| 摘要 |
PURPOSE: A level shifter is provided to change input signals of different voltage levels to a signal of a constant voltage level. CONSTITUTION: The level shifter comprises: first and second level rising/falling circuits(42, 44) for receiving an input signal(XDI) and an inverted input signal(XDIB) respectively to output first and second output signals(DID, DIBU), wherein a high level of the input and inverted input signals(DID, DIBU) falls and a low level thereof rises; and a sense amplifier(46) for amplifying a level difference between the first and second output signals(DID, DIBU) from the first and second level rising/falling circuits(42, 44) to output a third output signal, wherein the first level rising/falling circuit(42) comprises a first portion for outputting the first output signal, wherein the voltage of the high level of the input signal is applied as a power supply voltage, the high level of the input signal falls and the low level thereof rises, and a second portion for outputting the first output signal, wherein the voltage of the high level of the third output signal is applied as a power supply voltage, the high level of the input signal falls and the low level thereof rises.
|
