| 摘要 |
PURPOSE:To enable simple constitution with less number of circuit elements and to reduce dispersion in delay time, by confirming the phase relation of each frequency dividing output with logic circuits so that the relation is always as specified relation. CONSTITUTION:The output of a VCO in which the output frequency is a prescribed frequency, 228kHz, is inputted to a buffer 28 to input the output of the buffer 28 to a 1/6 frequency-divider consisting of T-FF21-23 and D-FF24, allowing to obtain two types of frequency-divided outputs different in the phase with 1/6 duty. The two types of frequency-division outputs are inputted to an RS latch 25 to output the 1/6 frequency division output in duty 50% from the latch 25. The output of the FF21 and the output of the FF24 are ANDed to obtain a 1/2 frequency-division output having different phase relation with 1/6 frequency-division output waveform with duty 50%. The 1/6 frequency-division output and the 1/2 frequency-division output being the output of the latch 25 are inputted to the D-FF26, 27 respectively to delay them by taking the frequency of the VCO output as clock, and synchronized 1/6 and 1/2 frequency division outputs are outputted for switching. |
