| 摘要 |
A signal transmission circuit is provided, which includes a level shifting circuit performing level shifting on an input signal and then outputting the input signal, but which can inhibit the output of an erroneous signal caused by the voltage change of the power source. The level shifting circuit, for individually performing level shifting on a first input signal and a second input signal, and outputting the first input signal and the second input signal as a first shifted signal and a second shifted signal respectively, comprises a first series circuit having a switching element switched according to the first input signal and a resistor, a second series circuit having a switching element switched according to the second input signal and a resistor, and a counter-current preventing portion for preventing a reverse current from flowing from the ground terminal toward the first series circuit and the second series circuit.
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