| 摘要 |
PURPOSE:To increase a response speed required for conversion to an analog signal, by adding a comparator, a converter and a matrix synthesizing circuit. CONSTITUTION:Information stored in RAM6 is outputted as the 1st PWM signal OUT1 from a converter 3 via a comparator 4. Information read out newly from the RAM6 is outputted as the 2nd PWM signal OUT2 from a converter 12 via a comparator 11. A matrix synthesizing circuit 13 inputting both the outputs varies its output voltage rapidly to a reference voltage according to the difference in pulse width between those inputs, i.e. when the pulse width of the signal OUT2 is greater than that of the signal OUT1, or to the earth voltage in the reverse case. A response speed required for converting the PWM signal into an analog signal through an integral filter, specially when the duty ratio varies is increased. |
