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Technique to Feed High Dc Power With Minimum Dc Drop Variation

IP.com Disclosure Number: IPCOM000041476D
Original Publication Date: 1984-Feb-01
Included in the Prior Art Database: 2005-Feb-02
Document File: 2 page(s) / 36K

Publishing Venue

IBM

Related People

Feinberg, I: AUTHOR [+2]

Abstract

Resistors are used for powering chips having small circuit counts in high power modules populated with other high circuit count chips so that voltage drops are equalized between the chips and noise margin and driver output level are improved. Voltages at chip terminals normally vary due to distribution drops, the logic states of the chips, and the number of circuits per chip. The addition of the resistors to the small circuit count chips causes them to draw more current and, hence, equalize the chip voltages relative to the high circuit count chips in the same module. The first two voltage levels shown in the figure represent voltage drops across two differently populated chips in the same module. The variation (WV) of the voltage level from chip to chip is detrimental to noise margin and driver output level.

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Technique to Feed High Dc Power With Minimum Dc Drop Variation

Resistors are used for powering chips having small circuit counts in high power modules populated with other high circuit count chips so that voltage drops are equalized between the chips and noise margin and driver output level are improved. Voltages at chip terminals normally vary due to distribution drops, the logic states of the chips, and the number of circuits per chip. The addition of the resistors to the small circuit count chips causes them to draw more current and, hence, equalize the chip voltages relative to the high circuit count chips in the same module. The first two voltage levels shown in the figure represent voltage drops across two differently populated chips in the same module. The variation (WV) of the voltage level from chip to chip is detrimental to noise margin and driver output level. The WV variation is reduced by bringing the power of the lightly populated chip closer to that of the highly populated chip by powering the small circuit count chips through added resistors.

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