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開關穩壓器的偏置低噪聲變容

  • 資源大小:431 K
  • 上傳時間: 2013-12-20
  • 上傳用戶:zhonghua9613
  • 資源積分:2 下載積分
  • 標      簽: 開關穩壓器 低噪聲 變容

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Telecommunication, satellite links and set-top boxes allrequire tuning a high frequency oscillator. The actualtuning element is a varactor diode, a 2-terminal device thatchanges capacitance as a function of reverse bias voltage.1 The oscillator is part of a frequency synthesizingloop, as detailed in Figure 1. A phase locked loop (PLL)compares a divided down representation of the oscillatorwith a frequency reference. The PLL’s output is levelshifted to provide the high voltage necessary to bias thevaractor, which closes a feedback loop by voltage tuningthe oscillator. This loop forces the voltage controlledoscillator (VCO) to operate at a frequency determined bythe frequency reference and the divider’s division ratio.

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