Pulse modulation temperature sensor calibration system and calibration method

Abstract

The invention provides a pulse modulation temperature sensor calibration system and calibration method, and belongs to the technical field of integrated circuit design. The system comprises a pulse digital conversion module and a temperature control module. The method comprises the steps that a theoretical method which enables the digital output value of the temperature sensor to have a linear relation with the temperature and can be implemented in engineering is established; the pulse digital conversion module is constructed according to the theoretical method so as to generate the digital output value having the linear relation with the temperature; and the temperature control module acquires the actual digital output value of the reference temperature, calculates the deviation value according to the stored simulation digital output value and the actual digital output value and calibrates the digital output value of the temperature sensor according to the deviation value. According to the system and the method, the measurement accuracy of the sensor can be enhanced, the calibration process can be simplified, real-time automatic calibration can be performed and the circuit structure can be simplified.

Description

technical field [0001] The invention belongs to the technical field of integrated circuit design, and in particular relates to a calibration system and a calibration method for a pulse modulation temperature sensor. Background technique [0002] With the development of the Internet of Things, smart products such as smart homes, smart cars, and wearable devices continue to emerge. These smart products are inseparable from temperature measurement, and temperature sensors of CMOS technology are widely used. One of the realization methods of CMOS technology temperature sensor is pulse width modulation temperature sensor. It uses a delay module to generate output pulses, uses the temperature characteristics of MOS leakage current to make the width of the output pulses related to temperature, and uses a counting function circuit to convert the output pulses containing temperature information into digital outputs. However, the digital output of the sensor is affected by process er...

AI Technical Summary

Problems solved by technology

[0004] 1. Using the two-point calibration method, two reference temperatures need to be measured, and the calibration process is complicated;

[0005] 2. During the use of the sensor, a separate calibration link is required, and it cannot be automatically calibrated in real time;

[0006] 3. The calibration circuit may need to reserve more oscillator units, or adopt a double phase-locked loop structure, and the circuit structure is complex

[0007] In view of this, the present invention proposes a calibration method and system for a pulse modulation temperature sensor, which solves the problem of digital output deviation of the sensor, improves the measurement accuracy of the sensor, and overcomes the above-mentioned shortcomings in the existing calibration circuit at the same time

Images