计算延时线的最高工作频率

[09-12 12:18:38]   来源:http://www.88dzw.com  电路基础   阅读:8135

文章摘要:Calculating Maximum Frequency for an Application计算应用程序最大频率 For programmable delay lines : if a delay higher than the minimum delay is required, then the minimum pulse width allowable is calculated as:对于可编程延时线 :如果拖延高于最低延迟要求较高,则允许的最小脉冲宽度计算公式为: Minimum Pulse Width = Maximum Step-Zero Delay + Programmed

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Calculating Maximum Frequency for an Application计算应用程序最大频率

For programmable delay lines : if a delay higher than the minimum delay is required, then the minimum pulse width allowable is calculated as:对于可编程延时线 :如果拖延高于最低延迟要求较高,则允许的最小脉冲宽度计算公式为:

Minimum Pulse Width = Maximum Step-Zero Delay + Programmed Delay.最小脉冲宽度=最大步零延迟+程序延迟。

The maximum allowable frequency can then be calculated using Equation 1.最大允许的频率可以被计算公式1。

Example for Programmable Delay Lines 示例可编程延时线
  1. Device used: DS1020-100设备使用:DS1020 - 100
    Desired delay: 25ns期望延迟时间:25ns
    Minimum pulse width = 25ns + 12ns = 37ns最小脉冲宽度= 25ns的+ 12ns = 37ns
    Maximum allowable input frequency = 1/(2 × 37ns) = 18.52MHz最大允许输入频率= 1 /(2 × 37ns)= 18.52MHz
  2. Device used: DS1023-500设备使用:DS1023 - 500
    Desired delay: 60ns期望延迟:60纳秒
    Minimum pulse width = 22ns + 60ns = 82ns最小脉冲宽度= 22ns + 60纳秒= 82ns
    Maximum allowable input frequency = 1/(2 × 82ns) = 6.1MHz最大允许输入频率= 1 /(2 × 82ns)= 6.1MHz
For non-programmable delay lines : the minimum pulse width is independent of the delay tap used and, hence, remains the same as in Table 2.对于非可编程延时线 :最小脉冲宽度是独立的延误塔,因而仍是如表2相同。

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