demo_cap

1. Symbol:

2. Demo kit Capacitors:

a) Parameters:

Name	Description	Unit	Default
Type	type of capacitor (cap1 or cap2)	nil	cap2
Capacitance(C)	Capacitance value, within valid range (see below)	pF	0.168
Width(w)	Calculated width of the square capacitor (not editable)	um	75

b) Range:

Type1 (cap1); Between M0 and M1; (0.07338 to 59.05pF)

Type2 (cap2); Between M0 and M2; (0.014 to 2.31 pF)

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 sizes. Then each parasitic element is curve fitted (typically to 5^th order) and then model is net listed.

b) For simplicity, only square capacitors are modeled. However, one can still make rectangular capacitors by properly cascading them. The transmission line effects should be kept in mind for larger aspect ratios.

c) The capacitors of type “cap1” have M0 and M1 connections and type “cap2” have M0 and M2 connections. Appropriate transmission lines should be used while connecting capacitors. Never use a via immediately after a capacitor. It is recommended to use some length of transmission line before connecting to a via.

5. Model accuracies:

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

Example: Type = “cap1”; Capacitance, C = 10 pF; Calculated Width, w = 121.9 um

6. Cross-section Views:

The cross section views given above are not to scale.