WO1992017017A1 - Senderendstufe - Google Patents
Senderendstufe Download PDFInfo
- Publication number
- WO1992017017A1 WO1992017017A1 PCT/DE1992/000134 DE9200134W WO9217017A1 WO 1992017017 A1 WO1992017017 A1 WO 1992017017A1 DE 9200134 W DE9200134 W DE 9200134W WO 9217017 A1 WO9217017 A1 WO 9217017A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- output stage
- transmitter output
- bus
- stage according
- components
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0264—Arrangements for coupling to transmission lines
- H04L25/028—Arrangements specific to the transmitter end
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L12/40006—Architecture of a communication node
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L2012/40208—Bus networks characterized by the use of a particular bus standard
- H04L2012/40215—Controller Area Network CAN
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0264—Arrangements for coupling to transmission lines
- H04L25/0278—Arrangements for impedance matching
Definitions
- the invention relates to a transmitter output stage for a data transmission system comprising at least one control unit and data transmission lines according to the preamble of claim 1.
- Transmitter output stages for data transmission systems in particular for controller area network bus systems (CAN bus systems) are known.
- digital signals from a control unit of the data bus system for example a CAN controller, are output to the data bus.
- a control unit of the data bus system for example a CAN controller
- Electromagnetic interference signals can also act on the data lines and thus on the transmitter output stage.
- the disadvantage of the known transmitter output stages is that they take up a relatively large amount of space and the application possibilities are therefore limited.
- the transmitter output stage according to the invention has the advantage that it takes up very little space and is easy to assemble.
- the manufacturing costs of both the transmitter output stage and the overall system into which the transmitter output stage is integrated can thus be greatly reduced, and the failure rates of the system can also be reduced with the aid of the transmitter output stage at hand.
- This is achieved in particular in that all switching elements of the transmitter output stage are accommodated on a semiconductor substrate, that is to say the entire circuit is integrated monolithically.
- An embodiment of the transmitter output stage is preferred in which a switching stage is assigned to each of the data lines of the bus system. In this way, optimum interference immunity can be achieved.
- An embodiment of the transmitter output stage is further preferred, in which the components of the output stage circuit are preferably arranged in series connection, in such a way that the interaction of the components with one another is minimized.
- the diffusion of different areas on the substrate for the manufacture of the individual components creates parasitic components which impair the function of the individual circuit elements. Such effects and parasitic components can be avoided or minimized by the layout and the chosen circuit arrangement of the transmitter output stage.
- An embodiment of the transmitter output stage is particularly preferred in which separate pre-driver stages are assigned to the electronic switches of the output stage circuits. In this way, the signal delay of the circuit can be significantly reduced, that is, digital signals can be transmitted at a high transmission rate.
- the transmitter output stage is characterized in that resistors are directly assigned to the connections of the data lines. In this way, the interaction of the data bus with the transmitter can be influenced by appropriate selection of the resistors.
- the resistors can be produced by a diffusion process, they are designed as lying in so-called floating troughs.
- the current can be limited to ground or supply voltage in the event of electromagnetic interference or short-circuits of the CAN H or CAN-L terminals, so that the transmitter output stage or its components are not damaged or damaged
- the internal resistance of the output stage can be stabilized, so that the switching behavior of the transmitter output stage can be adjusted particularly well to the CAN bus.
- an embodiment of the transmitter output stage is preferred in which parasitic components, in particular parasitic transistors, resulting from the manufacture of the resistors, the floating troughs are combined with a compensation circuit, so that the effect of these parasitic components is eliminated. This measure allows the switching behavior of the transmitter output stage to be optimally adjusted.
- An embodiment of the transmitter output stage is particularly preferred in which the compensation circuit is designed as a diode.
- an embodiment of the transmitter output stage is preferred in which the output stage circuits, in particular their diodes, are designed such that in the event of a short circuit in the associated data lines to ground or to the ground Supply voltage and / or in the event of a mass offset, the current flowing through the components of the transmitter output stage is limited and a malfunction of the module is prevented. In this way, malfunctions or even damage to these components can be reduced to a minimum.
- Figure 1 is a block diagram of a CAN driver, among other things, with a transmitter output stage and with an indicated CAN bus and
- Figure 2 shows a basic circuit of the separate transmitter output stage.
- the transmitter output stage according to the invention can in principle be used for any data transmission devices. It will be explained below using a CAN bus system.
- FIG. 1 shows a CAN driver 1, the switching element of which is encompassed by a dashed line.
