An integrated SAW-less narrowband RF front-end

In this paper an integrated SAW-less narrowband RF front-end for direct conversion wireless receivers is presented. The analysis of the feedback system shows a shift of the center frequency f
_RX
for the overall RF bandpass filter from its nominal value f
_LO
. The proposed architecture incorporates a notch filter at 2f
_LO
to insure that there is no shift in f
_RX
. The design has been implemented in 65nm CMOS process. It consumes 44mA from a single 1.2V supply. Simulation results show a rejection of more than 15dB in a bandwidth of +/-500MHz around 2GHz due to the additional feedback loop. The theoretical and simulation results are in close agreement.