| 摘要 |
PURPOSE:To improve the signal-noise ratio and to form easily an oscillator of broad band, by arranging a plurality of voltage-controlled oscillation circuits having overlapped oscillation frequency zones and switching them. CONSTITUTION:The output of voltage-controlled oscillation circuits 2, 2', 2'' is given to an output terminal 4 via a diodes 3, 3', 3'', respectively and frequency control terminals are used in common. The circuit 2 oscillates signals in the range of 900-925MHz, the circuit 2' oscillates signals in 920-945MHz, and the circuit ''2 oscillates signals in 940-965MHz, respectively. For example, in outputting the signal in 930MHz, the switch 1 gives a power supply to the circuit 2', the diode 3' is set on with an internal circuit of the circuit 2' and the signal in frequency 930MHz is outputted. |
