| 摘要 |
An amplifier circuit is used for amplifying the signals of a signal source with a finite internal resistance (Rs), particularly of a speed sensor of an antiblocking system of a motor vehicle. The amplifier circuit has a comparator with hysteresis, the operating voltage (Uo) of which is much greater than the signal amplitude of the interference voltages which occur during operational disturbances, particularly with a line break between sensor and amplifier circuit. The amplifier has an operational amplifier (13) with positive and negative feedback, which positive and negative feedback are dimensioned in such a manner that a hysteresis of the order of magnitude of the operating voltage (Uo) occurs with a high effective internal resistance of the signal source, that is to say particularly in the case of a break in the connecting line (Figure 1). <IMAGE> |
