Patent ID: 7368970
Filing Date: 2008-05-06
Classification: H03K

Abstract:
1. A level shifter circuit for converting both an input signal and a complementary input signal powered by a first power supply into an output signal powered by a second power supply, comprising: a level shifting unit, comprising: a first P-channel transistor having a first source connected to the second power supply and a first gate connected to the output node; a second P-channel transistor having a second source connected to the second power supply and a second gate connected to the complementary output node; a third P-channel transistor having a third source connected to the first drain of the first P-channel transistor, a third drain defined as the complementary output node and a third gate receiving the input signal; a fourth P-channel transistor having a fourth source connected to the second drain of the second P-channel transistor, a fourth drain defined as the output node and a fourth gate receiving the complementary input signal; a first N-channel transistor having a fifth drain connected to the complementary output node, a fifth gate receiving the input signal and a fifth source connected to the ground terminal; and a second N-channel transistor having a sixth drain connected to the output node, a sixth gate receiving the complementary input signal and a sixth source connected to the ground terminal; and a latch unit powered by the second power supply and connected to the output node, the complementary output node and a ground terminal;