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WO2003030382A1 - Circuiterie, module de commutation comprenant cette circuiterie et utilisation de ce module de commutation - Google Patents

Circuiterie, module de commutation comprenant cette circuiterie et utilisation de ce module de commutation Download PDF

Info

Publication number
WO2003030382A1
WO2003030382A1 PCT/DE2002/003662 DE0203662W WO03030382A1 WO 2003030382 A1 WO2003030382 A1 WO 2003030382A1 DE 0203662 W DE0203662 W DE 0203662W WO 03030382 A1 WO03030382 A1 WO 03030382A1
Authority
WO
WIPO (PCT)
Prior art keywords
circuit arrangement
arrangement according
protective device
series
circuit
Prior art date
Application number
PCT/DE2002/003662
Other languages
German (de)
English (en)
Inventor
Christian Block
Holger FLÜHR
Kurt Wiesbauer
Johann Riedler
Heinz Ragossnig
Heinz Florian
Günther GREIER
Original Assignee
Epcos Ag
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
Priority claimed from DE2002101435 external-priority patent/DE10201435B4/de
Application filed by Epcos Ag filed Critical Epcos Ag
Priority to US10/490,914 priority Critical patent/US7492565B2/en
Priority to JP2003533455A priority patent/JP4008881B2/ja
Publication of WO2003030382A1 publication Critical patent/WO2003030382A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/40—Circuits
    • H04B1/44—Transmit/receive switching
    • H04B1/48—Transmit/receive switching in circuits for connecting transmitter and receiver to a common transmission path, e.g. by energy of transmitter

