Dear all,

I have the following problem when I simulate Thin Film Resistors.

The Schematic, Momentum, and FEM simulators, all give a different result. In particular:

1- Schematic gives what I expect as correct results

2- Momentum simulation appears to model a lower than expected resistor value.

3- FEM results indicate that the Resistor just acts as metal.

Note that I've used the very same substrate definition for all simulations (Schematic, Momentum, FEM).

Please refer to the attached ADS 2013 Workspace for all details.

Anyone has got any idea how to solve the problem?

Regards,

Angelo

Edited by: apaglia on Oct 31, 2013 2:18 PM

I have the following problem when I simulate Thin Film Resistors.

The Schematic, Momentum, and FEM simulators, all give a different result. In particular:

1- Schematic gives what I expect as correct results

2- Momentum simulation appears to model a lower than expected resistor value.

3- FEM results indicate that the Resistor just acts as metal.

Note that I've used the very same substrate definition for all simulations (Schematic, Momentum, FEM).

Please refer to the attached ADS 2013 Workspace for all details.

Anyone has got any idea how to solve the problem?

Regards,

Angelo

Edited by: apaglia on Oct 31, 2013 2:18 PM

the solution to the problem was as follows:

- in the Material Definitions tab, modify the Parameter Type from Resistance (Ohm/Square) to Resistivity (Ohm.cm).

The Resistivity parameter probably better defines the 3D properties of a conductor.

In my case, to calculate the Resistivity value (Ohm.cm), starting from Resistance value (Ohm/Square), I acted as follows:

100 Ohm/Square, Area=530 x 1 um² (530um is my 50 Ohm line width) --> 1e-2 Ohm.cm

I've not tried to simulate using the Conductivity value (in my case 1e+4 S/m) instead of the Resistivity. Please let me know if you do, and get the same results as when you simulate using Resistivity.

Best regards,

Angelo