طراحی یک فرستنده IR-UWB با چگالی طیفی توان تطبیق‌پذیر در محدوده Gpps 0.02-1.4

نویسندگان

دانشکده مهندسی برق - دانشگاه صنعتی سهند - تبریز

چکیده

بسیاری از فرستنده‌های رادیویی UWB برای نرخ تکرار پالس خاصی طراحی شده‌اند. به این معنی که چگالی طیفی توان در این فرستنده‌ها، به‌طور کامل با ماسک توان FCC منطبق نبوده و به‌ازای برخی از نرخ‌های تکرار پالس، از محدوده توانی آن تجاوز می‌کند. این مسئله در کاربردهای بی‌سیم برد کوتاه که به نرخ تکرار پالس متغیر نیاز دارند اهمیت به سزایی دارد. در این مقاله، یک فرستنده IR-UWB با چگالی طیفی توان تطبیق‌پذیر مبتنی بر مدولاسیون OOK در تکنولوژی 180 نانومتر CMOS شرکت TSMC طراحی شده است. تطبیق‌پذیری چگالی طیفی توان پالس UWB فرستنده با نرخ تکرار پالس، با استفاده از تکنیک پیش‌شارژ تک‌سیکل محدود محقق شده و از آشکارساز فاز/فرکانس به‌منظور گسترش محدوده آن استفاده شده است. پالس UWB نیز توسط فیلتر شکل‌دهنده تولید شده است. نتایج شبیه‌سازی پساجانمایی نشان می‌دهند که قله چگالی طیفی توان، به‌ازای نرخ تکرار پالس در بازه Gpps 0.02-1.4، در محدوده توان تشعشعی همسانگرد معادل، یعنی dBm/MHz -41.3 بوده و دارای تغییراتی برابر با dBm/MHz 3.38 است. با در نظر گرفتن تمامی مدارات به‌کار رفته، توان مصرفی کلی فرستنده در نرخ‌های تکرار پالس 10، 100، 500 و Mpps 1400 به‌ترتیب برابر با 0.293، 0.6235، 0.792 و mW 2.022 است. مساحت ناحیه فعال تراشه بدون در نظر گرفتن بالشتک‌های STG و اتصال mm2 0.38 است.

کلیدواژه‌ها

عنوان مقاله [English]

Design of an IR-UWB Transmitter with Adaptive Power Spectral Density in 0.02 – 1.4 Gpps

نویسندگان [English]

  • F. Gozalpour
  • A. Habibzadeh-Sharif
  • E. Najafi Aghdam
Faculty of Electrical Engineering, Sahand University of Technology, Tabriz, Iran
چکیده [English]

Most of the ultra wideband (UWB) transmitters are designed for a specific pulse repeating rate (PRR). This means that the power spectral density (PSD) in these transmitters is not completely adaptable to the FCC power mask and for some PRRs, it exceeds the mask power limits. This is an important issue in short-range applications requiring a variable PRRs. In this paper, an on-off keying (OOK) impulse radio ultra wideband (IR-UWB) transmitter with adaptive PSD is proposed in 180 nm TSMC CMOS technology. The adaptivity of the PSD with PRR has been obtained using a limited monocycle precharge (LMPC) technique and phase/frequency detector (PFD) has been used in order to expand its range. The UWB pulse has been generated based on shaping filter. The results of post layout simulation show that the PSD peak value is kept closely below the equivalent isotropically radiated power (EIRP) limit, i.e., -41.3 dBm/MHz in 0.02-1.4 Gpps with only the variation of 3.38 dBm/MHz. The overall power consumption of transmitter including all of the circuits at PRRs of 10, 100, 500, and 1400 Mpps is only 0.293, 0.6235, 0.792, and 2.022 mW, respectively. The active circuit area excluding bonding pads and STG pads is only 0.38 mm2.

کلیدواژه‌ها [English]

  • UWB transmitter
  • impulse radio (IR)
  • pulse generator
  • power spectral density (PSD)

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