| 摘要 |
PURPOSE:To generate an excellent FSK modulation wave, by inputting a signal different from frequency to a PLL according to a mark and a space of an input data. CONSTITUTION:An output of a mark frequency oscillator 1 and an output of a space frequency oscillator 2 are given to a phase comparator 6 according to the mark/space of the input data at a switching device 3 and an FSK modulation wave is obtained at an output of a band pass filter 9. Since the frequency of one voltage controlled oscillator 8 is changed, the phase is continuous even in a change from mark to space and vice versa. Thus, excellent FSK modulation can be achieved. |
