Patent ID: 6587004
Filing Date: 2003-07-01
Classification: H03F,H03G,H04B

Abstract:
A signal amplifier comprising:a first level detector for detecting a direct voltage level of a normal phase signal; a first adder for adding an inverse phase signal to a detection output of said first level detector; a second level detector for detecting a direct voltage level of said inverse phase signal; a second adder for adding said normal phase signal to a detection output of said second level detector; and a differential amplifier for differential-amplifying outputs of said first adder and said second adder, wherein said first level detector includes: a first peak detector for detecting the maximum value of said normal phase signal, a first bottom detector for detecting a relatively minimum value of said normal phase signal referenced from a detection level of said first peak detector, and a first voltage divider for dividing the voltages between detection outputs of said first peak detector and said first bottom detector; and wherein said second level detector includes: a second bottom detector for detecting the minimum value of said inverse phase signal, a second peak detector for detecting a relatively maximum value of said inverse phase signal referenced from a detection level of said second bottom detector, and a second voltage divider for dividing the voltages between detection outputs of said second bottom detector and said second peak detector.