| 摘要 |
PURPOSE:To reduce the leading time of a crystal oscillator reaching the stable oscillation by providing two sets of crystal oscillation circuits using the crystal oscillator in common and connecting the crystal oscillator switchingly to the circuits. CONSTITUTION:An oscillation circuit switching relay 10 is changed over to the oscillating circuit (a) side to form the 1st crystal oscillation circuit and to make the crystal oscillator 5 into a stable state. A power supply voltage is applied to an oscillating circuit (b). While the oscillator 5 keeps oscillation in the oscillating circuit (a) by the relay 10, the circuit (c) is changed over to the oscillating circuit (b) to form the 2nd crystal crystal oscillating circuit. As a result, the leading time of the crystal oscillator 5 reaching the stable oscillation is reduced remarkably. |
