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XAPP946-适用于Virtex-4 RocketIO MGT的开关电源
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2012-02-10
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This document presents design techniques and reference circuits that power Virtex™-4 FXRocketIO™ multi-gigabit transceivers (MGTs) operating at data rates below 3.125 Gb/s.When using multiple transceivers, it is sometimes preferred to power them from a switchingpower supply. However, switching power supplies generate noise that affects transceiver
. This application note describes techniques that can be used to avoid powersupply-induced performance degradation on RocketIO links. It presents performance dataobtained with an ideal power supply, a low-noise switching regulator, and a noisy switchingregulator for 2.5 Gb/s and 3.125 Gb/s data rates.
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