Biopotential Readout Circuits for Portable Acquisition by Dr. Refet Fırat Yazıcıoğlu, Prof. Dr. Chris Van Hoof, Prof.

By Dr. Refet Fırat Yazıcıoğlu, Prof. Dr. Chris Van Hoof, Prof. Dr. Robert Puers (auth.)

In contemporary years, now we have witnessed a innovative switch in biomedical sign tracking. the conventional approach of utilizing cumbersome tools is being changed by means of transportable or even wearable acquisition platforms with instant facts transmission that may let many non-clinical functions that depend on biomedical sign tracking. the most driving force purposes are early-warning platforms, well being, convenience and activities tracking, brain-computer interfaces, gaming and leisure. the typical requisites from these kinds of functions are miniature dimension, unobtrusiveness, excessive sign caliber, and long term strength autonomy. This calls for ultra-low-power and miniature SiP/SoC biomedical sign acquisition structures.

Biopotential Readout Circuits for moveable Acquisition Systems describes one of many major development blocks of such miniaturized biomedical sign acquisition platforms. the focal point of this publication is at the implementation of low-power and high-performance built-in circuit development blocks that may be used to extract biopotential signs from traditional biopotential electrodes. New instrumentation amplifier architectures are brought and their layout is defined intimately. those amplifiers are used to enforce whole acquisition demonstrator structures which are a stepping stone in the direction of useful miniaturized and low-power structures.

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7 Conclusions 37 Although the large number of external passive circuits and the comparatively large current consumption of the ASIC is a disadvantage in terms of system size and power autonomy, the presented ASIC is still an important improvement compared to the systems implemented with off-the-shelf components. 1 Introduction The readout front-end ASIC of Chap. 3 requires a large number of off-chip components and has a relatively large current consumption. Although, its usage can considerably improve the size of the existing biopotential acquisition systems, the relatively large current consumption still limits the power autonomy of the system.

This disturbs the equality of the voltages at the gates of the transistors M2 and M3 . This voltage difference creates a current through R2 . This current disturbs the equality of the currents passing through M2 and M3 . At steady state, the current difference between M1 and M2 reaches to the same value as the current passing through R1 . As a result, the current passing through the input transistors M2 and M3 are held constant. Therefore, the transconductance stage implemented by M2 , M3 and R2 not only serves the purpose of the gmi stage of the CBIA architecture in Fig.

Represents the ratio of fLP,ACCIA /fCSF the CSF stage is kept below 10%, then the effect of the CSF stage on the output noise of the ACCIA is negligible. However, this limits the minimum fLP,ACCIA due to the fact that most of the spike energy must be concentrated in the 10% of the CSF stage operating period, TCSF . The time constant of the distortion spikes at output of the ACCIA can be given as (refer to Sect. 13). Hence, TOFF must be larger than 3 × τACCIA so that the ACCIA output can settle after the chopper switches change their state.

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