Reference voltage circuit compensated for temprature non-linearity

1 . A reference voltage circuit comprising:

first, second and third current-to-voltage converters, a preset voltage of the third current-to-voltage converter being output as a reference voltage;

a current mirror circuit that supplies currents to the first, second and third current-to-voltage converters; and

a control circuit that performs control so that a preset output voltage of the first current-to-voltage converter will be equal to a preset output voltage of the second current-to-voltage converter;

wherein the first current-to-voltage converter includes a diode and a resistor connected in parallel with the diode;

the second current-to-voltage converter includes a plurality of diodes connected in parallel with one another, a first resistor connected in parallel with the diodes, a second resistor connected in series with the parallel circuit composed of the diodes and the first resistor, and a third resistor connected in parallel with a series circuit of the parallel circuit and the second resistor; and

the third current-to-voltage converter includes a resistor.

2 . A reference voltage circuit comprising:

first, second and third current-to-voltage converters, a preset voltage of the third current-to-voltage converter being output as a reference voltage;

a current mirror circuit that supplies currents to the first, second and third current-to-voltage converters; and

a control circuit that performs control so that a preset intermediate terminal voltage of the first current-to-voltage converter will be equal to a preset intermediate terminal voltage of the second current-to-voltage converter;

wherein the first current-to-voltage converter includes a diode, a first resistor connected in parallel with the diode, a second resistor connected in series with the parallel circuit of the diode and the first resistor, and a third resistor connected in parallel with the series circuit of the parallel circuit and the second resistor, the intermediate terminal voltage of the first current-to-voltage converter being output at the parallel-connected third resistor;

the second current-to-voltage converter includes a plurality of parallel-connected diodes, a fourth resistor connected in parallel with the diodes, a fifth resistor connected in series with the parallel circuit of the diodes and the fourth resistor, and a sixth resistor connected in parallel with the series circuit of the parallel circuit and the fifth resistor, the intermediate terminal voltage of the second current-to-voltage converter being output at the parallel-connected sixth resistor; and

the third current-to-voltage converter including a resistor.

3 . A reference voltage circuit comprising:

first, second and third current-to-voltage converters, a preset voltage of the third current-to-voltage converter being output as a reference voltage;

a current mirror circuit that supplies currents to the first, second and third current-to-voltage converters; and

a control circuit that performs control so that a preset output voltage of the first current-to-voltage converter will be equal to a preset output voltage of the second current-to-voltage converter;

wherein the first current-to-voltage converter includes a diode;

the second current-to-voltage converter includes a plurality of parallel-connected diodes, a first resistor connected in parallel with the diodes, a second resistor connected in series with the parallel circuit of the diodes and the first resistor, and a third resistor connected in parallel with the series circuit of the parallel circuit and the second resistor; and

the third current-to-voltage converter includes a resistor.

4 . A reference voltage circuit comprising:

first, second and third current-to-voltage converters, a preset voltage of the third current-to-voltage converter being output as a reference voltage;

a current mirror circuit that supplies currents to the first, second and third current-to-voltage converters; and

a control circuit that performs control so that a preset intermediate terminal voltage of the first current-to-voltage converter will be equal to a preset intermediate terminal voltage of the second current-to-voltage converter;

wherein the first current-to-voltage converter includes a diode;

the second current-to-voltage converter includes a plurality of parallel-connected diodes, a first resistor connected in parallel with the diodes, a second resistor connected in series with the parallel circuit of the diodes and the first resistor, and a third resistor connected in parallel with the series circuit of the parallel circuit and the second resistor, the intermediate terminal voltage of the second current-to-voltage converter being output at the parallel connected resistor; and

the third current-to-voltage converter includes a resistor.

5 . The reference voltage circuit according to claim 1 , wherein the control circuit includes an operational amplifier having an inverting input terminal and a non-inverting input terminal respectively supplied with a voltage from the first current-to-voltage converter and a voltage from the second current-to-voltage converter, and having an output terminal connected to coupled gates of the current mirror circuit.

6 . The reference voltage circuit according to claim 1 , wherein the control circuit includes another current mirror circuit arranged between the current mirror circuit and the current-to-voltage converter.

7 . The reference voltage circuit according to claim 1 , wherein the diode is composed of a diode connected bipolar junction transistor.

