A novel notch filter LNA for use in multi-band, multi-standard cellular receivers

A novel LNA with integrated notch filter for multi-band, multi-standard cellular communication is presented in this paper. The LNA is capable to serve multiple FDD bands of the LTE standard and its cobanded UMTS counterparts. Due to its architecture also TDD bands including GSM bands DCS1900 and PCS1800 and LTE TDD bands can be covered. Due to the integrated notch filter which is reused for all covered bands external interstage filters can be omitted thus saving PCB area and component costs. Exemplary for LTE band II, simulations reveal a noise figure of 1.96 dB at 1930 MHz and 10.3 dB selectivity at 80 MHz duplex distance. The inband-IIP3 reaches -10.27 dBm, while IIP3_DPX = -10.4 dBm and IIP3H_DPX = -2.6 dBm. The circuit works from a 1.4 V supply, drawing 15.3 mA on a commercial 90 nm process.