Method and circuit configuration for transmitting a two-valued signal
View Patent ↗The present invention relates to a method for transmitting a two-valued signal via a channel, a pulse train being output after the change of a signal level of the two-valued signal, and subsequently to the pulse train, a backswing is output. The present invention also relates to a circuit configuration for transmitting a two-valued signal having a magnetically coupled coil pair which includes an input coil and an output coil, at least two driver stages which are each connected to a terminal of the input coil, and an evaluation circuit which is connected to the terminals of the output coil, a capacitance being provided between a driver stage and a terminal of the input stage, and the input coil and the output coil each include two coil sections having windings in the opposite direction, the coil sections having the same winding direction of the input coil and the output coil being magnetically coupled.
1. A method for transmitting a two-valued signal via a channel, the method comprising:
generating a pulse train after a change of a signal level of the two-valued signal, the pulse train comprising at least a first pulse and an immediately following second pulse, wherein the second pulse is a same polarity as the first pulse and is generated before the first pulse fully decays, and
generating, subsequent to the pulse train, a backswing.
2. The method as recited in claim 1 , wherein pulses of the pulse train are output directly on top of each other.
3. The method as recited in claim 1 , wherein the two-valued signal is transmitted via a potential barrier.
4. The method as recited in claim 3 , wherein the potential barrier includes a magnetically coupled coil pair which has a capacitance preconnected to it on the input side.
5. The method as recited in claim 4 , wherein for the generation of a pulse train, at least two driver stages, which are provided on the input side of coil pair, switch in such a way that at each switching procedure a current change of the same direction is generated by the capacitance, each current change generating a pulse of the pulse train in an output coil of the coil pair.
6. The method as recited in claim 5 , wherein, in an initial state, a first driver stage outputs a first voltage value and a second driver stage outputs a second voltage value that is different from the first voltage value; after a change in the signal level the second driver stage outputs the first voltage value; and after a specified point in time, the first driver stage outputs the second voltage level.
7. The method as recited in claim 6 , wherein, in the case of an increasing slope of the two-valued signal, the first voltage value is higher than the second voltage value, and in the case of a decreasing slope of the two-valued signal, the first voltage value is lower than the second voltage value.
8. The method as recited in claim 5 , wherein, in an initial state, a first driver stage outputs a first voltage value and a second driver stage outputs a second voltage value that is different from the first voltage value; after a change in the signal level, the second driver stage outputs a third voltage value that is different from the first and the second voltage value; after a specified time duration, the first driver stage outputs the third voltage value; after an additional specified time duration, the second driver stage outputs the first voltage level; and after a specified time duration, the first driver stage outputs the second voltage value.
9. The method as recited in claim 8 , wherein, in the case of an increasing slope of the two-valued signal, the first voltage value is greater than the third voltage value and the third voltage value is greater than the second voltage value; and in the case of a declining slope of the two-valued signal, the first voltage value is lower than the third voltage value and the third voltage value is lower than the second voltage value.
10. The method as recited in one of the preceding claims, wherein using an evaluation circuit, the potentials of the terminals of the output coil of the coil pair are in each case compared to a reference potential while generating one evaluation signal for each.
11. The method as recited in claim 10 , wherein a valid signal transmission is detected in the case of evaluation signals that are in the opposite direction.
12. The method as recited in claim 11 , wherein a memory stage is set or reset as a function of the evaluation signals.
13. The method as recited in claim 10 , wherein the reference potential is formed by the average of the potentials of the terminals of the output coil.
14. The method as recited in claim 13 , wherein the reference potential is monitored for exceeding and/or undershooting specified threshold values, the processing of the potentials of the terminals of the output coil of the coil pair being interrupted in response to an exceeding and/or an undershooting.
15. The method as recited in claim 10 , wherein the evaluation signals are filtered using a filter for suppressing pulses of a specified low duration.