THERMAL SENSOR WITH TEMPERATURE CONTROL

摘要

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.

主权项

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; 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.