关键词: 低功耗, 数字校准, 温度传感器

Abstract: In order to meet the requirements of temperature monitoring, portability and low power consumption of electronic products, a low power temperature sensor with calibration function is designed in this paper. It is integrated into the system chip and its core is a 10-bits Cyclic ADC with 200 kHz sample frequency. In the design, an integral amplifier with ping-pong operation is used to sample temperature voltage signals and trigger sampling mode is used to greatly reduce the power consumption. At the same time, the digital calibration technology eliminates the error caused by design and process and improves the precision. The circuit is designed based on UMC 55 nm 1P10M process. The simulation results show that the maximum deviation is 2.2 ℃, and the typical power consumption is 0.31 mW within the temperature range of -55-125 ℃, which meet the design requirements.

Key words: low power, digital calibrate, temperature sensor