| 摘要 |
a T-shape circuit having a first resistor, a second resistor connected to the first resistor, and a third resistor connected in parallel to the second resistor; a first switch for connecting an input terminal of the first resistor and an output terminal of the third resistor; and a second switch for connecting the second resistor to a ground terminal, wherein each of resistance values of the first and third resistors, fourth and sixth resistors, seventh and ninth resistors, tenth and twelfth resistors, and thirteenth and fifteenth resistors is the same to have the same 900Ω characteristic impendence at input/output terminals, and a first resistance value of the upper portion of the T-shape circuit(the first resistor, the fourth resistor, the seventh resistor, the tenth resistors, and the thirteenth resistors) is over a second resistance value(the second resistor, the fifth resistor, the eighth resistor, the eleventh resistor, and the fourteen resistor.
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