公开(公告)号：US20230231551A1

公开(公告)日：2023-07-20

申请号：US17987875

申请日：2022-11-16

Applicant: MEDIATEK INC.

Inventor： Fong-Wen Lee ,  Wen-Chieh Wang ,  Yu-Hsin Lin

IPC: H03K17/16 ,  H03H11/28

CPC classification number: H03K17/161 ,  H03H11/28

Abstract: The present invention provides a transmitter including a first variable resistor, a first transistor, a second transistor, a third transistor and a fourth transistor is disclosed. The first variable resistor is coupled between a supply voltage and a first node. A first electrode of the first transistor is coupled to the first node, and a second electrode of the first transistor is coupled to a first output terminal of the transmitter. A first electrode of the second transistor is coupled to the first output terminal of the transmitter, and a second electrode of the second transistor is coupled to a second node. A first electrode of the third/fourth transistor is coupled to the first node, and a second electrode of the third/fourth transistor is coupled to a second output terminal of the transmitter.

公开(公告)号：US11552602B2

公开(公告)日：2023-01-10

申请号：US17227583

申请日：2021-04-12

Applicant: MEDIATEK INC.

Inventor： Fong-Wen Lee ,  Wen-Chieh Wang ,  Yu-Hsin Lin

IPC: H03F3/217 ,  H03K19/21

Abstract: A class-D amplifier with good signal-to-noise ratio (SNR) performance is shown. The class-D amplifier includes a loop filter, a pulse-width modulation signal generator, a gate driver, a power driver, and a feedback circuit, which are configured to establish a closed amplification loop. The feedback circuit is configured to establish a feedback path. The class-D amplifier further includes a feedback breaker. The feedback breaker breaks the feedback path in response to conditions in which there no-signal information in the class-D amplifier.