Altera Power Delivery Network - Manual (Page 14)

1–10 Chapter 1: Power Delivery Network (PDN) Tool User Guide
Setting Up the PDN Tool
Power Delivery Network (PDN) Tool User Guide © March 2009 Altera Corporation
■ VRM Library
■ Spreading R, L Parasitics
■ Dielectric Material Library
You can change each of the default values listed in the respective sections to meet the
specific requirements of your design.
Two-Terminal Decoupling Capacitors
The decoupling capacitors section contains the default ESR and ESL values for the
various two-terminal capacitors in different footprints (0201, 0402, 0603, 0805, and
1206). You also can either modify the default values or enter your own custom values
in the Custom field. If you use a non-two-terminal capacitor, such as an IDC-type
capacitor, you must use the Custom field to enter the capacitor parasitics and the
corresponding mounting inductance.
The decoupling capacitors section also provides the option for the user-defined
capacitors (such as User1, ..., User4). You can define the ESR and ESL parasitics for the
various footprints and enter the corresponding capacitor value in the Decap Selection
tab. Choose the corresponding footprint when defining the capacitor values.
X2Y Decoupling Capacitors (High/Mid Frequency)
The decoupling capacitors section contains the default ESR and ESL values for the
various X2Y capacitors in different footprints (0603, 0805, 1206, and 1210). You also
can replace the default ESR and ESL values with your own custom values.
Bulk Capacitors
The bulk capacitors section contains the commonly used capacitor values for
decoupling the power supply at mid/low frequencies. You can change the default
values to reflect the parameters specific to the design.
BGA Via and Plane Capacitance
The BGA via and plane capacitance section provides an option to directly enter the
values for effective via loop inductance under the BGA and plane capacitance during
the pre-layout phase when no design-specific information is available.
If you have access to design-specific information, you can ignore this section and
enter the design-specific information in the Plane Cap and BGA Via tabs that
calculate the plane capacitance and the BGA via parasitics, respectively.
VRM Library
The VRM section lists the default values for both the linear and switcher regulators.
You can change the VRM parasitics listed under the linear/switcher rows or add the
custom parasitics for the VRM relevant to the design in the Custom field.