An inductor-less LTE receiver using an 8-path filter for TX leakage suppression

In this paper, an inductor-less mobile radio receiver is proposed. An 8-path band pass filter is employed at the input of the receiver to provide TX leakage suppression. The receiver is designed for LTE and UMTS lower bands and tested for worst case duplex distance of 32 MHz. The filter can be programmed to trade the noise degradation for TX suppression. For 0.3 dB noise degradation, IIP2 and IIP3 improvements can reach 17 and 11 dB respectively. The receiver has been fabricated in a 28 nm CMOS technology.

[1]  Ahmad Mirzaei,et al.  A 65 nm CMOS Quad-Band SAW-Less Receiver SoC for GSM/GPRS/EDGE , 2011, IEEE Journal of Solid-State Circuits.

[2]  Eric A. M. Klumperink,et al.  Tunable High-Q N-Path Band-Pass Filters: Modeling and Verification , 2011, IEEE Journal of Solid-State Circuits.

[3]  Eric A. M. Klumperink,et al.  Low-Jitter Multi-phase Clock Generation: A Comparison between DLLs and Shift Registers , 2007, 2007 IEEE International Symposium on Circuits and Systems.

[4]  I. W. Sandberg,et al.  An alternative approach to the realization of network transfer functions: The N-path filter , 1960 .

[5]  Lawrence E. Larson,et al.  An Active Transmitter Leakage Suppression Technique for CMOS SAW-Less CDMA Receivers , 2010, IEEE Journal of 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]  Robert Weigel,et al.  An interstage filter-free mobile radio receiver with integrated TX leakage filtering , 2010, 2010 IEEE Radio Frequency Integrated Circuits Symposium.