| 摘要 |
In order to set the circuit to be tested to a test mode, at least one output is led out by an output stage, and the input and output of the output stage internally leads to an exclusive-OR gate. As long as the output has a comparatively high-ohmic termination, as is the case during the normal mode of operation, the exclusive-OR gate will carry the same signal for both signal conditions of the output. For the purpose of testing a complementary pulse pattern is applied to the output, so that the exclusive-OR gate supplies an opposite signal, which establishes the test mode. The output of the exclusive-OR gate may lead to a bistable multivibrator, so that for establishing the test mode only a single complementary signal is required.
|