8 . A reference voltage circuit comprising:

a non-linear current mirror circuit that includes first and second bipolar transistors;

a third bipolar transistor connected to an output of the non-linear current mirror circuit;

an output resistor, a preset terminal voltage of the output resistor being output as a reference voltage;

a linear current mirror circuit that supplies currents to the non-linear current mirror circuit, the third bipolar transistor and the output resistor; and

an operational amplifier that controls an input terminal voltage and an output terminal voltage of the non-linear current mirror circuit to be equal to each other.

9 . A reference voltage circuit comprising:

a non-linear current mirror circuit that includes first and second bipolar transistors;

an output resistor, a preset terminal voltage of the output resistor being output as a reference voltage;

a linear current mirror circuit that supplies currents to the non-linear current mirror circuit and the output resistor; and

an operational amplifier that controls an input terminal voltage and an output terminal voltage of the non-linear current mirror circuit to be equal to each other.

10 . A reference voltage circuit comprising:

a non-linear current mirror circuit that includes first and second bipolar transistors;

a third bipolar transistor connected to an output of the non-linear current mirror circuit;

an output resistor, a preset terminal voltage of the output resistor being output as a reference voltage; and

a linear current mirror circuit that supplies currents to the non-linear current mirror circuit and the output resistor, the linear current mirror circuit being driven by an output of the third bipolar transistor.

11 . A reference voltage circuit comprising:

a non-linear current mirror circuit that includes first and second bipolar transistors;

an output resistor, a preset terminal voltage of the output resistor being output as a reference voltage; and

a linear current mirror circuit that supplies currents to the non-linear current mirror circuit and the output resistor, the linear current mirror circuit being self-biased by being driven by an output current of the non-linear current mirror circuit.

12 . A reference voltage circuit comprising:

a non-linear current mirror circuit that includes first and second bipolar transistors;

an output resistor, a preset terminal voltage of the output resistor being output a reference voltage; and

a linear current mirror circuit that supplies a current to the non-linear current mirror circuit, the linear current mirror circuit being self-biased by being driven by an output current of the non-linear current mirror circuit, and the linear current mirror circuit being grounded via the output resistor.

13 . A reference voltage circuit comprising:

first, second and third current-to-voltage converters;

a current mirror circuit that supplies currents to the first and second current-to-voltage converters; and

a control circuit that performs control so that a preset output voltage of the first current-to-voltage converter will be equal to a preset output voltage of the second current-to-voltage converter;

wherein a terminal voltage of the third current-to-voltage converter, connected in series with the first and second current-to-voltage converters and grounded, is output as a reference voltage;

the first current-to-voltage converter includes a diode or a combination of a diode and a resistor;

the second current-to-voltage converter includes a combination of a parallel connection of a plurality of diodes and a resistor; and

the third current-to-voltage converter includes a resistor.

14 . A reference voltage circuit comprising:

first, second and third current-to-voltage converters;

a first current mirror circuit that supplies currents to the first and second current-to-voltage converters; and

a second current mirror circuit that self-biases the first current mirror circuit;

wherein a terminal voltage of the third current-to-voltage converter, connected in series with the first and second current-to-voltage converters and grounded, is output as a reference voltage;

the first current-to-voltage converter includes a diode or a combination of a diode and a resistor;

the second current-to-voltage converter includes a combination of a parallel connection of a plurality of diodes and a resistor; and

the third current-to-voltage converter includes a resistor.

15 . A reference voltage circuit comprising:

first to fifth current-to-voltage converters;

first and second transistors that respectively supplies currents to the first and second current-to-voltage converters, the first and second transistors having gates connected together to form a first current mirror circuit;

a second current mirror circuit that supplies a current flowing through the first transistor to the third transistor; and

a third current mirror circuit that supplies a current flowing through the second transistor to a fourth transistor;

wherein the third and fourth transistor respectively supply currents to the fourth and fifth current-to-voltage converters;

the third and fourth transistors have gates coupled together to form a fourth current mirror circuit;

the third transistor has a drain connected to the coupled gates of the first and second transistors,

a terminal voltage of the third current-to-voltage converter, connected in series with the first, second, fourth and fifth current-to-voltage converters and grounded, being output as a reference voltage;

the first current-to-voltage converter includes a diode or a combination of a diode and a resistor,

the second current-to-voltage converter includes a combination of a parallel connection of a plurality of diodes and a resistor, and

the third current-to-voltage converter includes a resistor;

the fourth and fifth current-to-voltage converters being of the same configuration as the first current-to-voltage converter.

