| 摘要 |
A driving stage of a signal transmitting system includes: a driver powered by a first supply source and arranged to output a driving signal via an output port capable of being connected to an external device; and a controllable isolating circuit including: a switching circuit arranged to selectively couple the first supply source to the output port, and a detecting circuit arranged to detect a specific signal derived from the signal transmitting system, wherein when the specific signal indicates the signal transmitting system turns into a power-off state, the detecting circuit controls the switching circuit to disconnect the output port from the first supply source.
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