| 摘要 |
<p>This circuit allows the introduction of reference data in digital systems wherein a series of digital values is compared to the reference data in order to obtain switching signals for the digital system. It comprises a block (1) which has a digital/analog converter (5) receiving the series of digital values and controlled by an internal electric reference magnitude, preferably a reference voltage (UR). The reference data are derived, as analog values, from the reference values, in switching means (2), appropriately by voltage division. The reference data thus obtained are then compared to the analog output of the converter by comparators (Ko, K1, K2, Kn) provided in the block (1). Owing to the use of the same reference values for the output analog signal of the converter (5) and to the production of the reference data, there is provided a detection of disturbance phenomena, such as the drift and similar. The circuit according to the invention is particularly appropriate for setting switching signals in digital ignition systems for combustion machines.</p> |
