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Low-Power Low-Noise Amplifier Using Attenuation-Adaptive Noise Control for Ultrasound Imaging Systems

Title
Low-Power Low-Noise Amplifier Using Attenuation-Adaptive Noise Control for Ultrasound Imaging Systems
Author
권오경
Keywords
Input referred noise; low-noise amplifier (LNA); low-power; noise efficiency factor; ultrasound attenuation; ultrasound imaging
Issue Date
2017-02
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Citation
IEEE TRANSACTIONS ON BIOMEDICAL CIRCUITS AND SYSTEMS, v. 11, no. 1, page. 108-116
Abstract
This paper presents a low-noise amplifier (LNA) using attenuation-adaptive noise control (AANC) for ultrasound imaging systems. The proposed AANC reduces unnecessary power consumption of the LNA, which arises from useless noise floor, by controlling the noise floor of the LNA with respect to the attenuation of the ultrasound. In addition, a current feedback amplifier with a source-degenerated input stage reduces variations of the bandwidth and the closed loop gain, which are caused by the AANC. The proposed LNA was fabricated using a 0.18-mu m CMOS process. The input-referred voltage noise density of the fabricated LNA is 1.01 nV/v Hz at the frequency of 5 MHz. The second harmonic distortion is -53.5 dB when the input signal frequency is 5 MHz and the output voltage swing is 2 V-pp. The power consumption of the LNA using the AANC is 16.2 mW at the supply voltage of 1.8 V, which is reduced to 64% of that without using the AANC. The noise efficiency factor (NEF) of the proposed LNA is 3.69, to our knowledge, which is the lowest NEF compared with previous LNAs for ultrasound imaging.
URI
https://ieeexplore.ieee.org/document/7497601http://repository.hanyang.ac.kr/handle/20.500.11754/112851
ISSN
1932-4545; 1940-9990
DOI
10.1109/TBCAS.2016.2552246
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ELECTRONIC ENGINEERING(융합전자공학부) > Articles
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