The proposed two-electrode biosignal read-out circuit effectively compensates for impedance mismatch and improves common-mode interference rejection, demonstrating potential for high-quality ECG recordings.
Offers compact two-electrode cardiac monitoring without mismatch; leaves open clinical validation and real-world performance.
In this paper, a two-electrode system performing biomedical signal recordings is presented. Thanks to a continuous balancing of the impedance bridge included in the front-end, the proposed system does not suffer the impedance mismatch of a two-electrode front-end that may affect the biopotential measurement. The rejection of the common mode interference has been improved by including a bootstrapped instrumentation amplifier [showing 133 dB common-mode rejection ratio]. The front-end differential input impedance is very high, being in the worst case 500 MQ, whereas its common-mode input impedance is 135 kQ. The proposed architecture also works for an unfavorable input signal-to-noise ratio (SNR) as low as -14 dB. As an example, the electronic interface has been designed and tested for an ECG-like signal. Preliminary tests on a discreteelement electronic prototype have shown the overall system capability of easily recording the heart signal, having evaluated an experimental output SNR of about 32 dB. In addition, the effectiveness of the feedback implementation in restoring the impedance balance has been demonstrated in practice.
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Parente et al. (2018) studied this question.
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