Temperature sensor, circuit device, oscillator, electronic apparatus, and vehicle
Provided is a temperature sensor including a bipolar transistor, a resistor, and a variable resistance circuit. The resistor is provided between a first node coupled to a base node of the bipolar transistor and a collector node of the bipolar transistor. The variable resistance circuit is provided between an emitter node of the bipolar transistor and a ground node.
1. A temperature sensor for outputting a temperature detection voltage, comprising:
a first bipolar transistor;
a first resistor provided between a first node coupled to a first base node that is a base node of the first bipolar transistor and a first collector node that is a collector node of the first bipolar transistor;
a first variable resistance circuit provided between a first emitter node that is an emitter node of the first bipolar transistor and a ground node; and
a constant current circuit provided between a power supply node and the first node and outputting a constant current to the first node.
2. A circuit device comprising:
the temperature sensor according to claim 1 ; and
a circuit operating based on the temperature detection voltage from the temperature sensor.
3. A circuit device comprising:
the temperature sensor according to claim 1 ;
an oscillation circuit oscillating a vibrator; and
a temperature compensation circuit outputting a temperature compensation signal that temperature compensates an oscillation frequency of the oscillation circuit based on the temperature detection voltage from the temperature sensor.
4. An oscillator comprising:
the circuit device according to claim 3 ; and
the vibrator.
5. A temperature sensor for outputting a temperature detection voltage, comprising:
a first bipolar transistor;
a first resistor provided between a first node coupled to a first base node that is a base node of the first bipolar transistor and a first collector node that is a collector node of the first bipolar transistor;
a first variable resistance circuit provided between a first emitter node that is an emitter node of the first bipolar transistor and a ground nod,
wherein
the first variable resistance circuit includes
a plurality of resistors coupled in series between the first emitter node and the ground node, and
a plurality of switches each of which is coupled between one end of one of the plurality of resistors and the ground node.
6. A circuit device comprising:
the temperature sensor according to claim 5 ; and
a circuit operating based on the temperature detection voltage from the temperature sensor.
7. A circuit device comprising:
the temperature sensor according to claim 3 ;
an oscillation circuit oscillating a vibrator; and
a temperature compensation circuit outputting a temperature compensation signal that temperature compensates an oscillation frequency of the oscillation circuit based on the temperature detection voltage from the temperature sensor.
8. An oscillator comprising:
the circuit device according to claim 7 ; and
the vibrator.
9. A temperature sensor for outputting a temperature detection voltage, comprising:
a first bipolar transistor;
a first resistor provided between a first node coupled to a first base node that is a base node of the first bipolar transistor and a first collector node that is a collector node of the first bipolar transistor;
a first variable resistance circuit provided between a first emitter node that is an emitter node of the first bipolar transistor and a ground nod;
a buffer circuit outputting the temperature detection voltage by buffering an output voltage from the first collector node; and
a back gate voltage control circuit, wherein
the buffer circuit has a differential section having a current mirror circuit and a differential pair that is electrically coupled to the current mirror circuit,
the current mirror circuit is constituted by a first transistor and a second transistor that are MOS transistors,
the differential pair is constituted by a first differential pair transistor and a second differential pair transistor that are bipolar transistors,
the output voltage from the first collector node is input to a base node of the first differential pair transistor, and an output node of the buffer circuit is electrically coupled to a base node of the second differential pair transistor, and
the back gate voltage control circuit controls at least one of a back gate voltage of the first transistor and a back gate voltage of the second transistor.
10. A circuit device comprising:
the temperature sensor according to claim 9 ; and
a circuit operating based on the temperature detection voltage from the temperature sensor.
11. A circuit device comprising:
the temperature sensor according to claim 9 ;
an oscillation circuit oscillating a vibrator; and
a temperature compensation circuit outputting a temperature compensation signal that temperature compensates an oscillation frequency of the oscillation circuit based on the temperature detection voltage from the temperature sensor.
12. An oscillator comprising:
the circuit device according to claim 11 ; and
the vibrator.
13. A temperature sensor for outputting a temperature detection voltage, comprising:
a first bipolar transistor;
a first resistor provided between a first node coupled to a first base node that is a base node of the first bipolar transistor and a first collector node that is a collector node of the first bipolar transistor;
a first variable resistance circuit provided between a first emitter node that is an emitter node of the first bipolar transistor and a ground nod;
a second bipolar transistor;
a second resistor provided between a second node coupled to a second base node that is a base node of the second bipolar transistor and a second collector node that is a collector node of the second bipolar transistor; and
a second variable resistance circuit provided between a second emitter node that is an emitter node of the second bipolar transistor and the first collector node.
14. The temperature sensor according to claim 13 , further comprising:
a buffer circuit outputting the temperature detection voltage by buffering an output voltage from the second collector node; and
a back gate voltage control circuit, wherein
the buffer circuit has a differential section having a current mirror circuit and a differential pair that is electrically coupled to the current mirror circuit,
the current mirror circuit is constituted by a first transistor and a second transistor that are MOS transistors,
the differential pair is constituted by a first differential pair transistor and a second differential pair transistor that are bipolar transistors,
the output voltage from the second collector node is input to a base node of the first differential pair transistor, and an output node of the buffer circuit is electrically coupled to a base node of the second differential pair transistor, and
the back gate voltage control circuit controls at least one of a back gate voltage of the first transistor and a back gate voltage of the second transistor.
15. A circuit device comprising:
the temperature sensor according to claim 13 ; and
a circuit operating based on the temperature detection voltage from the temperature sensor.
16. A circuit device comprising:
the temperature sensor according to claim 13 ;
an oscillation circuit oscillating a vibrator; and
a temperature compensation circuit outputting a temperature compensation signal that temperature compensates an oscillation frequency of the oscillation circuit based on the temperature detection voltage from the temperature sensor.
17. A temperature sensor for outputting a temperature detection voltage, comprising:
a first bipolar transistor;
a first resistor provided between a first node coupled to a first base node that is a base node of the first bipolar transistor and a first collector node that is a collector node of the first bipolar transistor;
a second bipolar transistor;
a second resistor provided between a second node coupled to a second base node that is a base node of the second bipolar transistor and a second collector node that is a collector node of the second bipolar transistor; and
a variable resistance circuit provided between a second emitter node that is an emitter node of the second bipolar transistor and the first collector node.
18. An oscillator comprising:
the circuit device according to claim 16 ; and
the vibrator.
19. The temperature sensor according to claim 17 , further comprising:
a buffer circuit outputting the temperature detection voltage by buffering an output voltage from the second collector node; and
a back gate voltage control circuit, wherein
the buffer circuit has a differential section having a current mirror circuit and a differential pair that is electrically coupled to the current mirror circuit,
the current mirror circuit is constituted by a first transistor and a second transistor that are MOS transistors,
the differential pair is constituted by a first differential pair transistor and a second differential pair transistor that are bipolar transistors,
the output voltage from the second collector node is input to a base node of the first differential pair transistor, and an output node of the buffer circuit is electrically coupled to a base node of the second differential pair transistor, and
the back gate voltage control circuit controls at least one of a back gate voltage of the first transistor and a back gate voltage of the second transistor.
20. An electronic apparatus comprising:
the circuit device according to claim 19 ; and
a processing device operating based on an output signal from the circuit device.
21. A vehicle comprising:
the circuit device according to claim 19 ; and
a processing device operating based on an output signal from the circuit device.