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:
Aug. 03, 2010
Filed:
Jul. 14, 2009
Douglas M. Farrar, Los Altos, CA (US);
Wendell B. Sander, Los Gatos, CA (US);
Douglas M. Farrar, Los Altos, CA (US);
Wendell B. Sander, Los Gatos, CA (US);
Apple Inc., Cupertino, CA (US);
Abstract
Hybrid circuits for electronic devices and accessories for electronic devices are provided. One or more pairs of hybrid circuits may convey audio signals, noise cancellation audio signals, microphone signals, control signals, and other signals between an electronic device and an accessory. The hybrid circuits may include a voltage controlled current source, a differential amplifier, separate signal and ground pins, multiple ground lines, an amplifier on a ground noise sense input line that can sense ground noise that may result from parasitic resistance, and other circuitry.