| 摘要 |
PURPOSE:To obtain easily an output signal of a desired and optional characteristic by detecting a phase difference between two signals and processing an error signal digitally. CONSTITUTION:A counter 11 counts a clock signal CL generated while an FF circuit 12 is set by a reference frequency signal FR and reset by a comparison frequency signal FO. An output of the counter 11 responds to a phase difference between the reference frequency signal FR and the comparison frequency signal FO. Then the output of the computer 11 is given to a data converter 13, which converts data based on a prescribed characteristic. After the phase error signal from the converter 13 is converted by a D-A converter 14, the signal is outputted as an analog signal via an LPF15. The output signal of a desired optional characteristic is obtained easily in this way. |
