Patent ID: 7362137
Filing Date: 2008-04-22
Classification: H03K

Abstract:
1. A voltage level shifter circuit for shifting a voltage level of a logic signal from a first voltage to a second voltage comprising: an input stage operating in a domain of a first voltage supply receiving an input signal; said input stage including a first inverter receiving said input signal and providing a first inverted signal; said input stage including a second inverter receiving an inverted input signal and providing a second inverted signal; said input stage including a first transistor coupled between the first voltage supply and the first inverter, said first transistor receiving a control input of the second inverted signal; said input stage including a second transistor coupled between the first voltage supply and the second inverter, said second transistor receiving a control input of the first inverted signal and an output voltage level shifting stage coupled to the input stage, said output voltage level shifting stage operating in a domain of a second voltage supply, and providing an output signal having a voltage level corresponding to said second voltage supply and a logic value corresponding to said input signal; said output voltage level shifting stage including a first inverter, said first inverter of said output voltage level shifting stage being coupled between the second voltage supply and ground, and said second inverted signal being applied to said first inverter of said output voltage level shifting stage.