公开(公告)号：US20240039564A1

公开(公告)日：2024-02-01

申请号：US18484265

申请日：2023-10-10

Applicant: Apple Inc.

Inventor： Hongrui Wang ,  Abbas Komijani ,  Xinhua Chen

IPC: H04B1/04

CPC classification number: H04B1/04 ,  H04B2001/0408

Abstract: Embodiments presented herein provide apparatus and techniques to reduce a direct current (DC) voltage offset between a transmitter and receiver. Embodiments include a shared reference voltage signal generated by a reference voltage source. The receiver may include a first unit gain buffer to receive a reference voltage signal from the reference voltage source. The transmitter may be communicatively coupled to the receiver via one or more connections and may include a second unit gain buffer communicatively coupled to the first unit gain buffer via one of the connections. An amplifier (e.g., an operation amplifier) of the transmitter may include multiple positive inputs coupled to the second unit gain buffer and an offset tracker. The offset tracker may compensate for a DC offset caused by at least a power supply and/or a ground bounce.

公开(公告)号：US20230291422A1

公开(公告)日：2023-09-14

申请号：US17950053

申请日：2022-09-21

Applicant: Apple Inc.

Inventor： Hongrui Wang ,  Abbas Komijani ,  Xinhua Chen

IPC: G05F1/46 ,  H04B1/04

CPC classification number: G05F1/468 ,  G05F1/461 ,  H04B1/04 ,  H04B2001/0408

Abstract: Embodiments presented herein provide apparatus and techniques to reduce a direct current (DC) voltage offset between a transmitter and receiver. Embodiments include a shared reference voltage signal generated by a reference voltage source. The receiver may include a first unit gain buffer to receive a reference voltage signal from the reference voltage source. The transmitter may be communicatively coupled to the receiver via one or more connections and may include a second unit gain buffer communicatively coupled to the first unit gain buffer via one of the connections. An amplifier (e.g., an operation amplifier) of the transmitter may include multiple positive inputs coupled to the second unit gain buffer and an offset tracker. The offset tracker may compensate for a DC offset caused by at least a power supply and/or a ground bounce.

公开(公告)号：US20230291421A1

公开(公告)日：2023-09-14

申请号：US17690867

申请日：2022-03-09

Applicant: Apple Inc.

Inventor： Hongrui Wang ,  Abbas Komijani ,  Xinhua Chen

IPC: G05F1/46 ,  H04B1/04

CPC classification number: G05F1/468 ,  G05F1/461 ,  H04B1/04 ,  H04B2001/0408

Abstract: Embodiments presented herein provide apparatus and techniques to reduce a direct current (DC) voltage offset between a transmitter and receiver. Embodiments include a shared reference voltage signal generated by a reference voltage source. The receiver may include a first unit gain buffer to receive a reference voltage signal from the reference voltage source. The transmitter may be communicatively coupled to the receiver via one or more connections and may include a second unit gain buffer communicatively coupled to the first unit gain buffer via one of the connections. An amplifier (e.g., an operation amplifier) of the transmitter may include multiple positive inputs coupled to the second unit gain buffer and an offset tracker. The offset tracker may compensate for a DC offset caused by at least a power supply and/or a ground bounce.

公开(公告)号：US12009847B2

公开(公告)日：2024-06-11

申请号：US17950053

申请日：2022-09-21

Applicant: Apple Inc.

Inventor： Hongrui Wang ,  Abbas Komijani ,  Xinhua Chen

IPC: H04B1/04

CPC classification number: H04B1/04 ,  H04B2001/0408

Abstract: Embodiments presented herein provide apparatus and techniques to reduce a direct current (DC) voltage offset between a transmitter and receiver. Embodiments include a shared reference voltage signal generated by a reference voltage source. The receiver may include a first unit gain buffer to receive a reference voltage signal from the reference voltage source. The transmitter may be communicatively coupled to the receiver via one or more connections and may include a second unit gain buffer communicatively coupled to the first unit gain buffer via one of the connections. An amplifier (e.g., an operation amplifier) of the transmitter may include multiple positive inputs coupled to the second unit gain buffer and an offset tracker. The offset tracker may compensate for a DC offset caused by at least a power supply and/or a ground bounce.

公开(公告)号：US11894866B2

公开(公告)日：2024-02-06

申请号：US17690867

申请日：2022-03-09

Applicant: Apple Inc.

Inventor： Hongrui Wang ,  Abbas Komijani ,  Xinhua Chen

IPC: H04B1/04

CPC classification number: H04B1/04 ,  H04B2001/0408

Abstract: Embodiments presented herein provide apparatus and techniques to reduce a direct current (DC) voltage offset between a transmitter and receiver. Embodiments include a shared reference voltage signal generated by a reference voltage source. The receiver may include a first unit gain buffer to receive a reference voltage signal from the reference voltage source. The transmitter may be communicatively coupled to the receiver via one or more connections and may include a second unit gain buffer communicatively coupled to the first unit gain buffer via one of the connections. An amplifier (e.g., an operation amplifier) of the transmitter may include multiple positive inputs coupled to the second unit gain buffer and an offset tracker. The offset tracker may compensate for a DC offset caused by at least a power supply and/or a ground bounce.