Electronic device with dynamic drive strength adjustment to mitigate impact of system noise on wireless performance

Patent metadata

Field	Value
Publication number	US-8971833-B2
Application number	US-89256210-A
Country	US
Kind code	B2
Filing date	Sep 28, 2010
Priority date	Sep 28, 2010
Publication date	Mar 3, 2015
Grant date	Mar 3, 2015

Abstract

Electronic devices such as portable computers may contain circuits that generate radio-frequency noise. The radio-frequency noise may interfere with the operation of sensitive circuitry such as wireless communications circuitry. The circuits that generate the radio-frequency noise may include differential signal drivers that drive signals onto communications lines such as lines in a bus or output interface. A control circuit may power the drivers at an adjustable driver voltage bias level. The amount of noise that is generated by the drivers may vary as a function of the voltage bias level and may produce different amounts of noise at different wireless frequencies. Computer lid position and other factors may also influence the amount of interference that is generated. The control circuit may determine the current operating state of the device and may make voltage bias level adjustments that minimize interference between the drivers and the wireless circuitry.

First claim

What is claimed is:

1. An electronic device that has a current operating state that comprises a relative position between housing structures in the electronic device, comprising:
drivers that drive signals onto communications lines;
control circuitry that powers the drivers at a driver bias voltage level;
wireless circuitry that is subject to potential interference from radio-frequency noise produced by the drivers; and
control circuitry that adjusts the driver bias voltage…

Assignees

• Lashkari Hassan
• Thomason Gary
• Tolentino Jaime
• Apple Inc

Inventors

• Lashkari Hassan
• Thomason Gary
• Tolentino Jaime

Classifications

• H04L25/0264 Primary

  Electricity · mapped topic