## 摘要

This article proposes an envelope tracking supply modulator (ETSM) that recycles the originally wasted energy in the linear amplifier (LA) to generate negative voltage <formula> <tex>${V_{{NEG}}}$</tex> </formula> and achieve fast down tracking. With the insertion of <formula> <tex>${V_{{NEG}}}$</tex> </formula> , the negative slope of <formula> <tex>${I_{{BUCK}}}$</tex> </formula> becomes 25% larger. <formula> <tex>${V_{{NEG}}}$</tex> </formula> is also used to boost the input voltage of buck converter from 2 <formula> <tex>${V_{{BAT}}}$</tex> </formula> to 2.6 <formula> <tex>${V_{{BAT}}}$</tex> </formula> and raise the positive slope of <formula> <tex>${I_{{BUCK}}}$</tex> </formula> by 93%, which improves the transient response of buck converter and decreases <formula> <tex>${| I_{{LA}}|}$</tex> </formula> by 37%. With energy recycling and high-bandwidth LA replica, ETSM supports 150-MHz 5G new radio (5G NR) application and achieves 89.7% efficiency when output power is 3.7 W. In addition, the proposed differential feedforward technique controls the operation of energy recycling precisely with the calibration logic.

原文 | English |
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頁（從 - 到） | 1 |

頁數 | 1 |

期刊 | IEEE Journal of Solid-State Circuits |

DOIs | |

出版狀態 | Accepted/In press - 2022 |