US Patent 7990212 Modulated audio amplifier output enable control

Patent 7990212 was granted and assigned to Cirrus Logic on August, 2011 by the United States Patent and Trademark Office.

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Is a

Patent

Patent attributes

Current Assignee

Cirrus Logic

Patent Jurisdiction

United States Patent and Trademark Office

Patent Number

79902120

Patent Inventor Names

Robin Matthew Tsang0

Date of Patent

August 2, 2011

Patent Application Number

126415240

Date Filed

December 18, 2009

Patent Primary Examiner

‌

Henry K Choe

Patent abstract

A modulated amplifier output enable control eliminates audible pops when enabling and disabling an audio amplifier output stage. The output of the audio amplifier is transitioned between an enabled state and a disabled state using a modulated control signal that enables and disables the output of the audio amplifier. Durations of the enabled state vs. the disabled state of the amplifier are adjusted to cause a transition between a fully disabled state and a fully enabled state of the audio amplifier so that the transition between the disabled state and the enabled state of the amplifier output is inaudible.