An AC-Coupling Parallel Hybrid Supply Modulator Achieving 100MHz Envelope Tracking Power Amplifiers for Wireless Communications
Journal
Conference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC
Pages
640-645
Date Issued
2022
Author(s)
Abstract
A wideband hybrid envelope tracking supply modulator (ETSM) utilizing a switching converter (SW) with fast VCAP tracking path and a bandwidth and efficiency enhanced linear amplifier (LA) is presented. In addition to smaller ripple and lower losses of SW with 4.7uH inductance and 5MHz switching frequency, the use of the recommended fast VCAP tracking path produce a higher speed loop and wider converter bandwidth. The SW provides a high percentage of power amplifier (PA) supply load current, reduces the LA low-frequency current and ripple cancellation current, improves the overall system efficiency, while maintaining the best operating point of LA. Through the two proposed compensation methods, the unity gain bandwidth of LA exceeds 670MHz, which meets the strict requirements of 5G New Radio (NR). The supply modulator is fabricated in a 180-nm CMOS process. The post-simulation result shows the tracking of 100MHz sine wave with 79% peak efficiency at 2-W output power and the simulated tone difference reaches 22.6dB. © 2022 IEEE.
Subjects
AC-coupling technique; Envelope tracking; fifth generation communication (5G NR); supply modulator
SDGs
Other Subjects
Bandwidth; Efficiency; Modulators; Power amplifiers; AC-coupling technique; Coupling techniques; Envelope tracking; Envelope tracking power amplifiers; Fifth generation communication (5g new radio); Linear amplifiers; Parallel hybrids; Supply modulator; Wide-band; Wireless communications; 5G mobile communication systems
Type
conference paper