Invention Grant
US08194853B2 Surge immunity circuit for telecom DDA 失效
电讯DDA浪涌电路

  • Patent Title: Surge immunity circuit for telecom DDA
  • Patent Title (中): 电讯DDA浪涌电路
  • Application No.: US12490515
    Application Date: 2009-06-24
  • Publication No.: US08194853B2
    Publication Date: 2012-06-05
  • Inventor: Donald Laturell
  • Applicant: Donald Laturell
  • Applicant Address: US CA Milpitas
  • Assignee: LSI Corporation
  • Current Assignee: LSI Corporation
  • Current Assignee Address: US CA Milpitas
  • Main IPC: H04M1/00
  • IPC: H04M1/00
Surge immunity circuit for telecom DDA
Abstract:
In described embodiments, a data communication device employing, for example, a modem and a data access arrangement (DAA) electrically connected to a telephone network has an increased surge immunity through use of improved hook switch driver and line modulation driver circuitry. In accordance with described embodiments, hook switch driver circuitry exhibits decreased surge power dissipation by maintaining the hook switch driver transistors in saturation at higher currents while reducing the collector-emitter voltage across hook switch driver transistors, and line modulation driver circuitry exhibits decreased total surge power dissipation by i) limiting surge voltage ii) over voltage stress of the line driver transistor.
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