公开(公告)号：US20240213934A1

公开(公告)日：2024-06-27

申请号：US18308104

申请日：2023-04-27

Applicant: SAMSUNG ELECTRO-MECHANICS CO., LTD.

Inventor： Youngwong JANG ,  Jeonghoon KIM ,  Shinichi IIZUKA ,  Hyejin LEE ,  Jongok HA

IPC: H03F3/21 ,  H03F1/02 ,  H03F1/52

CPC classification number: H03F3/21 ,  H03F1/0216 ,  H03F1/52

Abstract: A power amplifier includes: a power transistor to receive a power voltage; a first transistor including a first terminal to provide a bias current to the power transistor; and an overpower protection circuit to generate a first current corresponding to the power voltage and to provide the first current to a second terminal of the first transistor. The overpower protection circuit includes: a limiting current source to provide a limiting current to the second terminal of the first transistor; and a sink current generating circuit including a second transistor that includes a control terminal to which a voltage corresponding to the power voltage is applied and a first terminal connected to the second terminal of the first transistor, and to sink a second current from the limiting current.

公开(公告)号：US20230111377A1

公开(公告)日：2023-04-13

申请号：US17862511

申请日：2022-07-12

Applicant: SAMSUNG ELECTRO-MECHANICS CO., LTD.

Inventor： Youngwong JANG ,  Jeonghoon KIM ,  Jongok HA ,  Shinichi IIZUKA ,  Hyejin LEE

IPC: H03F1/02 ,  H03F3/24

Abstract: A power supply switch circuit includes: a first switch to switch supply of a first power supply voltage to a power supply terminal of a power amplifier; a control voltage generator to generate a first control voltage through a charge pump operation, and to control the charge pump operation by comparing the first power supply voltage to a first voltage, which is a voltage of the power supply terminal; and a switch controller to generate a switching driving signal to control the first switch using the first control voltage.