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نمایش چکیده فارسی

Design and Optimization of a Sub-threshold Differential Amplifier for Ultra-low-power Biosignal Processing Applications

Zahra rahmati1 Arash Azizpor2 Pourya Ahmadi Amirabadi3 mobin khanzadi4

Abstract :
This paper addresses the design and optimization of an ultra-low-power differential operational transconductance amplifier (OTA) for the acquisition and processing of vital signals, such as the electrocardiogram (ECG) and electroencephalogram (EEG). To achieve the highest possible current-to-bandwidth efficiency and significantly reduce power consumption, all transistors in the differential core are biased in the subthreshold (weak inversion) region. The proposed architecture is based on a telescopic structure featuring a PMOS input pair (to minimize flicker noise) and a self-biased cascode load; this configuration enhances the output resistance—and consequently the circuit s voltage gain—without requiring any additional reference bias voltage. The proposed circuit has been designed and simulated using 0.18-μm CMOS technology, operating with a tail bias current of 15 nA and a supply voltage of 0.6 V. Simulation results demonstrate a total power consumption of 18.4 nW, an open-loop voltage gain of 46.2 dB, a 3-dB bandwidth of 8.2 kHz, and Common-Mode Rejection Ratio (CMRR) and Power Supply Rejection Ratio (PSRR) values of 88 dB and 82 dB, respectively. These specifications, combined with the circuit s distortion-free transient response to a synthesized ECG signal, make it highly suitable for use in implantable biomedical systems and continuous health monitoring devices.

Keywords : differential amplifier subthreshold region biosignal processing ultra low power (ulp) high cmrr and psrr gm/id method cmos technology

زبان مقاله : انگلیسی
محور مقاله : مهندسی برق
محل انتشار : چهارمین کنگره بین المللی علوم، مهندسی و فن آوری های نو
آدرس وب سایت کنفرانس : secongress.com
کد IOI مقاله : ACCA-ACZBEG
لینک مستقیم مقاله : https://isnac.ir/ACCA-ACZBEG
نمایش چکیده فارسی : https://isnac.ir/SA/ACCA-ACZBEG

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