US5448180A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transmitter end stage
Assignee: Robert Bosch GmbH
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Filing: 1992-02-22
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Granted: 1995-09-05
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Expires: 2012-02-22
Abstract
Abstract A transmitter end stage for a data transmission system comprising at least one control unit and data transmission lines, especially for a CAN bus system having at least one CAN controller and one CAN bus (CB) is proposed, characterized by the fact that the individual circuit elements of transmitter end stage 18 are integrated monolithically. As a result of the special layout and its circuit-design arrangement of the individual elements (3, 5; R1, D1, T1; R2, D2, T2; D10, D20) of the transmitter end stage, the effects of malfunctions, for example of short circuits of the data lines to ground or to the supply voltages, are reduced to a minimum. As a result of the special choice of pre-drivers (3, 5), minimum delay times are achieved, so that signals can be transmitted at a higher data rate.
Inventors
- 👤 Rainer Kienzler
- 👤 Ulrich Fleischer
- 👤 Berthold Elbracht
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:18
CPC Classifications
H; H04; H04L; H04L25/00; H04L25/02; H04L25/0264; H04L25/028; H04L12/00; H04L12/28; H04L12/40; H04L12/40006; H04L2012/40208; H04L2012/40215; H04L25/0278
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
114 words
In a driver associated with a data line of a bus system, a monolithically integrated end-stage circuit comprising: a) a switching transistor, said switching transistor i) electrically coupled between said data line and a supply voltage, ii) controlled by a control signal; b) a resistor, said resistor i) connected in series with said switching transistor, ii) connected to said data line, iii) formed lying in a tub of said monolithically integrated circuit; c) a first diode, said first diode i) including an anode coupled with said supply voltage, ii) including a cathode coupled with said tub of said resistor; and d) a second diode, said second diode connected in series with said switching transistor.
Claim 2
Dependent Claim
114 words
In a driver associated with a data line of a bus system, a monolithically integrated end-stage circuit comprising: a) a switching transistor, said switching transistor i) electrically coupled between said data line and a supply voltage, ii) controlled by a control signal; b) a resistor, said resistor i) connected in series with said switching transistor, ii) connected to said data line, iii) formed lying in a tub of said monolithically integrated circuit; c) a first diode, said first diode i) including an anode coupled with said supply voltage, ii) including a cathode coupled with said tub of said resistor; and d) a second diode, said second diode connected in series with said switching transistor.
Claim 3
Dependent Claim
21 words
The circuit of claim 1 wherein said switching transistor is a field-effect transistor having a gate, a drain, and a source.
Claim 4
Dependent Claim
45 words
The circuit of claim 2 wherein said second diode includes an anode coupled with said supply voltage and a cathode coupled with said source of said switching transistor and wherein said drain of said switching transistor is coupled with said data line via said resistor.
Claim 5
Dependent Claim
14 words
The circuit of claim 3 wherein said switching transistor is a p-channel, enhancement-type MOSFET.
Claim 6
Dependent Claim
51 words
The circuit of claim 2 further comprising a second switching transistor having a source which is connected to ground, a third diode including a cathode coupled with a drain of said second switching transistor, and said third diode including an anode coupled with a second data line via a second resistor.
Claim 7
Dependent Claim
14 words
The circuit of claim 1 wherein said switching transistor is an n-channel, enhancement-type MOSFET.
Claim 8
Dependent Claim
27 words
The circuit of claim 2 further comprising e) a driver circuit, said driver circuit coupled with, and providing control signals to, said gate of said switching transistor.
Claim 9
Dependent Claim
17 words
The circuit of claim 1 wherein said resistor stabilizes an internal resistance of said end stage circuit.
Claim 10
Dependent Claim
19 words
The circuit of claim 1 wherein said resistor limits current flowing through said circuit in the event of malfunctions.
Claim 11
Dependent Claim
20 words
The circuit of claim 1 wherein said resistor limits current flowing through said circuit in the event of electro-magnetic malfunctions.
Claim 12
Dependent Claim
26 words
The circuit of claim 1 wherein said second diode limits current flowing through said circuit in the event of a shorting of said line to ground.
Claim 13
Dependent Claim
28 words
The circuit of claim 1 wherein said second diode limits current flowing through said circuit in the event of a shorting of said line to said supply voltage.
Claim 14
Dependent Claim
22 words
The circuit of claim 1 wherein said second diode limits current flowing through said circuit in the event of a ground reversal.
Claim 15
Dependent Claim
142 words
In a Controller Area Network driver adapted to control a bus, being coupled with a controller, and being provided with a voltage supply, a monolithically integrated end-stage circuit comprising: a) a transistor having a gate, a drain, and a source; b) a data line coupling said bus with said end-stage circuit; c) a resistor, said resistor i) electrically coupled between said data line and said drain of said transistor, and ii) formed lying in a tub of said monolithically integrated end-stage circuit; d) a compensating circuit electrically coupled between said tub of said resistor and said voltage supply; e) a diode electrically coupled between said voltage supply and said source of said transistor; and f) a predriver, said predriver i) having an input based on a signal from said controller, and ii) having an output coupled with said gate of said transistor.
Claim 16
Dependent Claim
142 words
In a Controller Area Network driver adapted to control a bus, being coupled with a controller, and being provided with a voltage supply, a monolithically integrated end-stage circuit comprising: a) a transistor having a gate, a drain, and a source; b) a data line coupling said bus with said end-stage circuit; c) a resistor, said resistor i) electrically coupled between said data line and said drain of said transistor, and ii) formed lying in a tub of said monolithically integrated end-stage circuit; d) a compensating circuit electrically coupled between said tub of said resistor and said voltage supply; e) a diode electrically coupled between said voltage supply and said source of said transistor; and f) a predriver, said predriver i) having an input based on a signal from said controller, and ii) having an output coupled with said gate of said transistor.
Claim 17
Dependent Claim
12 words
The circuit of claim 14 wherein said compensating circuit is a diode.
References Cited (Backward Citations)
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1998-09-04 | 1999-03-06 | 1999-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-09-04 | 2003-03-06 | 2003-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-09-04 | 2007-03-06 | 2007-09-05 | $7700.00 | Window Closed / Lapsed |