Invention Grant
US07697905B2 Local oscillator feedthrough cancellation scheme to remove RF and baseband offsets 失效
本地振荡器馈通消除方案,以消除RF和基带偏移

  • Patent Title: Local oscillator feedthrough cancellation scheme to remove RF and baseband offsets
  • Patent Title (中): 本地振荡器馈通消除方案,以消除RF和基带偏移
  • Application No.: US11303235
    Application Date: 2005-12-16
  • Publication No.: US07697905B2
    Publication Date: 2010-04-13
  • Inventor: C. Paul LeeArya Behzad
  • Applicant: C. Paul LeeArya Behzad
  • Applicant Address: US CA San Diego
  • Assignee: Qualcomm Incorporation
  • Current Assignee: Qualcomm Incorporation
  • Current Assignee Address: US CA San Diego
  • Agent Stanton Braden
  • Main IPC: H04B1/04
  • IPC: H04B1/04
Local oscillator feedthrough cancellation scheme to remove RF and baseband offsets
Abstract:
An scheme to provide local oscillator feedthrough offset cancellation to remove baseband and radio frequency coupled offsets. Two separate offset cancellation currents are injected at a driver which drives a baseband signal into a mixer to mix with a local oscillator signal. One offset cancellation current cancels a baseband local oscillator feedthrough offset, while the other offset cancellation current cancels a radio frequency local oscillator feedthrough offset.
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