WO1989003634A1 - An arrangement for deactivating integrated circuits electrically - Google Patents

An arrangement for deactivating integrated circuits electrically Download PDF

Info

Publication number
WO1989003634A1
WO1989003634A1 PCT/SE1988/000493 SE8800493W WO8903634A1 WO 1989003634 A1 WO1989003634 A1 WO 1989003634A1 SE 8800493 W SE8800493 W SE 8800493W WO 8903634 A1 WO8903634 A1 WO 8903634A1
Authority
WO
WIPO (PCT)
Prior art keywords
deactivating
foil
circuit
capacitors
arrangement
Prior art date
Application number
PCT/SE1988/000493
Other languages
French (fr)
Inventor
Alf Friman
Original Assignee
Carmis Enterprises S.A.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Carmis Enterprises S.A. filed Critical Carmis Enterprises S.A.
Priority to BR888807736A priority Critical patent/BR8807736A/en
Publication of WO1989003634A1 publication Critical patent/WO1989003634A1/en
Priority to KR1019890701031A priority patent/KR890702419A/en
Priority to FI901524A priority patent/FI901524A0/en
Priority to BG091634A priority patent/BG51169A3/en
Priority to DK086990A priority patent/DK86990D0/en
Priority to NO901618A priority patent/NO901618D0/en

Links

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K3/00—Apparatus or processes for manufacturing printed circuits
    • H05K3/30—Assembling printed circuits with electric components, e.g. with resistor
    • H05K3/32—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L23/00—Details of semiconductor or other solid state devices
    • H01L23/58—Structural electrical arrangements for semiconductor devices not otherwise provided for, e.g. in combination with batteries
    • H01L23/585—Structural electrical arrangements for semiconductor devices not otherwise provided for, e.g. in combination with batteries comprising conductive layers or plates or strips or rods or rings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L23/00—Details of semiconductor or other solid state devices
    • H01L23/58—Structural electrical arrangements for semiconductor devices not otherwise provided for, e.g. in combination with batteries
    • H01L23/64—Impedance arrangements
    • H01L23/642—Capacitive arrangements
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K1/00—Printed circuits
    • H05K1/02—Details
    • H05K1/0213—Electrical arrangements not otherwise provided for
    • H05K1/0216—Reduction of cross-talk, noise or electromagnetic interference
    • H05K1/023—Reduction of cross-talk, noise or electromagnetic interference using auxiliary mounted passive components or auxiliary substances
    • H05K1/0231—Capacitors or dielectric substances
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/0001—Technical content checked by a classifier
    • H01L2924/0002—Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/30—Technical effects
    • H01L2924/301—Electrical effects
    • H01L2924/3011—Impedance
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
    • H05K2201/10—Details of components or other objects attached to or integrated in a printed circuit board
    • H05K2201/10431—Details of mounted components
    • H05K2201/10507—Involving several components
    • H05K2201/1053—Mounted components directly electrically connected to each other, i.e. not via the PCB
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
    • H05K2201/10—Details of components or other objects attached to or integrated in a printed circuit board
    • H05K2201/10613—Details of electrical connections of non-printed components, e.g. special leads
    • H05K2201/10621—Components characterised by their electrical contacts
    • H05K2201/10689—Leaded Integrated Circuit [IC] package, e.g. dual-in-line [DIL]

