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Information Journal Paper

Title

The Circuit Design of the Receiving Part of the Portable Electro-encephalogram System

Pages

  39-48

Abstract

 In recent years, many electroencephalogram (EEG) devices have become portable and wireless. Given the requirements for mobility, EEG instruments need to be smaller, lighter, and power-efficient with reduced noise and offset. An EEG signal is very weak and its amplitude ranging is from 20 to 200 μ V and its frequency ranges from 0. 1 to 100 Hz. Besides, the skin-electrode interface creates a large DC offset voltage which can be in the order of ± 300 mV. These two challenges can disturb the main signal and reduce the detection accuracy. At the input of amplification section of many EEG circuits, the chopping technique has been applied to convert DC input signals into AC signals. The main transconductance amplifier as EEG instrumentation amplifier (IA) in most of previous works is the folded cascode amplifier. In this paper, we proposed a circuit which design in 0. 18 CMOS technology and its amplifier is a two-stage fully recycling chopper stabilized folded cascode amplifier which operates at low supply voltage and its input-referred noise is decreased by enhancing transconductance while it has a large slew rate, a high DC gain and an improved gain bandwidth. These features significantly decrease the noise and offset without a considerable increase in the power required by the circuit. In the post-layout simulation the amplifier achieves a midband gain of 60 dB and a-3dB bandwidth in the range 0. 1-210 Hz. Moreover, the chip area of the proposed circuit with pads is 512×512 μ m2. The adjustable LPF has a 100 Hz cut-off frequency. The proposed circuit has an input-referred noise of 0. 75 μ Vrms, (0. 1~100Hz) and a power consumption of 760 nW at 1 V supply.

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    APA: Copy

    MORADI, MARZIEH, & Dousti, Masoud. (2022). The Circuit Design of the Receiving Part of the Portable Electro-encephalogram System. JOURNAL OF COMMUNICATION ENGINEERING, 11(44 ), 39-48. SID. https://sid.ir/paper/965663/en

    Vancouver: Copy

    MORADI MARZIEH, Dousti Masoud. The Circuit Design of the Receiving Part of the Portable Electro-encephalogram System. JOURNAL OF COMMUNICATION ENGINEERING[Internet]. 2022;11(44 ):39-48. Available from: https://sid.ir/paper/965663/en

    IEEE: Copy

    MARZIEH MORADI, and Masoud Dousti, “The Circuit Design of the Receiving Part of the Portable Electro-encephalogram System,” JOURNAL OF COMMUNICATION ENGINEERING, vol. 11, no. 44 , pp. 39–48, 2022, [Online]. Available: https://sid.ir/paper/965663/en

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