Temperature compensation circuit
First Claim
1. A temperature compensation circuit comprising:
- a first transistor having a control terminal supplied with a first signal;
a first resistor having a first end connected to an output of the first transistor;
a second transistor having a control terminal supplied with a second signal;
a second resistor having a first end connected to an output of the second transistor;
a third resistor having a first end connected to a first connection point to which a second end of the first resistor and a second end of the second resistor are commonly connected;
a constant voltage element connected to the third resistor;
a third transistor having a control terminal connected to the first end of the first resistor;
a fourth transistor having a control terminal connected to the first end of the second resistor;
a fifth transistor having a control terminal supplied with the first signal;
a first control circuit having a first input terminal connected to an output of the fifth transistor and supplied with a first current outputted from the fifth transistor, a second input terminal connected to a fourth resistor wherein a second current flows through the second input terminal, and an output terminal outputting a third current depending on a difference between a value of the first current and a value of the second current;
a sixth transistor having a control terminal supplied with the third current;
a seventh transistor having a control terminal which is connected to the control terminal of the sixth transistor, is supplied with the third current, and outputs a current depending on the third current to a second connection point to which the fourth and fifth transistors are commonly connected;
an eighth transistor having a control terminal connected to the control terminal of the sixth transistor;
a first mirror circuit connected to the eiqhth transistor; and
a second mirror circuit connected to the first mirror circuit.
1 Assignment
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Accused Products
Abstract
In one embodiment, a temperature compensation circuit includes a bias circuit configured to output a bias current having a current value increasing in proportion to an absolute temperature in a low-temperature region, and having a greater current value than the current value proportional to the absolute temperature in a high-temperature region, and a transistor which is supplied with the bias current. The bias circuit includes first to third transistors, a fourth transistor through which a first current flows, a fifth transistor, a sixth transistor through which a second current flows, and a control circuit having a connection terminal capable of being connected with an external resistor for adjusting a magnitude of the second current. The bias circuit generates a third current by adding the first current to the second current, and outputs the bias current that is the third current or a fourth current depending on the third current.
16 Citations
9 Claims
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1. A temperature compensation circuit comprising:
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a first transistor having a control terminal supplied with a first signal; a first resistor having a first end connected to an output of the first transistor; a second transistor having a control terminal supplied with a second signal; a second resistor having a first end connected to an output of the second transistor; a third resistor having a first end connected to a first connection point to which a second end of the first resistor and a second end of the second resistor are commonly connected; a constant voltage element connected to the third resistor; a third transistor having a control terminal connected to the first end of the first resistor; a fourth transistor having a control terminal connected to the first end of the second resistor; a fifth transistor having a control terminal supplied with the first signal; a first control circuit having a first input terminal connected to an output of the fifth transistor and supplied with a first current outputted from the fifth transistor, a second input terminal connected to a fourth resistor wherein a second current flows through the second input terminal, and an output terminal outputting a third current depending on a difference between a value of the first current and a value of the second current; a sixth transistor having a control terminal supplied with the third current; a seventh transistor having a control terminal which is connected to the control terminal of the sixth transistor, is supplied with the third current, and outputs a current depending on the third current to a second connection point to which the fourth and fifth transistors are commonly connected; an eighth transistor having a control terminal connected to the control terminal of the sixth transistor; a first mirror circuit connected to the eiqhth transistor; and a second mirror circuit connected to the first mirror circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification