Reference voltage generation circuit providing a stable output voltage

A reference voltage generation circuit comprising:

• a first current mirror including first through third transistors of a first conductivity type, said first through third transistors having sources connected together and implementing a first output side, a reference side and a second output side, respectively, of said first current mirror;
• a second current mirror including fourth and fifth transistor of a second conductivity type opposite to said first conductivity type, said fourth and fifth transistors implementing a reference side and an output side, respectively, of said second current mirror, said fourth and fifth transistors being connected in series with said first and second transistors, respectively;
• first and second current sources connected in series with said second and fifth transistors and with said third transistor, respectively, for defining current flowing therethrough;
• and
• a voltage control block for controlling source-to-drain voltage of said first through third transistors within a specified range,
• the voltage control block comprising a sixth transistor of said second conductivity type having a source connected to a voltage source, a drain connected to the sources of said first through third transistors, and a gate fixed at a voltage corresponding to a sum of double the threshold voltages of said first through third transistors and a threshold voltage of said fourth and fifth transistors.

A reference voltage generation circuit comprising:

• a first current mirror including first through third transistors of a first conductivity type, said first through third transistors having sources connected together and implementing a first output side, a reference side and a second output side, respectively, of said first current mirror;
• a second current mirror including fourth and fifth transistor of a second conductivity type opposite to said first conductivity type, said fourth and fifth transistors implementing a reference side and an output side, respectively, of said second current mirror, said fourth and fifth transistors being connected in series with said first and second transistors, respectively;
• first and second current sources connected in series with said second and fifth transistors and with said third transistor, respectively, for defining current flowing therethrough;
• and
• a voltage control block for controlling source-to-drain voltage of said first through third transistors within a specified range,
• the voltage control block comprising:
• a sixth transistor of said second conductivity type having a source connected to a voltage source and a drain connected to the sources of said first through third transistors, and
• in series between said voltage source and ground, a resistor, a seventh transistor of said first conductivity type, an eighth transistor of said second conductivity type, and a ninth transistor of said first conductivity type, gates of said seventh, eighth and ninth transistors being connected to respective drains thereof, and a gate of said sixth transistor receiving a voltage from a node joining said resistor and said seventh transistor.