8

Multilayer Model (MLM) Library

This core library lets you model up

to 40 metal layers and 80 coupled

lines. It offers an alternative trade off

in simulation speed versus accuracy

compared with the Momentum

Planar EM simulator. The models

run faster than Momentum, but

Momentum takes post-layout

routing into account. The effects

of impedance, loss, crosstalk, and

delay are modeled with the 2-D

cross-sectional electromagnetic field

solver that underlies this library. Thus

it is particularly suited to pre-layout

channel modeling.

The models include advance

conductor surface roughness

modeling, as well as a frequency-

dependent dielectric loss.

MLM library has advantages over

microstrip and stripline models,

including a greater number of

available coupled-line models, and the

ability to place traces on any specific

layer.

0

-20

-40

-60

0

4

8

12

16

20

Frequency (GHz)

Figure 7. Broadband SPICE model overlays exactly with original S-parameters for a

RambusTM device

Figure 8. Multilayer interconnect models