Patent ID: 7015747
Filing Date: 2006-03-21
Classification: H03H

Abstract:
1. A device for controlling a frequency response comprising: a filter, wherein the filter generates an output signal after removing a frequency from an input signal, the filter comprising a first impedance component and a switch that is connected to the first impedance component, wherein the switch is switched on or off in response to a duty-controlled clock signal; and a duty ratio controller, wherein the duty ratio controller receives a clock signal and a duty control signal for selectively adjusting the duty-controlled clock signal, controls a duty ratio of the clock signal, and generates the duty-controlled clock signal; wherein the duty ratio controller comprises: a flip-flop that receives a delayed signal after obtaining the clock signal by a time delay; and a delay component that receives the clock signal, generates the delayed signal, and controls the time delay in response to the duty control signal.