Many dynamic calibration apparatus in the frequency domain can not give the phase-frequencyresponse of the tested system.
许多频率域动态校准装置只能给出被校系统的幅频特性，缺乏相频特性。
2
As another example, the logic state of the select signal can be changed in response to a change in the power supply voltage provided to the phasefrequency detector.
作为另一个示例，选择信号的逻辑状态可响应于提供给脉冲频率检测器的电源电压的变化而改变。
3
Then, the phase estimator can further determine the phase of frequencyresponse of OFDM channel.