Active solid-state devices (e.g. – transistors – solid-state diode – Integrated circuit structure with electrically isolated... – Passive components in ics
Reexamination Certificate
2000-09-25
2002-01-29
Picardat, Kevin M. (Department: 2822)
Active solid-state devices (e.g., transistors, solid-state diode
Integrated circuit structure with electrically isolated...
Passive components in ics
C257S924000, C438S108000, C438S393000, C438S396000
Reexamination Certificate
active
06342724
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to semiconductor chip or die assemblies and, more particularly, to such assemblies wherein a thin-film coupon-type decoupling capacitor is positioned adjacent to the backside of a die. The invention also encompasses methodology for constructing such assemblies.
2. State of the Art
Traditionally, a widely employed chip assembly (sometimes called a die assembly or a semiconductor device assembly) has comprised a die that is attached to a lead frame. The lead frame provides physical support for the die and is used to connect the die with external circuitry. Generally, lead frames are fabricated from a strip of sheet metal by stamping or chemical milling (etching) and are made from various materials depending on cost, fabrication, and functional requirements. The lead frame may have from four to over one hundred leads or pins. After connecting wires are bonded between the die and leads, the die, wires, and inner ends of the lead frame leads are encapsulated with a plastic encapsulant or located in a preformed cavity-type carrier (generally ceramic, or metal if mil-spec packaging standards apply) to complete the chip assembly.
The various leads of the lead frame (or chip assembly) provide paths for different electrical signals. For example, some lead fingers may conduct data signals between the chip assembly and other chip assemblies. Other lead fingers may conduct address signals used to address memory locations in the chip assembly or another chip assembly. Other lead fingers conduct control signals. Still other lead fingers provide paths for power or ground signals. In some chip assemblies, more than one lead finger provides power or ground. In the case of some chip assemblies, multiple lead fingers carrying power signals may be electrically isolated from each other so that the power signals may have different voltage, current, and/or frequency characteristics to satisfy the requirements of different power groups on the same chip. Likewise, multiple lead fingers carrying ground signals may be electrically isolated from each other. Power signals are sometimes referred to as Vcc (or by a similar nomenclature, such as Vccx, Vccq, Vccl, Vcc2). Ground signals are sometimes referred to as Vss (or by a similar nomenclature, such as Vssx, Vssq, Vss1, Vss2).
With each passing year, newly developed dice provide ever-increasing levels of performance in capacity and speed with little increase, or sometimes even a decrease, in size of the overall die. Indeed, progress in that regard has been astounding. In some instances, the increase in capacity occurs as a result of an increase in density or the number of transistors per units area of material. The increase in speed may be facilitated by an increase in clock frequency or smaller rise times.
Increases in capacity and speed are not achieved without attendant disadvantages. For example, a substantial amount of noise may be created by the switching of huge numbers of transistors. The noise is experienced particularly on the power bus (sometimes referred to as Vcc). One solution is to provide a decoupling capacitor between Vcc and ground (sometimes referred to as Vss). The decoupling capacitor(s) provides a path to ground for high frequency signals, thereby removing them from the power bus.
An on-chip decoupling capacitor may be formed by using a MOSFET (metal oxide semiconductor field effect transistor). The more the capacitance needed, the more silicon (or GaAs) space will be consumed. However, there is usually little, if any, excess silicon space on a state-of-the-art die to implement such an approach. Accordingly, decoupling capacitors have generally been placed off the die.
For example, in U.S. Pat. No. 4,680,613 to Daniels et al. (the “'613 patent”), a decoupling capacitor 50 is connected between a power lead finger tab 21 and a ground plate 40, in the package but off the die 14. The power lead finger 22 is formed with an opening or cutout opening 55 with a power lead finger tab 21 adjacent to the opening. (Col. 7, line 66 through col. 8, line 20). The lead frame 20 is formed with a central opening without a die attach paddle or paddle supports and a dielectric layer 30 is also formed with a central opening in alignment with the central opening of the lead frame 20, forming a cavity 16 so that a chip or die 14 may be bonded directly to the ground plate 40 which forms a die attach plate. (Col. 7, lines 62-68).
Col. 1 of the '613 patent discusses problems with inductive impedance created by long parallel lines or runs of adjacent conductive strips or traces formed by the lead frame fingers. The '613 patent further states that in order to accomplish the various objectives of that invention, the invention provides an improved low inductive impedance dual in-line package for an integrated circuit die incorporating an elongate lead frame formed with a central opening but without a die-attach paddle in the central opening and without paddle supports. A ground plate forms the die-attach plane, parallel with and spaced from the lead frame. (Col. 3, lines 17-25). The '613 patent also states the decoupling capacitor is contained within the package itself, closer to the chip, thereby minimizing the series inductance of leads across which undesired voltages are generated. (Col. 5, lines 7-11).
U.S. Pat. No. 4,994,936 to Hernandez (the “'936 patent”) describes a decoupling capacitor that is attached directly to an IC lead frame and thereafter encapsulated within a molded package along with an IC chip, resulting in a decoupling scheme which is internal to the molded IC package. The '936 patent also notes advantages in noise decoupling with low inductance and describes a chip package in which a large, thin decoupling capacitor 34 is attached to the bottom surface of a die support platform 22. The decoupling capacitor 34 comprises a dielectric 36 between conductors 38 and 40.
As semiconductor technology progresses, the trend is to employ unpackaged, or “bare,” dice secured directly to a carrier substrate, omitting the lead frame and packaging formerly employed. In such so-called “chip-on-board” (COB) configurations comprising multi-chip modules (MCMs), the dice are connected to terminal pads of conductors on the substrate, as by wire bonding, flip-chip bonding or use of a flex circuit dielectric carrying foil-type conductors. Nonetheless, the need for decoupling capacitors continues and must be accommodated.
Referring to
FIG. 1
herein, an exemplary prior art MCM
10
includes a die
14
and a die
16
connected to a substrate
20
. Dice
14
and
16
may be packaged or unpackaged. Chip capacitors
22
A and
22
B provide decoupling capacitance for die
14
, and may serve different power groups on die
14
if required. Chip capacitors
26
A and
26
B likewise provide decoupling capacitance for die
16
. Another prior art assembly is depicted in
FIG. 2
herein, wherein a die
30
is connected to a substrate
32
and is connected to external circuitry through wire bonds
34
. Die
30
may be encapsulated with an optional glob top
40
. A remote chip capacitor
42
provides decoupling capacitance.
Chip capacitors are effective in providing decoupling capacitance, but take up valuable surface area or “real estate” on the printed circuit board or other carrier substrate carrying the dice and decoupling capacitors, particularly in an MCM configuration.
One approach to reducing the substrate real estate is disclosed in U.S. Pat. No. 4,879,631, assigned to the assignee of the present invention. The '631 patent discloses the use of packaged, surface-mount dice superimposed over surface-mount capacitors in a single in-line memory module (SIMM) configuration. This configuration is not, however, suitable for current state-of-the-art MCMs employing unpackaged, or “bare,” dice. Such modules include SIMM as well as dual in-line memory module (DIMM) configurations, as well as other modules employing dice having functions other than memory.
Several decoupling c
Akram Salman
Wark James M.
Micro)n Technology, Inc.
Picardat Kevin M.
TraskBritt
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