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A low-power reconfigurable biopotential sensing amplifier achieved a dynamic range of more than 62.8 dB and total harmonic distortion better than 60 dB across the whole bandwidth.
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A novel gate-balanced pseudoresistor design for biopotential sensing amplifiers improves linearity and dynamic range for applications like ECG measurement.
A low-power reconfigurable biopotential sensing amplifier with highly linear feedback pseudoresistors is presented. Due to the gate-balanced pseudoresistors, amplifier linearity has been significantly improved, achieving a dynamic range more than 62.8 dB, with total harmonic distortion better than 60 dB across the whole bandwidth. An array of proposed amplifiers was fabricated in a 0.35-μm CMOS process. Measured input-referred noise is 2.81 μV rms with a midband gain of 40.3 dB. The noise efficiency factors corresponding to the bandwidth settings of 100 Hz, 1 kHz, and 10 kHz are 1.88, 1.93, and 2.05, respectively. Using a supply voltage of 2.5 V, each amplifier consumes 3.6 μA of current to achieve a bandwidth of 10 kHz, with a dynamic range of 63.7 dB. The electrocardiogram (ECG) measurement results are shown in this brief to substantiate the necessary low-frequency linearity improvement.
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Wang et al. (2015) studied this question. Reconfigurable biopotential sensing amplifier was evaluated on Dynamic range and total harmonic distortion. A low-power reconfigurable biopotential sensing amplifier achieved a dynamic range of more than 62.8 dB and total harmonic distortion better than 60 dB across the whole bandwidth.
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