Device matching

Device matching. Once LVS (Layout Versus Schematic) has matched the connectivity, it pairs each device in the layout with its device in the schematic and checks that the two agree. A pair can fail in several ways, and a device can also be present on only one side:

• match - same type and same size on both sides.
• wrong size - the width or the length differs (a mis-drawn transistor).
• wrong type - one side is NMOS and the other PMOS.
• missing - the schematic has the device but the layout does not.
• extra - the layout has a device the schematic does not.

Read each row's schematic and extracted specification, click the row to set its verdict, and get every device right. A device can match on connectivity yet still differ in size or type, so check the type and both dimensions. Then Submit verdicts.