| 摘要 |
<p>A level shifting circuit (500) is provided for shifting a first voltage level to a second voltage level. The level shift is done by two inverters (542, 543) connected in cascade. The input of the first inverter forms the input port (501) of the level shifting circuit (500) where the first voltage level is input. The output of the second inverter forms the output port (502) of the level shifting circuit (500) where the second voltage level is output. The level shifting circuit (500) is operated by a single operating voltage (VDD). It further comprises a leakage current limiting circuit (541) connected in series between the first inverter (542) and the operating voltage (VDD) to limit a leakage current through the logic level shifting circuit (500). The level shifting circuit (500) is particularly suited to use in shifting logical 1 levels in mobile telephones. <IMAGE></p> |
