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:
Mar. 01, 2011
Filed:
Mar. 20, 2009
Raminder Jit Singh, San Jose, CA (US);
Ansuya P. Bhatt, Cupertino, CA (US);
Raminder Jit Singh, San Jose, CA (US);
Ansuya P. Bhatt, Cupertino, CA (US);
National Semiconductor Corporation, Santa Clara, CA (US);
Abstract
An apparatus includes first and second amplifiers, each having an input coupled to an audio signal input and an output coupled to an audio signal output. The second amplifier also has a feedback path from its output to its input. A first switch can be operated to selectively couple and uncouple the audio signal input and the input to the first amplifier to and from a first node. A second switch can be operated to selectively couple and uncouple the input of the second amplifier to and from a second node. A third switch can be operated to selectively couple and uncouple the first node to and from ground.