A Wideband Hybrid Envelope Tracking Supply Modulator with Slew-Rate-Enhanced Linear Amplifier

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 acc...

Full description

Saved in:
Bibliographic Details
Published in:Electronics (Basel) 2024-07, Vol.13 (14), p.2701
Main Authors: Zhang, Kaida, Wu, Jianhui, Zhuang, Huabao, Shi, Zhening, Lyu, Xiaofeng, Wang, Zhiyu, Chen, Hua, Yu, Faxin
Format: Article
Language:English
Subjects:
Bandwidths
Broadband
Capacitors
Efficiency
Linear amplifiers
Modulators
Slew rate
Tracking
Transistors
Citations: Items that this one cites
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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.
ISSN:2079-9292
2079-9292
DOI:10.3390/electronics13142701