uW_freq_unit — Convert frequency unit in scaling factor to get a frequency in Hertz.
k=uW_freq_unit(unit)
String parameter : the unit of the frequency ("GHz" for example).
Real parameter : the scaling factor of the frequency (10^9 for example).
This function convert a string frequency unit into a scaling factor to get the frequency in Hz .
-->uW_freq_unit("GHz") ans = 1.000D+09
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