公开(公告)号：US20120306580A1

公开(公告)日：2012-12-06

申请号：US13484405

申请日：2012-05-31

Applicant: Andrew ELLIS

Inventor： Andrew ELLIS

IPC: H03L7/00

CPC classification number: G04G3/027 ,  G04G3/04

Abstract: An electronic device has two oscillators, for example a first highly accurate crystal oscillator and a second less accurate low power oscillator. In a normal mode of operation, time is counted based on an output from the crystal oscillator, but in a low power mode of operation, time is counted based on an output from the less accurate oscillator. During the low power mode of operation, a calibration process is performed repeatedly. During a first calibration time period the second oscillator is calibrated against the first oscillator to obtain a first calibration result, and a recalibration is performed during a second calibration time period to obtain a second calibration result. A correction factor is determined from the first and second calibration results, and the correction factor is applied when subsequently counting time based on the output from the second oscillator.

Abstract translation: 电子设备具有两个振荡器，例如第一高精度晶体振荡器和第二较不精确的低功率振荡器。 在正常工作模式下，时间根据晶体振荡器的输出进行计数，但在低功耗工作模式下，时间是根据较不精确的振荡器的输出进行计数的。 在低功率运行模式下，重复执行校准过程。 在第一校准时间段期间，第二振荡器针对第一振荡器进行校准以获得第一校准结果，并且在第二校准时间段期间执行重新校准以获得第二校准结果。 根据第一和第二校准结果确定校正因子，并且当基于来自第二振荡器的输出的后续计数时间时应用校正因子。