cumulativeMetalAntenna

Specifies the maximum antenna ratios for one or more antenna models (oxide thicknesses) for area values accumulated through all the poly and metal layers attached to a gate. This constraint holds a value that specifies the maximum allowed ratio of this cumulative sum to the gate area and specifies how that maximum ratio changes if a diode is present on the wire.

cumulativeMetalAntenna Quick Reference

Constraint Type	Simple
Value Types	AntennaRatioValueArray, AntennaRatioValue
Database Types	Technology
Scope	design, foundry
Category	Antenna

Value Types

AntennaRatioValue	Specifies the default antenna model.
AntennaRatioValueArray
	Specifies more than one antenna model.

Parameters

• antennaAreaFactor (FltValue) specifies a factor, between 0 and 1, for calculating the antenna area. The default value is 1.
• antennaCumRoutingPlusCut (BoolValue) indicates whether the cumulative antenna ratio of the layer immediately below or the like layer immediately below for a layer’s cumulative antenna calculation is included.
• antennaDiffAreaReduceFactor (Flt1DTblValue) multiplies the conductor area by a floating point factor that depends on the diffusion area attached to the net. If the antennaDiffMinusFactor is non-zero, the subtraction of the diffusion area times the antennaDiffMinusFactor must occur after the metal and cut areas are multiplied by the antennaDiffAreaReduceFactor.
• antennaDiffPlusFactor (FltValue) determines how the diffusion area connected to the net is added to the area of the gate for antenna/gate ratio calculations. The default value is 0.0.
• antennaDiffMinusFactor (FltValue) determines how the diffusion area connected to the net is subtracted from the antenna area when calculating antenna/gate ratio for both metal and cut layers.

Related Topics

Antenna Constraints

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