| 摘要 |
a ROM(11) in which an output of a linear function is stored as a program; a multiplier(12) connected to an output terminal of the ROM, for multiplying an output signal of the ROM by numbers designated by a frequency command unit; an adder(13) for adding an output signal of the multiplier and an input signal at the other side terminal to compensate a phase error; a first mode(14) connected to an output terminal of the adder, for converting the input signal to a period function; a phase detector(15) for comparing an output signal from the first mode and a signal phase inputted to the other side terminal to output a phase error function; a second mode(16) connected to an output terminal of the phase detector; a digital/analog converter(17) for converting an output voltage of the second mode into an analog signal; a voltage control oscillator(21) connected to an output terminal of the digital/analog converter, for generating a frequency proportional to the input voltage; a module counter(18) for transforming an output signal of the voltage control oscillator into a low frequency of a rectangular wave; and a phase controller(19) connected between the phase detector and the adder, for calculating the transformed difference of the phase detector to apply the calculated result to the adder.
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