A temperature detection system and method

Abstract

The invention relates to a temperature detection system and method, and belongs to the temperature detection field. The system comprises a transistor circuit, a counter and a converting circuit; A transistor in the transistor circuit works in a subthreshold area, generates signals whose frequency changes with temperature, and sends the signals to the counter; the counter is connected between the transistor circuit and the converting circuits, counts the signals whose frequency changes with temperature, and sends an obtained counting value to the converting circuit; and the converting circuit is connected to the counter, and converts the counting value to a digital signal which represents the temperature. Thus, the temperature system can be low in power consumption, small in area and high in measuring precision.

Description

technical field [0001] The invention relates to the field of temperature detection, in particular to a temperature detection system and method in which a transistor works in a subthreshold region. Background technique [0002] The traditional temperature detection circuit uses the normal working area of ​​the device (for MOSFET For temperature detection, its gate-source voltage is greater than its threshold voltage), its main composition is as follows: firstly, the perceived temperature is converted into current or voltage by using the change of device characteristics with temperature, and then the continuous analog-to-digital conversion circuit is used to convert The current or voltage analog quantity is converted into a discrete digital quantity, and then this digital quantity representing the current or voltage changing with temperature is further linearly converted or decoded into a digital quantity representing the perceived temperature, such as figure 1 shown. [000...

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Problems solved by technology

[0003] Disadvantages of this traditional circuit for detecting temperature: the device works in the normal working area, its voltage is relatively high, and its current is relatively large, so the power consumption of the circuit is large; the analog-to-digital conversion circuit is used to convert the current / voltage analog signal representing the detection temperature It is converted into a current / voltage digital signal representing the detected temperature, so the area of ​​the analog-to-digital conversion circuit is relatively large, and at the same time, the power consumption of the overall circuit is relatively large; a linear conversion circuit (linear decoder) is used to convert the current / voltage digital signal representing the detected temperature The signal is linearly converted into a digital signal representing the detection temperature, and the change of the current / voltage analog signal representing the detection temperature with temperature is approximated as a linear relationship, while ignoring the nonlinearity between the current / voltage analog signal representing the detection temperature and temperature relationship, which will lead to large errors in certain temperature ranges and reduce the accuracy of temperature detection; under normal operating voltage, the current / voltage for detecting temperature does not change significantly with temperature, which limits the improvement of the accuracy of temperature detection

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