A 1.8 dB NF blocker-filtering noise-canceling wideband receiver with shared TIA in 40nm CMOS

This paper presents a high performance two-path wideband receiver (RX) for mobile applications. The RX uses an extra gain stage after the LNA to significantly improve the noise figure (NF). Furthermore, different RF and baseband blocker rejection techniques are proposed to significantly improve the linearity of the RX. The blockers are first rejected after the LNA stage through an N-path filter. Then, a novel base-band blocker filtering (BBBF) technique improves IIP3 by 7 dB. A dual mixer architecture is also employed to attenuate blockers both before and after the mixer stage. The N-path filter noise is sensed out-of-phase by the main path and cancelled at the inputs of the shared TIA. The RX achieves 1.8 dB NF with 50 dB gain at 2 GHz in 40nm CMOS technology. The RX out-of-band IIP3 is +5 dBm, which is improved by 20 dB by the proposed techniques, while consuming 36 mW.