Cross modulation interference in CDMA RF receiver
Zhe Li · 2012
The nonlinearity of LNA(low noise amplifier) which have caused the problem of cross modulation interference in CDMA(Code Division Multiple Access) RF receiver is studied.Based on the CDMA cell phone,simultaneously using CDMA single-tone desensitization test,the factors which trigger the interference are qualitatively analyzed,simultaneously the wanted IIP3(input third-order intercept point) of LNA for CDMA cellular is designed: +7.8 dBm.Making use of the IP3 test,the agreement between the calculation and the actual value is verified.The results showed that the IIP3 of LNA determined the cross modulation interference.The smaller the product to make,the greater IIP3 value we need.