IJE TRANSACTIONS C: Aspects Vol. 28, No. 12 (December 2015) 1738-1745   

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S. V. Singh, R. S. Tomar and D. S. Chauhan
( Received: February 25, 2015 – Accepted: December 24, 2015 )

Abstract    The trans-admittance-mode (TAM) might act as a transforming bridge for voltage-mode to current-mode conversion. In this study a new low voltage operated electronically tunable TAM biquad filter structure realizing all the seven standard filtering functions namely; low-pass (LP), band-pass (BP), high-pass (HP), regular-notch (RN), low-pass-notch (LPN), high-pass-notch (HPN) and all-pass (AP) from the same configuration through appropriate selection of voltage inputs is presented. The proposed circuit structure comprises of three current conveyor trans-conductance amplifiers (CCTAs). Moreover, the new biquad filter structure still enjoys (i) realizations neither require inverted nor scaled voltage input(s), (ii) the employment of two grounded capacitors (Ideal for IC implementation and attractive for absorbing shunt parasitic capacitances), (iii) the pole frequency can be tuned electronically, (iv) possesses low incremental active and passive sensitivity performance and useful in low-voltage low-power applications. PSPICE simulation results using 0.25μm TSMC CMOS parameters verify the theoretical analysis.


Keywords    Analog signal processing, Biquad, Filter, Transadmittance-mode.


چکیده    ترانس حالت عبوری (TAM) می­تواند به عنوان یک پل برای تبدیل حالت ولتاژ به تبدیل حالت جریان عمل کند. در این مطالعه یک فیلتر جدید کم ولتاژ TAM الکترونیکی با ساختار biquad با استفاده از تمام هفت نوع تابع استاندارد فیلتر یعنی: پایین گذر (LP)، باند گذر (BP)، بالا گذر (HP)، شکاف معمولی (RN)، شکاف معمولی پایین گذر (LPN)، شکاف معمولی بالا گذر(HPN) و تمام گذر (AP) از همان پیکربندی از طریق انتخاب مناسب سیگنال­های ورودی ولتاژ ارائه شده است. ساختار مدار پیشنهادی شامل سه ترانس تقویت جریان CCTAs) است. علاوه بر این، ساختار فیلتر biquad جدید: (1) نه نیاز به معکوس کردن، و نه کوچک کردن ولتاژ ورودی (2) به کارگیری دو خازن، و از این رو فراهم ساختن ساختار متعارف مخروطی، (3) امکان تنظیم الکترونیکی فرکانس قطب، و(4) دارا بودن حساسیت فعال و غیر فعال کم و مفید در برنامه های کاربردی ولتاژ و قدرت پایین است. نتایج شبیه سازی PSPICE با استفاده از پارامترهای 0 CMOS TSMC μm 25 /0 تحلیل نظر را تایید می­کند.



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