16 . A reference voltage circuit comprising:

first to fourth current-to-voltage converters;

first to third transistors, respectively supplying currents to the first to third current-to-voltage converters, the first to third transistors having gates connected together to form a first current mirror circuit;

a second current mirror circuit that self-biases the first and second transistors; and

a fourth transistor controlled by an output signal of the second current mirror circuit and connected in cascode to the third transistor;

wherein the second current mirror circuit includes a non-linear current mirror circuit (reverse Widlar current mirror circuit);

a terminal voltage of the third current-to-voltage converter, connected in series with the first, second and fourth current-to-voltage converters and grounded, is output as a reference voltage;

the first current-to-voltage converter includes a diode or a combination of a diode and/or a resistor;

the second current-to-voltage converter includes a combination of a plurality of parallel-connected diodes and a resistor;

the third current-to-voltage converter includes a resistor;

the fourth current-to-voltage converter is of the same configuration as the first current-to-voltage converter.

17 . A reference voltage circuit comprising:

a non-linear current mirror circuit that includes first and second bipolar transistors;

a third bipolar transistor connected to an output of the non-linear current mirror circuit;

an operational amplifier having an inverting input terminal and a non-inverting input terminal, respectively connected to an input terminal and an output terminal of the non-linear current mirror circuit;

an output resistor, a preset terminal voltage of the output resistor being output as a reference voltage; and

a linear current mirror circuit that supplies the current to the non-linear current mirror circuit;

wherein the linear current mirror circuit is self-biased by being driven by an output current of the non-linear current mirror circuit;

the operational amplifier controls the linear current mirror circuit by an output thereof and operating so that an input terminal voltage and an output terminal voltage of the non-linear current mirror circuit will be equal to each other;

the current flowing through the non-linear current mirror circuit and the current flowing through the third bipolar transistor flowing through the output resistor.

18 . A reference voltage circuit comprising:

a non-linear current mirror circuit that includes first and second bipolar transistors;

a third bipolar transistor connected to an output of the non-linear current mirror circuit;

an output resistor, a preset terminal voltage of the output resistor being output as a reference voltage; and

a linear current mirror circuit that supplies to the non-linear current mirror circuit a current proportionate or equal to the current flowing through the third bipolar transistor, the linear current mirror circuit being self-biased by being driven by an output current of the non-linear current mirror circuit;

the current flowing through the non-linear current mirror circuit and the current flowing through the third bipolar transistor flowing through the output resistor.

19 . A reference voltage circuit comprising:

first and second bipolar transistors having an emitter area ratio of 1:N, where N>0, have bases connected together to form an output terminal,

the second bipolar transistor having a base and a collector connected together;

a first resistor connected between the base and an emitter of the second bipolar transistor; and

a second resistor connected between an emitter of the first bipolar transistor and the emitter of the second bipolar transistor;

wherein the first bipolar transistor has the emitter grounded via a third resistor; and

the first and second bipolar transistors are self-biased by a current mirror circuit.

20 . A reference voltage circuit comprising:

a first diode;

second diodes made up of a plurality of parallel-connected diodes;

a first resistor connected in parallel with the second diodes;

a second resistor connected in series with the second diodes and the first resistor;

an output circuit made up of a series connection of a third resistor and a third diode, a preset terminal voltage of the output circuit being output as a reference voltage;

a linear current mirror circuit that supplies currents to the first diode, the second diodes, the first and second resistors and the output circuit; and

an operational amplifier, as control means, exercising control so that the terminal voltage of the first diode and the terminal voltage of the second diodes and the first and second resistors will be equal to each other.

21 . A reference voltage circuit comprising:

a first diode;

second diodes made up of a plurality of parallel-connected diodes;

a first resistor connected in parallel with the second diodes;

a second resistor connected in series with the second diodes and the first resistor;

an output circuit made up of a series connection of a third resistor and a third diode and a fourth resistor connected in parallel with the series connection, a preset terminal voltage of the output circuit being output as a reference voltage;

a linear current mirror circuit that supplies currents to the first diode, the second diodes, the first and second resistors and the output circuit; and

an operational amplifier, as control means, exercising control so that a terminal voltage of the first diode and a terminal voltage of the second diodes and the first and second resistors will be equal to each other.

