| 摘要 |
PURPOSE:To set accurately and easily the slope by using an output current of a current output type digital/analog converter so as to charge a capacitor. CONSTITUTION:The slope of a ramp (sawtooth wave) output voltage is set numerically by a digital switch SR1. When a start signal is inputted from a switch S2 to a control processing section CP1, a switch S1 is opened and also a current proportional to the set value of a switch SR1 is outputted from the current output type digital/analog converter (DAC)DA1. A capacitor C1 is charged at a slope set by the switch SR1 by the current from the converter DA1. Since the capacitor C1 is charged by 2<n> kinds of current values when the switch SR1 sets a numeral of binary n-bit, the slope of the ramp voltage is adjusted accurately and minutely. |
