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Power spectrum analysis of the cross/intermodulation in the nonlinear LNA

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3 Author(s)
Heung-Gyoon Ryu ; Dept. of Electron. Eng., Chungbuk Nat. Univ. ; Heui Seop Byeon ; Jin Kwan Kim

This study deals with the effects of the cross/intermodulation (CM/IM) on the communication performance when both Tx (transmit) leakage and external single tone interference pass through LNA in code division multiple access (CDMA)/frequency division duplex (FDD) transceiver. The CM/IM powers happen because of the nonlinearity of the LNA and these get work as interference to the desired signal. The CM/IM interference powers are analyzed with the frequency change of external single tone interference in Rx (receive) band. The relationship between these interference powers, input third-order intercept point (IIP3), and the dependence of the allowable noise figure (NF allowable) on the IIP3 are presented in this study. If IIP3 is large enough for CM/IM interference power spectrum slightly to overlap with the Rx band, the interference power in Rx band gets smaller but NFallowable increases as IIP3 is increased. Thus, the bit-error-rate (BER) performance is degraded. On the other hand, when the interference power spectrum largely overlaps with the Rx band, it is important to increase the IIP 3 to get the better BER performance since the performance improvement by the linearity growth is larger than the performance degradation caused by the increment of NFallowable

Published in:

Vehicular Technology, IEEE Transactions on  (Volume:55 ,  Issue: 3 )