| 摘要 |
PURPOSE:To obtain a system with the high degree of freedom which is capable of easily and exactly changing output characteristic and easily adjusting the switching point between a normal rotation direction and a reverse rotation direction. CONSTITUTION:A digital conversion is performed for an analog input in an A/D converter 12 and the reading address input of the lower bit group of a data converter 13 is performed for the analog input. In the upper bit group of the data converter 13, control data determining data conversion characteristic is inputted from a switch group 35. An analog conversion is performed for read data in a D/A converter 14, and the data is inputted in a comparator 18a or 18b via an analog switch 15a or 15b and is compared with a triangular wave. The comparison result becomes pulse width modulation wave, and it is supplied to a current amplifier 20a or 20b and becomes the output of a control signal. A comparator 31 and a switch group 32 obtain the selection output of analog switches 15a, 15b. |