Definitions

  • the invention relates to a circuit arrangement which has an antenna input, a signal input and a signal output.
  • the circuit arrangement has a switching unit which optionally connects the antenna input to the signal input or the signal output.
  • Circuit arrangements of the type mentioned are often used as multiband front-end modules for mobile telephones.
  • they are connected to the antenna of the mobile phone at the antenna input. Touching the antenna by an electrically charged user can lead to electrostatic discharge, as they are also known under the name "Electrostatic Discharge ESD".
  • ESD Electrostatic Discharge
  • These electrostatic discharges can generate voltage peaks that are suitable for destroying the circuit arrangement. Accordingly, it is necessary to equip circuit arrangements of the type mentioned at the outset with a protective device against ESD.
  • circuit arrangements of the type mentioned which are equipped with a protective device against ESD.
  • the protection device is formed by an electrical high-pass filter, in which a capacitance is connected in series and an inductance is connected in parallel to the antenna input path.
  • the known circuit arrangement has the disadvantage that only the ESD pulse coupled directly into the circuit arrangement via the antenna can be reduced with the aid of the ESD protection device.
  • an electrostatic discharge can also generate a high voltage on the circuit arrangement via ground coupling. This can happen, for example, that the control input usually used in a switch is either at a high potential (high) or at a low potential (low).
  • the high potential is defined in that it is, for example, 2.3 V above the ground potential of the circuit arrangement.
  • an electrostatic discharge can also have a direct effect on the ground potential of the circuit arrangement in the case of a circuit arrangement mentioned at the beginning.
  • the voltage pulse resulting from an electrostatic discharge can have an effect on the circuit arrangement in addition to the path via the antenna and also via the control line.
  • the known circuit arrangement is not protected against these effects.
  • the high-pass filter used in the known circuit arrangement has the property of being a very simply constructed filter which allows all frequency components of a signal to pass almost unhindered from a certain cut-off frequency.
  • a very narrow frequency range is decisive for the further processing of the signals captured by the antenna in a mobile phone.
  • frequencies between approximately 1 and 2 GHz are used in mobile telephones according to the GSM, PCN or PCS standard. All other frequencies captured by the antenna are rather annoying and must therefore be filtered out.
  • at least one bandpass filter is necessary in order to make the signals collected by the circuit arrangement mentioned above processable for a mobile phone.
  • the high-pass filter arranged in the known circuit arrangement can only cut off frequencies below a cut-off frequency. It must therefore be followed by at least one filter circuit in order to the to cut out the frequency range of interest for the mobile phone from the signals picked up by the antenna.
  • the known circuit arrangement has the disadvantage that the high-pass filter circuit used to protect against ESD has an insertion loss, due to which the useful signals also experience a certain amount of attenuation, but the transmitted frequency band is not yet clipped. Accordingly, the known circuit arrangement has the disadvantage of an overall high insertion loss.
  • the aim of the present invention is therefore to provide a circuit arrangement of the type mentioned at the outset in which the frequency dependence of the protective device at the antenna input is improved.
  • a circuit arrangement which contains a switching unit with an antenna input, a signal input and a signal output.
  • the switching unit is suitable for connecting the antenna input to the signal input or the signal output in an electrically conductive manner.
  • a control line can be arranged on the switching unit, which controls the switch position of the switching unit.
  • the antenna input is connected to a first protective device against electrostatic discharge.
  • the first protective device against electrostatic discharges is designed in the form of a bandpass filter in a T configuration.
  • a bandpass filter has the advantage that it has a high insertion loss below a first cut-off frequency and above a second cut-off frequency. As a result, in particular low frequencies, in which the major part of the electrical power of the pulses generated by electrostatic discharges are contained, can be effectively suppressed.
  • By arranging a bandpass filter at the antenna input at least the requirement for subsequent filters in the reception paths can be relaxed, which leads to an overall better insertion loss.
  • the first protective device has an antenna input and a switch output. Antenna input and switch output are connected to each other by a cable. A first series connection of an inductance with a capacitance is connected in series to a second series connection of an inductance and a capacitance and in series with the line. Between these two series connections, a parallel connection of an inductor with a capacitance to a ground of the circuit arrangement is connected in parallel to the line.
  • a bandpass filter in a T configuration is implemented by the circuit arrangement of the protective device described.
  • the bandpass filter between 1 and 2 GHz has a low attenuation of less than 0.5 dB.
  • the bandpass filter should have the highest possible attenuation (e.g.> 20 dB at f> 3.4 GHz).
  • the circuit arrangement according to the invention with the bandpass filter also has the advantage that the two capacitors connected in series to the line result in a DC voltage block, which prevents that at the Switching unit can discharge existing DC voltages against the ground. This effectively reduces the risk of a short circuit.
  • control line is also connected to a second protective device against electrostatic discharges. This has the advantage that ESD interference entering the circuit can be effectively reduced by ground coupling via the control line.
