Journal of University of Chinese Academy of Sciences >
A CMOS variable gain amplifier applying to WiMAX receiver
Received date: 2012-03-09
Revised date: 2012-04-24
Online published: 2012-04-24
A single-stage variable gain amplifier for WiMAX receiver is implemented. By adopting current squaring technique, the VGA provides a large variable gain range compared to other single-stage VGAs. As a result, the proposed structure can achieve a given variable gain range with less stages and the whole power consumption is reduced. The chip is fabricated in 0.13 μm CMOS process, occupies 0.6×0.4 mm2, and consumes 3.6 mW power from 1.2 V supply. Experimental results show that a continuous gain range from -20 dB to 25 dB is achieved when the control voltage varies from 0.5 V to 1 V. Furthermore, the VGA provides a 3 dB bandwidth greater than 15 MHz and the measured IIP3 value is in the range -21 dBm to 5 dBm.
Key words： WiMAX receivers; CMOS; variable gain amplifier; current squaring
CHENG Xin , YANG Hai-Gang , GAO Tong-Qiang , YIN Tao . A CMOS variable gain amplifier applying to WiMAX receiver[J]. Journal of University of Chinese Academy of Sciences, 2013 , 30(2) : 233 -237 . DOI: 10.7523/j.issn.1002-1175.2013.02.014
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