Chapter 37 Summary: Power Subsystem Design Example
In this chapter, the previously mentioned requirements for a total power supply tolerance of +/- 5% are applied to a card. The reader will find out how to determine how many capacitors are needed for a particular design, and which type of capacitor is needed – a decoupling cap or a lower-voltage cap. Examples include the design of subsystems for DDR-SDRAMs and microprocessors. Also covered are ways to determine how much plane capacitance is required to support fast edges on a PCB, and methods for increasing plane capacitance.
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