Please use this identifier to cite or link to this item: https://doi.org/10.1109/TCSI.2008.2010592
Title: A CMOS VGA with DC offset cancellation for direct-conversion receivers
Authors: Zheng, Y.
Yan, J.
Xu, Y.P. 
Keywords: dB-linear variable-gain amplifier (VGA)
DB-linear VGA
DC offset
Dc offset
Direct conversion receiver
Direct-conversion receiver
I/Q tuning
Pre-distortion compensation
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: Regular Papers 56 (1) : 103-113. ScholarBank@NUS Repository. https://doi.org/10.1109/TCSI.2008.2010592
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 0.35μm 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. © 2009 IEEE.
Source Title: IEEE Transactions on Circuits and Systems I: Regular Papers
URI: http://scholarbank.nus.edu.sg/handle/10635/53945
ISSN: 10577122
DOI: 10.1109/TCSI.2008.2010592
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