J. Semicond. > 2012, Volume 33 > Issue 8 > 085003

SEMICONDUCTOR INTEGRATED CIRCUITS

A 10-Gb/s inductor-less variable gain amplifier with a linear-in-dB characteristic and DC-offset cancellation

Liu Chang, Yan Yuepeng, Goh Wang-Ling, Xiong Yongzhong, Zhang Lijun and Mohammad Madihian

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DOI: 10.1088/1674-4926/33/8/085003

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Abstract: This paper presents a broadband inductor-less variable gain amplifier (VGA) with a linear-in-dB gain control characteristic and DC-offset cancellation. The proposed VGA is composed of a variable gain block, an exponential voltage generator, a DC-offset canceller with common-mode voltage correction, and a gain peaking block. To achieve the broad band and reduce the chip area, the gain peaking block employs an inductor-less gain peaking scheme to compensate the high frequency gain drop of the variable gain block and the DC-offset canceller. The VGA fabricated in 0.13 μm SiGe BiCMOS technology achieves a 3-dB bandwidth of 7.5 GHz and a variable gain range from -10 to 30 dB. Due to the inductor-less design, the die area is only 0.53 × 0.27 mm2 which is the smallest among other similar reported works. At 10-Gb/s, the VGA consumes 50 mW power from a single 1.2 V supply and exhibits an output data jitter of less than 30 pspp.

Key words: VGA

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    Received: 20 August 2015 Revised: 10 April 2012 Online: Published: 01 August 2012

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      Liu Chang, Yan Yuepeng, Goh Wang-Ling, Xiong Yongzhong, Zhang Lijun, Mohammad Madihian. A 10-Gb/s inductor-less variable gain amplifier with a linear-in-dB characteristic and DC-offset cancellation[J]. Journal of Semiconductors, 2012, 33(8): 085003. doi: 10.1088/1674-4926/33/8/085003 ****Liu C, Yan Y P, Goh W, Xiong Y Z, Zhang L J, Mohammad M. A 10-Gb/s inductor-less variable gain amplifier with a linear-in-dB characteristic and DC-offset cancellation[J]. J. Semicond., 2012, 33(8): 085003. doi: 10.1088/1674-4926/33/8/085003.
      Citation:
      Liu Chang, Yan Yuepeng, Goh Wang-Ling, Xiong Yongzhong, Zhang Lijun, Mohammad Madihian. A 10-Gb/s inductor-less variable gain amplifier with a linear-in-dB characteristic and DC-offset cancellation[J]. Journal of Semiconductors, 2012, 33(8): 085003. doi: 10.1088/1674-4926/33/8/085003 ****
      Liu C, Yan Y P, Goh W, Xiong Y Z, Zhang L J, Mohammad M. A 10-Gb/s inductor-less variable gain amplifier with a linear-in-dB characteristic and DC-offset cancellation[J]. J. Semicond., 2012, 33(8): 085003. doi: 10.1088/1674-4926/33/8/085003.

      A 10-Gb/s inductor-less variable gain amplifier with a linear-in-dB characteristic and DC-offset cancellation

      DOI: 10.1088/1674-4926/33/8/085003
      • Received Date: 2015-08-20
      • Accepted Date: 2012-01-06
      • Revised Date: 2012-04-10
      • Published Date: 2012-07-27

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