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ADS中函数unwrap()的用途
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ADS中有函数unwrap函数应该怎么解释,它有个帮助文档,但是没有看懂,哪位大哥大姐有谁能够通俗的解释一下!最好能举个例子。谢谢了!
unwrap is usually use on the phase of S-parameters. Say if you measure a transmission line over frequency, the phase of S21 goes from 0 to +180, then jumps to -180 and goes to +180, etc. If you use unwrap, the phase of S21 will goes from 0 to 360 and up.
why they want to unwrap the phase? probably to calculate the group delay. If there is a jump in phase, then the group delay will jump everytime it switches from +180 to -180.
谢谢楼上的回复!
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