收稿日期: 2012-03-09
修回日期: 2012-04-24
网络出版日期: 2012-04-24
基金资助
国家高技术研究发展计划(863计划)(2012AA012301)和国家自然科学基金(61106025)资助
A CMOS variable gain amplifier applying to WiMAX receiver
Received date: 2012-03-09
Revised date: 2012-04-24
Online published: 2012-04-24
实现了一种应用于WiMAX无线接收机中频部分的单级可变增益放大器.由于采用电流平方技术,该结构能以较少的级联数,实现系统所需的固定增益变化范围,以达到降低总功耗的目的.该电路采用0.13 μm CMOS工艺进行流片,总面积为0.6×0.4 mm2.测试结果表明,当控制电压从0.5 V变化到1 V时,VGA的增益变化范围为-20～25 dB,其3 dB带宽大于15 MHz,IIP3为-21～5 dBm,在1.2 V电源电压下功耗为3.6 mW.
关键词： WiMAX无线接收机; CMOS; 可变增益放大器; 电流平方
程心 , 杨海钢 , 高同强 , 尹韬 . 一种应用于WiMAX接收机的CMOS可变增益放大器[J]. 中国科学院大学学报, 2013 , 30(2) : 233 -237 . DOI: 10.7523/j.issn.1002-1175.2013.02.014
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
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