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A linear differential output of threshold-based CMOS temperature sensor with enhanced signal range

This work focuses on a new compact 6-transistor CMOS temperature sensor with improved flexibility for achieving target temperature linearity with small die area and low power consumption. The temperature information is provided in a differential output voltage that is based upon the linear dependence of threshold voltage on temperature. Implemented in a 0.18µm process, simulation results indicate the temperature linearity is at the 0.03°C level over the temperature range of −20 °C ∼100 °C without any trimming. Over the standard process corners, the untrimmed structure has temperature nonlinearity at the 0.11oC level and Monte Carlo simulation shows the mean nonlinearity with both process and mismatch is also around 0.11°C. Current consumption of this design is around 40µA and active area is approximately 40 µm2