- a CAN bus CB which is designed here as a two-wire bus, is connected to the CAN driver 1 via suitable lines L1 and L2. Via these lines L1 and L2, signals are transmitted on the one hand from the driver to the bus and on the other hand in the opposite direction from the transmitter output stage to the bus. These lines are connected to two connection points CAN H and CAN ⁇ of the CAN driver.
- the CAN driver 1 according to FIG. 1 has further connections, namely a connection + V CC , to which a positive supply voltage can be connected, and a terminal V SS , to which, for example, ground is connected.
- Signals from a control circuit (not shown here) or from a CAN controller are applied via a line L3 to a terminal identified by T ⁇ 0 .
- the final stage circuit comprises a first diode D 17 whose anode is applied to the terminal + V CC . It is electrically conductively connected to a MOS transistor T1, which is designed here, for example, as a depletion MOSFET.
- the cathode of D j is connected to the drain terminal D and to the bulk terminal B of the transistor T1.
- the source terminal S of the transistor leads to the via a resistor Rl Terminal CAN H>
- the transistor T1 shown here is designed as a p-channel fet.
- the gate terminal G of the transistor T1 is connected to the output of a driver circuit 3, which is only indicated here.
- a second amplifier circuit E2 of Senderend ⁇ stage is connected between terminal CAN L and terminal V ss.
- a resistor R2 is connected directly to the CAN L terminal, which on the other hand is connected to the anode of a diode D 2 .
- Their cathode is connected to the source terminal S of a second transistor T2, which is also designed as a depletion MOS FET.
- Its bulk connector B and drain connector D are connected to one another and are connected to the terminal V SS .
- the gate terminal G of the second transistor T2 is in turn connected to the output of a driver circuit 5 which is only shown in outline.
- the two driver circuits 3 and 5 of the output stage circuits E1 and E2 are controlled via lines L6 and L7 by a switch-off logic circuit 7, which serves to protect the output stage transistors T1 and T2 against damage in the event of a short circuit or polarity reversal.
- This is a circuit of a known type, so that its description is omitted.
- the signals of the CAN controller are applied to the input line L8 of the shutdown logic circuit 7 via the line L3 and via the terminal T ⁇ Q .
- This also has an AND circuit 9, whose inputs L9 and LIO are connected to the terminals CAN H and CAN L via comparator circuits 11 and 13.
- the signals of the CAN bus CB present at the terminal CAN H are connected via a line L11 to a first input of a comparator 11, at whose second input there is a fixed reference voltage of, for example, 8V.
- Signals of the CAN bus CB which are present at the terminal CAN L are connected via a line L13 to a first input of a comparator 13, at the second input of which a reference voltage of, for example, 8V is applied.
- the CAN driver 1 comprises still a voltage divider 15, the driver block is specified by the terminal to the R ⁇ l an outer Re ⁇ ferenz voltage for another circuit.
- the CAN driver 1 has an input comparator 17, at the first input of which signals from the CAN H terminal are connected via a line L15 and at the second input of which signals from the CAN L terminal are connected via a line L17. This means that the signals coming in from the CAN bus CB are on the input side of the receiving comparator 17.
- the output of the receiving comparator 17 is connected to the terminal R ⁇ Q via a line L19.
- the signals present at this terminal are forwarded to the CAN controller via line L4.
- FIG. 1 thus shows a section of a CAN bus system, the CAN bus CB of which is designed as a two-wire bus, as is used, for example, in motor vehicles.
- the on the CAN bus existing signals are connected to the CAN H and CAN L terminals of the CAN driver 1 via the lines L1 and L2, processed by the receiving comparator 17 and forwarded to the CAN controller via the line R4 via the line R4 .
- signals from the CAN controller can be connected to the output stage circuits El and E2 of the transmitter output stage via the terminal T ⁇ 0 and via the switch-off logic 7 and thus reach the terminals CAN H and CAN L.
- Such signals emitted by the CAN controller can then be emitted to the CAN bus via lines L1 and L2.
- transmitter output stage 18 is again shown separately in FIG. 2, parts that correspond in FIGS. 1 and 2 being provided with the same reference numerals.
- a line L21 is connected to the terminal + V CC , while a line L23 is connected to the terminal V ss in an electrically conductive manner.
- the first pre-driver 3 assigned to the first switching stage E1 is connected on the one hand to the line L21, that is to say connected to the voltage supply + V CC , and on the other hand to the line L23, which is here connected to ground.
