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The Principle of FFT in PNA network analyzer time domain Opt

Question asked by ttrreewwqq on Aug 17, 2006
Latest reply on May 27, 2011 by Dr_joel
the option 010(time domain) of na network analyzer can transform a frequency data to time domain using IFFT,and transform time domain data to frequency domain using FAT.But when I use the data to do transform in my personal computer using the software Matlab, I cannot acquire the right result.Can you tell me the principle of gnaw transform?How to deal with the length of data smaller than 2^N?