DEVICE FOR CONTROLLING VOLTAGE CONTROLLED TEMPERATURE COMPENSATED CRYSTAL OSCILLATOR FOR GENERATING MULTIPLE FREQUENCIES IN WIRELESS TERMINAL AND METHOD THEROF

摘要

PURPOSE: A device for controlling a voltage controlled temperature compensated crystal oscillator for generating a multiple frequency is provided to convert a voltage inputted to the voltage controlled temperature compensated crystal oscillator according to a band selection through a scaler and a switch, so as to generate a stable multiple frequency and to satisfy a static timing offset in each band. CONSTITUTION: A direct current converter(120) converts an inputted PDM(Pulse Density Modulation) signal into a serial signal. A scaler(130) scales the serial signal according to a determined control signal, and outputs the scaled serial signal under a descent voltage state or outputs the serial signal inputted from the direct current converter(120). A voltage controlled temperature compensated crystal oscillator(100) generates a variable frequency according to an outputting signal of the scaler(130). A controller(110) generates a control signal according to a band selecting signal.