A 0.6V, 700nW Chopper Capacitively-Coupled Instrumentation Amplifier for Biomedical Applications

This work presents the analysis and design of a CMOS capacitively-coupled instrumentation amplifier (CCIA). The amplifier has a gain of 40 dB for frequencies up to 100 Hz with ultra-low power consumption, thus being suitable for portable health monitoring devices. The reduction of power consumption is achieved by biasing the MOSFETs of the circuit in the subthreshold region. Chopper stabilization is employed to eliminate the dominant low-frequency noise. The CCIA is implemented by means of Cadence ^® Custom IC Design Tool in TSMC 0.18 μm process.