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.

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