• RE: Lock time of the ADF4252

    Lock time depends on PLL loop bandwidth. Wide loop bandwidths lock quickly. Narrow ones slowly.

    Download ADIsimPLL to get an estimate of performance.

    For fast locking applications the ADF4193 is the fastest part we have.

  • Replacing ADF4154 with ADF4151 to gain lock detect and fast-lock

    Hi,

    I have a current prototype design with a ADF4154, the ability to achieve quick settling (<20us) using the fast-lock feature is critical, for production I would like to add a lock detect indication and so am considering a replacement part.

    My…

  • RE: AD9467评估板正弦波测试,频率幅值存在问题

    感谢你的提问!我们发现您的问题没有选择相应所属的论坛版块,为了让我们的工程师及时处理您的提问,请先将您的帖子移动到对应的论坛版块中。多谢!

     

  • RE: AD9762输出电流有震荡

    感谢你的提问!我们发现您的问题没有选择相应所属的论坛版块,为了让我们的工程师及时处理您的提问,请先将您的帖子移动到对应的论坛版块中。多谢!

     

  • RE: AD2S1200怎么解决四线旋变的输入问题?

    感谢你的提问!我们发现您的问题没有选择相应所属的论坛版块,为了让我们的工程师及时处理您的提问,请先将您的帖子移动到对应的论坛版块中。多谢!

     

  • RE: 求教前置放大器选型问题???

    感谢你的提问!我们发现您的问题没有选择相应所属的论坛版块,为了让我们的工程师及时处理您的提问,请先将您的帖子移动到对应的论坛版块中。多谢!

     

  • RE: PLL and evaluation selection

    If you are looking for a board similar to the EV-ADF4196SD1Z, with an on-board VCO, then look at the EV-ADF4193SD1Z.

    However, the ADF4193 and ADF4196 are quite specialized PLLs. If you are just looking for a standard PLL, then you could look at the EV…

  • RE: ADF4351

    "I understand about disabling band select (maybe) for small frequency steps, but can it be disabled while stepping through the entire frequency range above? That would be good..."

    Defeats the purpose of band select in the first place...

    My…

  • TAGS LIST: Clock and Timing

    LTC6953
    LTC6955
    LTC6957-1
    HMC6832
    HMC7043
    LTC6950
    LTC6954
    HMC987
    AD9576
    AD9508
    HMC1035
    HMC988
    HMC1033
    HMC1034
    HMC1032
    HMC1031
    ADN4670
    ADCLK944
    ADCLK950
    ADCLK948
    ADCLK846
    ADCLK954
    ADCLK946
    ADCLK854
    AD…
  • RE: 非常实用、超详细的锁相环常见问题解答~

    问题:锁相环系统的相位噪声来源有哪些?减小相位噪声的措施有哪些?

    答案:参考晶振(TCXO,VCXO)和R分频,PLL电荷泵,压控振荡器(VCO),N分频。锁相环系统的相位噪声来源于四个部分,参考输入,反馈分频1/N,电荷泵,VCO。这四部分贡献项可以用公式来表示。

    锁相环相位噪声贡献项模型

    对来说,系统闭环增益为低通特性,所以在环路带宽内,参考输入的相位噪声和N分频的噪声占很大比例(所以相同的输出频率,通过改变鉴相频率的方法并不会改善带内的相噪,因为参考源并未变化)。同样对Scp