A Ku-band CMOS Variable-Gain Phase Shifter for Upper Mid-Band 6G Communication

Eunchae Jo; Mingyu Lee; Haram Park; Hyeonwon Song; Eunsu Mo; Seunghun Wang; Huidong Lee; Bonghyuk Park; Seungchan Lee; Jinseok Park

doi:10.1109/APMC65046.2025.11379728

A Ku-band CMOS Variable-Gain Phase Shifter for Upper Mid-Band 6G Communication

Eunchae Jo
, Mingyu Lee
, Haram Park
, Hyeonwon Song
, Eunsu Mo
, Seunghun Wang
, Huidong Lee
, Bonghyuk Park
, Seungchan Lee
, Jinseok Park

Electronic Engineering Program

Chonnam National University
Electronics and Telecommunications Research Institute

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

Abstract

This paper presents a 13.8-20.7 GHz variable-gain phase shifter (VGPS) for upper mid-Band 6G communication, fabricated in a 65-nm RF CMOS process. The proposed VGPS incorporates a loading effect-resilient I/Q signal generator, an impedance-invariant vector summer, an interstage matching network, a digital-to-analog converter (DAC), and a quadrant selection DPDT switch. The interconnection between the I/Q generator and the vector summer is impedance-matched to minimize reflection and improve the gain of the VGPS. The VGPS supports 6-bit phase and 7-bit gain control. Measurement results demonstrate a maximum insertion loss of -4.5 dB, with RMS phase and gain errors of 1.87° and 0.5 dB, respectively, across the operating frequency range.

Original language	English
Title of host publication	APMC 2025 - 2025 Asia-Pacific Microwave Conference
Publisher	Institute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)	9798331534554
DOIs	https://doi.org/10.1109/APMC65046.2025.11379728
State	Published - 2025
Event	2025 Asia-Pacific Microwave Conference, APMC 2025 - Jeju Island, Korea, Republic of Duration: 2 Dec 2025 → 5 Dec 2025

Publication series

Name	Asia-Pacific Microwave Conference Proceedings, APMC
ISSN (Electronic)	2690-3946

Conference

Conference	2025 Asia-Pacific Microwave Conference, APMC 2025
Country/Territory	Korea, Republic of
City	Jeju Island
Period	2/12/25 → 5/12/25

Keywords

CMOS
impedance invariant vector summer
inter-stage matching
loading effect
VGPS

Access to Document

10.1109/APMC65046.2025.11379728

Cite this

Jo, E., Lee, M., Park, H., Song, H., Mo, E., Wang, S., Lee, H., Park, B., Lee, S., & Park, J. (2025). A Ku-band CMOS Variable-Gain Phase Shifter for Upper Mid-Band 6G Communication. In APMC 2025 - 2025 Asia-Pacific Microwave Conference (Asia-Pacific Microwave Conference Proceedings, APMC). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/APMC65046.2025.11379728

@inproceedings{f10aeca33a5042efba83767d95202ada,

title = "A Ku-band CMOS Variable-Gain Phase Shifter for Upper Mid-Band 6G Communication",

abstract = "This paper presents a 13.8-20.7 GHz variable-gain phase shifter (VGPS) for upper mid-Band 6G communication, fabricated in a 65-nm RF CMOS process. The proposed VGPS incorporates a loading effect-resilient I/Q signal generator, an impedance-invariant vector summer, an interstage matching network, a digital-to-analog converter (DAC), and a quadrant selection DPDT switch. The interconnection between the I/Q generator and the vector summer is impedance-matched to minimize reflection and improve the gain of the VGPS. The VGPS supports 6-bit phase and 7-bit gain control. Measurement results demonstrate a maximum insertion loss of -4.5 dB, with RMS phase and gain errors of 1.87° and 0.5 dB, respectively, across the operating frequency range.",

keywords = "CMOS, impedance invariant vector summer, inter-stage matching, loading effect, VGPS",

author = "Eunchae Jo and Mingyu Lee and Haram Park and Hyeonwon Song and Eunsu Mo and Seunghun Wang and Huidong Lee and Bonghyuk Park and Seungchan Lee and Jinseok Park",

