| 摘要 |
PURPOSE:To reduce the cost of an IC due to the reduction in size of a chip by reducing the number of components in the IC by employing a digital filter. CONSTITUTION:A reference pulse is inputted to A of a digital phase control circuit 6, and a rotary phase signal of a motor is inputted to the B. On the other hand, a digital filter is composed of multipliers 20, 21, 23, 32, a delay holder 22, adders 26, 27, 28 and a sampler 30. The adder 28 adds the output of a digital speed control circuit 5 and the output of the multiplier 20, converted by a digital-to-analog converter 31 to an analog value and used as the control output of the motor |
