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|Title:||A CMOS VGA with DC offset cancellation for direct-conversion receivers|
|Keywords:||dB-linear variable-gain amplifier (VGA)|
Direct conversion receiver
|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|
|Appears in Collections:||Staff Publications|
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