| 摘要 |
PURPOSE:To obtain a highly linear voltage/frequency converter circuit by applying DC voltage signals having a different polarity to the positive and negative inputs of an integrated circuit alternately. CONSTITUTION:A DC signal applied to a terminal 10 which is to be converted into a frequency is converted to signals ep, en having different polarity and the same voltage and these signals ep, en are applied to the positive and negative inputs of the integrated circuit 17 alternately through a switching circuit 15. The positive input of the integrated circuit 17 is applied through a voltage dividing circuit 27 and the integrated circuit 17 outputs a voltage signal of which inclination direction with different inclination angles in accordance with positive and negative input signals and the position of the switching circuit 15 is changed up and down alternately. An output circuit consisting of comparators 21, 22 and an FF23 generates an output signal inversed every time that the output voltage of the integrated circuit 17 reaches a positive or negative prescribed value as a converted frequency signal and inverts the position of the switching circuit 15 every inversion of the output signal. If the voltage division value of a voltage divider 27 is set up with relation to the integrated capacity C and a resistor R3, the shown circuit is improved to a highly linear one. |
