使用的DS1669数字控制相移

摘要：本应用简要介绍了如何控制模拟相移数字使用数字电位器和标准运算放大器（运放）的组合。它的目的是作为一个设计工程师需要实现电路的数字没有具体应用相转移例如。它提出了通用运算放大器相移的配置和如何使用数字电位器代替机械电位器或固定电阻加以实施。相移的计算公式中的应用笔记。

Application Note 184
Digitally-Controlled Phase Shift
Using the DS1669
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CONTROLLING PHASE SHIFT DIGITALLY
Altering the phase response of a signal without changing its amplitude characteristics is commonly
performed using an allpass filter, as in Figure 1. The response of this circuit is given by




A simple phase shift circuit can be implemented using an allpass filter.
Figure 1




As the signal frequency varies from DC to infinity, the phase shift will vary from 0 to +180 degrees. You
can also see that by varying R1, the phase shift at a given frequ