{AI Talks with Tea&Coffee #48} Distinguished Microwave Lecturers Series: High-Frequency Doherty Power Amplifiers: Challenges and Design Methodologies
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Abstract:
Doherty power amplifiers are widely used to achieve high efficiency with high-PAPR signals, but their extension to millimetre-wave frequencies is far from trivial. At high frequency, classical Doherty assumptions no longer hold, and efficiency, gain, bandwidth, linearity, and implementation constraints become strongly interdependent.
This lecture provides a design-oriented perspective on the key challenges limiting high-frequency Doherty operation and discusses practical methodologies to address them. Topics include gain behaviour, on-chip power combination, bandwidth limitations, and linearity degradation, with emphasis on architectural trade-offs rather than idealized solutions. The discussion is supported by measured GaN MMIC examples for 5G and satellite applications, showing that successful high-frequency Doherty designs rely on balanced co-design choices rather than isolated performance optimization.
Short Bio:
Vittorio Camarchia is an Associate Professor at the Department of Electronics and Telecommunications, Politecnico di Torino, Italy. His research focuses on high-efficiency and high-linearity RF/microwave power amplifiers for 5G/6G and satellite communications, with emphasis on load-modulated architectures, including Doherty, Chireix and LMBA amplifiers, GaN/GaAs MMIC design, and broadband linearization. He is Track Editor for MWTL, Chair of IEEE MTT-S TC-23 Wireless Communications for 2025–2026 and an IEEE MTT-S Distinguished Microwave Lecturer for 2026–2028.
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- 2 Court Street
- NASHUA, New Hampshire
- United States 03060
- Building: Nashua Public Library
- Room Number: Grand/Large Conference Room
- Starts 30 June 2026 04:00 AM UTC
- Ends 13 July 2026 08:00 PM UTC
- No Admission Charge
Speakers
Prof. Dr. Vittorio Camarchia
High-Frequency Doherty Power Amplifiers: Challenges and Design Methodologies
Title:
High-Frequency Doherty Power Amplifiers: Challenges and Design Methodologies
Abstract:
Doherty power amplifiers are widely used to achieve high efficiency with high-PAPR signals, but their extension to millimetre-wave frequencies is far from trivial. At high frequency, classical Doherty assumptions no longer hold, and efficiency, gain, bandwidth, linearity, and implementation constraints become strongly interdependent.
This lecture provides a design-oriented perspective on the key challenges limiting high-frequency Doherty operation and discusses practical methodologies to address them. Topics include gain behaviour, on-chip power combination, bandwidth limitations, and linearity degradation, with emphasis on architectural trade-offs rather than idealized solutions. The discussion is supported by measured GaN MMIC examples for 5G and satellite applications, showing that successful high-frequency Doherty designs rely on balanced co-design choices rather than isolated performance optimization.
Short Bio:
Vittorio Camarchia is an Associate Professor at the Department of Electronics and Telecommunications, Politecnico di Torino, Italy. His research focuses on high-efficiency and high-linearity RF/microwave power amplifiers for 5G/6G and satellite communications, with emphasis on load-modulated architectures, including Doherty, Chireix and LMBA amplifiers, GaN/GaAs MMIC design, and broadband linearization. He is Track Editor for MWTL, Chair of IEEE MTT-S TC-23 Wireless Communications for 2025–2026 and an IEEE MTT-S Distinguished Microwave Lecturer for 2026–2028.
Biography:
Vittorio Camarchia is an Associate Professor at the Department of Electronics and Telecommunications, Politecnico di Torino, Italy. His research focuses on high-efficiency and high-linearity RF/microwave power amplifiers for 5G/6G and satellite communications, with emphasis on load-modulated architectures, including Doherty, Chireix and LMBA amplifiers, GaN/GaAs MMIC design, and broadband linearization. He is Track Editor for MWTL, Chair of IEEE MTT-S TC-23 Wireless Communications for 2025–2026 and an IEEE MTT-S Distinguished Microwave Lecturer for 2026–2028.
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