Low-Noise Chopper-Stabilized Multi-Path Operational Amplifier with Nested Miller Compensation for High-Precision Sensors

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ID: 276642
2019
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Abstract
This paper presents a low-noise multi-path operational amplifier for high-precision sensors. A chopper stabilization technique is applied to the amplifier to remove offset and flicker noise. A ripple reduction loop (RRL) is designed to remove the ripple generated in the process of up-modulating the flicker noise and offset. To cancel the notch in the overall transfer function due to the RRL operation, a multi-path architecture using both a low-frequency path (LFP) and high-frequency path (HFP) is implemented. The low frequency path amplifier is implemented using the chopper technique and the RRL. In the high-frequency path amplifier, a class-AB output stage is implemented to improve the power efficiency. The transfer functions of the LFP and HFP induce a first-order frequency response in the system through nested Miller compensation. The low-noise multi-path amplifier was fabricated using a 0.18 µm 1P6M complementary metal-oxide-semiconductor (CMOS) process. The power consumption of the proposed low-noise operational amplifier is 0.174 mW with a 1.8 V supply and an active area of 1.18 mm2. The proposed low-noise amplifier has a unit gain bandwidth (UGBW) of 3.16 MHz, an input referred noise of 11.8 nV/√Hz, and a noise efficiency factor (NEF) of 4.46.
Reference Key
kim2019lownoiseapplied Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Kim, Jaesung;Kim, Hyungseup;Han, Kwonsang;You, Donggeun;Heo, Hyunwoo;Kwon, Yongsu;Cho, Dong-il “Dan”;Ko, Hyoungho;
Journal applied sciences
Year 2019
DOI
DOI not found
URL
https://www.mdpi.com/2076-3417/10/1/281
Keywords
chemistry Therapeutics. Pharmacology Biology (General) Medicine (General) Medicine Engineering (General). Civil engineering (General) Technology Science physics public aspects of medicine plant culture genetics

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