{HEAD ~ A further aspect} of {TAIL ~ the present invention} is to provide an apparatus and 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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{ HEAD ~ A further aspect } of { TAIL ~ the present invention } is to provide an apparatus and 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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