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import numpy as np
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import matplotlib.pyplot as plt
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g = np.logspace(1, 8, 1000)
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g_lna = 10**(16./10.)
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f_lna = 10**(3./10.)
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f_mixer = 10**(12.8/10.)
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f_tot = f_lna + (f_mixer - 1.)/(g*g_lna)
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nf_tot = 10*np.log10(f_tot)
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plt.semilogx(g, nf_tot)
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plt.show()
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