A 108-to-141.8GHz 27.1%-Tuning-Range Synthesizer Employing a Dual-Reference-FTL Sub-Sampling PLL and 3rd-Harmonic-Enhancement Class-F VCO and Injection-Locked Frequency Tripler

Trong Khoi PHAN; Howard Cam LUONG

doi:10.1109/RFIC61188.2025.11082941

A 108-to-141.8GHz 27.1%-Tuning-Range Synthesizer Employing a Dual-Reference-FTL Sub-Sampling PLL and 3^rd-Harmonic-Enhancement Class-F VCO and Injection-Locked Frequency Tripler

Trong Khoi PHAN, Howard Cam LUONG

Department of Electronic and Computer Engineering

Research output: Chapter in Book/Conference Proceeding/Report › Conference Paper published in a book › peer-review

Abstract

A sub-THz frequency synthesizer employs a cascade of a sub-sampling PLL featuring a frequency-tracking loop with dual co-prime sub-sampling factors for an infinite lock-in range, a 3^rd-harmonic-amplitude-enhancement class-F VCO, a harmonic-rejection-enhancement class-F ILFT, and a feed-forward locking-range enhancement. The proposed synthesizer measures 27.1% frequency tuning range from 108 GHz to 141.8 GHz with maximum output power of -22dBm, -3dB bandwidth of 25GHz while consuming 38mW.

Original language	English
Title of host publication	2025 IEEE Radio Frequency Integrated Circuits Symposium, RFIC 2025
Editors	Jane Gu, Kenichi Okada
Publisher	Institute of Electrical and Electronics Engineers Inc.
Pages	363-366
Number of pages	4
ISBN (Electronic)	9798331514112
DOIs	https://doi.org/10.1109/RFIC61188.2025.11082941
Publication status	Published - 24 Jul 2025
Event	2025 IEEE Radio Frequency Integrated Circuits Symposium, RFIC 2025 - San Francisco, United States Duration: 15 Jun 2025 → 17 Jun 2025

Publication series

Name	Digest of Papers - IEEE Radio Frequency Integrated Circuits Symposium
ISSN (Print)	1529-2517

Conference

Conference	2025 IEEE Radio Frequency Integrated Circuits Symposium, RFIC 2025
Country/Territory	United States
City	San Francisco
Period	15/06/25 → 17/06/25

Bibliographical note

Publisher Copyright:
© 2025 IEEE.

Keywords

D-band
PLL
frequency tracking loop
injection-locked
oscillator
sub-THz
sub-sampling

Access to Document

10.1109/RFIC61188.2025.11082941

Cite this

PHAN, T. K., & LUONG, H. C. (2025). A 108-to-141.8GHz 27.1%-Tuning-Range Synthesizer Employing a Dual-Reference-FTL Sub-Sampling PLL and 3^rd-Harmonic-Enhancement Class-F VCO and Injection-Locked Frequency Tripler. In J. Gu, & K. Okada (Eds.), 2025 IEEE Radio Frequency Integrated Circuits Symposium, RFIC 2025 (pp. 363-366). (Digest of Papers - IEEE Radio Frequency Integrated Circuits Symposium). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/RFIC61188.2025.11082941

PHAN, Trong Khoi ; LUONG, Howard Cam. / A 108-to-141.8GHz 27.1%-Tuning-Range Synthesizer Employing a Dual-Reference-FTL Sub-Sampling PLL and 3^rd-Harmonic-Enhancement Class-F VCO and Injection-Locked Frequency Tripler. 2025 IEEE Radio Frequency Integrated Circuits Symposium, RFIC 2025. editor / Jane Gu ; Kenichi Okada. Institute of Electrical and Electronics Engineers Inc., 2025. pp. 363-366 (Digest of Papers - IEEE Radio Frequency Integrated Circuits Symposium).

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title = "A 108-to-141.8GHz 27.1\%-Tuning-Range Synthesizer Employing a Dual-Reference-FTL Sub-Sampling PLL and 3rd-Harmonic-Enhancement Class-F VCO and Injection-Locked Frequency Tripler",

abstract = "A sub-THz frequency synthesizer employs a cascade of a sub-sampling PLL featuring a frequency-tracking loop with dual co-prime sub-sampling factors for an infinite lock-in range, a 3rd-harmonic-amplitude-enhancement class-F VCO, a harmonic-rejection-enhancement class-F ILFT, and a feed-forward locking-range enhancement. The proposed synthesizer measures 27.1\% frequency tuning range from 108 GHz to 141.8 GHz with maximum output power of -22dBm, -3dB bandwidth of 25GHz while consuming 38mW.",

keywords = "D-band, PLL, frequency tracking loop, injection-locked, oscillator, sub-THz, sub-sampling",

author = "PHAN, \{Trong Khoi\} and LUONG, \{Howard Cam\}",

note = "Publisher Copyright: {\textcopyright} 2025 IEEE.; 2025 IEEE Radio Frequency Integrated Circuits Symposium, RFIC 2025 ; Conference date: 15-06-2025 Through 17-06-2025",

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PHAN, TK & LUONG, HC 2025, A 108-to-141.8GHz 27.1%-Tuning-Range Synthesizer Employing a Dual-Reference-FTL Sub-Sampling PLL and 3^rd-Harmonic-Enhancement Class-F VCO and Injection-Locked Frequency Tripler. in J Gu & K Okada (eds), 2025 IEEE Radio Frequency Integrated Circuits Symposium, RFIC 2025. Digest of Papers - IEEE Radio Frequency Integrated Circuits Symposium, Institute of Electrical and Electronics Engineers Inc., pp. 363-366, 2025 IEEE Radio Frequency Integrated Circuits Symposium, RFIC 2025, San Francisco, United States, 15/06/25. https://doi.org/10.1109/RFIC61188.2025.11082941

A 108-to-141.8GHz 27.1%-Tuning-Range Synthesizer Employing a Dual-Reference-FTL Sub-Sampling PLL and 3^rd-Harmonic-Enhancement Class-F VCO and Injection-Locked Frequency Tripler. / PHAN, Trong Khoi; LUONG, Howard Cam.
2025 IEEE Radio Frequency Integrated Circuits Symposium, RFIC 2025. ed. / Jane Gu; Kenichi Okada. Institute of Electrical and Electronics Engineers Inc., 2025. p. 363-366 (Digest of Papers - IEEE Radio Frequency Integrated Circuits Symposium).

Research output: Chapter in Book/Conference Proceeding/Report › Conference Paper published in a book › peer-review

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PHAN TK, LUONG HC. A 108-to-141.8GHz 27.1%-Tuning-Range Synthesizer Employing a Dual-Reference-FTL Sub-Sampling PLL and 3^rd-Harmonic-Enhancement Class-F VCO and Injection-Locked Frequency Tripler. In Gu J, Okada K, editors, 2025 IEEE Radio Frequency Integrated Circuits Symposium, RFIC 2025. Institute of Electrical and Electronics Engineers Inc. 2025. p. 363-366. (Digest of Papers - IEEE Radio Frequency Integrated Circuits Symposium). doi: 10.1109/RFIC61188.2025.11082941