A Sub-1.0-V On-Chip CMOS Thermometer With a Folded Temperature Sensor for Low-Power Mobile DRAM
- Authors
- Lee, Hyunjoong; Shim, Daeyong; Rhee, Cyuyeol; Kim, Mino; Kim, Suhwan
- Issue Date
- Jun-2016
- Publisher
- IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
- Keywords
- Folding; low voltage; mobile DRAM; self-refresh; temperature sensor; thermometer
- Citation
- IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS, v.63, no.6, pp.553 - 557
- Journal Title
- IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS
- Volume
- 63
- Number
- 6
- Start Page
- 553
- End Page
- 557
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/88625
- DOI
- 10.1109/TCSII.2016.2530803
- ISSN
- 1549-7747
- Abstract
- As Dynamic Random Access Memory (DRAM) supply voltages drop below 1 V with the scaling down of the process, it becomes increasingly difficult to construct a temperature sensor with sufficient accuracy to control self-refresh, without occupying significant area or consuming increased power. In this brief, we propose an on-chip CMOS thermometer with a temperature sensor, the output of which is divided into segments by a folding scheme. The slopes of these segments can be arranged to be the same or adjusted separately, as desired for the output. Implemented in a 29-nm DRAM process, the sensor operates from -40 degrees C to 95 degrees C at the supply voltage of 0.8 V, with a temperature sensitivity of -3.1 mV/degrees C between -40 degrees C and 35 degrees C, and -2.1 mV/degrees C between 35 degrees C and 95 degrees C. It has an area of 0.0016 mm(2) and consumes less than 0.144 mu W.
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