Patent ID: 7474138
Filing Date: 2009-01-06
Classification: H03K

Abstract:
1. A level shift circuit comprising: first and second terminals that respectively receive an input signal and a complementary signal of said input signal having a first amplitude; third and fourth terminals that respectively output an output signal and a complementary signal of said output signal having a second amplitude, which is larger than said first amplitude; an output circuit comprising first and second transistors of a first polarity, respectively connected between a first power supply and said fourth terminal and between said first power supply and said third terminal, and third and fourth transistors of a second polarity, respectively connected between a second power supply and said fourth terminal and between said second power supply and said third terminal, having control ends connected to said third and fourth terminals, respectively; a first current control circuit that receives said input signal and the complementary signal of said output signal at said first terminal and said fourth terminal, respectively, that outputs first voltage signal to the control end of said first transistor according to values of said input signal and the complementary signal of said output signal, and that drive-controls a current flowing through said first transistor; and a second current control circuit that receives the complementary signal of said input signal and said output signal at said second terminal and said third terminal, respectively, that outputs second voltage signal to the control end of said second transistor according to values of the complementary signal of said input signal and said output signal, and that drive-controls a current flowing through said second transistor.