| 摘要 |
The difference in phase between a first and a second electrical signal at substantially the same frequency is detected in an interval of 360 DEG . Both the first and the second signals are used as input signals to a first and a second device unambiguous detection of phase differences in an interval of 180 DEG , and one input signal to the first detection device is phase-shifted ninety degrees. The output signal from the first phase detection device is used in order to indicate whether the output signal from the second phase detection device corresponds to a phase difference that is greater or smaller than 180 DEG . Also, the output signal from the second phase device is used in order to produce, with the aid of the output signal from the first phase detection device, an output signal that indicates unambiguously, in an interval of 360 DEG , the value of the phase difference between the first and the second input signal. |
