| 摘要 |
There is provided a method of controlling calibration of a sleep clock 20 by a master clock 18 within the mobile device 10 e.g. GSM handset. The method includes determining the drift between an air interface timebase contained in a received signal 30 and the local timebase 14, which in sleep mode is controlled by the 32Khz slow sleep clock. During active periods, the timebase is driven by higher power consumption high frequency clock 18. The slow sleep clock 18 is calibrated if the drift exceeds a threshold, for example one symbol width. |
