The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 19, 2018
Filed:
Mar. 06, 2015
Apple Inc., Cupertino, CA (US);
Songping Wu, Austin, TX (US);
Zhiping Yang, Cupertino, CA (US);
Kirill Kalinichev, San Francisco, CA (US);
Greg Nayman, Mountain View, CA (US);
Georgi Beloev, Walnut Creek, CA (US);
APPLE INC., Cupertino, CA (US);
Abstract
Methods and apparatus for equalization of a high speed serial bus. A well-tuned passive equalization circuit for use with high frequency differential signals 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.