| 摘要 |
PURPOSE:To stably generate the oscillating output of a desired frequency with high accuracy even when a fault takes place in an oscillation circuit by using two multipliers so as to multiply outputs of two oscillators, supplying the resulting output to each filter and producing only a desired frequency component as an output. CONSTITUTION:Outputs cos(omega1+theta1) and cos(omega2+theta2) are multiplied respectively by multipliers 23, 24 in the normal state and the resulting output is fed respectively to high pass filters 25, 26. The output cos(omega1+omega2)t of the high pass filters 25, 26 is amplified respectively by amplifiers 27, 28 and Acos(omega1+omega2)t is outputted respectively to output terminals 29, 30. When the multiplier 23 is faulty and no multiplication is enabled, the oscillation output of Acos(omega1+omega2)t is not obtained at the output terminal 20 but the multiplier 24 is normally operated, then the oscillated output of Acos(omega1+omega2)t is obtained at the output terminal 30. |
