DIGITAL-TO-ANALOG CONVERTER OF CURRENT-STEERING METHOD USING FREQUENCY SENSING CIRCUIT

摘要

PURPOSE: A digital-to-analog converter of a current-steering method using a frequency sensing circuit is provided to reduce glitch energy in an output terminal of a digital-to-analog converter by reducing a clock-feedthrough phenomenon and a charge-injection phenomenon. CONSTITUTION: A switch driving circuit unit(300) drives a digital-to-analog differential switch by using a frequency detection circuit according to the control of a frequency detection circuit(100). The frequency detection circuit transfers a control signal for driving a switch driving circuit unit according to the high speed and low speed state of the input signal. The frequency detection circuit includes a comparison unit, a detection unit, a first buffer unit, an electric charge bump circuit and a second buffer unit.