| 摘要 |
PURPOSE:To keep the DC level constant even if a clock is fluctuated by dividing one period into two, giving data deciding the form of a sawtooth wave and forming one data as a function of the other data and a count value at that time. CONSTITUTION:A counter 7 inputs the 2nd data D2 generated by the 2nd data generating section 5b by an output of the 2nd load signal generating circuit 4. As the 2nd data D2, the 1st data D1 and 2D1-(Q+1) as a function of a value Q+1 adding 1 to the count output Q are used. The 1st data D1 is loaded on the counter 7 by an output of the 1s load signal generating circuit 3. Since both load signals are in the relation of opposite phase and the same period, the two data decide the shape of the sawtooth wave during one period. Thus, the counter value reaches a point (DC level) at the center of slope when the 1st load signal is inputted by inputting the said value as the data D2. |