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/APMC65046.2025.11379728",

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",

}

Jo, E, Lee, M, Park, H, Song, H, Mo, E, Wang, S, Lee, H, Park, B, Lee, S & Park, J 2025, A Ku-band CMOS Variable-Gain Phase Shifter for Upper Mid-Band 6G Communication. in APMC 2025 - 2025 Asia-Pacific Microwave Conference. Asia-Pacific Microwave Conference Proceedings, APMC, Institute of Electrical and Electronics Engineers Inc., 2025 Asia-Pacific Microwave Conference, APMC 2025, Jeju Island, Korea, Republic of, 2/12/25. https://doi.org/10.1109/APMC65046.2025.11379728

A Ku-band CMOS Variable-Gain Phase Shifter for Upper Mid-Band 6G Communication. / Jo, Eunchae; Lee, Mingyu; Park, Haram et al.
APMC 2025 - 2025 Asia-Pacific Microwave Conference. Institute of Electrical and Electronics Engineers Inc., 2025. (Asia-Pacific Microwave Conference Proceedings, APMC).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

TY - GEN

T1 - A Ku-band CMOS Variable-Gain Phase Shifter for Upper Mid-Band 6G Communication

AU - Jo, Eunchae

AU - Lee, Mingyu

AU - Park, Haram

AU - Song, Hyeonwon

AU - Mo, Eunsu

AU - Wang, Seunghun

AU - Lee, Huidong

AU - Park, Bonghyuk

AU - Lee, Seungchan

AU - Park, Jinseok

PY - 2025

Y1 - 2025

N2 - This paper presents a 13.8-20.7 GHz variable-gain phase shifter (VGPS) for upper mid-Band 6G communication, fabricated in a 65-nm RF CMOS process. The proposed VGPS incorporates a loading effect-resilient I/Q signal generator, an impedance-invariant vector summer, an interstage matching network, a digital-to-analog converter (DAC), and a quadrant selection DPDT switch. The interconnection between the I/Q generator and the vector summer is impedance-matched to minimize reflection and improve the gain of the VGPS. The VGPS supports 6-bit phase and 7-bit gain control. Measurement results demonstrate a maximum insertion loss of -4.5 dB, with RMS phase and gain errors of 1.87° and 0.5 dB, respectively, across the operating frequency range.

AB - This paper presents a 13.8-20.7 GHz variable-gain phase shifter (VGPS) for upper mid-Band 6G communication, fabricated in a 65-nm RF CMOS process. The proposed VGPS incorporates a loading effect-resilient I/Q signal generator, an impedance-invariant vector summer, an interstage matching network, a digital-to-analog converter (DAC), and a quadrant selection DPDT switch. The interconnection between the I/Q generator and the vector summer is impedance-matched to minimize reflection and improve the gain of the VGPS. The VGPS supports 6-bit phase and 7-bit gain control. Measurement results demonstrate a maximum insertion loss of -4.5 dB, with RMS phase and gain errors of 1.87° and 0.5 dB, respectively, across the operating frequency range.

KW - CMOS

KW - impedance invariant vector summer

KW - inter-stage matching

KW - loading effect

KW - VGPS

UR - https://www.scopus.com/pages/publications/105033987623

U2 - 10.1109/APMC65046.2025.11379728

DO - 10.1109/APMC65046.2025.11379728

M3 - Conference contribution

AN - SCOPUS:105033987623

T3 - Asia-Pacific Microwave Conference Proceedings, APMC

BT - APMC 2025 - 2025 Asia-Pacific Microwave Conference

PB - Institute of Electrical and Electronics Engineers Inc.

T2 - 2025 Asia-Pacific Microwave Conference, APMC 2025

Y2 - 2 December 2025 through 5 December 2025

ER -

A Ku-band CMOS Variable-Gain Phase Shifter for Upper Mid-Band 6G Communication

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