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

BJT sensors require a minimum "headroom" voltage to operate accurately. Resistor-based topologies can often operate at much lower supply voltages (sub-1V), aligning better with modern ultra-low-power rails.

These utilize the doped regions of the silicon substrate. They often exhibit a higher TCR but are more susceptible to noise and substrate interference. Resistor-based Temperature Sensors in CMOS Tech...

High-ohmic polysilicon resistors can be fabricated in a smaller footprint than the multi-transistor arrays required for high-accuracy BJT sensing. BJT sensors require a minimum "headroom" voltage to

At the heart of a resistor-based sensor is the Temperature Coefficient of Resistance (TCR). In CMOS processes, different materials offer varying thermal responses: They often exhibit a higher TCR but are

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 TCR is not perfectly linear over wide ranges (e.g., -40°C to 125°C). Designers must implement compensation circuits, often using a combination of resistors with opposite temperature coefficients, to "flatten" the error curve. Applications and Future Outlook

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