@inproceedings{010dce9321b040b1b632b7fae8492fab,
title = "A 180° Phase-Shifting CMOS Reflection Amplifier for 6G Active Reconfigurable Intelligent Surface",
abstract = "This paper proposes a CMOS reflection amplifier featuring 1-bit 180° phase-shifting functionality for 6G upper-mid band active reconfigurable intelligent surface (RIS) applications. By shifting the resonance frequency of the reflection amplifier through switch control, the proposed design achieves 1-bit 180° phase shifting without the need for an additional phase shifter circuit. In addition, the design parameters are carefully optimized to ensure unconditional stability across the entire frequency range. The amplifier achieves a simulated reflection gain of approximately 5.5 dB at an operating frequency of 15 GHz. Within a 200MHz bandwidth centered at 15GHz, the gain variation is about 0.6 dB while maintaining a nearly constant phase shift of 180°. The power consumption is approximately 4 mW from a 1 V supply voltage.",
keywords = "Phase shifting, reconfigurable intelligent surface (RIS), reflection amplifier, stability, upper-mid band",
author = "Euiseong Kim and Seokgyu Lee and Yaehoon Roh and Son, \{Hae Won\} and Kim, \{Jung Mu\} and Ilku Nam and Donggu Im",
note = "Publisher Copyright: {\textcopyright} 2025 IEEE.; 2025 Asia-Pacific Microwave Conference, APMC 2025 ; Conference date: 02-12-2025 Through 05-12-2025",
year = "2025",
doi = "10.1109/APMC65046.2025.11378721",
language = "English",
series = "Asia-Pacific Microwave Conference Proceedings, APMC",
publisher = "Institute of Electrical and Electronics Engineers Inc.",
booktitle = "APMC 2025 - 2025 Asia-Pacific Microwave Conference",
}