US 12,761,683 B2Granted

Current compensation circuit and semiconductor device

AssigneeAblic Inc.

InventorNaohiro Hiraoka

Life of this patent

Estimating the term…

Loading patent…

Abstract

A current compensation circuit includes: a second bipolar transistor configured to have a same process variation as the first bipolar transistor; a first transistor including a drain connected to the emitter of the second bipolar transistor; a second transistor including a gate connected to a gate of the first transistor, and a drain connected to its own gate; a third transistor including a drain connected to the emitter of the first bipolar transistor, and a gate connected to the drain of the second transistor and each gate of the first and the second transistors; a constant current source; a fourth transistor including a drain connected to the base of the second bipolar transistor, and a gate connected to its own drain; and a fifth transistor including a drain connected to one end of the constant current source, and a gate connected to the gate of the fourth transistor.

Claims16

Dependent claims

A current compensation circuit configured to supply current to an emitter of a first bipolar transistor including a collector connected to a first power terminal, a base connected to the first power terminal, and the emitter, the current compensation circuit comprising:

a second bipolar transistor including a collector connected to the first power terminal, a base, and an emitter, the second bipolar transistor being configured to have a same process variation as the first bipolar transistor;
a first transistor including a drain connected to the emitter of the second bipolar transistor, a gate, and a source connected to a second power terminal;
a second transistor including a gate connected to the gate of the first transistor, a drain connected to the gate of the second transistor, and a source connected to the second power terminal;
a third transistor including a drain connected to the emitter of the first bipolar transistor, a gate connected to a connection point of the drain of the second transistor, the gate of the second transistor, and the gate of the first transistor, and a source connected to the second power terminal;
a constant current source including a first end connected to the connection point and a second end connected to the first power terminal;
a fourth transistor including a drain connected to the base of the second bipolar transistor, a source connected to the first power terminal, and a gate connected to the drain of the fourth transistor;
and
a fifth transistor including a drain connected to the first end of the constant current source, a gate connected to the gate of the fourth transistor, and a source connected to the first power terminal.

5 more elements

A semiconductor device including an integrated circuit formed on a semiconductor substrate, the integrated circuit comprising:

a first bipolar transistor including a collector connected to a first power terminal, a base connected to the first power terminal, and an emitter;
and
a current compensation circuit supplying current to the emitter of the first bipolar transistor, the current compensation circuit comprising:
a second bipolar transistor including a collector connected to the first power terminal, a base, and an emitter, the second bipolar transistor being configured to have a same process variation as the first bipolar transistor;
a first transistor including a drain connected to the emitter of the second bipolar transistor, a gate, and a source connected to a second power terminal;
a second transistor including a gate connected to the gate of the first transistor, a drain connected to the gate of the second transistor, and a source connected to the second power terminal;
a third transistor including a drain connected to the emitter of the first bipolar transistor, a gate connected to a connection point of the drain of the second transistor, the gate of the second transistor, and the gate of the first transistor, and a source connected to the second power terminal;
a constant current source including a first end connected to the connection point and a second end connected to the first power terminal;
a fourth transistor including a drain connected to the base of the second bipolar transistor, a source connected to the first power terminal, and a gate connected to the drain of the fourth transistor;
and
a fifth transistor including a drain connected to the first end of the constant current source, a gate connected to the gate of the fourth transistor, and a source connected to the first power terminal.

8 more elements

Dependencies are inferred from the claim text.