| 摘要 |
PURPOSE:To eliminate the deterioration in S/N of a synthesizer output and to prevent the rise of an output signal from being retarded by supplying an output of a stabilizing power circuit to a voltage controlled oscillator via a low pass filter. CONSTITUTION:A synthesizer section 10 is fed from a stabilizing power supply circuit 6 and active, and a low pass filter 8 is inserted between the stabilizing power supply circuit 6 and a voltage controlled oscillator 4. The base of the low pass filter 8 is made up of an emitter follower connection transistor (TR) whose base is connected to ground via a capacitor C, and whose collector and base are connected to a parallel circuit comprising a resistor R and a diode D inbetween. Thus, a power noise is blocked, the S/N of the synthesizer output is not deteriorated, and since the low pass filter 8 is of emitter follower type, the rise of the synthesizer output is not retarded. |
