| 摘要 |
PURPOSE: A logic level shifting circuit is provided, which does not need two supply voltages by using an input stage by making a lower supply voltage using a voltage generator, and prevents a constant current of an output stage by feeding back an output voltage. CONSTITUTION: An input voltage generator(40) drops a power supply voltage down to a constant level, and an input stage(50) switches the dropped power supply voltage and an output of a ground voltage by an input signal. And an output stage(60) switches the power supply voltage and the output of the ground voltage as an output of the input unit. The input voltage generator unit comprises source followers(40_1,40_2,...,40_n) constituted with cascaded NMOS transistors and a directional switching element(41) constituted with a NMOS transistor connected with the source follower in serial.
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