Definitions

  • the present invention relates to an arrangement for deac ⁇ tivating integrated circuits electrically with the aid of deactivating capacitors connected between earth/signal outputs and/or earth/supply lines.
  • EMI electromagnetic interference
  • an object of the present invention is to provide a simple, inexpensive and effective solution to the problem of deactivating; IC-circuits electrically.
  • This object is achieved in accordance with the invention by covering at least the major part of the under-surface or over-surface of such an IC-circuit with a metal foil which is connected to the earth connection of the circuit by means of a short conductor extending to the edge of the foil and with the signal outDuts and/or the supply conduc ⁇ tor of the circuit also connected to the edges of the foil, via the deactivating capacitors.
  • a deactivator of this kind can be easily constructed.
  • the metal foil may, advantageously, be glued to one side of the IC-circuit, level with the edge surfaces thereof, and to this end may be self-adhesive. Connection of the deactivating capaci ⁇ tors then becomes highly practicable and easy to carry out, particularly when one or more of these capacitors consist of chip capacitors soldered between on one hand respective signal outputs or the supply conductor and on the other hand adjacent points on the foil edge.
  • Deactivation of an integrated circuit in accordance with the invention fulfills all of the criteria upon which effective deactivation depends, such as the presence of short and broad supply conductors so as to obtain a low series inductance, supply-voltage and signal-voltage application surfaces of small dimensions (small areas, short lengths), smallest possible loop area, low capacitor losses and low impedance of the earthing surface.
  • the effect produced by the present invention can be confirmed in practice, suitably by carrying out comparison tests, as recited in the following description.
  • Figure 1 is a perspective view of an IC-circuit according to the invention
  • Figure 2 is a diagrammatic illustration of test apparatus
  • ' Figure 3 is a circuit diagram of the tested IC-circuit with connections
  • FIGS ⁇ , 5, 6 and 7 illustrate curves obtained in the tests.
  • an IC-circuit in the form of a conventional elongated capsule 1 which has a sheet of copper foil 2 firmly glued to the upper surface thereof.
  • the connecting legs of the capsule are arranged along the two long sides of the capsule, where ⁇ with the leg 3 is earthed and the leg is an output.
  • a voltage supply leg 5 is arranged on the hidden side of the capsule.
  • the earthed leg 3 is connected to the edge of the foil 2 by means of a very short firmly soldered conductor 6, and the output leg 4 is connected to the edge of said foil through a firmly welded clip capacitor 7.
  • the voltage supply leg 5 is connected to the edge of the foil through a further chip capacitor 8.
  • an IC-capsule 1 is located in a screened room 10.
  • the capsule 1 is connec ⁇ ted to a signal generator 11.
  • a biconcave-antenna 12 which is connected to an antenna amplifier 13, a spectrum analyser 14 and a printer 15.
  • the IC-circuit 1 illustrated in Figure 3 has marked there ⁇ on three points A-E, of which points A and E represent points on a circuit board adjacent the capsule 1 and the points B, C, D are points located directly on the capsule legs.
  • Chip capacitor 100 nF between BoD max EMI-level 13 dB Chip capacitor 47 nF between C£D. -

Landscapes

  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • Power Engineering (AREA)
  • Electromagnetism (AREA)
  • Manufacturing & Machinery (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
  • Structures For Mounting Electric Components On Printed Circuit Boards (AREA)
  • Lead Frames For Integrated Circuits (AREA)

Abstract

The invention relates to an arrangement for electrically deactivating IC-circuits by means of deactivating capacitors. A particularly simple and effective electrical deactivation of such circuits is achieved in accordance with the invention by mounting, e.g. gluing, a metal foil (2) on the circuit. The earth connection (3) of the circuit is connected to the edge of the foil through a short conductor and each of the signal output (4) and supply conductor (5) is connected directly to the foil edge through a respective soldered chip capacitor (7, 8).

