JPH0697784A - Constitution unit for pulse shaping - Google Patents

Abstract

(57) [Abstract] [Purpose] To improve the pulse shaping component unit so as to suppress the disturbing radiation caused by the transmission of rectangular pulses as little as possible. A signal edge generator is provided that is configured to generate a pulse having a predetermined slope of rising and falling edges and a rounded state transition from a supplied rectangular pulse.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a pulse shaping component unit.

[0002]

2. Description of the Related Art In a bus system, a pulse train is transmitted as a data word via a line. If such a bus system is used, for example, in a vehicle, it must be noted that unwanted radiation caused by the transmission of rectangular pulses is suppressed as little as possible.

[0003]

SUMMARY OF THE INVENTION It is an object of the invention to improve the pulse shaping component so that the unwanted radiation caused by the transmission of rectangular pulses is suppressed as little as possible.

[0004]

According to the invention, the above object is achieved in that the component comprises a signal edge generator, the signal edge generator comprising a rising edge and a falling edge of a supplied rectangular pulse. Is configured and solved to generate a pulse having a predetermined slope and a rounded state transition.

In this case, attention must be paid to the following. That is, care must be taken so that the data rate to be transmitted is not unnecessarily limited while the individual pulses are kept in pulses with slowed rising and falling and rounded state transitions.

Advantageous embodiments of the invention are described in the dependent claims. With the configuration according to claim 3, output-side control that is independent of load is guaranteed. ISO-standard and SDL
-The operating conditions for the standard can be switched via the control input.

[0007]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 shows the components according to the invention. For example, a microprocessor that outputs a data word in the form of a rectangular pulse group is connected to the terminal 1. The microprocessor and the components of FIG. 1 can be components of the transmitter S, for example. This transmitter S is
Send the command to all one or more receivers E (FIG. 2).
The transmitter and the receiver can be, for example, controllers for drive slip control and engine control of a motor vehicle.

A pulse applied to terminal 1 (which pulse is read via a comparator 2 provided with a reference voltage source 3) is supplied to a signal edge generator 4. This signal edge generator 4 produces from the rectangular pulse a pulse of the shape substantially shown in block 4 with slowed rising and falling and rounded state transitions.

Generation of such a pulse is achieved as follows. That is, by charging an internal capacitor with a constant current and then discharging to get a falling edge. Rounding of the signal waveform is performed by limiting the efficiency of the current source and sink and reducing it to near the limit.

The degree of rise of the edge is 20% to 80% at 2.5 s (or 2.5 μs) for the rise and fall in the case of the ISO standard (operating voltage of 12 V).

SDL-standard (ie 5V operating voltage)
In case of, rise and fall are 13.5s (or 13.5μ)
s) occurs at 1V to 38V (or 1V to 3.8V). The output signal thus formed is the operational amplifier 5
And the output amplification stage 6 to the output terminal 7. In addition, the output signal is feedback-coupled to the operational amplifier 5 via the line 8. This makes them independent of output capacitance, load resistance and receiver input capacitance. As a result, the control for the optimum signal waveform formed inside is performed. The supply of the voltage is different from the supply voltage source (5
V, 12V). Thereby I
It is possible to conform to the SO-standard and the SDL-standard.

[0013]

According to the present invention, unnecessary radiation caused by transmission of a rectangular pulse is slightly suppressed.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment configured according to the present invention.

FIG. 2 shows a single wire system in which the components according to the invention can be used.

[Explanation of symbols]

 1 Terminal 2 Comparator 3 Voltage Source 4 Signal Edge Generator 5 Operational Amplifier 6 Output Amplification Stage 7 Output Terminal 8 Line S Transmitter E1 Receiver E2 Receiver E3 Receiver En Receiver

Claims (5)

[Claims] 1. In a pulse shaping component unit, said component comprises a signal edge generator, said signal edge generator, from a supplied rectangular pulse, having predetermined slopes of rising and falling edges and roundness. A pulse shaping component unit, wherein the pulse shaping component unit is configured to generate a pulse having a certain state transition part. 2. The pulse-shaping component unit according to claim 1, wherein the pulse-shaping component unit is configured to provide a decelerated switching of current sources in the signal edge generator. 3. The operational amplifier is post-connected to the signal edge generator, and the output side of the operational amplifier is feedback-coupled to the second input side of the operational amplifier. The pulse forming component unit. 4. A comparator having a predetermined reference voltage is pre-connected to the signal edge generator.
A constituent unit for pulse shaping according to any one of 1 to 6 above. 5. Different supply voltage sources (5V-12V)
The pulse shaping component unit according to any one of claims 1 to 4, wherein the pulse shaping component unit is configured to be switchable.