| 摘要 |
<p>An output stage for an electronic sensor comprising two transistors (14, 16) connected in series to form a push/pull arrangement between a pair of current supply lines (31, 33), operating with a fixed supply voltage therebetween, and a sensor output line (34) connected to the junction of these two transistors (14, 16). Each transistor (14, 16) is adapted to be driven via a respective drive line (40, 42) from an amplified sensor input signal (I). A detecting means (A, B) detects an open circuit condition in either of the two supply lines (31, 33) and disables the signal drive to that one of the two transistors (14, 16) which is connected to the supply line, in a manner so as to prevent back feed from powering the sensor via the sensor output line (34).</p> |
