By Dr. Refet Fırat Yazıcıoğlu, Prof. Dr. Chris Van Hoof, Prof. Dr. Robert Puers (auth.)
In contemporary years, we now have witnessed a innovative switch in biomedical sign tracking. the normal manner of utilizing cumbersome tools is being changed by means of transportable or even wearable acquisition structures with instant info transmission that may let many non-clinical functions that depend on biomedical sign tracking. the most motive force functions are early-warning structures, wellbeing, convenience and activities tracking, brain-computer interfaces, gaming and leisure. the typical specifications from these kind of purposes are miniature dimension, unobtrusiveness, excessive sign caliber, and long term energy 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 structures. the point of interest of this ebook 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 platforms which are a stepping stone in the direction of sensible miniaturized and low-power structures.
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Extra resources for Biopotential Readout Circuits for Portable Acquisition Systems
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. 2, but also performs the operation of the transresistance stage, which allows to save considerable power compared to the CBIA architecture of Fig. 2. 1 Gain-Bandwidth of the CBIA The voltage gain of the CBIA architecture can be calculated from the low-frequency small-signal half-circuit , Fig. 4, of the simplified CBIA structure. 11) where Rout,eq equals to Rds,1 //Rout,2 .
The effect of the drain-to-source voltage mismatch of the input pair transistors on the CMRR of the IA can be described as follows: The differential input voltage to the IA is copied to the terminals of R1 . If we assume that the gmi has infinite transconductance, the drain to source voltage of the input pair transistors will differ by the amount of the differential input voltage. Hence, there will be a gds mismatch between the input pair transistors. 7(b) shows the introduced mismatch gds to the input pair transistors.
10) are also shown in the same figure to Fig. 8 Comparison of the calculated, the simulated, and the measured CMRR of the implemented CBIA 30 24-Channel EEG Readout Front-End ASIC demonstrate their contribution to CMRReq . Under low differential DC input voltage, CMRReq is defined by the process related mismatches of the circuit. However, as the differential DC input increases, which is the operating region of a biopotential IA, CMRReq is reduced due to the reduction in CMRR gds . The simulated, calculated, and measured CMRR fits well in the large differential DC input voltage regions.
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