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Received: 2002-05-03

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Journal of Zhejiang University SCIENCE A 2003 Vol.4 No.3 P.281-286


Noise and linearity optimization methods for a 1.9GHz low noise amplifier

Author(s):  GUO Wei, HUANG Da-quan

Affiliation(s):  Department of Information and Electronic Engineering, Zhejiang University, Hangzhou 310027, China

Corresponding email(s):   alohagw@isee.zju.edu.cn

Key Words:  RFIC, CMOS LNA, NF, noise, IP3, linearity

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GUO Wei, HUANG Da-quan. Noise and linearity optimization methods for a 1.9GHz low noise amplifier[J]. Journal of Zhejiang University Science A, 2003, 4(3): 281-286.

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T1 - Noise and linearity optimization methods for a 1.9GHz low noise amplifier
A1 - GUO Wei
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J0 - Journal of Zhejiang University Science A
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EP - 286
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DOI - 10.1631/jzus.2003.0281

noise and linearity performances are critical characteristics for radio frequency integrated circuits (RFICs), especially for low noise amplifiers (LNAs). In this paper, a detailed analysis of noise and linearity for the cascode architecture, a widely used circuit structure in LNA designs, is presented. The noise and the linearity improvement techniques for cascode structures are also developed and have been proven by computer simulating experiments. Theoretical analysis and simulation results showed that, for cascode structure LNAs, the first metallic oxide semiconductor field effect transistor (MOSFET) dominates the noise performance of the LNA, while the second MOSFET contributes more to the linearity. A conclusion is thus obtained that the first and second MOSFET of the LNA can be designed to optimize the noise performance and the linearity performance separately, without trade-offs. The 1.9GHz Complementary Metal-Oxide-Semiconductor (CMOS) LNA simulation results are also given as an application of the developed theory.

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