公开(公告)号：US20230402986A1

公开(公告)日：2023-12-14

申请号：US17840093

申请日：2022-06-14

Applicant: Apple Inc.

Inventor： Xi Yao ,  Hao Xu ,  Pengbei Zhang ,  Aly Mohamed Mamdouh Ismail

IPC: H03H7/01 ,  H03H7/075 ,  H04B1/18 ,  H03H11/12

CPC classification number: H03H7/0115 ,  H03H7/075 ,  H03H7/1741 ,  H04B1/18 ,  H03H11/12

Abstract: This disclosure is directed to filtering in a transceiver of an electronic device. In some instances, active analog filters may be deployed in the transceiver of the electronic device to achieve greater linearity and/or reduce noise in the transceiver. However, as signal bandwidth grows increasingly larger, an active analog filter may consume excessive power. To remedy the excessive power consumption, a passive ladder LC filter may be used. Some LC ladder filters may include a limited quality factor (Q), which may lead to undesirable effects in the transceiver (e.g., voltage droop). To address these undesirable effects, certain components in the LC ladder filter may be relocated from an input port to a feedback chain of an amplifier coupled to the LC ladder filter. The new structure may enable components in the LC ladder filter to be tuned without causing additional voltage droop across the LC ladder filter.

公开(公告)号：US11894825B2

公开(公告)日：2024-02-06

申请号：US17840093

申请日：2022-06-14

Applicant: Apple Inc.

Inventor： Xi Yao ,  Hao Xu ,  Pengbei Zhang ,  Aly Mohamed Mamdouh Ismail

IPC: H03H7/01 ,  H03H7/06 ,  H03H7/075 ,  H03H11/12 ,  H04B1/18

CPC classification number: H03H7/1741 ,  H03H7/0115 ,  H03H7/06 ,  H03H7/075 ,  H03H11/12 ,  H04B1/18

Abstract: This disclosure is directed to filtering in a transceiver of an electronic device. In some instances, active analog filters may be deployed in the transceiver of the electronic device to achieve greater linearity and/or reduce noise in the transceiver. However, as signal bandwidth grows increasingly larger, an active analog filter may consume excessive power. To remedy the excessive power consumption, a passive ladder LC filter may be used. Some LC ladder filters may include a limited quality factor (Q), which may lead to undesirable effects in the transceiver (e.g., voltage droop). To address these undesirable effects, certain components in the LC ladder filter may be relocated from an input port to a feedback chain of an amplifier coupled to the LC ladder filter. The new structure may enable components in the LC ladder filter to be tuned without causing additional voltage droop across the LC ladder filter.