A receiver for LTE Rel-11 and beyond supporting non-contiguous carrier aggregation

Carrier aggregation (CA) is introduced in 3GPP LTE Rel-10 [1] to meet the demand for further increased bitrates. While LTE Rel-10 supports simultaneous reception of two carriers either in contiguous intra-band or in inter-band CA configuration, the upcoming LTE Rel-11 will add support for non-contiguous (NC) carriers within bands. Supporting NC CA in handsets is a demanding challenge for several reasons. Foremost, the total bandwidth spanned by the carriers may be several times the bandwidth of the individual carriers, possibly spanning an entire band with interfering signals between desired carriers. Furthermore, the distance between TX and RX carriers will vary and worse, may be much smaller than the fixed duplex distance for LTE Rel-8 and W-CDMA single carrier operation [2-5].

[1]  O. Oliaei,et al.  Single-Chip Multiband EGPRS and SAW-Less LTE WCDMA CMOS Receiver With Diversity , 2012, IEEE Transactions on Microwave Theory and Techniques.

[2]  Imad ud Din,et al.  Complex IF harmonic rejection mixer for non-contiguous dual carrier reception in 65 nm CMOS , 2012, 2012 Proceedings of the ESSCIRC (ESSCIRC).

[3]  Imad ud Din,et al.  A 4.75–34.75 MHz digitally tunable active-RC LPF for >60dB mean RX IRR in 65nm CMOS , 2012, 2012 Proceedings of the ESSCIRC (ESSCIRC).

[4]  Thomas Burger,et al.  A tri-band SAW-less WCDMA/HSPA RF CMOS transceiver with on-chip DC-DC converter connectable to battery , 2010, 2010 IEEE International Solid-State Circuits Conference - (ISSCC).

[5]  Lawrence E. Larson,et al.  A SAW-less CDMA receiver front-end with single-ended LNA and single-balanced mixer with 25% duty-cycle LO in 65nm CMOS , 2009, 2009 IEEE Radio Frequency Integrated Circuits Symposium.

[6]  Fang Min,et al.  A 1.2-V CMOS front-end for LTE direct conversion SAW-less receiver , 2011, 2011 IEEE International Symposium on Radio-Frequency Integration Technology.