Resistor-based Temperature Sensors In Cmos Tech... Guide

Utilizing the back-end-of-line (BEOL) metal layers provides a very stable, albeit lower, TCR, making them useful for specific high-stability requirements.

High-poly and low-poly resistors are frequently used. While they offer good linearity, their TCR can be sensitive to process variations. Resistor-based Temperature Sensors in CMOS Tech...

In conclusion, resistor-based temperature sensors represent a vital evolution in CMOS design. By trading off raw, uncalibrated precision for lower power, smaller area, and better scalability, they provide the thermal intelligence necessary for the next generation of smart devices. where they trigger refresh rate adjustments

Resistors are notoriously sensitive to manufacturing "corners." A resistor on one wafer may have a significantly different base resistance than one on another. Consequently, resistor-based sensors typically require one- or two-point calibration to achieve high accuracy (e.g., error < ±0.5°C). and in IoT nodes

Resistor-based sensors are now ubiquitous in , where they trigger refresh rate adjustments, and in IoT nodes , where power budgets are measured in microwatts. As we move toward 3nm processes and beyond, the focus is shifting toward "all-digital" temperature sensors that leverage the delay of resistive-capacitive (RC) networks, further blurring the line between analog sensing and digital processing.

For decades, the "Proportional to Absolute Temperature" (PTAT) voltage generated by BJTs was the industry standard. However, resistor-based sensors offer several distinct advantages in the nanometer CMOS era:

The fundamental principle involves measuring the voltage drop across these resistors when biased with a constant current or using them within a Wheatstone bridge configuration. Advantages over Traditional BJT Sensors