发明授权
- 专利标题： System and method for controlling electromagnetic interference in portable electronic devices having a radio frequency subsystem
- 专利标题（中）： 用于控制具有射频子系统的便携式电子设备中的电磁干扰的系统和方法
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申请号： US13467348申请日： 2012-05-09
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公开(公告)号： US08787990B2公开(公告)日： 2014-07-22
- 发明人: Rene Pierre Marchand , Lyall Kenneth Winger , Christopher David Bernard
- 申请人： Rene Pierre Marchand , Lyall Kenneth Winger , Christopher David Bernard
- 申请人地址： CA Waterloo, Ontario
- 专利权人： BlackBerry Limited
- 当前专利权人： BlackBerry Limited
- 当前专利权人地址： CA Waterloo, Ontario
- 代理机构： Borden Ladner Gervais LLP
- 代理商 Louis B. Allard
- 主分类号： H04M1/00
- IPC分类号： H04M1/00 ; H04B1/38
摘要：
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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