| 摘要 |
A resistor string circuit, which is for use in a D/A converter or an A/D converter, has a first resistor string 11 and a second resistor string 12. The first resistor string 11 is connected between a ground potential point Vss and a reference potential point Vref and has resistor elements R11 to R18 connected in series to one another. Likewise, the second resistor string 12 is connected between a ground potential point Vss and a reference potential point Vref and has resistor elements R21 to R28 connected in series to one another. The ground potential point Vss of the second resistor string 12 is located in the vicinity of the reference potential point Vref of the first resistor string 11, and the reference potential point Vref of the second resistor string 12 is located in the vicinity of the ground potential point Vss. Those nodes of the first and second resistor strings 11 and 12 which are the same in potential level are connected by means of wiring layers 14, 17 and 20. Therefore, the first and second resistor strings 11 and 12 are symmetrical to each other, and the non-linear error arising from the manufacturing errors of the resistor elements is prevented from increasing from the ground potential points Vss to the reference potential points Vss.
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