公开(公告)号：US20240022223A1

公开(公告)日：2024-01-18

申请号：US18476190

申请日：2023-09-27

Applicant: Apple Inc.

Inventor： Kefei Wu ,  Morteza Nick ,  David M. Signoff ,  Preeti S. Mulage

IPC: H03G3/30 ,  H03F3/72 ,  H04B1/00

CPC classification number: H03G3/3026 ,  H03F3/72 ,  H04B1/0053 ,  H03G2201/103 ,  H03F2200/24

Abstract: This disclosure is directed to reducing output voltage distortions of Variable Gain Amplifiers (VGAs). A VGA may include a number of amplifiers each providing a portion of a total gain of the VGA. For example, a processing circuit may select one or more of the amplifiers of the VGA to provide the output signal with a selected gain. However, the selected amplifiers may provide amplified signals with one or more distortion signals when receiving a bias voltage. Systems and methods are described to reduce or cancel the distortion signals of the selected amplifiers by providing a subthreshold nonzero bias voltage (e.g., a weak voltage) to the remaining (e.g., non-selected) amplifiers of the VGA. For example, the non-selected amplifiers may receive the weak voltage to provide distortion signals with similar voltage amplitude and out of phase compared to the distortion signals of the selected amplifiers.

公开(公告)号：US20240267035A1

公开(公告)日：2024-08-08

申请号：US18164307

申请日：2023-02-03

Applicant: Apple Inc.

Inventor： Venu Chandaka ,  Preeti S. Mulage

IPC: H03K3/012 ,  H03K19/20

CPC classification number: H03K3/012 ,  H03K19/20

Abstract: As the complexity of integrated circuits (ICs) increase (e.g., more sophisticated circuit designs and/or more circuit components integrated into the ICs), digital routing channels connecting various circuit components may occupy more chip area to prevent certain interferences (e.g., interference caused by a channel crosstalk or coupling between adjacent digital routing channels), resulting in certain problems, such as reduced efficiency of chip area usage and increased power consumption. To solve such problems, inverter staggering circuits and/or coaxial shielding of digital routing channels may be used in the ICs to mitigate the interferences. The inverter staggering circuits and/or coaxial shielding may improve the robustness of digital signals transmitted via the digital routing channels with reduced interferences, resulting in enhanced signal integrity, chip area utilization, power saving, and the like.