公开(公告)号：US20240186955A1

公开(公告)日：2024-06-06

申请号：US18525884

申请日：2023-12-01

Applicant: MEDIATEK INC.

Inventor： Chen-Yen Ho ,  Hsiang-Hui Chang ,  Ya-Ting Hsu ,  Ke-Horng Chen

IPC: H03F1/02

CPC classification number: H03F1/0216 ,  H03F3/21

Abstract: A digital envelope tracking (DET) supply modulator is provided. The DET supply modulator includes a switching converter, a dynamic switched-capacitor circuit and a digital control circuit. The switching converter converts an input supply voltage into an output envelope tracking (ET) voltage according to a first control signal. The dynamic switched-capacitor circuit outputs multiple supplement voltages for supplementing alternating current (AC) components of the output ET voltage by multiple stages. More particularly, the dynamic switched-capacitor circuit comprises multiple switched-capacitor cells and a selection circuit, wherein the selection circuit is coupled to the multiple switched-capacitor cells. In detail, the multiple switched-capacitor cells generate the multiple supplement voltages, respectively, and the selection circuit controls switching of each of the multiple switched-capacitor cells according to a second control signal. The digital control circuit generates the first control signal and the second control signal according to a target envelope waveform of the output ET voltage.