Mariappan, Selvakumar and Rajendran, Jagadheswaran and Idros, Norhamizah and Sal Hamid, Sofiyah and Bin Abd Manaf, Asrulnizam and Kumar, Narendra and Alghaihab, Abdullah and Nathan, Arokia and Siddik Yarman, Binboga (2025) A 28-GHz CMOS-65 nm Dual Mode Class-J Doherty Power Amplifier With Integrated Class-G Driver and Impedance-Modulated- Quadrature-Transformer Achieving 21% Back-Off Efficiency. IEEE Access, 13. pp. 17236-17245. ISSN 2169-3536, DOI https://doi.org/10.1109/ACCESS.2025.3530958.
Full text not available from this repository.Abstract
In this paper, a CMOS Class-J Doherty power amplifier (PA) integrating a Class-G driver and an Impedance-Modulated-Quadrature-Transformer (IMQT) to enhance back-off efficiency for multimode operations is presented. The Class-J Doherty PA utilizes a second harmonic termination to improve its efficiency. To further augment efficiency at deep back-off output power, a single-supply-rail Class-G driver operates with the IMQT, modulating the interstage impedance between the driver and the Doherty stages. The IMQT features a stacked transformer architecture and dynamically adjusts its impedance by switching a floating, intermediate coil between the transformer's primary and secondary windings. A comparator regulates the IMQT based on the Class-G driver's operation. The IMQT-DPA, fabricated using a 65nm CMOS process, operates at a center frequency of 28 GHz with a supply headroom of 1.8V. The PA achieves an average output power of 14 dBm with a back-off efficiency of 21%, representing a 1.4-fold efficiency enhancement compared to conventional Class-B operation. Under low-power mode (V-DD/2) with a Class-G driver operation, the average output power is 11.3 dBm with a 1.3-fold efficiency improvement.
| Item Type: | Article |
|---|---|
| Funders: | Ministry of Higher Education Malaysia for Fundamental Research Grant Scheme (FRGS/1/2024/TK07/USM/02/7), King Saud University (RSPD2024R806) |
| Uncontrolled Keywords: | Coils; Transformers; Power amplifiers; Impedance; Modulation; Impedance matching; Switches; Power generation; Inductance; Capacitors; CMOS; Doherty; power amplifier (PA); quadrature-transformer; back-off efficiency; millimeter-wave; Ka-band; 5G; class-J; class-G |
| Subjects: | T Technology > TK Electrical engineering. Electronics Nuclear engineering |
| Divisions: | Faculty of Engineering > Department of Electrical Engineering |
| Depositing User: | Ms. Juhaida Abd Rahim |
| Date Deposited: | 23 Apr 2025 01:19 |
| Last Modified: | 23 Apr 2025 01:19 |
| URI: | http://eprints.um.edu.my/id/eprint/48037 |
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