公开(公告)号：US20200244225A1

公开(公告)日：2020-07-30

申请号：US16728193

申请日：2019-12-27

Applicant: MEDIATEK INC.

Inventor： Shih-Mei LIN ,  Chien-Wei KUAN ,  Che-Hao MENG ,  Chen-Yen HO

IPC: H03F1/02 ,  H03F3/21

Abstract: A power supply configured to supply a modulated voltage to a power amplifier is shown. The power supply has an alternating current (AC) component generator, a direct current (DC) component generator, and a transition accelerator. The AC component generator generates an AC component of the modulated voltage according to an envelope tracking signal. The DC component generator generates a DC component of the modulated voltage according to the operational voltage range of the power amplifier. The transition accelerator is coupled to an output terminal of the DC component generator to speed up the transition of the modulated voltage.

公开(公告)号：US20190140597A1

公开(公告)日：2019-05-09

申请号：US16040594

申请日：2018-07-20

Applicant: MEDIATEK Inc.

Inventor： Shih-Mei LIN ,  Che-Hao MENG ,  Da-Wei SUNG ,  Chien-Wei KUAN

IPC: H03F1/02 ,  H02M3/158 ,  H02M3/335 ,  G05F1/565

Abstract: A supply modulator, a modulated power supply circuit, and associated control method are provided. The modulated power supply circuit includes the supply modulator and a DC-DC voltage converter, and the supply modulator includes a linear amplifier and a switching converter. The linear amplifier generates an AC component of a modulated voltage according to a regulated voltage and an envelope tracking signal. The supply voltage is converted to the regulated voltage by the DC-DC voltage converter, and the regulated voltage is greater than or less than the supply voltage. The switching converter includes a step-down circuit and a path selection circuit. The path selection circuit selects one of the supply voltage and the regulated voltage as a DC input voltage. The step-down circuit converts the DC input voltage to a DC component of the modulated voltage which is less than the DC input voltage.