| 摘要 |
<p>1. Interface circuit for digital signals having an input (1, 1'), downstream of which a first inverter (2) is connected, having a first npn transistor (5), the base of which is connected to the output of the first inverter (2), the emitter of which is connected via a first resistance (7) to a first output terminal (8), and the collector of which is connected to a connection terminal (4) for a positive supply voltage, having a first pnp transistor (6), the base of which is connected to the base of the first npn transistor (5), the collector of which is connected to earth and the emitter of which is connected to the emitter of the first npn transistor (5), having a second inverter (3), the input of which is connected to the output of the first inverter (2), having a second npn transistor (9), the base of which is connected to the output of the second inverter (3), the emitter of which is connected via a second resistance (11) to the second output terminal (12) and the collector of which is connected to the connection terminal (4), and having a second pnp transistor (10), the base of which is connected to the base of the second npn transistor (9), the collector of which is connected to earth, and the emitter of which is connected to the emitter of the second npn transistor (9).</p> |
