Authors:

Dong Wang

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About Paper:

Proportional-to-Absolute-Temperature (PTAT) Temperature sensors suffer from nonlinearity due to temperature-dependent semiconductor effects, limiting accuracy in wide-temperature-range applications. This work presents the design and optimization of a CMOS-based PTAT sensor, targeting improved linearity and reduced sensitivity to supply and process fluctuations. Using the Cadence GPDK045 technology, we analyze temperature dependencies of core components-bipolar junction transistors (BJTs), CMOS, and current mirrors-through a combination of analytical modeling and transistor-level simulations. An optimized PTAT architecture is proposed with carefully selected emitter area ratios, cascode current mirrors, and an folded-cascode differential amplifier stage to enhance temperature linearity. Simulation results demonstrate a linearity error below ±1?°C across 0?°C to 100?°C, validating the effectiveness of the proposed design. Keywords: Analog Design; Temperature Sensor; PTAT

Source:

Purdue University / 2025

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Co-authors:

Dong Wang