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 fRX for the overall RF bandpass filter from its nominal value fLO. The proposed architecture incorporates a notch filter at 2fLO to insure that there is no shift in fRX. 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.

[1]  Ralf Wunderlich,et al.  On I/Q-mismatch in active interference cancellation schemes , 2009, 2009 52nd IEEE International Midwest Symposium on Circuits and Systems.

[2]  J. Silva-Martinez,et al.  Design considerations of bandpass LC filters for RF applications , 2002, The 2002 45th Midwest Symposium on Circuits and Systems, 2002. MWSCAS-2002..

[3]  Ahmad Mirzaei,et al.  click on paper title to view Visual Supplement . Please click on paper title to view a Visual Supplement . , 2008 .

[4]  H. Darabi,et al.  A Blocker Filtering Technique for SAW-Less Wireless Receivers , 2007, IEEE Journal of Solid-State Circuits.

[5]  Edgar Sanchez-Sinencio,et al.  A 2.7-V 1.8-GHz fourth-order tunable LC bandpass filter based on emulation of magnetically coupled resonators , 2003, IEEE J. Solid State Circuits.

[6]  F. De Flaviis,et al.  Integrated Blocker Filtering RF Front Ends , 2007, 2007 IEEE Radio Frequency Integrated Circuits (RFIC) Symposium.

[7]  A.A. Abidi.  Evolution of a Software-Defined Radio Receiver's RF Front-End , 2006, IEEE Radio Frequency Integrated Circuits (RFIC) Symposium, 2006.

[8]  Stefan Heinen,et al.  Active feedback interference cancellation in RF receiver front-ends , 2009, 2009 IEEE Radio Frequency Integrated Circuits Symposium.