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開關(guān)穩(wěn)壓器的偏置低噪聲變?nèi)?/h1>

資源大小：431 K
上傳時間： 2013-12-20
上傳用戶：zhonghua9613
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標(biāo) 簽： 開關(guān)穩(wěn)壓器低噪聲
資源簡介

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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  資源簡介：? 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 o...
  
  標(biāo)簽： 開關(guān)穩(wěn)壓器低噪聲變?nèi)?/font>
  
  上傳時間： 2013-12-20
  
  上傳用戶：ABCDE
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