{TAIL ~ A further aspect} of the present invention is to provide an apparatus and {HEAD ~ method} for automatically adjusting a Gain Bandwidth product of a linear amplifying stage so as to process an input envelope signal having a wide bandwidth 
{ TAIL ~ A further aspect } of the present invention is to provide an apparatus and { HEAD ~ method } for automatically adjusting a Gain Bandwidth product of a linear amplifying stage so as to process an input envelope signal having a wide bandwidth
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