amplitude of FFT for chirp function with changing amplitude

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Bob GH
Bob GH 2013-6-3
Hi all. I have a output as uploaded image1( http://testybab.blogspot.com/2013/06/fft-peoblem.html ). actually, i should take a Fast Fourier Transform of this output but i got exactly twice of desired amplitude and for phase, i got image2 (<http://testybab.blogspot.com/2013/06/fft-peoblem.html>) that obviously wrong.
Please help me

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