  • the protective devices against electrostatic discharges are advantageously connected to a ground connection, into which the overvoltages of the electrostatic discharge can be dissipated.
  • the switching unit can be, for example, a voltage-controlled switch, as is usually used in mobile telephones due to its low power consumption.
  • a gallium arsenide switch is particularly suitable as the switching unit.
  • the switching unit can also have a plurality of signal inputs and outputs. Accordingly, several control lines are required.
  • the circuit arrangement can also be provided with a decoder, with the aid of which the number of control lines can be reduced.
  • a decoder usually requires a power supply that is connected via a supply line.
  • the ESD protection of such a circuit can be further improved by connecting the supply line to a third protective device against electrostatic discharge.
  • the decoder can also be constructed so that the voltages of the control lines from the voltage of the supply lines tion are generated. This is possible, for example, by means of so-called "pull-up resistors". Then the ESD protection can be simplified by providing only the voltage supply line with a second protection device. The protection of the control lines is then taken over by the protection of the power supply.
  • the circuit arrangement can also contain frequency filters which are assigned to individual signal inputs or signal outputs. They are particularly suitable for filtering the frequencies picked up by the antenna in a mobile phone so that the filtered signals passed through the signal output can be processed further by the mobile phone. The same applies to the signal inputs of the circuit arrangement that are used in a mobile phone to send voice signals generated in the mobile phone to a receiver via the antenna.
  • the second protective device against electrostatic discharge is, for example, the use of a voltage limiting element which is connected in parallel to the control line and which is connected to a ground potential.
  • a voltage limiting element can be a varistor, for example. From a certain limit voltage, such a varistor has a very low ohmic resistance, so that overvoltages can be diverted to ground.
  • varistors with a low switching voltage are suitable, since in this case the residual voltage occurring at a voltage pulse and stressing the circuit arrangement is the lowest. It is therefore possible to use varistors with a varistor voltage between 4 and 20 V. Accordingly, the terminal voltage loading the circuit arrangement in the case of a voltage pulse is approximately 8 to approximately 50 V. As a result, the circuit arrangement can be reliably protected against destruction in the event of an ESD pulse.
  • a switching spark gap or a Zener diode as a second protective device against electrostatic discharge.
  • the invention corresponds to a circuit arrangement in which the antenna input is connected to an antenna and in which the signal output is connected to a receiving amplifier of a mobile phone and the signal input is connected to a transmitting amplifier of a mobile phone.
  • a switching module which contains a circuit arrangement according to the invention.
  • the switching module also contains a multilayer ceramic substrate with integrated passive components that form electrical frequency filters. These frequency filters are assigned to the signal inputs and outputs.
  • the switching unit is arranged on the top of the multilayer ceramic substrate and can be implemented, for example, with the aid of PIN diodes or in the form of a gallium arsenide switch. Furthermore, the first and possibly second is in the switching module
  • the switching module has the advantage that due to the integration of the passive components in the ceramic substrate and the integration of the protective device into the switching module, a high level of integration is achieved, which has an advantageous effect on the space requirement of the switching module.
  • the integration of the first and possibly second protective device into the switching module can be achieved, for example, by building these components on the
  • the switching module is also advantageous to use the switching module as a front-end module in a mobile phone.
  • the invention is explained in more detail below on the basis of exemplary embodiments and the associated figures.
  • FIG. 1 shows an example of a circuit arrangement according to the invention in a basic circuit diagram.
  • FIG. 2 shows an example of a further circuit arrangement according to the invention in a basic circuit diagram.
  • FIG. 3 shows the use of the circuit arrangement according to the invention in a mobile telephone based on a basic circuit diagram.
  • FIG. 4 shows an example of a switching module according to the invention in a schematic longitudinal section.
  • FIG. 1 shows a circuit arrangement with a switching unit 4, which is provided with a ground 8.
  • the switching unit 4 has an antenna input 1, which is connected to an antenna 18.
  • the antenna input 1 is connected to a first protective device 6 against electrostatic discharge (symbolized by the lightning in FIG. 1).
  • the switching unit 4 contains at least one control line 5 which controls the switching process for connecting the antenna input 1 to the signal inputs 2 or the signal outputs 3 of the switching unit 4.
  • three control lines 5 are shown. At least one of these control lines 5 is provided with a second protective device 7 against electrostatic discharge.
  • This second protective device 7 is designed in the form of a varistor, which is connected to ground 8.
  • the switching unit 4 shown in FIG. 1 also has a decoder for which a supply line 11 is required. is such.
  • the supply line 11 is connected to a supply voltage + Vcc.
  • the supply line 11 is connected to a third protective device 12 against electrostatic discharge.
  • the third protective device 12 can be a varistor, for example, which is connected to the ground 8.
