Welcome to Journal of University of Chinese Academy of Sciences,Today is

›› 2013, Vol. 30 ›› Issue (2): 233-237.DOI: 10.7523/j.issn.1002-1175.2013.02.014

Previous Articles     Next Articles

A CMOS variable gain amplifier applying to WiMAX receiver

CHENG Xin1,2, YANG Hai-Gang1, GAO Tong-Qiang1, YIN Tao1   

  1. 1. Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China;
    2. Graduate University, Chinese Academy of Sciences, Beijing 100049, China
  • Received:2012-03-09 Revised:2012-04-24 Online:2013-03-15

Abstract:

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

CLC Number: