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An Ultra-low Voltage UWB CMOS
Low Noise Amplifier
Yueh-Hua Yu, Yi-Jan Emery Chen, and Deukhyoun Heo*
Department of Electrical Engineering, National Taiwan University,
Taipei, Taiwan
Presenter: Chun-Han Hou ( 侯 鈞 瀚)
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Abstract
1.This paper presents an ultra-low voltage UWB LNA in a commercial 0.18μm CMOS technology
2. The technique of inductive degeneration is used in a two-stage conventional distributed
amplifier to achieve broadband and low noise.
3. The common source single-stage amplifier is cascaded to the conventional distributed
amplifier to improve the gain at high frequency.
4. The measured
a.gain of the integrated LNA is 10dB
b.3dB bandwidth from 2.7 to 9.1 GHz
c. average noise figure is 4.65dB
d.the IIP3 is 0dBm
e.Operated at 0.6V
f. The UWB CMOS LNA consumes 7mW
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Outline
1.Introduction
2.LNA Design
3.Noise Reduction
4.Measurement Result
5.Conclusion
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Introduction
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LNA Design
The integrated UWB CMOS LNA is composed of a two stage
conventional distributed amplifier (CDA) and a
common-source single-stage amplifier (CSSA) in cascade.
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LNA Design
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Noise Reduction
1.Inductive degeneration is the technique widely used in
the tuned LNA design.
2. This technique is applied to the design of every stage of
the CDA.
3.Adding source-degeneration inductor improves the noise
characteristic of the single stage in the CDA.
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Measurements
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Measurements
Ps. . The integrated LNA achieves 10dB gain for 3dB bandwidth
from 2.7GHz to 9.1GHz.
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Measurements
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Measurements
Ps.Distributed amplifiers usually have good input and output return
losses
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Measurements
[2]A.Bevilacqua and A.Niknejad, “An Ultra-Wideband CMOS LNA for 3.1 to 10.6GHz Wireless Receivers,” ISSCC Dig. Tech.
Papers, vol. 1, pp. 384 – 385, Feb. 2004.
[6]Chang-Wan Kim, et al., “An ultra-wideband CMOS low noise amplifier for 3-5-GHz UWB system,” Journal of solid
state of circuit, vol. 40, pp. 544-547, Feb. 2005.
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Conclusion
1. An ultra-low voltage UWB LNA was developed in a commercial 0.18μm CMOS
technology.
2.Inductor degeneration technique is applied to the conventional distributed amplifier
design for the first time to improve broadband noise characteristic.
3. A common-source single-stage amplifier is cascaded to the CDA to improve the gain
for low voltage operation.
4. The integrated LNA achieves 10dB gain and 4.65dB average noise figure for the 3-dB
bandwidth from 2.7GHz to 9.1GHz.
5. Operated with a 0.6V power supply, the UWB CMOS LNA consumes only 7 mW.
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