公开(公告)号：US20160267044A1

公开(公告)日：2016-09-15

申请号：US14641170

申请日：2015-03-06

Applicant: Apple Inc.

Inventor： Songping WU ,  Zhiping YANG ,  Kirill KALINICHEV ,  Greg NAYMAN ,  Georgi Beloev

IPC: G06F13/42 ,  G06F1/32 ,  G06F13/40

CPC classification number: G06F13/4282 ,  G06F1/3287 ,  G06F13/4022

Abstract: Methods and apparatus for equalization of a high speed serial bus. Various aspects of the present disclosure are directed to a well-tuned passive equalization circuit for use with high frequency differential signals that suffer from e.g., impedance mismatches, impedance discontinuities (e.g., connectors, etc.). In one embodiment, a shunting circuit is inserted between the differential terminals of a Universal Serial Bus (USB) cable, connector, etc. The shunting circuit is configured to “open” at low frequencies to enable Full Speed (FS) enumeration, while also providing sufficiently high impedance at high frequencies to enable High Speed (HS) operation. In one such implementation, the shunting circuit includes a tuned resistor, capacitor, inductor, and switch element arranged in series.

Abstract translation: 高速串行总线均衡的方法和装置。 本公开的各个方面涉及一种用于与例如阻抗失配，阻抗不连续性（例如，连接器等）相遇的高频差分信号的被调谐的无源均衡电路。 在一个实施例中，分流电路插入在通用串行总线（USB）电缆，连接器等的差分端子之间。分流电路被配置为在低频下“打开”以实现全速（FS）枚举，同时 在高频下提供足够高的阻抗以实现高速（HS）操作。 在一种这样的实施方案中，分流电路包括串联布置的调谐电阻器，电容器，电感器和开关元件。