FREQUENCY RESPONSE CONTROL UNIT USING IMPEDANCE SCALING METHOD, IN WHICH THE FREQUENCY RESPONSE OF FILTER IS CONTROLLED

摘要

PURPOSE: A frequency response control unit using an impedance scaling method is provided to scale a small impedance element as a large impedance value by controlling a duty ratio of a clock applied to a switch connected to an impedance element. CONSTITUTION: A frequency response control unit using an impedance scaling method includes a filter and a duty ratio controller. The filter(400) is used for removing a predetermined frequency element from an input signal and generating an output signal. The filter includes a first impedance element and a switch. The switch is serially connected to the first impedance element and is switched by a duty-controlled clock. The duty ratio controller(100) is used for receiving a clock signal, controlling a duty of the clock signal, and generating the duty-controlled clock.