Patent ID: 7382166
Filing Date: 2008-06-03
Classification: H03F

Abstract:
1. A signal amplification device for amplifying an input signal by automatically setting a threshold level, comprising: an offset voltage generator for detecting a direct-current level of the input signal, and generating and outputting a positive offset voltage signal or a negative offset voltage signal; a threshold controller including a peak detector for outputting the positive offset voltage signal as a peak value when a level of the positive offset voltage signal is higher than a maximum level of the input signal, and outputting the maximum level of the input signal as the peak value when the maximum level of the input signal is higher than the level of the positive offset voltage signal, a bottom detector for outputting the negative offset voltage signal as a bottom value when a level of the negative offset voltage signal is lower than a minimum level of the input signal, and outputting the minimum level of the input signal as the bottom value when the minimum level of the input signal is lower than the level of the negative offset voltage signal, and a voltage divider for subjecting the peak value output from the peak detector and the bottom value output from the bottom detector to voltage division, to generate the threshold level; and an amplifier for amplifying a differential between the input signal and the threshold level output from the voltage divider.