Voltage reference circuit compensated for non-linearity in temperature characteristic of diode

A reference current circuit comprising:

• a first reference current circuit including:
• first and second current-to-voltage converting circuits, each of which receives a current and converts the current to a voltage to output the so converted voltage from a terminal thereof;
• first to fourth transistors constituting a first current mirror circuit and having first terminals connected in common to a first power supply and control terminals coupled together;
• and
• a first differential amplifying circuit having first and second input terminals, which form differential inputs, connected respectively to a connection node of the terminal of said first current-to-voltage converting circuit and a second terminal of said first transistor, and to a connection node of the terminal of said second current-to-voltage converting circuit and a second terminal of said second transistor, and further having an output terminal connected to the coupled control terminals of said first to fourth transistors;
• a second reference current circuit including:
• third and fourth current-to-voltage converting circuits, each of which receives a current and converts the current to a voltage to output the so converted voltage from a terminal thereof;
• fifth to seventh transistors constituting a second current mirror circuit and having first terminals connected in common to the first power supply and control terminals coupled together;
• and
• a second differential amplifying circuit having first and second input terminals, which form differential inputs, connected respectively to a connection node of the terminal of said third current-to-voltage converting circuit and a second terminal of said fifth transistor, and to a connection node of the terminal of said fourth current-to-voltage converting circuit and a second terminal of said sixth transistor, and further having an output terminal connected to the coupled control terminals of said fifth to seventh transistors;
• wherein a second terminal of said third transistor is connected to a common connection node of the terminal of said fourth current-to-voltage converting circuit, the second terminal of said sixth transistor and the second input terminal of said second differential amplifying circuit;
• a second terminal of said fourth transistor is connected to a common connection node of the terminal of said third current-to-voltage converting circuit, the second terminal of said fifth transistor and the first input terminal of said second differential amplifying circuit;
• each of said first and third current-to-voltage converting circuits comprises a diode having one end connected to a second power supply and having the other end connected to the terminal of each of said first and third current-to-voltage converting circuits;
• each of said second and fourth current-to-voltage converting circuits comprises:
• a series circuit, which has one diode with one end thereof connected to the second power supply or a plurality of parallel-connected diodes with one ends thereof connected to the second power supply, and a resistor;
• and a separate resistor connected in parallel with the series circuit;
• said resistor and said separate resistor being connected in common to the terminal of each of said second and fourth current-to-voltage converting circuits;
• and
• a fifth current-to-voltage converting circuit including a resistor having one end connected to a second terminal of said seventh transistor and another end connected to the second power supply.

A voltage reference circuit comprising:

• a first reference current circuit including:
• first and second current-to-voltage converting circuits, each of which receives a current and converts the current to a voltage to output the so converted voltage from a terminal thereof;
• first to third transistors constituting a first current mirror circuit and having first terminals connected in common to a first power supply and control terminals coupled together;
• and
• a first differential amplifying circuit having first and second input terminals, which form differential inputs, connected respectively to a connection node of the terminal of said first current-to-voltage converting circuit and a second terminal of said first transistor, and to a connection node of the terminal said second current-to-voltage converting circuit and a second terminal of said second transistor, and further having an output terminal connected to the coupled control terminals of said first to third transistors;
• a second reference current circuit including:
• a third current-to-voltage converting circuit that receives a current and converts the current to a voltage to output the so converted voltage from a terminal thereof;
• fourth and fifth transistors constituting a second current mirror circuit and having first terminals connected in common to the first power supply and control terminals coupled together;
• and
• a second differential amplifying circuit having first and second input terminals, which form differential inputs, connected respectively to a connection node of the terminal of said first current-to-voltage converting circuit and a second terminal of said first transistor, and to a connection node of the terminal of said third current-to-voltage converting circuit and a second terminal of said fourth transistor, and further having an output connected to the coupled control terminals of said fourth and fifth transistors;
• wherein a second terminal of said third transistor is connected to a common connection node of the terminal of said third current-to-voltage converting circuit, the second terminal of said fourth transistor and the second input terminal of said second differential amplifying circuit;
• said first current-to-voltage converting circuit comprising a diode having one end connected to a second power supply and the other end connected to the terminal of said first current-to-voltage converting circuit;
• each of said second and third current-to-voltage converting circuits comprises:
• a series circuit, which has one diode with one end thereof connected to the second power supply or a plurality of parallel-connected diodes with one ends thereof connected to the second power supply, and a resistor;
• and a separate resistor connected in parallel with the series circuit;
• said resistor and said separate resistor being connected in common to the terminal of each of said second and third current-to-voltage converting circuits;
• and
• a fourth current-to-voltage converting circuit including a resistor having one end connected to a second terminal of said fifth transistor and another end connected to the second power supply.