| 摘要 |
There is provided a band switchable type tuning circuit in which, when a switch diode for band switching is turned on, a large current flows, and when the switch diode is turned off, a reverse bias voltage becomes large. The band switchable type tuning circuit has first switch means 4 interposed between a power supply Vcc and an anode of a switch diode 2f, a first resistor 6 whose one end is connected to a cathode of the switch diode 2f, second switch means 7 interposed between the other end of the first resistor 6 and a ground, a second resistor 8 connected between the power supply Vcc and a connection point of the first resistor 6 and the second switch means 7, and the third resistor 5 connected between the ground and a connection point of the first switch means 4 and the anode of the switch diode 2f. The first switch means 4 and the second switch means 7 are turned on or off together by means of a band switching voltage. <IMAGE>
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