- the output of the pre-driver 3 is at the gate terminal G of the first transistor T1, which, as explained, is designed as a MOS-FET.
- the resistance R1 of the first output stage circuit E1 is laid out lying in a floating trough, which is indicated by a dashed rectangle.
- a p-diffused area is introduced into an n-epitaxy.
- the interplay of the tub creates a parasitic component with the rest of the substrate a parasitic transistor.
- the overall function of the transmitter output stage 18 is thereby impaired. Therefore, a compensation circuit is provided here, which is designed here as a diode D10.
- the parasitic transistor is eliminated in that the floating trough of the resistor R1 is connected to the voltage supply + V CC via the diode D10.
- a resistor D1 is assigned a diode D10, the cathode of which lies on the well of the resistor and its anode on line L21, that is to say on the voltage supply + V CC .
- the second switching stage E2 is designed accordingly.
- the designed as MOS-FET transistor T2 of the second switching stage E2 is connected directly to the line L23, that is to ground; at its drain terminal D is the cathode of the diode D2, the anode of which is connected on the other hand to the resistor R2.
- the second connection of this resistor R2 is connected to the terminal CAN L assigned to the second wire of the data bus CB.
- Resistor R2 is also designed to lie in a so-called floating trough. It is produced by the formation of a p-diffused area within an n-epitaxy, again a parasitic component, namely a transistor arises from the interaction with the substrate. The effect of this parasitic transistor is in turn eliminated by a compensation circuit designed as a diode, namely by the diode D20, the cathode of which is in turn connected to the well of the resistor R2, while its anode is connected to the line L21 and thus to the supply voltage is + V CC .
- the pre-driver 5 associated with this switching stage E2 is connected to the gate terminal G of the transistor T2 and is in turn connected to the line L21 on the one hand and to ground or the line L23 on the other hand.
- the signals fed to the pre-drivers 3 and 5, which are ultimately supplied by the CAN controller, are indicated by a dashed line on the input side of the pre-drivers.
- the transmitter output stage 18, which can be seen in particular in FIG. 2, is particularly designed for the operation of a data transmission system or for a CAN bus system in a motor vehicle, where a particularly large number of interference signals occur. Due to the low-impedance coupling to the CAN bus CB, the transmitter output stage is particularly at risk from the interference signals which arise on the one hand from short-circuiting of the data bus lines to ground or against the supply voltage and on the other hand from a ground offset.
- the individual components of the switching stages E1 and E2 are arranged and designed in such a way that in the case of such interference signals, which can also be based on electromagnetic influences, damage the transmitter output stage and malfunction of the component can be avoided.
- the resistors R1 and R2 limit the current through the switching stages in the event of interference peaks which are generated by electromagnetic signals or short circuits. At the same time, the internal resistance of the transmitter output stage is stabilized, so that its low-reflection connection to the closed bus system remains guaranteed.
- the diodes D1 and D2 are arranged within the switching stages and manufactured in the manufacture of the transmitter output stages in such a way that the transmitter end stage against a short circuit in the bus lines against battery or ground, ie in the event of a short circuit in the connecting terminals CAN H and CAN L against + V CC or V ss are protected and the full function is maintained. At the same time, it is ensured that a mass offset does not cause damage to the components of the circuit or malfunction of the component.
- the pre-drivers 3 and 5 which are inserted between the output of the CAN controller and the output stage transistors T1 and T2, ensure a minimal delay time for the transmitter output stage 18, so that it also transmits signals designally high data rate is suitable and leads to minimal distortion.
- the monolithically integrated transmitter output stage is constructed very small and can be integrated in a CAN driver.
- the introduction or assembly of such a transmitter output stage or the associated one Driver in a control circuit of a motor vehicle accommodating these modules very easily and inexpensively.
- the probability of failure of such installed modules is particularly low, since the electrical connection of the individual switching elements is reliably ensured even with high mechanical loads, for example.
- lines here, for example can practically not break due to vibrations.
