an ultra-low power ecg chopper amplifier with inverter stacking for noise efficiency enhancement
Name: Somok Mondal
Grad Year: 2019
An ultra-low power chopper-stabilized amplifier intended for portable or implantable ECG applications is presented. A new technique to fundamentally improve the noise efficiency of such amplifiers is introduced that is based on Gm-boosting by AC-coupling up-modulated signals onto stacked inverters. Designed and fabricated in a 180nm CMOS process, the amplifier consumes 23 nW from a 1.4 V supply. An efficient current-reuse and better utilization of the supply voltage using the proposed technique by stacking three inverters leads to a best-reported Noise Efficiency Factor (NEF) of 0.88 and Power Efficiency Factor (PEF) of 1.08.
Industry Application Area(s)
Electronics/Photonics | Life Sciences/Medical Devices & Instruments | Semiconductor