Digital analog converter circuit and method for fault detection
A digital-analog converter circuit having a first subcircuit for converting a digital signal to an analog voltage, a second subcircuit for determining a first area in which the digital signal lies, a third subcircuit for determining a second area in which the analog voltage lies, and a fourth subcircuit for comparing the first and the second area. Also, a method for fault detection in a digital-analog converter circuit.
1. A digital-analog converter circuit comprising:
a first subcircuit for converting a digital signal to an analog voltage;
a second subcircuit for determining a first area in which the digital signal lies;
a third subcircuit for determining a second area in which the analog voltage lies;
a fourth subcircuit for comparing the first area and the second area; and
a fifth subcircuit for providing a fault signal with the aid of an output of the fourth subcircuit.
2. The digital-analog converter circuit according to claim 1 , wherein the fourth subcircuit and the fifth subcircuit are implemented in one subcircuit.
3. The digital-analog converter circuit according to claim 1 or 2 , wherein the third subcircuit includes at least one window comparator.
4. The digital-analog converter circuit according to claim 3 , wherein the third subcircuit includes a window comparator for the second area.
5. The digital-analog converter circuit according to claim 3 , wherein the third subcircuit includes a switchable window comparator.
6. The digital-analog converter circuit according to claim 3 , wherein the third subcircuit includes a window comparator for the second area, and wherein the fourth sub circuit includes at least one AND gate or a NAND gate.
7. The digital-analog converter circuit according to claim 3 , wherein the third subcircuit includes a switchable window comparator, and wherein the fourth subcircuit includes at least one AND gate or a NAND gate.
8. The digital-analog converter circuit according to any of claim 1 or 2 , wherein the fourth subcircuit includes at least one AND gate or a NAND gate.
9. The digital-analog converter circuit according to claim 1 , wherein at least one subcircuit includes a number of logic gates.
10. A method for fault detection in a digital-analog converter circuit, comprising:
converting a digital signal to an analog voltage;
determining a first area in which the digital signal lies;
determining a second area in which the analog voltage lies;
determining whether the first area corresponds to the second area; and
detecting a fault if the first area does not correspond to the second area.
11. The method according to claim 10 , wherein the fault detection is carried out at substantially the same time as the signal conversion.