| 摘要 |
<p>A circuit configuration for obtaining a binary output signal from a current signal delivered by a magnetic-field sensor comprises a magnetic-field sensor (1), which is supplied at two terminals (2; 3) with a supply voltage and which delivers from these terminals (2; 3) a current signal essentially alternating in pulse shape between two current values, a voltage-supply unit (50) to supply the magnetic-field sensor (1) with a stabilized supply voltage, a measuring device (51) for tapping the pulse-shaped current signal from the magnetic-field sensor (1) and for delivering a measuring signal, a signal-conditioning stage (52) for forming an analogue voltage signal from the measuring signal, an analogue/digital converter stage (6) for obtaining a digital voltage signal from the analogue voltage signal, a control stage (7) for obtaining a first and a second signal value from the digital voltage signal, wherein the signal values represent the two current values of the current signal, alternating in pulse shape, as supplied by the magnetic-field sensor (1), for supplying the currently obtained first and second signal values to a memory device (8) after every pulse- shaped change in the current signal and for identifying a digital changeover-threshold signal in accordance with a first algorithm from the real-time first and second signal values, the memory device (8) for storing the currently obtained first and second signal values, a digital/analogue converter stage (9) for obtaining an analogue changeover-threshold signal from the digital changeover-threshold signal and a comparator (10) for comparing the analogue voltage signal with the analogue changeover-threshold signal and for creating the binary output signal in accordance with this comparison.</p> |
