US 2012/0056609 A1Published application

Reference current generation circuit

AssigneeKabushiki Kaisha Toshiba

InventorYuji Satoh

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Abstract

One embodiment provides a reference current generation circuit. The circuit has first and second reference current generation circuits for generating first and second reference currents respectively, and a current output circuit for outputting a third reference current by adding the first and second reference currents. The first reference current generation circuit includes first and second current-voltage conversion circuits and a first current supply circuit. The first current supply circuit provides substantially equal amounts of current to the first and second current-voltage conversion circuits respectively. The second reference current generation circuit includes third to fifth current-voltage conversion circuits and a second current supply circuit. The second current supply circuit provides a current to the fourth current-voltage conversion circuit, divide and provide amounts of current substantially equal to that of the current provided to the fourth current-voltage conversion circuit, to the third and fifth current-voltage conversion circuits respectively.

Claims20

Dependent claims

A reference current generation circuit, comprising first and second reference current generation circuits for generating first and second reference currents, respectively, and a current output circuit for outputting a third reference current by adding the first and second reference currents, the first reference current generation circuit including:

a first current-voltage conversion circuit provided with a first series circuit having a first resistor and a first diode, and a second resistor connected in parallel with the first series circuit;
a second current-voltage conversion circuit having a second diode;
and
a first current supply circuit to provide a substantially equal amount of current to the first and second current-voltage conversion circuits respectively,
the second reference current generation circuit including:
a third current-voltage conversion circuit provided with a second series circuit having a third resistor and a third diode;
a fourth current-voltage conversion circuit having a fourth diode;
a fifth current-voltage conversion circuit having a fourth resistor;
and
a second current supply circuit to provide a current to the fourth current-voltage conversion circuit, and to divide and provide an amount of current substantially equal to that of the current provided to the fourth current-voltage conversion circuit, to the third and fifth current-voltage conversion circuits respectively.

7 more elements

A reference current generation circuit, comprising a second reference current generation circuit for generating a second reference current, and a fourth series circuit, the fourth series circuit having a ninth insulated-gate field effect transistor of a first conduction channel and a load indicating a negative second-order temperature coefficient, the second reference current generation circuit including:

a third current-voltage conversion circuit provided with a second series circuit having a third resistor and a third diode;
a fourth current-voltage conversion circuit having a fourth diode;
a fifth current-voltage conversion circuit having a fourth resistor;
and
a second current supply circuit for providing a current to the fourth current-voltage conversion circuit, for providing an amount of current substantially equal to that of the current provided to the fourth current-voltage conversion circuit, to the fourth series circuit, and for dividing and providing an amount of current substantially equal to that of the current provided to the fourth current-voltage conversion circuit, to the third and fifth current-voltage conversion circuits respectively.

2 more elements

A reference current generation circuit, comprising:

a third current-voltage conversion circuit provided with a second series circuit having a third resistor and a third diode;
a fourth current-voltage conversion circuit having a fourth diode;
a fifth current-voltage conversion circuit having a fourth resistor;
and
a second current supply circuit for providing a current to the fourth current-voltage conversion circuit, and for dividing and providing an amount of current substantially equal to that of the current provided to the fourth current-voltage conversion circuit, to the third and fifth current-voltage conversion circuits respectively, wherein
a reference current has a positive second-order temperature coefficient is produced.

3 more elements

Dependencies are inferred from the claim text.