Ultra-low power consumption multi-mode high precision temperature sensor with configurable single-point calibration

Abstract

The invention discloses an ultra-low power consumption multi-mode high precision temperature sensor with configurable single-point calibration, and the sensor comprises a sensor front end and a first-order increment sigma-delta analog-digital converter, wherein the sensor front end comprises a bipolar transistor, an operational amplifier with a chopper, a bipolar transistor current gain compensation resistor, a current mirroring circuit, a dynamic element matching module DEM CONTROL 1, and an Mux circuit; and the first-order increment sigma-delta analog-digital converter comprises a switched capacitor array, a first-order analog-digital modulator (sigma-delta modulator), a comparator, a digital filter, and a dynamic element matching module DEM CONTROL 2. The high precision temperature sensor provided by the invention can realize the temperature measurement with accuracy of plus or minus 0.1 DEG C in but not limited to the body temperature range, and can achieve different precisions inthe full temperature range according to different configurations. Under the premise of ultra-low power consumption, the high precision temperature sensor provided by the invention can balance the user's demands for precision and measurement time.

Description

technical field [0001] The invention relates to the technical field of semiconductors and on-chip temperature sensors, in particular to a high-precision temperature sensor with ultra-low power consumption, multi-mode configuration, and single-point calibration. Background technique [0002] With the advent of the Internet of Things era, various wearable and bio-implantable medical devices have been used to monitor human health for a long time, and body temperature is an important indicator to measure human health. Therefore, the temperature sensor used in the temperature measurement system has higher and higher requirements for the accuracy of its temperature configuration, such as: the accuracy of ±0.1°C is required in the range of 37ºC to 39ºC; in the range below 37ºC and above 39ºC Accuracy within ±0.2°C is achieved. In order to extend the battery life of these devices and reduce the number of battery replacements, temperature sensors need to achieve ultra-low power cons...

AI Technical Summary

Problems solved by technology

[0004] Ultra-high-precision temperature sensors usually require the use of dynamic component matching technology and system-level chopping, and in order to achieve an accuracy of ±0.1°C in the entire temperature range, it is usually necessary to use a second-order incremental Σ-Δ modulus converter (incremental sigma-delata ADC), but this application greatly increases power loss, so ultra-low power consumption and high-precision temperature sensors are gradually leading the market

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