A 192nW inverter-based chopper instrumentation amplifier for micropower ECG applications

Author

Shi Wang ; Yixiao Wang ; Long Chen ; Jiayi Wang ; Xiaozhe Liu ; Le Ye ; Ru Huang ; Huailin Liao

Author_Institution

Shenzhen Grad. Sch., Peking Univ., Shenzhen, China

fYear

2014

fDate

28-31 Oct. 2014

Firstpage

1

Lastpage

3

Abstract

This paper proposes a low-power inverter-based chopper instrumentation amplifier (IA) for ECG applications. A capacitively-coupled topology with chopper is employed while a two-stage inverter-based amplifier serves as the gain stage. Pseudo resistors are introduced to stabilize the output common-mode voltage of the amplifier and an improved switch-capacitor integrator with resistive attenuator is designed for the DC offset canceling (DCOC) loop. The instrumentation amplifier is implemented in a standard 0.18μm CMOS process. Simulation results show that the input referred noise is 1.28 μVrms ranging from 1Hz to 110Hz while consuming 192nW with a 1.2V supply.

Keywords

CMOS integrated circuits; amplifiers; biomedical electronics; choppers (circuits); circuit layout; electrocardiography; invertors; switched capacitor networks; CMOS process; DC offset canceling loop; DCOC loop; capacitively-coupled topology; frequency 1 Hz to 110 Hz; gain stage; inverter-based chopper instrumentation amplifier; low-power inverter; micropower ECG applications; output common-mode voltage; power 192 nW; pseudoresistors; resistive attenuator; size 0.18 mum; switch-capacitor integrator; voltage 1.2 V; Abstracts; Attenuators; Electrocardiography; Electronic mail; Frequency locked loops; Instruments; Switches;

fLanguage

English

Publisher

ieee

Conference_Titel

Solid-State and Integrated Circuit Technology (ICSICT), 2014 12th IEEE International Conference on

Conference_Location

Guilin

Print_ISBN

978-1-4799-3296-2

Type

conf

DOI

10.1109/ICSICT.2014.7021368

Filename

7021368