| 摘要 |
PURPOSE:To make the automatic start at the oscillation stop time posible, by using an R-S flip-flop and a delay circuit to constitute a monostable oscillator for controlling a switch circuit in a voltage control variable frequency oscillator of the pulse feedback system. CONSTITUTION:When a comparator 1 outputs ''1'' by the rise of the charging voltage of a capacitor 3, a flip-flop 8 is set, and a switch 6 is made conductive for a constant time. Thus, the charge of the capacitor 3 is discharged, and the voltage drops. After that, the capacitor 3 is charged again simultaneously with the end of conduction of the switch 6, and charging and discharging of the capacitor 3 due to the operation of the comparator 1 are repeated. The discharging time of the capacitor 3 is then regulated by a monostable oscillator 7, and the charging characteristic is regulated by current sources 4 and 5. If the oscillating operation stops, the capacitor 3 is charged or discharged in accordance with a charging voltage V+ of the capacitor 3 to transfer the oscillator to the steady operation mode. |
