Research on optimizing the noise figure of low noise amplifier method via bias and frequency

doi:10.1016/S1005-8885(10)60093-3

Acta Metallurgica Sinica(English letters) ›› 2011, Vol. 18 ›› Issue (4): 118-122.doi: 10.1016/S1005-8885(10)60093-3

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Research on optimizing the noise figure of low noise amplifier method via bias and frequency

Lijun Zhang¹,Li-Nan LI

Received:2010-12-29 Revised:2011-05-31 Online:2011-08-31 Published:2011-08-24
Contact: Li-Nan LI E-mail:lnli@bjtu.edu.cn

Abstract

Abstract:

In this paper, we present the design of an integrated low noise amplifier (LNA) for wireless local area network (WLAN) applications in the 5.15–5.825 GHz range using a SiGe BiCMOS technology. A novel method that can determine both the optimum bias point and the frequency point for achieving the minimum noise figure is put forward. The method can be used to determine the optimum impedance over a relevant wider operating frequency range. The results show that this kind of optimizing method is more suitable for the WLAN circuits design. The LNA gain is optimized and the noise figure (NF) is reduced. This method can also achieve the noise match and power match simultaneously. This proposal is applied on designing a LNA for IEEE 802.11a WLAN. The LNA exhibits a power gain large than 16 dB from 5.15 to 5.825 GHz range. The noise figure is lower than 2 dB. The OIP3 is 8 dBm. Also the LNA is matched to 50 Ω input impedance with 6 mA DC current for differential design.

Key words:

LNA, SiGe BiCMOS, noise figure, WLAN

CLC Number:

Lijun Zhang Li-Nan LI. Research on optimizing the noise figure of low noise amplifier method via bias and frequency[J]. Acta Metallurgica Sinica(English letters), 2011, 18(4): 118-122.

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