We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
An Area-Effective High-Resolution All-Digital CMOS Time-Domain Smart Temperature Sensor.
- Authors
Chen, Chun-Chi; Chen, Chao-Lieh; Chu, Yen-Chan; Lin, Guan-Yu
- Abstract
This study introduces an all-digital CMOS time-domain smart temperature sensor (STS) that offers a smaller circuit area and reduced complexity. In contrast to previous studies that utilized multiple delay lines or additional path selection circuits, the proposed new structure employs a single cyclic path and fewer delay lines. The functionality of high-resolution temperature sensing, pulse-shrinking time measurement, and built-in offset-error cancellation is achieved using only one cyclic delay line (CDL). The temperature-sensing delay line generates a thermal-dependent pulse width proportional to the absolute temperature (PTAT). Subsequently, a pulse-shrinking unit, implemented within the pulse-shrinking delay line, performs time-to-digital conversion by measuring the PTAT pulse width. Finally, a time-added delay line within the CDL incorporates a simple D-type Flip Flop to enable concise offset-error cancellation, thereby improving accuracy. This study further simplifies the cancellation circuitry to reduce the overall circuit area. The proposed sensor, fabricated using a TSMC 0.35 μ m CMOS process, occupies an area of 0.022 mm 2 , providing a cost-effective solution for pulse-shrinking STSs. The maximum inaccuracy after offset-error cancellation is 1. 3 ∘ C within a temperature range of 0 ∼ 80 ∘ C, with a high resolution of approximately 0. 035 ∘ C/LSB. This resolution enhancement significantly surpasses similar studies. By reducing circuit complexity, the proposed sensor successfully achieves improvements in both area and resolution.
- Subjects
INTELLIGENT sensors; TEMPERATURE sensors; DELAY lines; CIRCUIT complexity; COMPLEMENTARY metal oxide semiconductors; TIME measurements
- Publication
Circuits, Systems & Signal Processing, 2024, Vol 43, Issue 2, p1144
- ISSN
0278-081X
- Publication type
Article
- DOI
10.1007/s00034-023-02507-y