| 摘要 |
PURPOSE:To prevent delay in the switching speed time even when noise is impressed to an output terminal by connecting a Schottky diode between a collector and the output terminal of other transistor (TR) operated in response to the operating state of a TR. CONSTITUTION:The Schottky barrier diode 14 blocks a current flowing from the collector of a TR 4 to an output terminal 5 because the potential at the output terminal 5 is lower than a low potential point potential due to the effect of noise. Thus, the nonconductive state of the TR 4 due to the potential drop at the outputer terminal 5 is eliminated and the conductive/nonconductive state of a TR 1 depends on a signal potential and a sum of base-emitter voltages of TRs 1, 4a with respect to a potential of the point 6. Even when the potential at the output terminal 5 is lower than the potential at a low potential point 6 when the signal changes from H to L, the TR 1 changes quickly from the conductive into the nonconductive state so as to eliminate the delay in the switching speed time as the circuit.
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