A CMOS Wideband Variable Gain LNA with Novel Gain Control Method

Chen  Fei-Hua; Duo  Xin-Zhong; Sun  Xiao-Wei

doi:10.3724/SP.J.1146.2009.01418

Volume 32 Issue 11

Dec. 2010

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Chen Fei-Hua, Duo Xin-Zhong, Sun Xiao-Wei. A CMOS Wideband Variable Gain LNA with Novel Gain Control Method[J]. Journal of Electronics & Information Technology, 2010, 32(11): 2772-2775. doi: 10.3724/SP.J.1146.2009.01418

Citation:

Chen Fei-Hua, Duo Xin-Zhong, Sun Xiao-Wei. A CMOS Wideband Variable Gain LNA with Novel Gain Control Method[J]. Journal of Electronics & Information Technology, 2010, 32(11): 2772-2775. doi: 10.3724/SP.J.1146.2009.01418

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A CMOS Wideband Variable Gain LNA with Novel Gain Control Method

doi: 10.3724/SP.J.1146.2009.01418

Chen Fei-Hua^{①② 多新中},
Duo Xin-Zhong,
Sun Xiao-Wei

Received Date: 2009-11-02
Rev Recd Date: 2010-02-15
Publish Date: 2010-11-19

Abstract

Abstract

Multi-standard convergence for high speed ultra-wideband wireless communication leads the evolution for future RF devices. In this paper a CMOS wideband low noise amplifier (LNA) with novel gain control method is presented. In the first stage shunt-resistor feedback is used for wideband input matching, while for low noise performance noise cancelling circuit is adopted. A novel 6-bit digital programmable gain control circuit is exploited and adopted in the second stage for variable gain. Fabricated with SMIC 0.13m RF CMOS process, die area is 0.76mm2. Measured results show that the LNA operates in 1.1-1.8 GHz frequency band, and the maximum and minimum gain are 21.8 dB and 8.2 dB, 7 gain modes in all. Minimum noise figure is 2.7 dB. Typical IIP3 is -7 dBm.
- RF CMOS,
- Low Noise Amplifier (LNA),
- Noise cancelling,
- Wideband,
- Variable gain

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References

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