J. Semicond. > 2010, Volume 31 > Issue 2 > 025003

SEMICONDUCTOR INTEGRATED CIRCUITS

A 0.18 μm CMOS 3–5 GHz broadband flat gain low noise amplifier

Feng Lisong, Huang Lu, Bai Xuefei and Xi Tianzuo

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DOI: 10.1088/1674-4926/31/2/025003

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Abstract: A 3–5 GHz broadband flat gain differential low noise amplifier (LNA) is designed for the impulse radio ultra-wideband (IR-UWB) system. The gain-flatten technique is adopted in this UWB LNA. Serial and shunt peaking techniques are used to achieve broadband input matching and large gain-bandwidth product (GBW). Feedback networks are introduced to further extend the bandwidth and diminish the gain fluctuations. The prototype is fabricated in the SMIC 0.18 μm RF CMOS process. Measurement results show a 3-dB gain bandwidth of 2.4–5.5 GHz with a maximum power gain of 13.2 dB. The excellent gain flatness is achieved with 0.45 dB gain fluctuations across 3–5 GHz and the minimum noise figure (NF) is 3.2 dB over 2.5–5 GHz. This circuit also shows an excellent input matching characteristic with the measured S11 below –13 dB over 2.9–5.4 GHz. The input-referred 1-dB compression point (IP1dB) is –11.7 dBm at 5 GHz. The differential circuit consumes 9.6 mA current from a supply of 1.8 V.

Key words: LNA differential UWB flat gain feedback

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    Feng Lisong, Huang Lu, Bai Xuefei, Xi Tianzuo. A 0.18 μm CMOS 3–5 GHz broadband flat gain low noise amplifier[J]. Journal of Semiconductors, 2010, 31(2): 025003. doi: 10.1088/1674-4926/31/2/025003
    Feng L S, Huang L, Bai X F, Xi T Z. A 0.18 μm CMOS 3–5 GHz broadband flat gain low noise amplifier[J]. J. Semicond., 2010, 31(2): 025003. doi: 10.1088/1674-4926/31/2/025003.
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    Received: 18 August 2015 Revised: 14 September 2009 Online: Published: 01 February 2010

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      Feng Lisong, Huang Lu, Bai Xuefei, Xi Tianzuo. A 0.18 μm CMOS 3–5 GHz broadband flat gain low noise amplifier[J]. Journal of Semiconductors, 2010, 31(2): 025003. doi: 10.1088/1674-4926/31/2/025003 ****Feng L S, Huang L, Bai X F, Xi T Z. A 0.18 μm CMOS 3–5 GHz broadband flat gain low noise amplifier[J]. J. Semicond., 2010, 31(2): 025003. doi: 10.1088/1674-4926/31/2/025003.
      Citation:
      Feng Lisong, Huang Lu, Bai Xuefei, Xi Tianzuo. A 0.18 μm CMOS 3–5 GHz broadband flat gain low noise amplifier[J]. Journal of Semiconductors, 2010, 31(2): 025003. doi: 10.1088/1674-4926/31/2/025003 ****
      Feng L S, Huang L, Bai X F, Xi T Z. A 0.18 μm CMOS 3–5 GHz broadband flat gain low noise amplifier[J]. J. Semicond., 2010, 31(2): 025003. doi: 10.1088/1674-4926/31/2/025003.

      A 0.18 μm CMOS 3–5 GHz broadband flat gain low noise amplifier

      DOI: 10.1088/1674-4926/31/2/025003
      • Received Date: 2015-08-18
      • Accepted Date: 2009-07-29
      • Revised Date: 2009-09-14
      • Published Date: 2010-01-27

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