This paper presents a compact temperature sensor that directly controls a temperature-dependent self-refresh period of a mobile DRAM in 28nm CMOS. It uses a dynamic threshold MOST (DTMOST) as a sensing device that periodically discharges a capacitor. The discharging voltage across the capacitor denotes a supply-independent behavior and the temperature-dependent discharging period of the DTMOST diode is detected by incorporating it into a relaxation oscillator. The sensor occupies only 0.017mm2 and achieves a 3σ inaccuracy of ±0.9°C from -10 to 90°C after 1-point trim. Operating from 0.85 to 1.15V, it shows a low supply sensitivity of 0.27°C/V at room temperature. It consumes 33.75μW and achieves a resolution of 10.2mK. This corresponds to a resolution FoM of 0.36pJ· K2.
|Title of host publication||2020 IEEE Custom Integrated Circuits Conference, CICC 2020|
|Publisher||Institute of Electrical and Electronics Engineers Inc.|
|Publication status||Published - 2020 Mar|
|Event||2020 IEEE Custom Integrated Circuits Conference, CICC 2020 - Boston, United States|
Duration: 2020 Mar 22 → 2020 Mar 25
|Name||Proceedings of the Custom Integrated Circuits Conference|
|Conference||2020 IEEE Custom Integrated Circuits Conference, CICC 2020|
|Period||20/3/22 → 20/3/25|
Bibliographical noteFunding Information:
ACKNOWLEDGEMENTS This work is supported by Samsung Electronics.
© 2020 IEEE.
All Science Journal Classification (ASJC) codes
- Electrical and Electronic Engineering