31- https://doi.org/10.1109/tmtt.2011.2131677
A Zero-Voltage-Switching Contour-Based Power Amplifier With Minimal Efficiency Degradation Under Back-Off
- Jun 1, 2011
- IEEE Transactions on Microwave Theory and Techniques
- Nitesh Singhal +3 more
A switching power amplifier (PA) architecture that offers up to 13 dB of output power back-off without any drain efficiency degradation is presented. The proposed zero-voltage-switching (ZVS) contour-based PA employs a series class-E PA in conjunction with duty cycle modulation and a proposed tunable impedance transformation network. So-called ZVS conditions that ensure ideally 100% drain efficiency are satisfied not just at peak output power, but over the 13-dB back-off range. Theoretical analyses of losses in the PA and the impedance transformation network are also presented to prove that drain efficiency actually improves with back-off. Measurement results of a 100-MHz PA built using discrete components on an FR4 printed circuit board showing drain efficiency greater than or equal to the peak efficiency (40%) at all output power levels are also presented.
- # Power Amplifier
- # dB Of Output Power Back-off
- # Drain Efficiency
- # Impedance Transformation Network
- # Switching Power Amplifier
- # Duty Cycle Modulation
- # Zero-voltage-switching
- # Output Power Levels
- # Peak Output Power
- # Output Power
