ADAPTIVE CIRCUIT FOR DIVIDING IMPEDANCE AND FEEDBACK CIRCUIT EMPLOYING THE SAME

摘要

PURPOSE: An adaptive impedance division circuit and a feedback circuit using the same are provided to reduce output signal distortion regardless of output signal level change by comparing an input signal and an output signal which is converted into the input signal level by matching the output signal to the input signal level. CONSTITUTION: An adaptive impedance division circuit includes a fixed impedance unit (110), variable impedance unit (120), low pass filter unit (130), and control unit (140). The fixed impedance is connected between an input terminal and an output terminal. The variable impedance unit is connected between the output terminal and a ground. The low pass filter unit generates a DC voltage from an output voltage. The control unit adaptively controls the impedance of the variable impedance unit based on a standard voltage and the DC voltage in order to normalize the output voltage. [Reference numerals] (110) Fixed impedance unit; (120) Variable impedance unit; (130) Low pass filter unit; (140) Control unit; (AA) Variable voltage; (BB) Output voltage; (CC) DC voltage; (DD) Standard voltage