A 19 nV/ $\surd$ Hz Noise 2- $\mu \text{V}$ Offset 75- $\mu \text{A}$ Capacitive-Gain Amplifier With Switched-Capacitor ADC Driving Capability
A 1.8 $\mu$ W 60 nV$/\surd$ Hz Capacitively-Coupled Chopper Instrumentation Amplifier in 65 nm CMOS for Wireless Sensor Nodes