Blackberry Corporation

Christopher David Bernard

Lyall Kenneth Winger

Rene Pierre Marchand

Ryan Alexander Geris

Kai Xu

Marc Edward Holbein

A portable electronic device for reducing specific absorption rate (SAR) is provided. The portable electronic device comprises a processor, at least one antenna, and a sensor enabled to detect when the portable electronic device is being held by a complementary holder, the processor enabled to: determine that the sensor has detected the holder; and, responsively, switch the at least one antenna from an omnidirectional mode to a directional mode such that energy is radiated from a given side of the portable electronic device.

Portable electronic device for reducing specific absorption rate

A power converter system for managing power between a power supply and a load, the system including: a first buck-boost circuit connected to the power supply; and a capacitor provided between the buck-boost circuit and the load to buffer power supply for the load. The system may include a second buck-boost circuit between the capacitor and the load. In another embodiment, a power converter system includes: a boost circuit connected to the power supply; a buck circuit connected to the load; and a capacitor provided between the boost circuit and the buck circuit to manage the supply of power to the load.

Power converter system for mobile devices

A portable electronic device that has a radio frequency communication subsystem operationally connected switch-mode power supply subsystem. The switch-mode power supply subsystem generates a pulse-width modulation electrical signal that produces electromagnetic interference. The switch-mode power supply subsystem can reduce the slew rate of the pulse-width modulation electrical signal when the radio-frequency communication subsystem is active. This reduces the level of the electromagnetic interference signal only during radio frequency communication, which improves the efficiency of the radio frequency communication. Not having the reduced slew rate when there is no radio frequency communication allows for higher modulation efficiency.

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Kitchener, Canada

Christopher David Bernard