Patent ID: 9306680
Filing Date: 2016-04-05
CPC Classification: H04B

Claim Text:
1. A method for calibrating a frequency synthesizer in a communication terminal, comprising: controlling the communication terminal to transmit a continuous wave signal in a specified channel, wherein the continuous wave signal is a non-modulated signal; controlling a measurement device to measure the continuous wave signal to obtain a measured frequency deviation value of the frequency synthesizer in the communication terminal; calculating a center oscillation frequency point of a reference crystal oscillator of the communication terminal and a frequency calibration step corresponding to the center oscillation frequency point based on the measured frequency deviation value; and storing the center oscillation frequency point and the corresponding frequency calibration step in the communication terminal, wherein controlling the measurement device to measure the continuous wave signal to obtain the measured frequency deviation value of the frequency synthesizer in the communication terminal comprises: controlling the measurement device to receive the continuous wave signal in a predetermined period; measuring two output frequencies, where the two output frequencies are output by the communication terminal respectively under control of two different frequency control words; calculating two frequency differences between each of the two measured output frequencies and a frequency of the continuous wave signal; and reporting the two frequency differences as the measured frequency deviation value; and wherein calculating the center oscillation frequency point of the reference crystal oscillator of the communication terminal and the frequency calibration step corresponding to the center oscillation frequency point comprises: calculating the corresponding frequency calibration step of the reference crystal oscillator under the center oscillation frequency point, based on a difference between the two frequency differences and a difference between the two different frequency control words.