2025-07-29 マサチューセッツ工科大学 (MIT)
Researchers designed a transmitter chip that significantly improves energy efficiency of wireless communications, which could boost the range and battery life of a connected device. Credit: iStock
＜関連情報＞
- https://news.mit.edu/2025/new-transmitter-could-make-wireless-devices-more-energy-efficient-0729
- https://ieeexplore.ieee.org/document/11082855
時間交差型多サブハーモニックスイッチングDPAを用いた完全統合型最適モジュレーションビットからRFデジタル送信機 A Fully Integrated Optimal Modulation Bits-to-RF Digital Transmitter using Time-Interleaved Multi-Subharmonic-Switching DPA
Timur Zirtiloglu; Arman Tan; Basak Ozaydin; Ken Duffy; Muriel Medard; Rabia Tugce Yazicigil
2025 IEEE Radio Frequency Integrated Circuits Symposium Date Added to IEEE Xplore: 24 July 2025
DOI:https://doi.org/10.1109/RFIC61188.2025.11082855
Abstract
A fully integrated bits-to-RF transmitter featuring deep power back-off (PBO) enhancements is demonstrated, incorporating a time-interleaved multi-subharmonic-switching digital power amplifier (DPA) and a harmonic-rejection digital-to-phase converter (DPC). This architecture also employs a non-uniform Optimal Modulation (OM) constellation to enhance the transmission error rate. The system implemented in 65 nm CMOS achieves 58.1% peak power-added efficiency (PAE) and 52% peak system efficiency (SE) with 22.7 dBm peak output power, using 2.6 and 1.3 V VDDs. Dynamic measurements of a 64-point OM constellation achieved 23.1% PAE and 19.4% SE at 16.9 dBm average output power, while maintaining an EVM of –29.9 dB at 1.5 GHz carrier frequency. Compared to standard QAM, the proposed OM scheme reduces the bit error rate (BER) by 2.4× and the symbol error rate (SER) by 4.5×, demonstrating its suitability for high-efficiency and reliable signal transmission.
