JSTS:Journal of Semiconductor Technology and Science

The Institute of Electronics and Information Engineers (대한전자공학회)
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An Inherently dB-linear All-CMOS Variable Gain Amplifier

  • Kwon, Ji-Wook (Dep. EE., Korea Advance Institutes Science and Technology) ;
  • Ryu, Seung-Tak (Dep. EE., Korea Advance Institutes Science and Technology)
  • Received : 2011.07.28
  • Published : 2011.12.31
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Abstract

This paper introduces a simple variable gain amplifier (VGA) structure that shows an inherently dB-linear gain control property. Requiring no additional components for dB-linear control, the structure is compact and power efficient. The designed two-stage VGA shows a gain control range of 60dB with the gain error in the range of ${\pm}0.4$ dB. The power consumption including the output buffer is 20.4 mW from 1.2 V supply voltage with bandwidth of 630 MHz. The prototype was fabricated in a 0.13 ${\mu}m$ CMOS process and the VGA core occupies 0.06 $mm^2$.

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References

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