  • the first protection device 6 is designed in the form of a bandpass filter in a T configuration. It has an antenna input 111 and a switch output 112. Antenna input 111 and switch output 112 are connected to one another by a line 113. In series with this line 113, a first series circuit 114 comprising an inductance L1 and a capacitance C1 and a second series circuit 115 comprising an inductance L2 and a capacitance C2 are connected. Between the two series circuits 114, 115, a parallel circuit 116 comprising an inductor L3 and a capacitor C3 is connected in parallel with line 113. The parallel circuit 113 is connected to the ground 8.
  • Such a filter can have the following component data:
  • Ll from 0.1 to 22 nH
  • L2 from 0.1 to 22 nH
  • e-L3 from 0.1 to 22 nH
  • the capacitance C3 can also be protected by a protective element, e.g. a varistor can be replaced.
  • a protective element e.g. a varistor can be replaced.
  • Individual or several combinations of LiCi can also be formed by interconnected transmission lines.
  • FIG. 2 shows a voltage-controlled GaAs switch 9 with an antenna input 1, to which an antenna 18 is connected is.
  • the GaAs switch 9 has transmitter inputs TX] _, TX2 and receiver inputs RX ] _, RX2 and RX3.
  • the GaAs switch 9 is controlled via control inputs S] _, S2, S3, S4, S5.
  • the control takes place in this way . that exactly one of the control inputs S ] _, S2, S3, S4 and S5 is set to "high", while the other control inputs are set to "low”.
  • the number of inputs required can be reduced by the decoder 10 connected to the GaAs switch 9.
  • the decoder 10 can be, for example, a 1 out of 5 decoder.
  • control inputs E, E2 and E3 as well as control outputs A] _, A2, A3, A4 and A5.
  • the control outputs A] _, A2, A3, A4 and A5 are connected by connecting lines 24 to the control inputs S] _, S2, S3, S4, S5 of the GaAs switch 9.
  • control inputs E ⁇ , E2 and E3 of the decoder 10 are connected to control lines 5.
  • the transmitter inputs TX] _, TX2 correspond to the signal inputs 2 from FIG. 1.
  • the receiver inputs RX] _, RX2, and RX3 correspond to the signal outputs 3 from FIG. 1.
  • FIG. 3 shows a switching module with a GaAs switch 9, which has an antenna input 1 and two signal inputs 2 and three signal outputs 3.
  • the switching module has two low-pass filters 13, 14, the low-pass filter 13 for the GSM frequency band and the low-pass filter 14 for the PCN / PCS frequency band.
  • the GaAs switch 9 optionally connects one of the inputs / outputs 2, 3 to its antenna input 1.
  • the switching module also has bandpass filters 15, 16, 17, which are connected to the signal outputs 3.
  • the bandpass filter 15 is adapted to the GSM frequency, the bandpass filter 16 to the PCN frequency and the bandpass filter 17 to the PCS frequency.
  • the bandpass filter 15, 16, 17 at the signal output 3 can be made less demanding in its specification, since part of the filtering is carried out by the ESD protection device. Overall, this improves insertion loss.
  • the signal inputs 2 of the GaAs switch 9 There are the signal inputs 2 of the GaAs switch 9 with transmitter amplifiers 19 electrically connected.
  • the transmitter amplifiers 19, like the low-pass filters 13, 14, are adapted to the radio frequencies GSM or PCN / PCS.
  • the signal outputs 3 are electrically conductively connected to receiver amplifiers 19a via the bandpass filters 15, 16, 17, the receiver amplifiers 19a being adapted to the frequency bands GSM, PCN or PCS.
  • the antenna input 1 of the GaAs switch 9 is connected to an antenna 18.
  • the signals received by the antenna 18 can now be fed to either the bandpass filter 16, the bandpass filter 17 or the bandpass filter 15 by means of the GaAs switch 9, where they are filtered depending on the radio frequency used and further processed in amplifiers 19a.
  • the from the transmitter amplifiers 19 delivered signals are filtered by the low-pass filter 13, 14 and optionally supplied to the antenna 18 for transmitting a signal.
  • FIG. 4 shows a switching module with a multilayer ceramic substrate 20, in which passive components 21, 22, 23 are integrated. These passive components 21, 22, 23 can be, for example, resistors 21, capacitors 22 and inductors 23.
  • the multilayer ceramic substrate 20 can be designed in a manner known per se. Ceramic layers 30 stacked on top of one another, which are separated from one another by metallic layers 31, can be used as multilayer ceramic substrate 20. Some of the metallic layers 31 are connected to one another by vias 32 running inside the ceramic layers 30.
  • a switching unit 4 is mounted on the upper side of the ceramic substrate 20, which switching unit can be a gallium arsenide multiple switch mounted in flip-chip technology, for example.
  • the switching unit 4 can be attached and electrically contacted, for example, by gluing and additional wire bonding.
  • a GaAs multiple switch is preferably used as the switching unit 4. Such a switch can have an insertion loss of in the frequency range between 1 and 2 GHz
  • It can be an integrated circuit with FET made on the basis of gallium arsenide, the pin surfaces of which are soldered to the ceramic substrate
  • the switching unit 4 can also be attached to the multilayer ceramic substrate 20 and electrically connected by means of wire bonding. A connection by means of soldering is preferably used if the switching unit 4 is used with an additional housing.
  • the passive components 21, -22, 23 can form the filters 13, 14, 15, 16, 17 required according to FIG. 3.
  • the first protective device 6 and the second protective device 7 are also mounted on the surface of the substrate 20. This achieves a high degree of integration for the switching module according to the invention, which has a positive effect on the space requirement of the switching module.
  • the individual components of the first protective device 6 can be arranged on the upper side of the ceramic substrate 20. Individual components, such as the capacitances C1, C2, C3, can also be integrated in the ceramic substrate 20, corresponding to the passive components 21, 22, 23.
  • the invention is not limited to the examples mentioned for the second and third protective device, rather all conceivable protective devices can be used in the circuit arrangement according to the invention.
  • the circuit arrangement or the switching module is not limited to use in mobile telephones.
  • TX ⁇ TX2 transmitter inputs

