demo_res

            

1.    Symbol:

 

2.    Demo kit Resistors:

 

a)       Parameters:

 

Name

Description

Unit

Default

Type

Two types of resistors are available. One for Mesa and the other for NiCr. Details are given below.

nil

res1

Resistance(R)

Valid resistance range

Ohm

100

Width(w)

The width to be fixed, depending on current carrying requirements.

um

20

Length(l)

Length is automatically calculated for a given Resistance and width. Non editable.

um

8

Sheet Resistance(Rsh)

Sheet resistance of the material (MESA or NiCr) for information. Non editable.

Ohm/square

250

 

b)      Range:      

                  Type1 (res1); MESA resistor; R= (25 to 10000 Ohm); w= (5 to 50 um)

                  Type2 (res2); NiCr resistor; R= (5 to 2000 Ohm); w= (5 to 50 um)

 

 

3.    Equivalent Circuit:   

          

 

4.    Notes:

a)       From EM simulated data, equivalent circuit parasitic values are estimated. The scaling of parasitic element values is done for the valid range of no of turns. Then each parasitic element is curve fitted (typically to 5th order) and then model is net listed

b)      To get higher values of resistances choose smaller values of widths. To get smaller values of resistances choose higher values of widths.

c)       All the resistors are connected using M0 metal layer. Choose proper via to connect another elements.

d)      Available both in schematic and layout with synchronization.

 

5.    EM simulation and Electrical simulation comparison:

 

There can be subtle difference between EM data and the schematic due to mathematical limitations of model.

 

Type = res2; Resistance, R = 100 Ohm; Width, w = 20 um; Calculated length, l = 40 um; Rsh= 50 Ohm/square

 

 

6.   Cross-section Views:

                                                   

 

 

The cross section view given above is not to scale. Other top layers are not shown.