JSTS:Journal of Semiconductor Technology and Science

The Institute of Electronics and Information Engineers (대한전자공학회)
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A Transimpedance Amplifier Employing a New DC Offset Cancellation Method for WCDMA/LTE Applications

  • Lee, Cheongmin (The authors are with the Department of Electronics Engineering, Kangwon National University) ;
  • Kwon, Kuduck (The authors are with the Department of Electronics Engineering, Kangwon National University)
  • Received : 2016.04.27
  • Accepted : 2016.07.19
  • Published : 2016.12.30
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Abstract

In this paper, a transimpedance amplifier based on a new DC offset cancellation (DCOC) method is proposed for WCDMA/LTE applications. The proposed method applies a sample and hold mechanism to the conventional DCOC method with a DC feedback loop. It prevents the removal of information around the DC, so it avoids signal-to-noise ratio degradation. It also reduces area and power consumption. It was designed in a $0.13{\mu}m$ deep n-well CMOS technology and drew a maximum current of 1.58 mA from a 1.2 V supply voltage. It showed a transimpedance gain of $80dB{\Omega}$, an input-referred noise current lower than 0.9 pA/${\surd}$Hz, an out-of-band input-referred 3rd-order intercept point more than 9.5 dBm, and an output DC offset lower than 10 mV. Its area is $0.46mm{\times}0.48mm$.

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References

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