Temperature compensation circuit
AssigneeDenso Corporation
InventorHiroshi Okada
Life of this patent
Estimating the term…
Abstract
A temperature compensation circuit consists of a thermo sensitive resistance, a fixed resistance, a logic buffer, and a logic inverter, without incorporating any operational amplifier. A resistance value of the thermo sensitive resistance is changed by temperature change. The fixed resistance has a small temperature changes that is smaller than that of the thermo sensitive resistance. Both the fixed resistance and the thermo sensitive resistance are connected electrically to an output terminal of the temperature compensation circuit. The logic buffer sets the other terminal of the fixed resistance to a first voltage that is one of a voltage level of a power source and a ground level. The logic inverter sets the other terminal of the thermo sensitive resistance to a second voltage that is reversed to the first voltage.
Claims19
A temperature compensation circuit comprising:
- a first thermo sensitive resistance whose resistance value is changed according to a temperature change and whose one end terminal is connected electrically to an output terminal or the temperature compensation circuit;
- a first fixed resistance having a resistance change smaller than the resistance change of the first thermo sensitive resistance, and whose one end terminal being connected electrically to the output terminal of the temperature compensation circuit;
- first voltage fixing means configured to fix the other end terminal of the first fixed resistance to a first voltage which is one of a voltage level of a power source and a voltage level of ground;
- and
- second voltage fixing means configured to fix the other end terminal of the first thermo sensitive resistance to a second voltage which is reversed in voltage level with respect to the first voltage.
A temperature compensation circuit comprising a plurality of circuit stages electrically connected in multi stages, each circuit stage comprising:
- a first thermo sensitive resistance whose resistance value is changed according to a temperature change;
- a first fixed resistance having a resistance change smaller than the resistance change of the first thermo sensitive resistance, and whose one end terminal being connected electrically to one end terminal of the first thermo sensitive resistance;
- first voltage fixing means configured to fix the other end terminal of the first fixed resistance to a first voltage which is one of a voltage level of a power source and a voltage level of ground;
- and
- second voltage fixing means configured to fix the other end terminal of the first thermo sensitive resistance to a second voltage which is reversed in voltage level with respect to the first voltage, wherein each of the circuit stages is connected electrically to each other in multi stages through a second fixed resistance connected electrically to a connection node between the first fixed resistance and the thermal sensitive resistance in each circuit stage, and the one end terminal of the fixed resistance and the one end terminal of the thermal sensitive resistance in the final circuit stage are connected electrically to an output terminal of the temperature compensation circuit.
Dependencies are inferred from the claim text.