| 摘要 |
PURPOSE:To attain detection of a frequency error with high accuracy by controlling the operation and stop of frequency measurement based on a timing signal from a timing control circuit depending on a received time slot in the mobile radio equipment making the frequency stable according to a transmission wave from a base station. CONSTITUTION:The operation start and stop of a frequency counter 5 are controlled by a timing control signal from a timing control circuit 13 and a carrier signal frequency fe outputted from a demodulator 4 is compared with a preset IF frequency fc to detect a frequency error epsilon. Then a frequency error detection circuit 6 generates a frequency error compensation signal beta based on the frequency error epsilon and provides an output of the signal beta to a reference oscillator control circuit 7. The circuit 7 controls an oscillated frequency of a reference oscillator 8 based on a timing control signal from the timing control circuit 13 to compensate the frequency error of the oscillator 8 so that the detection result of the frequency error is a prescribed value or below. Thus, the frequency error is detected with high accuracy. |
