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计算延时线的最高工作频率来源于瑞达科技网 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
作者:佚名 文章来源:网络 点击数 更新时间:2011/1/18 文章录入:瑞达 责任编辑:瑞达科技 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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计算延时线的最高工作频率 摘要:延迟线在应用中要求一个(纳秒),或者增量时间更正为系统正常工作所需的几纳秒信号延迟。 This application note discusses the maximum frequency that the input signal could have, and the maximum delay that can be obtained. 本应用指南讨论了最高频率的输入信号可以,最大的延迟可以得到。 Calculating Maximum Input Frequency计算最大输入频率When calculating the maximum input frequency, the critical parameter to consider is the minimum pulse width of the input signal.当计算的最大输入频率,最重要的参数要考虑的是输入信号的最小脉冲宽度。 For periodic signals with a 50% duty cycle, the minimum pulse width would be half the period of the signal.对于具有50%的占空比,最小脉宽周期信号将一半的一段期间的信号。 This value, in turn, determines the maximum possible delay.此值,从而决定了最大可能延误。 Sometimes the input is periodic with a low frequency, but with a duty cycle of less than 50%.有时,是周期性的输入与低频,但低于50%的占空比。 In this case, the width of the minimum duration between transitions (t WI ) on the input determines the minimum pulse width ( Figure 1 ).在这种情况下,之间的转换(吨威斯康星州 )最短的输入宽度确定最小脉宽( 图1)。 In a number of devices, the minimum-input pulse width possible is specified as 100% of the maximum output delay desired (if not explicitly specified).在许多设备,最小输入脉冲宽度可能被指定为100%,最高产量所需的延迟(如果没有明确规定)。 The maximum output delay for these devices is, therefore (conversely), the same as the minimum-input pulse width.这些器件的最大输出延迟,因此(反过来),在相同的最低输入脉冲宽度。Figure 1. 图1。 Illustration shows how the minimum duration between transitions (t WI ) of the input signal determines the maximum possible delay. 图显示与输入信号的转换(吨威斯康星州 )最低期限确定最大的延误。 Maximum Input Frequency for Programmable Delay Lines最大输入频率为可编程延时线The specifications to consider for programmable delay lines are found in the product data sheet:这些规范考虑可编程延时线是在产品数据表中:
Table 1 gives some examples of the maximum allowable frequency for various devices. 表1给出了最高频率的各种设备允许的一些例子。 Table 1. 表1。 Maximum Input Frequencies for Programmable Delay Lines 最大输入频率为可编程延时线
Maximum Input Frequency for Nonprogrammable Delay Lines最大输入频率为不可编程延时线For nonprogrammable delay lines, the specifications to consider are also found in the product data sheet:对于不可编程延时线,规格也考虑在产品数据表中:
Table 2 shows some examples of the maximum allowable frequency for various nonprogrammable devices. 表2显示了不同的最高允许的频率不可编程器件的一些例子。 Table 2. 表2。 Maximum Input Frequencies for Nonprogrammable Delay Lines 最大输入频率为不可编程延时线
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
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