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These utilize the doped regions of the silicon substrate. They often exhibit a higher TCR but are more susceptible to noise and substrate interference.
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 Resistor-based Temperature Sensors in CMOS Tech...
At the heart of a resistor-based sensor is the Temperature Coefficient of Resistance (TCR). In CMOS processes, different materials offer varying thermal responses: These utilize the doped regions of the silicon substrate
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. Advantages over Traditional BJT Sensors At the heart
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).
High-poly and low-poly resistors are frequently used. While they offer good linearity, their TCR can be sensitive to process variations.
High-ohmic polysilicon resistors can be fabricated in a smaller footprint than the multi-transistor arrays required for high-accuracy BJT sensing.