Description

An arranεement for deactivating integrated circuits electrically,
The present invention relates to an arrangement for deac¬ tivating integrated circuits electrically with the aid of deactivating capacitors connected between earth/signal outputs and/or earth/supply lines.
Troublesome interference occurs when a large number of fast acting integrated circuits, so-called IC-circuits, are connected together to a unit, e.g. a computer or data processor. For example, functioning of the equipment is on the one hand disturbed by surrounding influences, such as other computers, radio receivers, TV-apparatus and, on the other hand, the equipment itself has a disturbing in¬ fluence on such peripheral apparatus and equipment, there¬ by producing erroneous results or no result at all. The interference referred to here is an electromagnetic interference (EMI), which may be radiating or conductor- bound.
In addition to the problems which are manifested solely as interference, there is also a danger that the equipment will emit signals which can be captured at locations distansed from the equipment itself and utilized to obtain unauthorized or classified information, so-called reveal¬ ing signals.
All of these problems are well known in the art. Thus, the surroundings can be shielded from these signals, by metal- encapsulation of the equipment involved and by filtering the input and output signals. Such metal encapsulation becomes verv exDensive and difficult to effect, however, when the equipment concerned includes displays, visυal diSDlay screens, keyboards, etc.. Furthermore, encaosυla- tion does not assist against interference internally of the equipment. In order to safeguard against internal interference, it is standard practice to include a capaci¬ tor between the supply voltage and earth on a circuit board or card in the case of IC-circuits.
This solution is also encumbered with a number of draw¬ backs, however. For example, the solution is not particu¬ larly effective and does not assist against signals of a revealing nature or EMI. Furthermore, the devices required herefor require too much space in compact equipment.
Other solutions, exhaustively described in the literature, include the use of ferrite filters, ferrite plates, multi- layer circuit board and flat capacitors for fitting above or beneath IC-circuits. A further possibility is that of mounting one or more capacitors in a dense array above an IC-circuit. This solution is also inefficient, however.
None of the known solutions is sufficiently effective or simple enough for efficient application, particularly not to existing equipment.
Consequently, an object of the present invention is to provide a simple, inexpensive and effective solution to the problem of deactivating; IC-circuits electrically.
This object is achieved in accordance with the invention by covering at least the major part of the under-surface or over-surface of such an IC-circuit with a metal foil which is connected to the earth connection of the circuit by means of a short conductor extending to the edge of the foil and with the signal outDuts and/or the supply conduc¬ tor of the circuit also connected to the edges of the foil, via the deactivating capacitors. A deactivator of this kind can be easily constructed. The metal foil may, advantageously, be glued to one side of the IC-circuit, level with the edge surfaces thereof, and to this end may be self-adhesive. Connection of the deactivating capaci¬ tors then becomes highly practicable and easy to carry out, particularly when one or more of these capacitors consist of chip capacitors soldered between on one hand respective signal outputs or the supply conductor and on the other hand adjacent points on the foil edge.
Deactivation of an integrated circuit in accordance with the invention fulfills all of the criteria upon which effective deactivation depends, such as the presence of short and broad supply conductors so as to obtain a low series inductance, supply-voltage and signal-voltage application surfaces of small dimensions (small areas, short lengths), smallest possible loop area, low capacitor losses and low impedance of the earthing surface. The effect produced by the present invention can be confirmed in practice, suitably by carrying out comparison tests, as recited in the following description.
The invention will now be described in more detail with reference to the accompanying drawing, which illustrates schematically an exemplifying embodiment of the inventive arrangement and test apparatus with associated result curves. More specifically:
Figure 1 is a perspective view of an IC-circuit according to the invention; Figure 2 is a diagrammatic illustration of test apparatus;' Figure 3 is a circuit diagram of the tested IC-circuit with connections; and
Figures ^, 5, 6 and 7 illustrate curves obtained in the tests. In the embodiment illustrated in Figure 1, an IC-circuit in the form of a conventional elongated capsule 1 which has a sheet of copper foil 2 firmly glued to the upper surface thereof. The connecting legs of the capsule are arranged along the two long sides of the capsule, where¬ with the leg 3 is earthed and the leg is an output. A voltage supply leg 5 is arranged on the hidden side of the capsule. The earthed leg 3 is connected to the edge of the foil 2 by means of a very short firmly soldered conductor 6, and the output leg 4 is connected to the edge of said foil through a firmly welded clip capacitor 7. The voltage supply leg 5 is connected to the edge of the foil through a further chip capacitor 8.
In the diagrammatic Figure 2 illustration an IC-capsule 1 is located in a screened room 10. The capsule 1 is connec¬ ted to a signal generator 11. Also located in the screened room is a biconcave-antenna 12, which is connected to an antenna amplifier 13, a spectrum analyser 14 and a printer 15.
The IC-circuit 1 illustrated in Figure 3 has marked there¬ on three points A-E, of which points A and E represent points on a circuit board adjacent the capsule 1 and the points B, C, D are points located directly on the capsule legs.
The following measurements were made with a capacitor of 150 nF coupled between A and E.
1. No additional measures taken, corresponding to the normal situation in a computer e.g. max EMI-level 56 dB (Figure 4) 2. 100 nF + 4, 7 nF between Bo_D: max EMI-level 34 dB
47 nF + 4, 7 nF between C£ (Figure 5).
3. As 2+ferrite plate max EMI-level 28 dB (Figure 6)
4. Chip capacitor 100 nF between BoD max EMI-level 13 dB Chip capacitor 47 nF between C£D. -
and copper foil mounted in accordance with the description (Figure 7).
As will be seen from Figures 4-6 and Figure 7, there is a considerable difference between the conventional arrange¬ ments according to 1-3 above and the inventive arrangement represented by 4.

Claims

1. An arrangement for electrically deactivating integrated circuits (1) by means of deactivating capacitors located between earth/signal outputs and/or earth/supply conduc¬ tors,, characterized in that at least the major part of the upper surface or the bottom surface of such an integrated circuit (1) is covered with metal foil (2) which is con¬ nected to the earth connection (3) of the circuit by means of a short conductor (6) to the edge of the foil (2) , and to the circuit signal outputs (4) and/or supply conductor (5) via the deactivating capacitors (7, 8) which are also connected to the foil edges.
2. An arrangement according to Claim 1, characterized in that one or more of the deactivating capacitors is/are chip capacitors (7, 8) soldered between on the one hand respective signal outputs (4) or supply conductor (5) and on the other hand adjacent points on the foil edge.
3. An arrangement according to Claim 1 or 2, characterized in that the metal foil (2) is glued to one side of the integrated circuit (1) flush with the edges of said side.
PCT/SE1988/000493 1987-10-09 1988-09-23 An arrangement for deactivating integrated circuits electrically WO1989003634A1 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
BR888807736A BR8807736A (en) 1987-10-09 1988-09-23 AN ARRANGEMENT TO DEACTIVATE ELECTRICALLY INTEGRATED CIRCUITS
KR1019890701031A KR890702419A (en) 1987-10-09 1989-06-08 Electrically inert arrangement of integrated circuits
FI901524A FI901524A0 (en) 1987-10-09 1990-03-27 ANORDNING FOER ELEKTRISK AVKOPPLING AV INTEGRERADE KRETSAR.
BG091634A BG51169A3 (en) 1987-10-09 1990-04-02 Device for deactivation of integrated circuits electrically
DK086990A DK86990D0 (en) 1987-10-09 1990-04-06 DEVICE FOR ELECTRIC DISCONNECTION OF INTEGRATED CIRCUITS
NO901618A NO901618D0 (en) 1987-10-09 1990-04-09 DEVICE FOR ELECTRICAL DISCONNECTION OF INTEGRATED CIRCUITS.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8703913-7 1987-10-09
SE8703913A SE458004C (en) 1987-10-09 1987-10-09 DEVICE FOR ELECTRIC RELAXATION OF INTEGRATED CIRCUITS

