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Keywords = wideband hybrid envelope tracking supply modulator

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12 pages, 5365 KiB  
Article
A 100 MHz 3 dB Bandwidth, 30 V Rail-to-Rail Class-AB Buffer Amplifier for Base Station ET-PA Hybrid Supply Modulator
by Min-Ju Kim, Donghwi Kang, Gyujin Choi, Seong-Jun Youn and Ji-Seon Paek
Electronics 2025, 14(15), 3036; https://doi.org/10.3390/electronics14153036 - 30 Jul 2025
Viewed by 200
Abstract
This paper presents the first hybrid supply modulator (HSM) designed for envelope tracking power amplifiers (ET-PAs) in base station applications. The focus is on a rail-to-rail Class-AB linear amplifier (LA) optimized for high-voltage and wide-bandwidth operation. The LA is designed using 130 nm [...] Read more.
This paper presents the first hybrid supply modulator (HSM) designed for envelope tracking power amplifiers (ET-PAs) in base station applications. The focus is on a rail-to-rail Class-AB linear amplifier (LA) optimized for high-voltage and wide-bandwidth operation. The LA is designed using 130 nm BCD technology, utilizing Laterally Diffused Metal-Oxide Semiconductor (LDMOS) transistors for high-voltage operation and incorporating shielding MOSFETs to protect the low-voltage devices. The circuit utilizes dual power supply domains (5 V and 30 V) to improve power efficiency. The proposed LA achieves a bandwidth of 100 MHz and a slew rate of +1003/−852 V/μs, with a quiescent power consumption of 0.89 W. Transient simulations using a 50 MHz bandwidth 5G NR envelope input demonstrate that the proposed HSM achieves a power efficiency of 83%. Consequently, the proposed HSM supports high-output (100 W) wideband 5G NR transmission with enhanced efficiency. Full article
(This article belongs to the Special Issue Analog/Mixed Signal Integrated Circuit Design)
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16 pages, 5599 KiB  
Article
A Wideband Hybrid Envelope Tracking Supply Modulator with Slew-Rate-Enhanced Linear Amplifier
by Kaida Zhang, Jianhui Wu, Huabao Zhuang, Zhening Shi, Xiaofeng Lyu, Zhiyu Wang, Hua Chen and Faxin Yu
Electronics 2024, 13(14), 2701; https://doi.org/10.3390/electronics13142701 - 10 Jul 2024
Cited by 1 | Viewed by 1405
Abstract
A wideband hybrid envelope tracking supply modulator (HETSM) with a slew-rate-enhanced linear amplifier (LA) is described in this work. The proposed slew-rate enhancement (SRE) structure introduces a parallel auxiliary current path directly to the gate of the class-AB output stage, significantly accelerating the [...] Read more.
A wideband hybrid envelope tracking supply modulator (HETSM) with a slew-rate-enhanced linear amplifier (LA) is described in this work. The proposed slew-rate enhancement (SRE) structure introduces a parallel auxiliary current path directly to the gate of the class-AB output stage, significantly accelerating the charging and discharging processes of the Miller capacitor without modifying the operating point of the remaining LA. The current delivered via this supplementary path shows a rapid increase, with changes in input voltage, culminating in diminished quiescent current levels. The supply modulator is fabricated in a 180 nm CMOS process. The measurement results show that HETSM is able to track a 100 MHz, 16QAM signal accurately, achieving the maximum efficiency of 87.4% at a 5.12 W output power, with a load that consists of a 5 Ω resistor and a paralleled 100 pF capacitor. The proposed LA realizes a slew rate of −1857/+1239 V/μs and a bandwidth of 226.6 MHz under a 24 mA quiescent current. Full article
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