Table 6 Comparison of the proposed instrument’s AFE with state-of-the-art ASICs for biopotential signal acquisition (note that, as anticipated, a tradeoff exists between ultra-low power consumption (state-of-the-art ASICs) and superior noise performance (proposed instrument’s AFE))
Parameters | [46] | [47] | [48] | [49] | [50] | This work |
|---|---|---|---|---|---|---|
Supply | 0.2/0.8 V | 1 V | 1.8 V | 1.8 V | 3 V | ±5 V |
Technology | 0.18 μm CMOS | 0.18 μm CMOS | 0.8 μm CMOS | 0.18 μm CMOS | 0.5 μm CMOS | – |
Voltage gain | 776 V/V | 100 V/V | 100 V/V | 3–100 V/V | 10 V/V | 1000 V/V |
Input impedance | ≈ 100 MΩ | > 700 MΩ | > 7.5 MΩ | > 2 GΩ | > 100 MΩ | 200 GΩ |
Input referred noise | 0.94 μV rms (0.5–670 Hz) | 1.3 μV rms (0.5–100 Hz) | 0.95 μV rms (0.05–100 Hz) | 0.8 μV rms (0.5–100 Hz) | 0.6 μV rms (0.5–100 Hz) | 85 nV rms (0.5–100 Hz) |
DC tolerance | – | Rail-to-rail | ±50 mV | Rail-to-rail | ±50 mV | ±85 mV |
CMRR | 85 dB | 60 dB | 100 dB | 82 dB | 120 dB | 134 dB |
Current | ≈ 1 μA | 3.5 μA | 1.1 μA | 11 μA | 11.1 μA | ≈ 2.5 mA |