A Compact Variable Gain Amplifier With Continuous Time-Gain Compensation Using Systematic Predistorted Gain Control
- Authors
- Um, Ji-Yong
- Issue Date
- Feb-2022
- Publisher
- IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
- Keywords
- Variable gain amplifier; low area; continuous time-gain compensation; ultrasound imaging
- Citation
- IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS, v.69, no.2, pp.274 - 278
- Journal Title
- IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS
- Volume
- 69
- Number
- 2
- Start Page
- 274
- End Page
- 278
- URI
- https://scholarworks.bwise.kr/kumoh/handle/2020.sw.kumoh/20811
- DOI
- 10.1109/TCSII.2021.3090424
- ISSN
- 1549-7747
- Abstract
- This brief presents a compact variable gain amplifier (VGA) with continuous time-gain compensation (TGC) for ultrasound imaging. The proposed VGA utilizes an open-loop topology and transconductance-subtraction load for compact implementation with sufficient gain range. To compensate for gain nonlinearity of VGA, this work proposes a systematic predistortion of gain-control signal to enhance an accuracy of TGC operation. The proposed VGA implemented in 180-nm CMOS process occupies 0.025 mm(2), and consumes 0.96 mW for the maximum gain condition with a supply voltage of 1.8 V. A realtime continuous TGC has been illustrated in measurement. The fabricated VGA achieves a gain range of 37 dB, a gain error below 1.4 dB, and an input referred noise of 8.6 nV/root Hz for the maximum gain condition.
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Collections - Department of Medical IT Convergence Engineering > 1. Journal Articles
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