By Bert Lenaerts
Biopotential Readout Circuits for moveable Acquisition structures describes one of many major construction blocks of such miniaturized biomedical sign acquisition structures. the focal point of this e-book is at the implementation of low-power and high-performance built-in circuit construction blocks that may be used to extract biopotential indications 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 platforms.
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Extra info for Omnidirectional Inductive Powering for Biomedical Implants
2 AC Coupled Chopper Modulated IA (ACCIA) 41 Fig. 1 Concept of the AC-coupled chopped instrumentation amplifier As a consequence, it can be concluded that the ACCIA structure of Fig. 4) thus it is capable of filtering the differential DC electrode offset between the biopotential electrodes. 11). 5) This indicates that SACCIA equals to the thermal noise component of the SCBIA , SCBIA,thermal . In addition to the noise of the ACCIA, the GM stage also contributes to the total noise of the ACCIA. However, this contribution is not important in the pass-band of the ACCIA since the input referred noise of the GM stage is filtered by its transfer function.
Unlike the OTA2 -Cext2 filter, the input of OTA1 is connected to the output of the CBIA, before the output chopper. At this node the input voltage to the ACCIA is modulated to fc . Therefore, the OTA1 -Cext1 filter only passes the amplified offset voltage of the CBIA. The gm1 stage converts the voltage output of the OTA1 -Cext1 filter to current, which is mirrored to the terminals of R1 through the current mirrors CM1 and CM2 . At steady-state the current difference between the branches of the gm1 stage equals to the input referred offset voltage of the CBIA divided by R1 , Voffset,CBIA /R1 .
Therefore, the gain, the LPF cut-off frequency, and the HPF cut-off frequency can be precisely defined with three external passives. 1 shows the dimensions and the operating points of the implemented IA. 3) fIA,HPF = 24 24-Channel EEG Readout Front-End ASIC Fig. 3 Schematic of the OTA1 of Fig. 2 The resistor R1 is selected as 10 k and implemented using hipo resistors. If R2 is selected as 200 k the gain is set to 10. The LPF cut-off frequency of the IA can be set to 80 Hz by selecting CLPF as 10 nF.