A Wearable Contactless Sensor Suitable for Continuous Simultaneous Monitoring of Respiration and Cardiac Activity

Table 1

Bill of material comparison.

Component type	ERB front-end mark I [18]	ERB front-end mark II
Instrumentation amplifier	4 (INA118)	1 (INA116)
Current bias generator	2 (REF200)	1 (REF200)
Operational amplifier	4 (OPA129)	None
Power supply	1 (DHC10512D)	1 (DHC10512D)
Passive resistors	12 (several different values)	1 (5 kΩ)
Capacitors	1 (2.2 µF); 2 (10 µF); 16 (100 nF)	1 (2.2 µF); 2 (10 µF); 2 (100 nF)
ERB	4 (1 m)	1 (1 m)