Semiconductor device including a pair of shield lines

1. A device, comprising:

a first circuit including a voltage generating circuit generating a predetermined voltage, the first circuit producing the predetermined voltage at an output end thereof;

a second circuit having an input end;

a first wire connecting the output end of the first circuit with the input end of the second circuit; and

a pair of shield lines disposed so as to sandwich the first wire therebetween, one of the pair of shield lines being supplied with a power supply potential for driving at least one of the voltage generating circuit and the second circuit, another of the pair of shield lines being supplied with a ground potential for driving at least one of the voltage generating circuit and the second circuit.

2. The device as claimed in claim 1 , wherein the first circuit, the second circuit, the first wire, and the pair of shield lines are formed on the same semiconductor chip.

3. The device as claimed in claim 2 , wherein the first circuit further comprises a send circuit controlling the first circuit so that the output end of the first circuit has a voltage equal to the predetermined voltage,

the first circuit producing the predetermined voltage on the first wire via the send circuit.

4. The device as claimed in claim 3 , wherein the first wire is connected to the input end of the second circuit via a receive circuit,

the receive circuit being a circuit controlling the second circuit so that the input end of the second circuit has a voltage equal to the predetermined voltage of the first wire,

wherein the device further comprises wires for supplying the power supply potential and the ground potential to the receive circuit that are connected to pads which are connected to wires for supplying the power supply potential and the ground potential to the send circuit.

5. The device as claimed in claim 4 , wherein the first circuit comprises an internal voltage generating circuit as the voltage generating circuit, the predetermined voltage being a reference voltage generated by the internal voltage generating circuit.

6. The device as claimed in claim 5 , wherein the device comprises wires for supplying the power supply potential and the ground potential to the internal voltage generating circuit that are connected to pads different from pads connected to wires for supplying the power supply potential and the ground potential to other circuits on the semiconductor chip.

7. The device as claimed in claim 6 , wherein the power supply potential and the ground potential for fixing the pair of shield lines are supplied from the pads connected to the wires for supplying the power supply potential and the ground potential to the internal voltage generating circuit.

8. The device as claimed in claim 6 , wherein the wires for supplying the power supply potential and the ground potential to the send circuit and the receive circuit are connected to the pads which are connected to the wires supplying the power supply potential and the ground potential to the internal voltage generating circuit.

9. The device as claimed in claim 8 , wherein the power supply potential and the ground potential for fixing the pair of shield lines are supplied from the pads connected to the wires for supplying the power supply potential and the ground potential to the send circuit and the receive circuit.

10. The device as claimed in claim 9 , wherein the pair of shield lines configures a part of wires for supplying the power supply potential and the ground potential to the send circuit, the receive circuit, or the internal voltage generating circuit.

11. The device as claimed in claim 1 , wherein the second circuit comprises a load driving circuit driving a load circuit in response to the predetermined voltage on the first wire.

12. The device as claimed in claim 11 , wherein the load driving circuit comprises:

a first transistor having first and second main electrodes and a control electrode; and

a control circuit controlling a voltage between the second main electrode and the control electrode of the first transistor so that a voltage of the first main electrode of the first transistor becomes the predetermined voltage,

the load driving circuit supplying the voltage of the first main electrode of the first transistor to the load circuit.

13. The device as claimed in claim 1 , wherein the pair of shield lines comprises a plurality of sets.

14. A device, comprising:

a control portion including a voltage generating circuit and controlling a voltage of a first wire in accordance with a predetermined voltage;

a driving portion operating by the voltage of the first wire; and

a pair of shield lines disposed via a insulating film along the first wire, one of the pair of shield lines being fixed by a power supply potential which is supplied to at least one of the voltage generating circuit and the driving portion and another of the pair of shield lines being fixed by a ground potential which is supplied to at least one of the voltage generating circuit and the driving portion.

15. A device, comprising:

a first wire;

a control portion controlling a voltage of the first wire;

a driving portion operating by the voltage of the first wire; and

a pair of shield lines disposed so as to sandwich the first wire therebetween, one of the pair of shield lines being connected to a pad which is connected to a wire supplying a power supply potential to at least one of the control portion and the driving portion, another of the pair of shield lines being connected to another pad which is connected to another wire supplying a ground potential to at least one of the control portion and the driving portion.