تقویت‏ کننده کم ‏نویز- میکسر سی‏ ماس با عدد نویز کم و بهره تبدیل بالا برای کاربردهایWLAN

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه الکترونیک، دانشکده مهندسی برق و کامپیوتر، دانشگاه بیرجند، ایران

2 گروه الکترونیک، دانشکده مهندسی برق و کامپیوتر، دانشگاه بیرجند

چکیده

در این مقاله یک تقویت‏کننده کم‏نویز- میکسر ترکیب‏شده برای کاربرد در شبکه‏های محلی بی‏سیم (WLAN) ارائه می‏شود. تقویت‏کننده کم‏نویز- میکسر پایین‏بر پیشنهادشده در باند فرکانس رادیویی (RF) GHz 3-2 و فرکانس میانی (IF)MHz  100 با استفاده از فناوری µm CMOS 18/0 و مدل شرکت TSMC طراحی شده است. در مدار پیشنهادی، برای دست­یابی به تطبیق امپدانس ورودی مناسب، یک شبکه تطبیق جدید در ورودی تقویت‏کننده کم‏نویز (LNA) سورس‏مشترک معرفی می‏شود. همچنین، استفاده از بار فعال و روش تزریق جریان در میکسر باعث بهبود بهره‏ تبدیل و عملکرد نویز مدار می‏شود. مدار تقویت‏کننده کم‏نویز- میکسر پیشنهادی با استفاده از نرم‌افزار ADS شبیه‏سازی شده است. نتایج شبیه‏سازی مداری، مجزاسازی بالا میان درگاه‏ها، بهره تبدیل بالا (CG) در حدود dB 17-15 و عدد نویز (DSB-NF) پایین dB 5/0±4 را نشان می‏دهد. برای بررسی اثر تغییرات فرآیند ساخت بر عملکرد مدار پیشنهادی، شبیه‏سازی مونت‌کارلو با 100 مرتبه تکرار انجام شده است. نتایج شبیه‏سازی مقدار میانگین dB 7/15 با انحراف معیار dB 11/0 را برای بهره تبدیل و مقدار میانگین dB 4/7 با انحراف معیار dB 37/0 را برای عدد نویز نشان داده و حساسیت پایین آن‏ها را به تغییرات ساخت تایید می‏کنند. توان‌ مصرفی تقویت‏کننده کم‏نویز- میکسر پیشنهادی mW 8/19 از ولتاژ تغذیه V 5/1 است‌‌.

کلیدواژه‌ها

عنوان مقاله [English]

Low Noise Figure and High Conversion Gain CMOS LNA-Mixer for WLAN Applications

نویسندگان [English]

  • Abolfazl Bijari 1
  • Salman Zandian 2
1 Faculty of Electrical and Computer Engineering, University of Birjand, Birjand, Iran.
2 Faculty of Electrical and Computer Engineering, University of Birjand, Birjand, Iran,
چکیده [English]

This paper presents a merged low noise amplifier (LNA) and mixer for wireless local area networks (WLANs) applications. The proposed down-conversion LNA-mixer is designed for 2-3 GHz radio frequency (RF) band and an intermediate frequency (IF) of 100 MHz using RF-TSMC CMOS 0.18 μm technology. A new input matching network is introduced for common source LNA to provide good input matching. In addition, the conversion gain (CG) and noise performance of the LNA-mixer are improved by employing an active load and current bleeding technique in the mixer. The proposed LNA-Mixer has been simulated by Advanced Design System (ADS). Simulation results show the high conversion gain of 15–17 dB and low double side-band noise figure (DSB-NF) of 4±0.5 dB as well as high isolation between ports at frequency band of 2-3 GHz. Monte Carlo simulations has been done for the proposed LNA-mixer with 100 samples to verify the impact of process variations and mismatch. For the conversion gain and for DSB-NF, simulation results show respectively a mean (μ) of 15.7 dB with standard deviation (σ) of 0.11 dB, and μ=7.4 dB with σ=0.37 dB and confirm their low sensitivity to process variations. The proposed LNA-Mixer operates at the supply voltage of 1.5 V with power consumption of 19.8 mW.

کلیدواژه‌ها [English]

  • Low noise amplifier
  • Mixer
  • Conversion gain
  • Noise figure
  • Input matching

مراجع

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سابقه مقاله

  • تاریخ دریافت: 04 مهر 1397
  • تاریخ بازنگری: 04 فروردین 1398
  • تاریخ پذیرش: 28 خرداد 1398
  • تاریخ انتشار: 08 مهر 1398

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