Resistor-based Temperature Sensors In Cmos Tech... Apr 2026

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

These utilize the doped regions of the silicon substrate. They often exhibit a higher TCR but are more susceptible to noise and substrate interference.

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. Resistor-based Temperature Sensors in CMOS Tech...

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:

High-poly and low-poly resistors are frequently used. While they offer good linearity, their TCR can be sensitive to process variations. error Despite their benefits

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

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). uncalibrated precision for lower power

Despite their benefits, these sensors face two primary hurdles: and non-linearity .