This paper discusses a low-noise read-out amplifier circuit for a biomedical sensor interface. The amplifier has two amplification stages with a Miller compensation capacitor that offers high gain with a large output swing. For power efficiency, all transistors are operated in a sub-threshold regime that makes the design suitable for implantable and portable medical devices. The proposed design works at the heart of bio-medical sensor interface circuits. It offersan amplification for different bio-potential signals such as electroencephalogram (EEG), electrocardiogram (ECG), and electromyogram (EMG) according to its bandwidth (BW). Furthermore, a small signal model analysis of the proposed amplifier is presented. A chopping technique is also proposed to reduce the sensor offset voltage and the flicker noise generated from sensor interface circuits. The proposed amplifier design achieves a gain and a BW of 62.16 dB and 506 Hz respectively. The input commonmode range (ICMR) varies from 0.3 V to 0.8 V with a phase margin (PM) of 62.57◦ at VCM equals 0.3 V and 66.8◦ at VCM of 0.8 V. The circuit is designed in 130 nm CMOS technology and consumes a power of 0.4 μW from 1 V supply. Also, the chopping technique reduces inputreferred voltage noise from 38.445 μV/sqrt(Hz) to 3.06 μV/sqrt(Hz) within a frequency range from 0.01Hz to 500Hz.
Taha, M., & Naguib, A. (2024). Design of a low noise single-ended sensor interface amplifier for bio-potential applications. Journal of Engineering Science and Military Technologies, 8(1), 69-79. doi: 10.21608/ejmtc.2023.233183.1263
MLA
Mohamed Taha; Ahmed Naguib. "Design of a low noise single-ended sensor interface amplifier for bio-potential applications". Journal of Engineering Science and Military Technologies, 8, 1, 2024, 69-79. doi: 10.21608/ejmtc.2023.233183.1263
HARVARD
Taha, M., Naguib, A. (2024). 'Design of a low noise single-ended sensor interface amplifier for bio-potential applications', Journal of Engineering Science and Military Technologies, 8(1), pp. 69-79. doi: 10.21608/ejmtc.2023.233183.1263
VANCOUVER
Taha, M., Naguib, A. Design of a low noise single-ended sensor interface amplifier for bio-potential applications. Journal of Engineering Science and Military Technologies, 2024; 8(1): 69-79. doi: 10.21608/ejmtc.2023.233183.1263