Design of a low noise single-ended sensor interface amplifier for bio-potential applications | ||||
| Journal of Engineering Science and Military Technologies | ||||
| Article 6, Volume 8, Issue 1, March 2024, Page 69-79 PDF (1.56 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/ejmtc.2023.233183.1263 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
Mohamed Taha1; Ahmed Naguib  2
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| 1Military technical College | ||||
| 2Electronic Engineering Department, Military Technical College | ||||
| Abstract | ||||
| 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. | ||||
| Keywords | ||||
| Chopping technique; flicker noise; low noise; low power; offset; sub-threshold | ||||
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