A 0.96-mW dB-Linear Variable Gain Amplifier With 0.4-dB Linearity Error Over a 62.4-dB Gain Tuning Range

Journal Article (2022)
Author(s)

Liying Cai (Zhejiang University)

Zhenghao Lu (Soochow University)

Zhong Tang (TU Delft - Electronic Instrumentation, Zhejiang University)

Xiao Peng Yu (Zhejiang University)

Research Group
Electronic Instrumentation
Copyright
© 2022 Liying Cai, Zhenghao Lu, Z. Tang, Xiaopeng Yu
DOI related publication
https://doi.org/10.1109/LSSC.2022.3213055
More Info
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Publication Year
2022
Language
English
Copyright
© 2022 Liying Cai, Zhenghao Lu, Z. Tang, Xiaopeng Yu
Research Group
Electronic Instrumentation
Bibliographical Note
Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public. @en
Volume number
5
Pages (from-to)
260-263
Reuse Rights

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Abstract

This letter presents a low-power dB-linear variable gain amplifier (VGA) with a small linear-in-dB error over a wide gain tuning range. An exponential current ratio is realized in the linear-in-dB control circuit based on the subthreshold I-V characteristic. The VGA is built with subthreshold common-gate transistors as current steering, accurately replicating the exponential current ratio and forming a tunable gain. Implemented in 55-nm CMOS technology, the proposed VGA occupies a compact active area of 0.011 mm2 excluding the buffer. It achieves a linear-in-dB error of 0.4 dB over a gain tuning range of 62.4 dB, corresponding to the state-of-the-art relative error of 0.6%. The proposed design shows constant 80-MHz bandwidth with a power consumption of 0.96 mW.

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