A chopper amplifier with a pseudo MOS resistor-based tunable bandwidth for EEG applications

Abstract

Purpose

The purpose of chopper amplifier is to provide the wideband frequency to support biomedical signals.

Design/methodology/approach

This paper proposes a chopper-stabilized amplifier with a cascoded operational transconductance amplifier. The high impedance loop is established using an MOS pseudo resistor and with a tunable MOS capacitor.

Findings

The total power consumption is 451 nW with a supplied voltage of 800 mV. The Gain and common mode rejection ratio are 48 dB and 78 dB, respectively.

Research limitations/implications

All kinds of real time data analysis was not carried out, only few test samples related to EEG signals are validated because the real time chip was not manufactured due to funding issues.

Practical implications

The proposed work was validated with Monte-Carlo simulations. There is no external funding for the proposed work. So there is no fabrication for the design. But post simulations are performed.

Originality/value

The high impedance loop is established using an MOS pseudo resistor and with a tunable MOS capacitor. To the best of the author’s knowledge, this concept is completely novel and there are no publications on this work. All the modules designed for chopper amplifier are new concepts.

Citation

Sajja, A. and Rooban, S. (2023), "A chopper amplifier with a pseudo MOS resistor-based tunable bandwidth for EEG applications", Microelectronics International, Vol. 40 No. 3, pp. 198-205. https://doi.org/10.1108/MI-06-2022-0106