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Table 4 Comparison of the proposed instrument with commercial (portable and implantable) wireless biopotential acquisition systems

From: A high-performance 8 nV/√Hz 8-channel wearable and wireless system for real-time monitoring of bioelectrical signals

Parameters TMSI Mobita TMSI Mobi Activa PC + S This work
Number of channels 32 6 (+ 4) 2 5 (+ 3)
Type of biosignals ExG, body position and movement ExG, (+ temperature, respiration, body position and movement) LFP/ECoG ExG, ECoG, LFP, ERNA, body position and movement, PV ectopic activity (+ amperometric/potentiometric)
Supply of the ADC ±2 V ±2 V 1.7–2.2 V ±2.5 V
Voltage gain 20 dB 26 dB 48–66 dB 60 dB
Input voltage range ±200 mV ±100 mV ±500 μV to ±4.4 mV (for 2.2 V supply) ±2.3 mV
Maximum available bandwidth DC up to 0.13 × sample frequency 0.5–260 Hz 0.5–500 Hz
Input impedance >  100 MΩ >  100 MΩ 200 GΩ
Input referred noise <  0.4 μV rms (0.1–10 Hz) <  1 μV rms <  1 μV rms 0.169 μV rms (0.5–500 Hz)
DC tolerance ±85 mV
CMRR >  100 dB >  90 dB >  80 dB 134 dB
Maximum resolution of the ADC 24 bits 24 bits 10 bits 24 bits
Maximum sampling frequency 2000 SPS 2048 SPS 422 SPS 1 kSPS (32 kSPS for wired)
Hours of continuous operation 6 to 8 (4.1 Ah lithium battery) - (2 AA batteries) 8 (1 Ah lithium battery)
Wireless capability Yes (Wi-Fi) Yes (Bluetooth) Yes (175 kHz near-field inductive) Yes (Zigbee)
Area (length × width) 105 cm2 112 cm2 39 cm2 44 cm2 (PCB area)