how to transform frequency domain data to time domain data

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6latchu

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I have frequency domain data from 20Mhz to 1.5 Ghz at frequency interval of 20MHz. how to convert the this data to time domain data with proper AXIS conversion. please any help me
 

thank u very munch for giving reply..

but what my problem is that... i have data at different frequrncies...i.e.,

20MHz - 0.2+1j v
40MHz - 0.5-0.2j v
...................
1.5Ghz- 8-1j v (total 75 samples)

After i converting this data to time domain using ifft. But what the problem is that how to represent the X-axis values in time domain properly.

please suggest how to do this one
 

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