| 摘要 |
PURPOSE:To easily control the width of a rectangular wave by dividing the output of a rectangular wave generator into two, using the one as it is and inverting the phase of the other, giving them to LPFs and feeding back the output difference of both LPFs to the input bias voltage of an oscillator. CONSTITUTION:An input signal from an input terminal 1 is inputted to a rectangular wave generating circuit 3 while being given a bias by a resistor 12 via a capacitor 2. The generated rectangular wave is divided into two, one is given to the LPF 5 as it is and the other is given to the LPF 6 while the phase is inverted. The outputs of both LPFs 5, 6 are given to a comparator 7. The comparator 7 consists of a comparing device 8, a duty ratio adjusting variable resistor 9, a resistor 10 and a capacitor 11 and its output is fed back to an input bias through the resistor 12. Thus, the duty ratio of a rectangular wave is adjusted easily. |
