A 0.65μW 70nV/rtHz capacitively-coupled chopper instrumentation amplifier for bio-potential sensing in 28-nm CMOS
- Resource Type
- Conference
- Authors
- Jiang, Yuli; Zuo, Wenfei; Zheng, Jiawei; Cheng, Lin
- Source
- 2020 IEEE International Conference on Integrated Circuits, Technologies and Applications (ICTA) Integrated Circuits, Technologies and Applications (ICTA), 2020 IEEE International Conference on. :47-48 Nov, 2020
- Subject
- Communication, Networking and Broadcast Technologies
Components, Circuits, Devices and Systems
Instruments
Simulation
Cutoff frequency
Choppers (circuits)
Sensors
Servomotors
Transconductance
bio-potential sensing
instrumentation amplifier(L4)
pseudo-resistor (PR)
DC servo loop(DSL)
chopping
stacking
low power
noise efficiency
- Language
A low-power low-noise capacitively-coupled chopper instrumentation amplifier (CCIA) using stacked transconductance amplifiers (OTAs) for bio-potential sensing is presented. It utilizes stacked OTAs as the first stage for noise and power efficiency optimization. A DC servo loop is added to eliminate the DC electrode offset, and pseudo-resistors are designed to realize high-pass filters with ultra-low cut-off frequency without using large capacitors. The CCIA was designed in a 2Snm CMOS process, occupying a chip area of 0.15mm 2 . It consumes 0.65$\mu$A current under 1-V supply. Simulation results indicate that the input-referred noise is 70nV/rtHz and the noise efficiency factor is 2.7.