| 摘要 |
A differential signal detector circuit having a differential signal detector for detecting a differential signal to provide a detecting signal and a comparing detector having a timer with a time constant for comparing the detecting signal with a base point signal and providing a differential signal detection signal when the detected differential signal differs sufficiently from a base point signal is improved by providing a floating base point signal. For this, the circuit additionally has a floating base point loop for providing the floating base point signal, a wave form cuttoff loop for cutting off the affect of the floating base point loop, and a voltage balance loop for avoiding directional impedance differences. As a result, the differential signal detector circuit produces the detection signal only when the differential signal exceeds the floating base point signal sufficiently for a sufficient time.
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