WO2003030385A1 - Circuit, module de commutation comprenant ce circuit et utilisation de ce module de commutation - Google Patents

Circuit, module de commutation comprenant ce circuit et utilisation de ce module de commutation Download PDF

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Publication number
WO2003030385A1
WO2003030385A1 PCT/DE2002/003666 DE0203666W WO03030385A1 WO 2003030385 A1 WO2003030385 A1 WO 2003030385A1 DE 0203666 W DE0203666 W DE 0203666W WO 03030385 A1 WO03030385 A1 WO 03030385A1
Authority
WO
WIPO (PCT)
Prior art keywords
circuit arrangement
arrangement according
switching unit
protective device
antenna
Prior art date
Application number
PCT/DE2002/003666
Other languages
German (de)
English (en)
Inventor
Christian Block
Holger FLÜHR
Kurt Wiesbauer
Johann Riedler
Heinz Ragossnig
Heinz Florian
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 DE2002101436 external-priority patent/DE10201436B4/de
Application filed by Epcos Ag filed Critical Epcos Ag
Publication of WO2003030385A1 publication Critical patent/WO2003030385A1/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
    • H04B1/06—Receivers
    • H04B1/16—Circuits
    • H04B1/18—Input circuits, e.g. for coupling to an antenna or a transmission line
    • 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.
  • the circuit arrangement has a control line.
  • 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 protective 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 electrical Trostatic discharge also generate a high voltage on the circuit arrangement via ground coupling. This can happen, for example, in that the control input usually used in a switch is either at a high potential (high) or at a low potential
  • the high potential is defined in that it is, for example, 2.3 V above the ground potential of the circuit arrangement. Since in a mobile phone as in many other devices based on signal transmission using antennas, the signal coupling from the
  • 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 aim of the present invention is therefore to provide a circuit arrangement of the type mentioned at the outset which has improved protection against electrostatic discharges.
  • 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.
  • the antenna input is connected to a first protective device against electrostatic discharge.
  • the control line is also connected to a second protective device against electrostatic discharge.
  • the second protection device is a Zener diode.
  • a Zener diode has the advantage that it has a very low residual voltage. For example, a higher voltage can no longer build up at the Zener diode from a voltage of 0.7 V in the forward direction, since the Zener diode is already conductive in this case.
  • the residual voltage is dependent on the Zener voltage, which can be 3.9 V, for example.
  • the residual voltage is the voltage that can drop to a maximum at the component selected as the protective device.
  • the residual voltage also determines the part of the voltage of the ESD voltage pulse that can stress the circuit arrangement.
  • Zener diodes also have the advantage that they have a fast response time.
  • Z-diodes are voltage-controlled switches in which high capacitance would be an obstacle due to an extended switching time. Since Zener diodes have smaller small capacitances, they have the advantage of a very fast response time.
  • the protective devices against electrostatic discharges are advantageously connected to a ground connection, into which the overvoltages of the electrostatic discharge can be derived.
  • 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.
  • Series resistors can also be connected in series with the control lines, which serve as additional protection of the circuit arrangement against overload.
  • the gallium arsenide switch 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 in such a way that the voltages of the control lines are generated from the voltage of the supply line. 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 third protective device can also be designed as a Zener diode.
  • a series resistor can also be connected in series with the supply line, which offers further protection of the circuit arrangement against destruction.
  • the circuit arrangement can also contain frequency filters which are assigned to individual signal inputs or signal outputs. They are particularly suitable for using the ⁇ O ⁇ on a mobile phone. Fil the frequencies picked up by the antenna so that the filtered signals routed via the signal output can be processed further by the mobile phone. The same applies to the signal inputs of the circuit arrangement, which are used in a mobile phone to send voice signals generated in the mobile phone via the antenna to a receiver.
  • an electrical frequency filter can be used as the first protective device against electrostatic discharges.
  • a voltage limiting element such as a varistor or a switching spark gap into consideration.
  • the circuit arrangement according to the invention has the advantage that the protective measure against ESD at the antenna input can be made less complex due to the additional ESD protection on the control line of the switching unit.
  • the first protective device is an electrical filter
  • the protective device at the antenna input can be designed in the form of an electrical frequency filter, the insertion loss of which is less than 0.3 dB.
  • 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.
  • the first and second protective devices against electrostatic discharges are integrated 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 first and second protective devices can be integrated into the switching module, for example, by building these components on the surface of the ceramic substrate next to the switching unit.
  • 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.
  • Figure 3 shows the use of the circuit arrangement according to the invention in a mobile phone based on a schematic 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.
  • the switching unit 4 shown in FIG. 1 also has a decoder, for which a supply line 11 is required.
  • the supply line 11 is connected to a supply voltage + Vcc.
  • the supply supply line 11 connected to a third protective device 12 against electrostatic discharge.
  • the first protective device 6 can be a frequency filter or a varistor, for example.
  • the second and third protective devices 7, 12 are Z-diodes with a forward voltage of 0.7 V and with a Zener voltage of 3.9 V.
  • the Z-diodes are connected to ground 8.
  • Series resistors 25 are connected in series with the control lines 5 and the supply line 11, which further protect the switching unit 4 against destruction by high voltages. Positive voltage peaks are cut off by the Zener breakdown, negative voltage peaks by the forward voltage of the Zener diode.
  • FIG. 2 shows a voltage-controlled GaAs switch 9 with an antenna input 1, to which an antenna 18 is connected.
  • the GaAs switch 9 has transmitter inputs TX] _, T ⁇ 2 and receiver inputs RX] _, RX2 and RX 3 .
  • the GaAs switch 9 is controlled via control inputs S- [, S 2 , S 3 , S 4 , S5. The control takes place in such a way that exactly one of the control inputs S] _, S2, S 3 , S 4 and S5 is set to "high", while the other control inputs are set to "low”. Due to the decoder 10 connected to the GaAs switch 9, the
  • the decoder 10 can be, for example, a 1 out of 5 decoder. It has control inputs E] _, E2 and E 3 as well as control outputs A ] _, A 2 , A 3 , A4 and A 5 .
  • the control outputs A ⁇ _, A2 / A 3 , A 4 and A5 are connected by control lines 24 to the control inputs S] _, S 2 , S 3 , S 4 , S 5 of the GaAs switch 9.
  • control inputs E ⁇ , E 2 and E 3 of the decoder 10 are connected to control lines 5.
  • the transmitter inputs TXj_, TX 2 correspond to the signal inputs 2 from FIG. 1.
  • the receiver inputs RX] _, RX2, and RX 3 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 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 connected to the radio sequences GSM or PCN / PCS adapted.
  • 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 in amplifiers
  • the signals supplied by the transmitter amplifiers 19 are filtered by the low-pass filters 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 0.8 dB in the frequency range between 0.1 and 0.5 GHz. It may be one on Galliu- marsenide-based integrated circuit trade with FET, the pin surfaces can be connected to the ceramic substrate 20 by soldering.
  • 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.
  • 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.
  • Such a switching module can be used, for example, in mobile telephones, which is why the advantageous use of the switching module according to the invention as a front-end module in a mobile radio device is a further subject of the invention.
  • the invention is not limited to the examples mentioned for the first and third protective devices, 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. LIST OF REFERENCE NUMBERS
  • TX] _ TX 2 transmitter inputs-

