| 摘要 |
There is provided a signal output circuit capable of reducing the current consumption while assuring a base current of the output transistor of an NPN-type bipolar transistor. The signal output circuit (2) includes: an output transistor (10) of the NPN- type bipolar transistor; a ground side output control transistor (11) for turning the output transistor OFF when it is turned ON itself; a base current supply resistance element (12) for supplying current to the base of the output transistor (10); a power source side output control transistor (13) arranged between the base current supply resistance element (12) and the output transistor (10); a ground side current bypass transistor (14) which turns ON/OFF similarly as the ground side output control resistor (11) according to the input signal in such a manner that when it is ON, the current of the base current supply resistance element (12) flows in; and a current limit resistance element (15) arranged between the ground side current bypass transistor (14) and the base current supply resistance element (12).
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