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Transceivers (AREA)
  • Electronic Switches (AREA)
  • Transmitters (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)

Abstract

L'invention concerne une circuiterie comprenant une entrée d'antenne (1), une entrée de signal (2), une sortie de signal (3), ainsi qu'une unité de commutation (4). Dans cette circuiterie, l'entrée d'antenne (1) est reliée à un premier dispositif de protection (6) contre les décharges électrostatiques, qui est un filtre passe-bande en configuration T. Grâce à ce premier dispositif de protection (6), on peut renoncer à un filtre passe-bande dans le module frontal lors de l'utilisation dans un téléphone mobile. En outre, le filtre passe-bande présente une très bonne caractéristique de filtrage permettant d'éliminer efficacement des perturbations liées à des décharges électrostatiques. L'invention concerne également un module de commutation et l'utilisation de ce module de commutation.
PCT/DE2002/003662 2001-09-28 2002-09-27 Circuiterie, module de commutation comprenant cette circuiterie et utilisation de ce module de commutation WO2003030382A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US10/490,914 US7492565B2 (en) 2001-09-28 2002-09-27 Bandpass filter electrostatic discharge protection device
JP2003533455A JP4008881B2 (ja) 2001-09-28 2002-09-27 回路装置、該回路装置を有するスイッチングモジュール、および該スイッチングモジュールの使用方法

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE10148016.4 2001-09-28
DE10148016 2001-09-28
DE10201435.3 2002-01-16
DE2002101435 DE10201435B4 (de) 2002-01-16 2002-01-16 Schaltungsanordnung mit einem Antenneneingang

Publications (1)

Publication Number Publication Date
WO2003030382A1 true WO2003030382A1 (fr) 2003-04-10

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ID=26010251

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2002/003662 WO2003030382A1 (fr) 2001-09-28 2002-09-27 Circuiterie, module de commutation comprenant cette circuiterie et utilisation de ce module de commutation

Country Status (2)

Country Link
JP (1) JP4008881B2 (fr)
WO (1) WO2003030382A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003069730A1 (fr) * 2002-02-13 2003-08-21 Siemens Mobile Communications S.P.A. Dispositif de protection pour des lignes de communication contre des surtensions causees par la foudre
US7492565B2 (en) 2001-09-28 2009-02-17 Epcos Ag Bandpass filter electrostatic discharge protection device
US8014731B2 (en) 2001-01-18 2011-09-06 Epcos Ag Electric circuit module, circuit module arrangement and use of said circuit module and of said circuit module arrangement
US8116046B2 (en) 2002-10-02 2012-02-14 Epcos Ag Circuit arrangement that includes a device to protect against electrostatic discharge

