Metal fusion bonding – Process – Plural joints
Patent
1998-04-06
1999-12-07
Tran, Andrew Q.
Metal fusion bonding
Process
Plural joints
361763, 361743, 361782, 361811, 365 51, 365 63, 365226, B23K 3102
Patent
active
05996880&
ABSTRACT:
A memory module has DRAM chips mounted on both a front and a back surface but decoupling capacitors mounted on only the front surface. Each decoupling capacitor is for suppressing current spikes from a pair of DRAM chips. The pair of DRAM chips includes a first DRAM chip on the same surface as the capacitor and a second DRAM chip opposite the first DRAM chip on the back surface of the module. The first DRAM chip belongs to a first bank while the second DRAM chip belongs to a second bank. Two RAS signals are for controlling access to the two banks. Since only one bank is accessed at any time, and access causes current spikes, only one bank and only one DRAM chip in the pair of DRAM chips creates a current spike at any time. Thus a capacitor can be shared between the two DRAM chips in the pair. The shared capacitor can be mounted next to or under one of the DRAM chips, or formed within the multi-layer substrate itself. Having capacitors on only one of the surfaces reduces the number of placement sequences required, reducing manufacturing cost.
REFERENCES:
patent: 5636099 (1997-06-01), Sugawara et al.
patent: 5829667 (1998-11-01), Martin et al.
patent: 5841686 (1998-11-01), Chu et al.
Chu Tzu-Yih
Ma Abraham C.
Auvinen Stuart T.
MA Laboratories, Inc.
Tran Andrew Q.
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