A 210 nW NPN-Based Temperature Sensor With an Inaccuracy of ±0.15 °C (3σ) From −15 °C to 85 °C Utilizing Dual-Mode Frontend

A 210 nW NPN-Based Temperature Sensor With an Inaccuracy of ±0.15 °C (3σ) From −15 °C to 85 °C Utilizing Dual-Mode Frontend

Someya, T. (TU Delft Electronic Instrumentation)
Van Hoek, Vincent (Student TU Delft)
Angevare, J. (TU Delft Electronic Instrumentation)
Pan, S. (TU Delft Electronic Instrumentation)
Makinwa, K.A.A. (TU Delft Microelectronics)

Microelectronics

2022

This letter describes an NPN-based temperature sensor that achieves a 1-point trimmed inaccuracy of ±0.15 °C (3σ) from -15 to 85 °C while dissipating only 210 nW. It uses a dual-mode frontend to roughly halve the power consumption of conventional frontends. First, two NPNs are used to generate a well-defined PTAT bias current, then this current is sampled and applied to the same NPNs to generate well-defined PTAT and CTAT voltages. These voltages are then applied to a low-power tracking ΔΣ modulator-based ADC, which employs a digital filter to efficiently generate a multibit representation of temperature. A prototype fabricated in a 180-nm BCD process achieves 15-mK resolution in a 50 ms conversion time, which translates into a state-of-the-art resolution FoM of 2.3 pJK2.

BJT
low leakage
low power
temperature sensor
temperature-to-digital converter

http://resolver.tudelft.nl/uuid:90928aa5-1a16-4aaf-a96d-fafc3d432ece

https://doi.org/10.1109/LSSC.2022.3222578

2023-05-16

2573-9603

IEEE Solid State Circuits Letters, 5, 272-275

Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.

Institutional Repository

journal article

© 2022 T. Someya, Vincent Van Hoek, J. Angevare, S. Pan, K.A.A. Makinwa