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4783846A (en) * 1987-06-04 1988-11-08 General Instrument Corporation Switchable signal source module for use with cable television converter
JPH06112850A (ja) * 1992-09-28 1994-04-22 Fujitsu Ltd 静電保護回路
EP0681365A1 (fr) * 1994-05-02 1995-11-08 Pioneer Electronic Corporation Circuit pour empêcher la destruction électrostatique et appareil de réception l'utilisant
EP1037308A1 (fr) * 1999-03-18 2000-09-20 Telefonaktiebolaget Lm Ericsson Filtre électrique pour filtrer fréquences baisses
DE19931056A1 (de) * 1999-07-06 2001-01-25 Epcos Ag Vielschichtvaristor niedriger Kapazität
EP1073208A2 (fr) * 1999-07-29 2001-01-31 Murata Manufacturing Co., Ltd. Commutateur de radiofréquences
DE19944489A1 (de) * 1999-09-16 2001-04-19 Infineon Technologies Ag ESD-Schutzanordnung für Signaleingänge und -ausgänge bei Halbleitervorrichtungen mit Substrattrennung
JP2001127663A (ja) * 1999-10-29 2001-05-11 Ngk Spark Plug Co Ltd 静電気保護回路
WO2002058239A2 (fr) * 2001-01-18 2002-07-25 Epcos Ag Module de commutation electrique, son mode de couplage et leur utilisation

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4783846A (en) * 1987-06-04 1988-11-08 General Instrument Corporation Switchable signal source module for use with cable television converter
JPH06112850A (ja) * 1992-09-28 1994-04-22 Fujitsu Ltd 静電保護回路
EP0681365A1 (fr) * 1994-05-02 1995-11-08 Pioneer Electronic Corporation Circuit pour empêcher la destruction électrostatique et appareil de réception l'utilisant
EP1037308A1 (fr) * 1999-03-18 2000-09-20 Telefonaktiebolaget Lm Ericsson Filtre électrique pour filtrer fréquences baisses
DE19931056A1 (de) * 1999-07-06 2001-01-25 Epcos Ag Vielschichtvaristor niedriger Kapazität
EP1073208A2 (fr) * 1999-07-29 2001-01-31 Murata Manufacturing Co., Ltd. Commutateur de radiofréquences
DE19944489A1 (de) * 1999-09-16 2001-04-19 Infineon Technologies Ag ESD-Schutzanordnung für Signaleingänge und -ausgänge bei Halbleitervorrichtungen mit Substrattrennung
JP2001127663A (ja) * 1999-10-29 2001-05-11 Ngk Spark Plug Co Ltd 静電気保護回路
WO2002058239A2 (fr) * 2001-01-18 2002-07-25 Epcos Ag Module de commutation electrique, son mode de couplage et leur utilisation

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Title
BENZ ET AL: "Tabellenbuch Radio- und Fernsehtechnik Funkelektronik", 1993, KIESER-VERLAG, NEUSÄSS, XP002232831 *
PATENT ABSTRACTS OF JAPAN vol. 018, no. 390 (E - 1582) 21 July 1994 (1994-07-21) *
PATENT ABSTRACTS OF JAPAN vol. 2000, no. 22 9 March 2001 (2001-03-09) *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8014731B2 (en) 2001-01-18 2011-09-06 Epcos Ag Electric circuit module, circuit module arrangement and use of said circuit module and of said circuit module arrangement
US7492565B2 (en) 2001-09-28 2009-02-17 Epcos Ag Bandpass filter electrostatic discharge protection device
WO2003069730A1 (fr) * 2002-02-13 2003-08-21 Siemens Mobile Communications S.P.A. Dispositif de protection pour des lignes de communication contre des surtensions causees par la foudre
US8116046B2 (en) 2002-10-02 2012-02-14 Epcos Ag Circuit arrangement that includes a device to protect against electrostatic discharge

Also Published As

Publication number Publication date
JP4008881B2 (ja) 2007-11-14
JP2005505185A (ja) 2005-02-17

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