangeis designed using a wideband operational amplifier (OPAMP) and squaring circuits. The wideband OPAMP is designed using 10 identical NMOS transistorsand operated with supply voltages of ±12V. Two NMOS transistors and two wideband OPAMP are utilized in the design of the proposed squaring circuit. All the NMOS transistors are based on 0.35µm NMOStechnology. The multiplier has input and output voltage ranges of ±10 V, high range of linearity from -10 V to +10 V, and cutoff frequency of about 5 GHz. The proposed multiplier is designed on PSpice in Orcad 16.6

في هذه البحث تم تصميم المضاعف التناظري بنمط الفولتية لنطاق ترددي عريض يعمل في الارباع الاربعة باستخدام المكبرات التشغيلية (OPAMPs) ودوائر التربيع (squaring circuits) ذات المديات العريضة النطاق. ان المكبر التشغيلي المقترح يعمل باستخدام مجهز قدرة ذي فولتيات تجهيز مقدارها12 ± فولت وقد صمم باستخدام 10 ترانزستورات من نوعNMOS . وقد تم استخدام اثنين من الترانزستورات نوعNMOS واثنين من المكبرات التشغيلية ذات النطاق الترددي العريض في تصميم دائرة التربيع المقترحة. جميع الترانسسترات المستخدمة في الدوائر المقترحة تم تصميمها باعتماد تقنية 0.35 مايكرومتر. يمتاز المضاعف التناظري المقترح بمديات ادخال واخراج تصل الى±10 فولت وكذلك بعلاقة خطية عالية جدا والتي تمتد من -10 إلى +10 فولت و بتردد قطع يصل الى حوالي 5 غيغاهرتز. تم تصميم المضاعف التناظري واختباره باستخدام برنامج الاوركاد 16.6.

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