Publications (1)

Publication Number Publication Date
WO1989003634A1 true WO1989003634A1 (en) 1989-04-20

Family

ID=20369821

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1988/000493 WO1989003634A1 (en) 1987-10-09 1988-09-23 An arrangement for deactivating integrated circuits electrically

Country Status (14)

Country Link
US (1) US4920444A (en)
EP (1) EP0391926A1 (en)
JP (1) JPH03500593A (en)
KR (1) KR890702419A (en)
CN (1) CN1013463B (en)
AU (1) AU610283B2 (en)
BG (1) BG51169A3 (en)
BR (1) BR8807736A (en)
DK (1) DK86990D0 (en)
ES (1) ES2009117A6 (en)
FI (1) FI901524A0 (en)
HU (1) HUT54265A (en)
SE (1) SE458004C (en)
WO (1) WO1989003634A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5557504A (en) * 1993-08-31 1996-09-17 Sgs-Thomson Microelectronics, Inc. Surface mountable integrated circuit package with detachable module
US5570273A (en) * 1993-08-31 1996-10-29 Sgs-Thomson Microelectronics, Inc. Surface mountable integrated circuit package with low-profile detachable module
US6274224B1 (en) 1999-02-01 2001-08-14 3M Innovative Properties Company Passive electrical article, circuit articles thereof, and circuit articles comprising a passive electrical article
US6577492B2 (en) 2001-07-10 2003-06-10 3M Innovative Properties Company Capacitor having epoxy dielectric layer cured with aminophenylfluorenes

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4497105A (en) * 1982-08-20 1985-02-05 Matsuo Electric Company, Ltd. Method of manufacturing solid electrolyte chip capacitors
GB2152753A (en) * 1983-11-30 1985-08-07 Nippon Mektron Kk Decoupling capacitor for integrated circuits and relationship with a printed circuit board
US4598307A (en) * 1982-09-22 1986-07-01 Fujitsu Limited Integrated circuit device having package with bypass capacitor
US4636918A (en) * 1982-07-30 1987-01-13 Rogers Corporation Decoupled integrated circuit package

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3614546A (en) * 1970-01-07 1971-10-19 Rca Corp Shielded semiconductor device
US4177480A (en) * 1975-10-02 1979-12-04 Licentia Patent-Verwaltungs-G.M.B.H. Integrated circuit arrangement with means for avoiding undesirable capacitive coupling between leads
US4626958A (en) * 1985-01-22 1986-12-02 Rogers Corporation Decoupling capacitor for Pin Grid Array package

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4636918A (en) * 1982-07-30 1987-01-13 Rogers Corporation Decoupled integrated circuit package
US4497105A (en) * 1982-08-20 1985-02-05 Matsuo Electric Company, Ltd. Method of manufacturing solid electrolyte chip capacitors
US4598307A (en) * 1982-09-22 1986-07-01 Fujitsu Limited Integrated circuit device having package with bypass capacitor
GB2152753A (en) * 1983-11-30 1985-08-07 Nippon Mektron Kk Decoupling capacitor for integrated circuits and relationship with a printed circuit board

Also Published As

Publication number Publication date
FI901524A0 (en) 1990-03-27
DK86990A (en) 1990-04-06
US4920444A (en) 1990-04-24
KR890702419A (en) 1989-12-23
CN1032470A (en) 1989-04-19
BG51169A3 (en) 1993-02-15
JPH03500593A (en) 1991-02-07
EP0391926A1 (en) 1990-10-17
AU610283B2 (en) 1991-05-16
SE8703913D0 (en) 1987-10-09
SE458004B (en) 1989-02-13
BR8807736A (en) 1990-08-07
SE458004C (en) 1991-10-07
HUT54265A (en) 1991-01-28
HU886251D0 (en) 1990-11-28
SE8703913A (en) 1989-02-23
CN1013463B (en) 1991-08-07
DK86990D0 (en) 1990-04-06
AU2556488A (en) 1989-05-02
ES2009117A6 (en) 1989-08-16

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