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