| 摘要 |
A level shifter is presented comprising an input branch and an output branch. The input branch comprises a first switch, a voltage clamping unit and a controllable current source in series. The output branch comprises a second switch and a third switch in series, the second switch and third switch having opposite polarities. An output is provided between the second and the third switch. The current source is controlled by an input signal and the output signal. The first switch is controlled by the input signal. Switching control terminals of the second and the third switch are connected on either side of the clamping unit. This reduces voltage swing of switching control units, thus resulting in fast switching, less power consumption and wider voltage ranges. The input branch draws a current only during level transitions, enabling fast switching and power saving in steady state of the level shifter. |
