**8. Conclusions**

A highly accurate, polynomial-based adaptive digital temperature compensation is presented for automotive piezoresistive pressure sensor applications. By integrating compensation characteristics of the pressure sensor as function of temperature, non-ideal temperature dependency of the pressure sensor is accurately compensated. The compensation polynomial is fully implemented in a digital form with a scaling technique introduced to enhance its accuracy. For area and power efficient design, a resource-sharing technique is adopted. The NTC instead of PTAT or CTAT is used as a temperature-sensing element as it offers the best temperature characteristics for ACE-Q100 grade 0 ambient temperature operating range. A high-resolution 14-bit SD-ADC is proposed for improving accuracy over a wide temperature range. When temperature varies from −40 ◦C to 150 ◦C according to ACE-Q100, temperature compensation accuracy reported is 99.93% and it is within ±0.068% at full scale. It takes 37 μs to compute the temperature compensation with 10 MHz of clock frequency. The proposed technique is integrated in an automotive pressure sensor signal conditioning IC using a 1P6M 180 nm CMOS process.

**Author Contributions:** K.-Y.L. guided and directed the authors for this work. I.A. proposed, designed, simulated and implemented the overall architecture and wrote paper. M.A., K.S., M.R.U.R. and D.G.K. contributed to the synthesis and place and route (P&R). They also contributed to integrating the design in the top layout of the chip. K.S. and B.S.R. helped in designing SD-ADC and paper writing. D.G.K. contributed in designing the PGA, testing board and performing measurement. Y.P. and S.S.Y. gave advice about implementation issues and reviewed the paper before submission. All authors have read and agreed to the published version of the manuscript.

**Funding:** This work was supported by Institute of Information & communications Technology Planning & Evaluation (IITP) gran<sup>t</sup> funded by the Korea governmen<sup>t</sup> (MSIT) (No.2020-0-00261, Development of low power/low delay/self-power suppliable RF simultaneous information and power transfer system and stretchable electronic epineurium for wireless nerve bypass implementation).

**Conflicts of Interest:** The authors declare no conflict of interest.
