Patent ID: 6011436
Filing Date: 2000-01-04
Classification: H03F

Abstract:
A voltage conversion circuit comprising:first and second MOS transistors of a first conductivity type which have sources commonly connected and grounded through a constant current source and substantially the same characteristics;a third MOS transistor of a second conductivity type which has a drain and gate connected to a drain of said first MOS transistor and a source connected to a power supply terminal;a fourth MOS transistor of the second conductivity type which has a drain and gate connected to a drain of said second MOS transistor, a source connected to said power supply terminal, and substantially the same characteristics as those of said third MOS transistor;a fifth MOS transistor of the first conductivity type which has a source connected to a reference power supply terminal and a gate connected to a drain thereof;a sixth MOS transistor of the first conductivity type which has a source connected to said reference power supply terminal, a gate connected to a drain thereof, and substantially the same characteristics as those of said fifth MOS transistor;a seventh MOS transistor of the second conductivity type which has a source connected to a power supply terminal, a drain connected to said drain of said fifth MOS transistor, and a gate connected to said gate of said third MOS transistor; andan eighth MOS transistor of the second conductivity type which has a source connected to said power supply terminal, a drain connected to said drain of said sixth MOS transistor, a gate connected to said gate of said fourth MOS transistor, and substantially the same characteristics as those of said seventh MOS transistor,wherein differential input voltages are applied to said gates of said first and second MOS transistors and differential voltages are output from said drains of said fifth and sixth MOS transistors.