Output circuit with increased output current

An output circuit, comprising:

• a constant voltage source;
• a first transistor of a first-conductivity type having a gate connected to said constant voltage source;
• a second transistor of a second-conductivity type having a source connected to a source of said first transistor and a gate connected to a circuit input terminal;
• a third transistor of the first-conductivity type having a drain connected to a circuit output terminal and a gate connected to the circuit input terminal;
• a current-current converter circuit having first and second current mirror circuits, the first current mirror circuit including fourth and fifth transistors, each of the fourth and the fifth transistors being of the first-conductivity type, a drain and a gate of the fourth transistor and a gate of the fifth transistor being connected to a drain of the second transistor, the second current mirror circuit including sixth and seventh transistors, each of the sixth and the seventh transistors being of the second-conductivity type, a drain and a gate of the sixth transistor and a gate of the seventh transistor being connected to a drain of the fifth transistor, a drain of the seventh transistor being connected to the circuit output terminal, said current-current converter circuit outputting a current proportional to a drain current of said second transistor to the circuit output terminal;
• and
• voltage supplying means for supplying an output voltage to and operating said first to third transistors and said current-current converter circuit,
• wherein the output current of said current-current converter circuit and a drain current of said third transistor in a steady state are determined according to an output voltage of the constant voltage source.