IJE TRANSACTIONS A: Basics Vol. 32, No. 4 (April 2019) 528-535    Article in Press

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P. Gupta and R. Pandey
( Received: July 25, 2018 – Accepted in Revised Form: March 07, 2019 )

Abstract    In this paper a voltage mode four quadrant analog multiplier (FQAM) using voltage differencing buffered amplifier (VDBA) based on quarter square algebraic identity is presented. In the proposed FQAM the passive resistor can be implemented using MOSFETs operating in saturationregion thereby making it suitable for integration. The effect of non idealities of VDBA has also been analyzed in this paper. Theoretical propositions are verified through SPICE simulations at 0.18μm CMOS technology node and the simulation results are found in close agreement with theoretical values. The supply voltage is taken as ± 1V and the value of the bias current is set to 40µA.The simulated total harmonic distortion (THD) is observed to be under 3% and the total power dissipation is found as 627µW. The workability of the proposed FQAM is also tested through two applications, namely, an amplitude modulator and a rectifier. The simulated results corroborate the theoretical propositions.


Keywords    Analog Building Blocks; Voltage Differencing Buffered Amplifier; Four Quadrant Analog Multiplier; Quarter Square Algebraic Identity



در این مقاله یک حالت ولتاژ چهار ضریب آنالوگ چهارگانه (FQAM) با استفاده از تقویت کننده بافر ولتاژ (VDBA) بر اساس هویت جبری مربع ارائه شده است. در FQAM پیشنهادی، مقاومت منفعل را می توان با استفاده از MOSFET های عامل در منطقه اشباع اجرا کرد و بنابراین آن را برای ادغام مناسب می کند. در این مقاله اثر غیر آرایشی VDBA نیز مورد تحلیل قرار گرفته است. گزاره های نظری از طریق شبیه سازی SPICE در گره فن آوری CMOS 0.18μm تایید شده و نتایج شبیه سازی در توافق نزدیک با مقادیر نظری یافت می شود. ولتاژ منبع تغذیه به عنوان ± 1V محاسبه می شود و مقدار جریان تعادلی به 40μA تنظیم می شود. اعوجاج هارمونیک کل تداخل (THD) کمتر از 3٪ مشاهده می شود و کل قدرت تخلیه به 627μW می رسد. کارایی پیشنهاد FQAM نیز از طریق دو برنامه کاربردی، یعنی یک مدولاتور دامنه و یک یکسو کننده، مورد آزمایش قرار می گیرد. نتایج شبیه سازی گزاره های نظری را تأیید می کند.


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