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Power Engineering (AREA)
- Dc Digital Transmission (AREA)
- Logic Circuits (AREA)
- Electronic Switches (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/119,093 US5448180A (en) | 1991-03-16 | 1992-02-22 | Transmitter end stage |
DE59208690T DE59208690D1 (de) | 1991-03-16 | 1992-02-22 | Monolithisch integrierte senderendstufe |
JP50485592A JP3179098B2 (ja) | 1991-03-16 | 1992-02-22 | モノリシック集積回路装置 |
EP92905404A EP0576444B1 (de) | 1991-03-16 | 1992-02-22 | Monolithisch integrierte senderendstufe |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEP4108610.4 | 1991-03-16 | ||
DE4108610A DE4108610A1 (de) | 1991-03-16 | 1991-03-16 | Senderendstufe |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1992017017A1 true WO1992017017A1 (de) | 1992-10-01 |
Family
ID=6427464
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE1992/000134 WO1992017017A1 (de) | 1991-03-16 | 1992-02-22 | Senderendstufe |
Country Status (6)
Country | Link |
---|---|
US (1) | US5448180A (de) |
EP (1) | EP0576444B1 (de) |
JP (1) | JP3179098B2 (de) |
DE (2) | DE4108610A1 (de) |
ES (1) | ES2104901T3 (de) |
WO (1) | WO1992017017A1 (de) |
Cited By (6)
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GB2288522A (en) * | 1994-04-11 | 1995-10-18 | Daimler Benz Ag | Monitoring a two-wire bus system for faults |
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Cited By (15)
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FR2700431A1 (fr) * | 1992-12-25 | 1994-07-13 | Mitsubishi Electric Corp | Dispositif d'entrée/sortie bifilaire avec détection d'anomalie. |
US5485580A (en) * | 1992-12-25 | 1996-01-16 | Mitsubishi Denki Kabushiki Kaisha | Circuit for detecting transmission bus's abnormality and for controlling output drivers in a complementary signal transmission device |
GB2288522A (en) * | 1994-04-11 | 1995-10-18 | Daimler Benz Ag | Monitoring a two-wire bus system for faults |
GB2288522B (en) * | 1994-04-11 | 1998-07-08 | Daimler Benz Ag | Monitoring means for monitoring a two-wire bus system |
US5781585A (en) * | 1994-04-11 | 1998-07-14 | Daimler Benz Aktiengesellschaft | Arrangement for monitoring a two-wire bus line |
WO2000069124A1 (de) * | 1999-05-07 | 2000-11-16 | Siemens Aktiengesellschaft | Datenübertragungssystem, insbesondere in einem kraftfahrzeug, und datenübertragungsverfahren |
EP1050999A1 (de) * | 1999-05-07 | 2000-11-08 | Siemens Aktiengesellschaft | Datenübertragungssystem, insbesondere in einem Kraftfahrzeug, und Datenübertragungsverfahren |
US6693372B2 (en) | 1999-05-07 | 2004-02-17 | Siemens Aktiengesellschaft | Data transmission system, particularly in a motor vehicle, and data transmission method |
WO2014062397A1 (en) * | 2012-10-18 | 2014-04-24 | Schneider Electric USA, Inc. | Full-duplex signaling for arc event protection |
US9373980B2 (en) | 2012-10-18 | 2016-06-21 | Schneider Electric USA, Inc. | Full-duplex signaling for arc event protection |
WO2015067459A1 (de) * | 2013-11-08 | 2015-05-14 | Robert Bosch Gmbh | Teilnehmerstation für ein bussystem und verfahren zur reduzierung von leitungsgebundenen emissionen in einem bussystem |
US10218543B2 (en) | 2013-11-08 | 2019-02-26 | Robert Bosch Gmbh | Subscriber station for a bus system and method for reducing wire-bound emissions in a bus system |
RU2684164C2 (ru) * | 2013-11-08 | 2019-04-04 | Роберт Бош Гмбх | Абонентская станция для шинной системы и способ уменьшения кондуктивной помехоэмиссии в шинной системе |
RU2700170C2 (ru) * | 2013-11-08 | 2019-09-13 | Роберт Бош Гмбх | Абонентская станция для шинной системы и способ уменьшения кондуктивной помехоэмиссии в шинной системе |
US10530612B2 (en) | 2013-11-08 | 2020-01-07 | Robert Bosch Gmbh | Subscriber station for a bus system and method for reducing line-related emissions in a bus system |
Also Published As
Publication number | Publication date |
---|---|
DE4108610A1 (de) | 1992-09-17 |
JPH06505140A (ja) | 1994-06-09 |
US5448180A (en) | 1995-09-05 |
DE59208690D1 (de) | 1997-08-14 |
ES2104901T3 (es) | 1997-10-16 |
EP0576444B1 (de) | 1997-07-09 |
EP0576444A1 (de) | 1994-01-05 |
JP3179098B2 (ja) | 2001-06-25 |
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