Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/92153
Title: A CMOS VGA with DC offset cancellation for direct-conversion receivers
Authors: Zheng, Yuanjin
Yan, Jiangnan
Xu, Yong Ping
Keywords: DRNTU::Engineering::Electrical and electronic engineering
Issue Date: 2009
Source: Zheng, Y., Yan, J., & Xu, Y.P. (2009). A CMOS VGA with DC Offset Cancellation for Direct-Conversion Receivers. IEEE Transactions on Circuits and Systems—I. 56(1), 103-113.
Series/Report no.: IEEE transactions on circuits and systems—I
Abstract: A CMOS dB-linear variable gain amplifier (VGA) with a novel I/Q tuning loop for dc-offset cancellation is presented. The CMOS dB-linear VGA provides a variable gain of 60 dB while maintaining its 3-dB bandwidth greater than 2.5 MHz. A novel exponential circuit is proposed to obtain the dB-linear gain control characteristics. Nonideal effects on dB linearity are analyzed and the methods for improvement are suggested. A varying-bandwidth LPF is employed to achieve fast settling. The chip is fabricated in a 0.35-µm CMOS technology and the measurement results demonstrate the good dB linearity of the proposed VGA and show that the tuning loop can effectively remove dc offset and suppress I/Q mismatch effects simultaneously.
URI: https://hdl.handle.net/10356/92153
http://hdl.handle.net/10220/6276
ISSN: 1549-8328
DOI: http://dx.doi.org/10.1109/TCSI.2008.2010592
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Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:EEE Journal Articles

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