Thermal sensor with temperature control
First Claim
1. A thermal sensor, comprising:
- a capacitor configured to be charged or discharged by at least one of a first current signal or a second current signal;
a latch configured to selectively connect or disconnect the first current signal and the capacitor in response to a feedback signal; and
a comparator coupled with the capacitor and configured to output an output voltage based on a comparison of a capacitor voltage of the capacitor to a reference voltage;
whereinthe first current signal is a temperature-independent signal, and the second current signal is a temperature-dependent signal dependent on a temperature detected by the thermal sensor, andthe output voltage defines the feedback signal and has a pulse density indicative of the temperature detected by the thermal sensor.
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Abstract
In a thermal sensor. a capacitor voltage of a capacitor is compared with a reference voltage, and an output voltage is generated based on the comparison. The output voltage has a pulse density indicative of a temperature detected by the thermal sensor. The capacitor is charged or discharged using at least one of a first current signal or a second current signal based on a logic level of the output voltage. The first current signal is a temperature-independent signal, and the second current signal is a temperature-dependent signal dependent on the temperature detected by the thermal sensor. In some embodiments, a clock rate of a clock signal is varied in accordance with the detected temperature to control a timing operation for supplying the first current signal to the capacitor and/or the reference voltage is varied in accordance with the detected temperature.
26 Citations
20 Claims
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1. A thermal sensor, comprising:
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a capacitor configured to be charged or discharged by at least one of a first current signal or a second current signal; a latch configured to selectively connect or disconnect the first current signal and the capacitor in response to a feedback signal; and a comparator coupled with the capacitor and configured to output an output voltage based on a comparison of a capacitor voltage of the capacitor to a reference voltage; wherein the first current signal is a temperature-independent signal, and the second current signal is a temperature-dependent signal dependent on a temperature detected by the thermal sensor, and the output voltage defines the feedback signal and has a pulse density indicative of the temperature detected by the thermal sensor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A thermal sensor, comprising:
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a capacitor configured to be charged or discharged by at least one of a first current signal or a second current signal, wherein the first current signal is a temperature-independent signal, and the second current signal is a temperature-dependent signal dependent on a temperature detected by the thermal sensor; a comparator coupled with the capacitor and configured to output an output voltage based on a comparison of a capacitor voltage of the capacitor to a reference voltage, wherein the output voltage has a pulse density indicative of the temperature detected by the thermal sensor; and a temperature control circuit configured to vary the reference voltage in accordance with the detected temperature. - View Dependent Claims (15, 16, 17)
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18. A method of operating a thermal sensor, said method comprising:
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comparing a capacitor voltage of a capacitor with a reference voltage; generating an output voltage based on the comparison, the output voltage having a pulse density indicative of a temperature detected by the thermal sensor; and charging or discharging the capacitor using at least one of a first current signal or a second current signal based on a logic level of the output voltage, wherein the first current signal is a temperature-independent signal, and the second current signal is a temperature-dependent signal dependent on the temperature detected by the thermal sensor. - View Dependent Claims (19, 20)
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Specification