Journal
IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS
Volume 32, Issue 6, Pages 744-747Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LMWC.2022.3165151
Keywords
Dynamic range; Radio transmitters; Power generation; Dual band; Switches; Interpolation; Microwave imaging; 2-D digital predistortion (DPD); cartesian RF-DAC; digital transmitter; interpolater; narrowband-Internet-of-Things (NB-IoT); reconfigurable; SAW-less
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Funding
- Realtek Semiconductor Corporation, Hsinchu, Taiwan
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This letter presents a digital transmitter for NB-IoT applications, which achieves a large dynamic range, high-speed RF-DACs, and low power consumption. The transmitter incorporates integrated baluns and a reconfigurable interpolater to ensure efficient operation and meet the requirements of NB-IoT.
In this letter, we present a digital transmitter for dual-band narrowband-Internet-of-Things (NB-IoT) applications achieving a large dynamic range with high-speed cartesian RF-DACs requiring less area and consuming low power consumption. The proposed transmitter incorporates integrated output baluns, a reconfigurable digital interpolater-based oversampling for DAC image suppression, or avoidance of coexistence channel. A true SAW-less design is realized by external low-cost low-pass filtering of the spurious emission satisfying NB-IoT requirements. Implemented in standard 40-nm CMOS technology with a core area of 2.1 x 1.5 mm(2) and packaged with QFN-68, the transmitter achieves a dynamic range from -47.5 to 24.8 dBm with error vector magnitude (EVM) <-25 dB. The peak efficiency is 44.1% at 28.7-dBm output power, with a 2.4-V power supply.
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