Patent ID: 8564374
Filing Date: 2013-10-22
Classification: H03L

Abstract:
1. An oscillator calibration apparatus, comprising: a counter, for receiving a first clock signal and a second clock signal, and utilizing the first clock signal to sample the second clock signal to generate at least one counting value, where the first clock signal is generated from a first oscillator, and the second clock signal is directly outputted from a second oscillator different from the first oscillator; a comparator, coupled to the counter, for comparing the counting value with a predetermined value to generate at least one calibration signal; and an adjusting unit, coupled to the comparator, outputting a signal to the second oscillator for adjusting a frequency of the second oscillator directly according to the calibration signal; wherein the comparator utilizes a comparison ratio to adjust the counting value to generate an adjusted counting value, and the comparator compares the adjusted counting value with the predetermined value to generate the calibration signal.