A multiband multistandard notch filter LNA for LTE, WCDMA and GSM for SAW-less frontends

A notch filter LNA for multiband multistandard cellular communication is presented. The circuit is capable of serving multiple FDD bands of the LTE standard and its cobanded WCDMA/UMTS counterparts. Due to its architecture also TDD bands, including GSM bands DCS1900, PCS1800 and the LTE TDD, can be covered. This is achieved without an additional off-chip interstage filter and LNA. The circuit has been fabricated on a commercial 90 nm technology and works from 1.4 V supply voltage. In FDD mode it draws less than 16 mA and in TDD mode less than 7 mA, respectively. For LTE band 2 (TX: 1850 - 1910 MHz, 80 MHz duplex distance) a noise figure of 3.6 dB is not exceeded at 20.4 dB gain. The 1-dB-desensitization point is -21 dBm, IIP3_DPX = -12.3 dBm, and IIP3_HDPX = -5.2 dBm while the filter attenuates a 3 MHz TX signal by 14.3 dB.