Temperature sensor device and methods thereof
First Claim
1. A device, comprising:
- a first transistor comprising a control electrode coupled to a first voltage reference, a first current electrode to provide a CTAT signal relative a voltage at the control electrode, and a second current electrode coupled to the first voltage reference;
a second transistor comprising a control electrode coupled to a second voltage reference, a first current electrode to provide a PTAT signal, and a second current electrode coupled to the first voltage reference;
a comparator comprising a first input coupled to the first current electrode of the first transistor, a second input coupled to the first current electrode of the second transistor, and an output; and
a first level shifter coupled between the first transistor and the first input of the comparator.
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Abstract
A device having a temperature sensor device is disclosed. The temperature sensor device includes a complementary to absolute temperature (CTAT) module and a reference module. Both the temperature sensor and the reference voltage module provide signals, that vary in a complementary relationship with the variation in temperature. While the signals can be voltages or currents, for purposes of discussion the signals are discussed in terms of voltages herein. The reference module provides a signal that has a relatively small variation with temperature as compared to the variation in a signal provided by the CTAT module. The signals are provided to a comparator, which provides a temperature control signal based on a comparison of the input signals.
57 Citations
20 Claims
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1. A device, comprising:
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a first transistor comprising a control electrode coupled to a first voltage reference, a first current electrode to provide a CTAT signal relative a voltage at the control electrode, and a second current electrode coupled to the first voltage reference; a second transistor comprising a control electrode coupled to a second voltage reference, a first current electrode to provide a PTAT signal, and a second current electrode coupled to the first voltage reference; a comparator comprising a first input coupled to the first current electrode of the first transistor, a second input coupled to the first current electrode of the second transistor, and an output; and a first level shifter coupled between the first transistor and the first input of the comparator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method, comprising:
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generating a first signal that varies inversely with respect to temperature at a first rate, the first signal being an electrical signal; generating a second signal that varies inversely with respect to temperature at a second rate, the second rate different from the first rate; providing a temperature level indication signal based on a comparison of the first signal to the second signal; and gating a clock signal based on the temperature level indication signal. - View Dependent Claims (17, 18, 19)
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20. A device, comprising:
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means for generating a first signal that varies inversely with respect to temperature at a first rate; means for generating a second signal that varies inversely with respect to temperature at a second rate, the second rate different from the first rate; and means for providing a temperature level indication signal based on a comparison of the first signal to the second signal; and means for controlling a first power mode of a first module of an integrated circuit device based on the temperature level indication signal while maintaining a second power mode of a second module of the integrated circuit device.
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Specification