مشخصات پژوهش

عنوان	0.4-V Tail-Less Quasi-Two-Stage OTA Using a Novel Self-Biasing Transconductance Cell
نوع پژوهش	مقاله چاپ‌شده در مجلات علمی
کلیدواژه‌ها	Amplifier, OTA, tail-less, CMFB-less, self-biasing, bulk-driven, positive feedback, transconductance
چکیده	This work presents a tail-less fully differential bulk-driven transconductance amplifier without using a common-mode feedback (CMFB) circuit. The proposed amplifier employs two P-type and N-type current mirrors to form two self-biasing positive feedback loops resulting in a double transconductance. The bulk terminals of the P-type current mirrors are used as the input nodes to provide a high input dynamic range. The diode-connected topologies of the current mirrors adaptively bias other transistors to cover the lack of the CMFB circuit. To ensure stability, additional current sources are paralleled with the positive feedback structures. A high output voltage swing and a high DC gain are achieved by adding an adaptively biased common-source amplifier as the output stage leading to a class-AB operation. A large signal analysis, in weak inversion, is also done to mathematically describe both small- and large-signal characteristics. The proposed circuit was fabricated using TSMC 0.18μm CMOS technology occupying a silicon area of 113μm×70μm . Experimental results at a supply voltage of 0.4 V show a gain bandwidth of 7 kHz, a DC gain of 60 dB, and a slew rate of 79 V/ms with just 24 nW power dissipation while driving a capacitive load of 2×15 pF.
پژوهشگران	سافوان مولود حسین (نفر دوم)، میثم اکبری (نفر اول)، کیی-تایونگ تنگ (نفر چهارم)، یاسیر هاشیم (نفر سوم)