| 摘要 |
PURPOSE:To improve the stability of an output signal frequency, by adding a subvoltage variable type oscillating circuit of high stability and automatically stabilizing a main voltage variable type oscillating circuit automatically with negative feedback. CONSTITUTION:Frequency difference (fX-fS) between an output frequency fX of a tracked signal source 1 and an output frequency fS of a subvoltage variable type oscillating circuit 16 is outputted from a frequency difference output circuit 2 and it is applied to the 1st input terminal of a frequency discriminating circuit 13. The circuit 13 produces a voltage proportional to the detuning frequency between an internal discriminating center frequency fID and the (fX-fS), and it is applied to the circuit 16 to control fS automatically to the (fX-fS). An output frequency fm of a main voltage variable type oscillation circuit 14 is a frequency of the sum between the internal discriminating center frequency fID and an output frequency (fX-fID) of the oscillation circuit 16, that is, a frequency equal to the output frequency fX of a signal source 1, and it is outputted from a power distributor 5. |
