Patent ID: 7778233

Claim:
A time synchronizing apparatus for a mobile WiMAX analyzer, comprising: a Global Positioning System (GPS) receiver for outputting a GPS signal that is synchronized with GPS time using information received from a GPS satellite; and a synchronization control unit for comparing the GPS signal, which is received from the GPS receiver, and a reference signal, which is generated using an internal clock, and controlling synchronization according to the result of the comparison; wherein the synchronization control unit comprises: an oscillator for outputting an oscillation signal having a predetermined frequency, which is used as an internal clock source; a divider for dividing the oscillation signal, which is output from the oscillator, to generate the reference signal, which has a frequency lower than that of the oscillation signal; an offset comparison unit for comparing differences between the GPS signal, which is received from the GPS receiver, and the reference signal, which is generated by the divider, and outputting a result value of the comparison; and a processor for controlling an oscillation frequency of the oscillator until the result value output from the offset comparison unit satisfies a predetermined reference value; wherein each of the GPS signal and the reference signal is a 1 PPS signal, and when the GPS signal or the reference signal is received, the offset comparison unit starts counting based on the oscillation signal output from the oscillator, latches a count number reached until the GPS signal or the reference signal is received again, and then outputs the count number as the result value.