AN2586 Freescale Semiconductor / Motorola, AN2586 Datasheet - Page 3

• Manufacturer Part Number: AN2586
• Description: MPC8260 PowerQUICC II Family Power Distribution Trends
• Manufacturer: Freescale Semiconductor / Motorola

Also from the perspective of the power delivery network, answers to the following are not known:
This document addresses these topics. Figure 2 shows a scope capture of MPC8260 power input from a
non-optimized system.
In this case, the MPC8260 supply power dropped to below 1.9 V. The measurement was taken as close to
MPC8260 pin as possible. We can conclude that early planning is important for the distribution network as
well as bypass capacitor network.
3 Previous Work Study
Because the design challenge is a circuit optimization problem, we need to address it in a way that covers
most of the aspects mentioned in Section 2, “Statement of the Problem.” We want to study the following:
MOTOROLA
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Bypass capacitors connection to load
What is the optimal topology of the supply and ground layers, given a set of physical constraints?
What is the nature of the interaction of this network with the load package?
How can we minimize the noise and EMI and at the same time meet the power demand
requirement?
How do we estimate the load?
How do we model the load?
How do we model the BCP delivery network?
How do we optimize the response with non ideal caps?
MPC8260 PowerQUICC II Family Power Distribution Trends: A Survey
Figure 2. MPC8260 Power Input from a Non-optimized Source
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
Previous Work Study
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