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Transceivers (AREA)

Abstract

La présente invention concerne un circuit comprenant une entrée d'antenne (1), une entrée de signal (2), une sortie de signal (3), ainsi qu'une unité de commutation (4), qui présente une ligne de contrôle (5) permettant de commander l'éventuelle connexion de l'entrée d'antenne (1) à l'entrée de signal (2) ou à la sortie de signal (3). Selon cette invention, ladite entrée d'antenne (1) est connectée à un premier dispositif de protection (6) et ladite ligne de contrôle (5) est connectée à un second dispositif de protection (7) conçus pour assurer une protection contre les décharges électrostatiques. Ledit second dispositif de protection (7) est une diode Zener. Il est avantageux d'utiliser une diode Zener car celle-ci permet de n'obtenir qu'une faible tension résiduelle des impulsions ESD. La présente invention concerne également un module de commutation et l'utilisation de ce module de commutation.
PCT/DE2002/003666 2001-09-28 2002-09-27 Circuit, module de commutation comprenant ce circuit et utilisation de ce module de commutation WO2003030385A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE10148012 2001-09-28
DE10148012.1 2001-09-28
DE10201436.1 2002-01-16
DE2002101436 DE10201436B4 (de) 2002-01-16 2002-01-16 Schaltungsanordnung mit einem Antenneneingang und deren Verwendung

Publications (1)

Publication Number Publication Date
WO2003030385A1 true WO2003030385A1 (fr) 2003-04-10

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2002/003666 WO2003030385A1 (fr) 2001-09-28 2002-09-27 Circuit, module de commutation comprenant ce circuit et utilisation de ce module de commutation

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WO (1) WO2003030385A1 (fr)

Citations (8)

* 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
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 (8)

* 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
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

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
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) *

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