| 摘要 |
PURPOSE:To obtain an oscillation circuit with high reliability with simple constitution by which oscillation output can be surely obtained and part of which can be operated even when a fault occurs by connecting plural oscillation circuits with a coupling medium. CONSTITUTION:When a crystal oscillator is used as the coupling medium, the resonance frequency of the crystal oscillator changes from inductance to capacitance between neighboring frequencies f1 and f2. Therefore, when the plural oscillation circuits are operated normally, the oscillation circuits are coupled with each ether with low impedance by the capacitance neighboring to the frequency f1, and when one oscillation circuit is stopped, high impedance is obtained by changing to the inductance neighboring to the frequency f2. Thereby, it is possible to obtain the oscillation circuit with in-phase synchronism at a normal state and the output one the other side of which is normal even when the fault occurs in one oscillation circuit. |
