A Low Power CMOS Low Noise Amplifier for Ultrawideband Wireless Applications

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A Low Power CMOS Low Noise Amplifier for
Ultra-wideband Wireless Applications

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• m93510021_at_mail.ntou.edu.tw

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Outline

• Abstract
• Introduction
• Design Concepts
• Implementation
• Simulation Results
• Conclusion
• References

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Abstract

• A CMOS low noise amplifier (LNA) for low-power
  ultra-wideband (UWB) wireless applications.
• To achieve low power consumption and wide
  operating bandwidth.
• LNA employing stagger tuning technique consists
  of two stacked common-source stages with
  different resonance frequencies.

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• 0.18µm CMOS process
• 2.6-9.2-GHz bandwidth
• maximum forward gain (S21) of 10.9 dB
• 1.8-V supply and 7.1 mW
• noise figure 3.5 dB
• IIP3 of 5.1 dBm

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Introduction

• UWB performs excellently for short-range
  high-speed uses
• Low power consumption
• The low noise amplifier (LNA) affect
• performance of signal bandwidth, noise figure,
  and power dissipation of the entire system

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• A feed-forward noisecanceling technique to
  minimize noise figure
• -3dB bandwidth is limited by device dimensions
• Difficult to achieve the frequency band
  requirement of UWB applications
• Serial resistor was used to improve the gain at
  low frequency

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Design Concepts
Noise performance
Coupling capacitor
Buffer
matching network at the input to resonate over
the entire frequency band
Hypass capacitor
Linearity
Input impedance matching
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• The minimum noise figure is give by
• Fmin the minimum noise factor
• ? frequency of interest
• ?T cutoff frequency
• ? the coefficients of drain noise
• d the coefficients of gate noise
• ? the correlation term

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By controlling the gain peak at the lower bound
of the frequency range, a very flat gain curve
can be obtained over wide bandwidth
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Implementation
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4.92pf
1000fF
2.5nH
0.9nH
4.3mA
4.92pf
1.8nH
350fF
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Simulation Results
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S11 , S22 , S21 and S12
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Noise figure
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Two-tone test and 1dB compression
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Conclusion
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References

• Chang-Ching Wu Mei-Fen Chou Wuen, W.-S.
  Kuei-Ann WenCircuits and Systems, 2005. ISCAS
  2005. IEEE International Symposium on23-26 May
  2005 Page(s)5063 - 5066 Digital Object
  Identifier 10.1109/ISCAS.2005.1465772

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• Thank You For Your Attention