| 摘要 |
PURPOSE:To realize a high-speed operation of a switching circuit without addition of an external power supply, by deciding the load characteristics between the input and output signals of a switching element by the 1st FET and then controlling by the 2nd FET the level of the output signal of another logic at the power supply side and in a nonconduction mode of the switching element. CONSTITUTION:A switching element FETQS is connected between an output terminal 10 of a switching circuit and a common power supply GND. Then a series circuit of the 1st FETQL functioning as a load element and the 2nd FETQE for control of voltage is connected between the output terminal 10 of the FETQS and a power supply VDD. A logical output signal is delivered to the terminal 10 when the FETQS conducts by the current flowing via FETQL and QE. The load characteristics between the input and output signals of the FETQS of the switching circuit are decided by the FETQL. While, the FETQE controls the level of another logic at the VDD side when the FETQS is not conductive. This ensures a high-speed operation of the switching circuit without adding any external power supply. |
