Journal
IEEE JOURNAL OF SOLID-STATE CIRCUITS
Volume 57, Issue 12, Pages 3646-3655Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSSC.2022.3212375
Keywords
Receivers; Radio frequency; Mixers; Transformers; Interference; 5G mobile communication; Radiofrequency integrated circuits; Carrier Aggregation; cellular radio frequency (RF) receiver (RX); digital-intermediate frequency (IF); digital super-heterodyne; E-UTRA NR dual connectivity (EN-DC); software-defined-radio (SDR); sub-6 GHz new radio (NR)
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The world's first 5-carrier aggregation using digital-intermediate frequency receiver is presented, which supports 5G sub-6 GHz new radio and maintains 2G and 3G. The integration of three digital-IF RXs with a shared local oscillator-phase-locked loop reduces power consumption and area. The estimated power saving by sharing a single LO-PLL is 17%.
The world's first 5-carrier aggregation (CA) supporting digital-intermediate frequency (IF) receiver (RX) to support 5G sub- 6 GHz new radio (NR) and CA/E-UTRA NR dual connectivity (CA/EN-DC) maintaining 2G and 3G in 14-nm FinFET CMOS technology is presented. Three digital-IF RXs with a shared local oscillator-phase-locked loop (LO-PLL) are integrated for supporting inter-/intra-band 5-CA to reduce power consumption and area of the massive number of RX paths. The RX features nine single-ended low-noise amplifiers (LNAs) with low/mid/high band (L/M/HB) characteristics. It achieves noise figure (NF) of 1.5 dB with 18 dB external LNA gain and +7.6-dBm out-of-band (OOB) input intercept point 3 (IIP3), and input intercept point 2 (IIP2) calibration is not required thanks to IF planning. The RX achieves an error vector magnitude (EVM) of 2.5% by intra-4CA for B1 LTE10MHz and LTE20MHz in one single RX path, as well as inter-3CA for B3, B5, and B7 long-term evolution (LTE) 20 MHz with a shared LO-PLL. The estimated power saving by sharing a single LO-PLL is 17% compared to 3-CA RXs with three separate LO-PLLs.
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