计算延时线的最高工作频率

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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