22 . A reference voltage circuit comprising:

a first diode;

second diodes made up of a plurality of parallel-connected diodes;

a first resistor connected in parallel with the second diodes;

a second resistor connected in series with the second diodes and the first resistor;

a third resistor connected in series with the first diode;

a fourth resistor connected in series with the second diodes and the first and second resistors; and

an operational amplifier, as control means, having an output connected to the third and fourth resistors, the operational amplifier exercising control so that a terminal voltage of the first diode will be equal to a terminal voltage of the second diodes and the first and second resistors, an output voltage of the operational amplifier being output as a reference voltage.

23 . A reference voltage circuit comprising:

first and second bipolar transistors having an emitter area ratio of 1:N, where N>0;

first and second resistors connected between an emitter of the first bipolar transistor and the ground

a third resistor connected between a base and an emitter of the second bipolar transistor; and

a current mirror circuit;

wherein the first and second bipolar transistor have emitters connected together and are driven by a constant current source;

a voltage across the emitter of the first bipolar transistor and the ground, divided by the first and second resistors, is applied to the base of the first bipolar transistor;

the second bipolar transistor has a base and a collector thereof connected together to form an output terminal; and

the first and second bipolar transistors are self-biased by the current mirror circuit.

24 . A reference voltage circuit comprising:

a first diode;

a diode set made up of a plurality of parallel-connected second diodes;

a first resistor connected in parallel with the diode set;

a second resistor connected in series with a parallel connection of the diode set and the first resistor;

a third resistor connected in series with the first diode;

a fourth resistor connected in series with the serial connection of the second resistor and the parallel connection of the diode set and the first resistor;

a current mirror circuit that supplies the current to the third and fourth resistors; and

an operational amplifier, as control means, having an output connected to commonly coupled bases of two transistors that forms a current mirror circuit,

the operational amplifier exercising control so that the terminal voltage of the first diode will be equal to the voltage at a connection node of the second and third resistors; and

a terminal voltage at the third resistor and/or a terminal voltage of the fourth resistor is a reference voltage.

25 . A reference voltage circuit comprising:

a first bipolar transistor, formed as a unit transistor, and having an emitter grounded; and

a second bipolar transistor, having an emitter area N times that of the unit transistor, are connected in cascode;

the second bipolar transistor has a base and a collector connected in common and connected to a constant current source;

the first bipolar transistor has a base connected to a connection terminal of first and second resistors connected in series between the constant current source and the ground;

an emitter of the second bipolar transistor operates as an output terminal for a reference voltage; and

a third resistor is connected between the base and the emitter of the second bipolar transistor.

26 . A reference voltage circuit comprising:

first, second and third current-to-voltage converters;

a current mirror circuit that supplies currents to the first, second and third current-to-voltage converters; and

a circuit that exercises control so that a preset output voltage of the first current-to-voltage converter will be equal to a preset intermediate terminal voltage of the second current-to-voltage converter;

wherein a preset voltage of the third current-to-voltage converter is output as a reference voltage;

the first current-to-voltage converter includes:

a first diode; and

a resistor connected in parallel with the first diode;

the second current-to-voltage converter includes:

a diode set made up of a plurality of parallel-connected diodes;

a second resistor connected in parallel with the diode set;

a third resistor connected in series with a parallel connection of the diode set and the second resistor; and

a fourth resistor connected in parallel with the series connection of the parallel connection and the third resistor; and

the preset intermediate terminal voltage of the second current-to-voltage converter is output from the parallel-connected resistor; and

the third current-to-voltage converter including a resistor.

27 . A reference voltage circuit comprising:

first, second and third current-to-voltage converters;

a current mirror circuit that supplies currents to the first, second and third current-to-voltage converters; and

a circuit that exercises control so that a preset intermediate terminal voltage of the first current-to-voltage converter will be equal to a preset intermediate terminal voltage of the second current-to-voltage converter,

a preset voltage of the third current-to-voltage converter being output as a reference voltage; wherein

the first current-to-voltage converter includes a first diode; and

a resistor connected in parallel with the first diode;

wherein the preset intermediate terminal voltage of the first current-to-voltage converter is output from the parallel-connected resistor;

the second current-to-voltage converter includes:

a diode set made up of a plurality of parallel-connected diodes;

a first resistor connected in parallel with the diode set;

a second resistor connected in series with a parallel connection of the diode set and the first resistor; and

a third resistor connected in parallel with the parallel connection and the first resistor;

the preset intermediate terminal voltage of the second current-to-voltage converter is output from the resistor connected in parallel; and

the third current-to-voltage converter including a resistor.