Temperature compensation circuit

Abstract

To provide a temperature compensation circuit capable of easily changing a temperature coefficient.SOLUTION: A temperature-dependent current generating circuit includes a temperature-dependent element having electrical characteristics that depend on temperature, and generates a plurality of temperature-dependent currents whose levels change in response to the temperature of the temperature-dependent element and whose ratios of level change to temperature change are different. A plurality of current-to-voltage converting circuits generate a plurality of temperature-dependent voltages based on the plurality of temperature-dependent currents, respectively.SELECTED DRAWING: Figure 1

Claims

1. A temperature-dependent current generation circuit includes a temperature-dependent element having temperature-dependent electrical properties, and generates multiple temperature-dependent currents whose levels change according to the temperature of the temperature-dependent element and which have different ratios of level change to temperature change, Multiple current-voltage conversion circuits that generate multiple temperature-dependent voltages based on each of the multiple temperature-dependent currents, A temperature compensation circuit is included.

2. Each of the above-mentioned multiple current-voltage conversion circuits is, Multiple resistor multi-stage connected circuits to which each of the aforementioned multiple temperature-dependent currents is input, A plurality of first selection circuits connected to each of the plurality of resistor multi-stage connection circuits and Includes, Each of the aforementioned multi-stage resistor connection circuits includes a plurality of resistor elements connected in multiple stages, The temperature compensation circuit according to claim 1, wherein each of the plurality of first selection circuits selects one from voltage extraction nodes which are interconnection points of a plurality of resistor elements of a connected resistor multistage circuit, and outputs the voltage of the selected voltage extraction node as the temperature-dependent voltage.

3. The temperature-dependent current generation circuit described above is A first current generation circuit that generates a first current that is independent of the temperature of the temperature-dependent element, A second current generation circuit that generates a second current that depends on the temperature of the temperature-dependent element, Multiple third current generation circuits, which together constitute a current mirror with the first current generation circuit and output multiple third currents using the first current as a reference current, Multiple fourth current generation circuits, which together constitute a current mirror with the second current generation circuit and output multiple fourth currents using the second current as a reference current, A combining circuit connected to the plurality of third current generation circuits and the plurality of fourth current generation circuits, which adds the third current and the fourth current together and outputs them as the temperature-dependent current from each of the plurality of output nodes. Includes, The temperature compensation circuit according to claim 1 or 2, wherein the ratio of the number of third current generation circuits connected to each of the plurality of output nodes to the number of fourth current generation circuits differs among the plurality of output nodes.

4. The temperature compensation circuit according to claim 3, further comprising a voltage-current conversion circuit that converts the temperature-dependent voltage generated by at least one of the plurality of current-voltage conversion circuits into a current.

5. The temperature compensation circuit according to claim 4, further comprising a second selection circuit that selects one of the plurality of current-voltage conversion circuits and inputs the temperature-dependent voltage output from the selected current-voltage conversion circuit to the voltage-current conversion circuit.

6. The temperature-dependent current generation circuit described above is A first current generation circuit that generates a first current that is independent of the temperature of the temperature-dependent element, A second current generation circuit that generates a second current that depends on the temperature of the temperature-dependent element, A plurality of fifth current generation circuits, which form a current mirror with one of the first current generation circuit and the second current generation circuit and output a fifth current using the first current or the second current as a reference current, A plurality of switches are provided to select one of the first current generation circuit and the second current generation circuit as the current source on the reference current side that constitutes a current mirror with each of the plurality of fifth current generation circuits, A combining circuit connected to some of the plurality of fifth current generation circuits, which sums the fifth currents and outputs them as the temperature-dependent current from each of the plurality of output nodes. A temperature compensation circuit according to claim 1 or 2, comprising:

7. The temperature compensation circuit according to claim 6, further comprising a voltage-current conversion circuit that converts the temperature-dependent voltage generated by at least one of the plurality of current-voltage conversion circuits into a current.

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