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Analytical and Optimization Based Modeling Techniques to Assess the Performance of Submicron Sic Mesfets

Thesis Info

Access Option

External Link

Author

Riaz, Muhammad

Program

PhD

Institute

Capital University of Science & Technology

City

Islamabad

Province

Islamabad.

Country

Pakistan

Thesis Completing Year

2017

Thesis Completion Status

Completed

Subject

Applied Sciences

Language

English

Link

http://prr.hec.gov.pk/jspui/bitstream/123456789/8127/1/Muhammad_Riaz_Micro_Elect_HSR_2017_CUST_23.01.2018.pdf

Added

2021-02-17 19:49:13

Modified

2024-03-24 20:25:49

ARI ID

1676725497426

Similar


In therst part of the thesis, a detailed analytical mathematical model describing I ? V characteristic of a submicron SiC MESFET has been presented. Poisson''s equation with appropriate boundary conditions is solved to determine potential distribution inside the channel. The location of Schottky barrier gate with corresponding depletion layer width where the carrier''s velocity gets saturated is evaluated. It has been demonstrated that the depletion modi cation underneath the Schottky barrier gate causesnite output conductance in the saturation region of operation. I ? V characteristics of submicron SiC MESFET have been modeled and compared with conventional velocity saturation techniques, where the depletion layer after the onset of current saturation has been treated as constant. It is noted that the proposed depletion layer modi cation technique, when incorporated in the device modeling, gave15.9% improvement in the modeled out characteristics of a submicron SiC MESFET. In the second part, an improved empirical model has been presented to simulate DC and pulsed I ? V characteristics of SiC MESFETs. A comparative analysis has been carried out by employing swarm optimization technique and it has been established that the proposed model, dependent upon the device characteristics, is7-24% better than its counterparts. Based on simulated characteristics, numerous parameters de ning the device geometrical structure have been estimated to a good degree of accuracy. It has been shown that the developed technique is versatile enough and can be a useful tool for device simulation softwares. In the third part, a technique has been developed to estimate intrinsic small signal parameters of submicron SiC MESFETs, designed for high power microwave applications. In the developed technique, small signal parameters are extracted by involving drain-to-source current, Ids instead of Schottky barrier depletion layer expression. It has been demonstrated that in SiC MESFETs, the depletion layer gets modi ed due to intense transverse electriceld and/or self-heating e ects, which are conventionally not taken into account. Thus, assessment of AC small signal parameters by employing depletion layer expression loses its accuracy for x devices meant for high power applications. A set of expressions for AC small signal elements have been developed using Ids and their dependence on device biasing have been discussed. The validity of the proposed technique has been demonstrated using experimental data.
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ا یڈو رڈ ویسٹر مارک

مارک، ایڈورڈ ویسٹر
ایڈورڈ ویسٹر مارک کا انتقال
ایڈورڈ ویسٹر مارک نے جو ایک عرصہ تک لندن یونیورسٹی میں عمرانیات کا پروفیسر تھا، گزشتہ اکتوبر میں انتقال کیا، وہ ایک عمیق النظر فلسفی اور بین الاقوامی شہرت کا مالک تھا، اوائل زندگی میں اس کو خیال پیدا ہوا کہ اخلاقی خیالات اور مذہبی اعتقادات میں گہرا تعلق ہے، چنانچہ اس نقطہ نظر سے اس نے یورپ کے علاوہ دوسری قوموں کے روایات اور اعتقادات کا مطالعہ کرنا چاہا اور اس کے لئے مراکش کو منتخب کیا، اور وہاں جاکر چار سال تک مقیم رہا، یہاں اس نے نہ صرف انسانیاتی معلومات جمع کئے، بلکہ وہاں کے لوگوں طرز زندگی و غور و فکر سے بھی واقفیت حاصل کرکے ان کے رسم و رواج کو آسانی سے سمجھا جو تمدن کے مختلف دور میں پیدا ہوتے رہے، یہاں کی تحقیقات اس نے اپنی مشہور کتاب ’’اخلاقی تخیلات کی ابتدا اور نشوونما‘‘ (The origin and development of moral ideas) میں قلمبند کی جو دو جلدوں میں ۱۹۰۶؁ء اور ۱۹۰۸؁ء میں شائع ہوئی تھی، یہ کتاب بہت اہم اور بلند پایہ سمجھی جاتی ہے اور اخلاقیات پر ایک فلسفیانہ مقالہ یا اخلاقی خیالات کی تاریخ کہی جاسکتی ہے، اس کتاب کی خوبی یہ ہے کہ اس میں تحلیلی اور تاریخی تجزیوں میں امتزاج پیدا کرکے یہ دکھایا گیا ہے کہ اخلاقی پسندیدگی اور ناپسندیدگی کی ابتدا معاشرتی تکدر اور تشکر سے ہوتی ہے، ڈاکٹر ویسٹر مارک کی اور دوسری تصنیفات یہ ہیں، مراکش میں انسانی شادی، رسم اور اعتقاد کی تاریخ، (۲)اخلاقی اضافیت، (۳)عیسائی مذہب اور اخلاق۔
(’’ص ۔ ع‘‘، دسمبر ۱۹۳۹ء)

 

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