A 23 nW CMOS ultra-low power temperature sensor operational from 0.2 V

Kamakshi, Divya Akella; Shrivastava, Aatmesh; Calhoun, Benton H.

doi:10.1109/s3s.2015.7333498

Cited by 8 publications

(8 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In this paper, we propose to further lower the power consumption of a temperature sensor system with the use of a sub-VT sensor core that consumes very low power and energy and is operational down to 0.2 V VDD [10]. A simplified block diagram of the proposed temperature sensor is shown in Figure 1.…”

Section: A 24 Ghzmentioning

confidence: 99%

“…The above components are described in detail in this section. [10]: it consists of a sub-VT PTAT current source, a bit-weighted current mirror, a current controlled oscillator and a digital block. (Based on "A 23 nW CMOS Ultra-Low Power Temperature Sensor Operational from 0.2 V", by Divya Akella Kamakshi, Aatmesh Shrivastava, and Benton H. Calhoun, which appeared in SOI-3D-Subthreshold Microelectronics Technology Unified Conference (S3S), 2015 IEEE, Rohnert Park, CA, 2015, pp.…”

Section: Components Of the Temperature Sensor Systemmentioning

confidence: 99%

mentioning

confidence: 99%

“…(a) When a current mirror branch is disabled by pulling PMOS to only 0.2 V V DD , it is not effectively turned off and its leakage contributes to the BWCM current causing non-linearity in the BWCM current vs. temperature curve (R 2 = 0.9753)[10]; and (b) the disabled BWCM current mirror branch is turned off by tying the PMOS gate to 0.5 V V DDH . This reduces the PMOS leakage and enables a highly linear BWCM current vs. temperature performance (R 2 = 0.9997)[10]. (Based on "A 23 nW CMOS Ultra-Low Power Temperature Sensor Operational from 0.2 V", by Divya Akella Kamakshi, Aatmesh Shrivastava, and Benton H. Calhoun, which appeared in SOI-3D-Subthreshold Microelectronics Technology Unified Conference (S3S), 2015 IEEE, Rohnert Park, CA, USA, 2015, pp.…”

mentioning

confidence: 99%

“…NMOS-only CCO in which the frequency is determined by I BWCM and capacitors C L[10]. (Based on "A 23 nW CMOS Ultra-Low Power Temperature Sensor Operational from 0.2 V", by Divya Akella Kamakshi, Aatmesh Shrivastava, and Benton H. Calhoun, which appeared in SOI-3D-Subthreshold Microelectronics Technology Unified Conference (S3S), 2015 IEEE, Rohnert Park, CA, USA, 2015, pp.…”

mentioning

confidence: 99%

See 4 more Smart Citations

A 0.2 V, 23 nW CMOS Temperature Sensor for Ultra-Low-Power IoT Applications

Kamakshi

Shrivastava

Calhoun

2016

JLPEA

Self Cite

View full text Add to dashboard Cite

We propose a fully on-chip CMOS temperature sensor in which a sub-threshold (sub-V T) proportional-to-absolute-temperature (PTAT) current element starves a current-controlled oscillator (CCO). Sub-V T design enables ultra-low-power operation of this temperature sensor. However, such circuits are highly sensitive to process variations, thereby causing varying circuit currents from die to die. We propose a bit-weighted current mirror (BWCM) architecture to resist the effect of process-induced variation in the PTAT current. The analog core constituting the PTAT, the CCO, and the BWCM is operational down to 0.2 V supply voltage. A digital block operational at 0.5 V converts the temperature information into a digital code that can be processed and used by other components in a system-on-chip (SoC). The proposed temperature sensor system also supports resolution-power trade-off for Internet-of-things (IoT) applications with different sampling rates and energy needs. The system power consumption is 23 nW and the maximum temperature inaccuracy is +1.5/´1.7˝C from 0˝C to 100˝C with a two-point calibration. The temperature sensor system was designed in a 130 nm CMOS technology and its total area is 250ˆ250 µm 2 .

show abstract

Section: A 24 Ghzmentioning

confidence: 99%

Section: Components Of the Temperature Sensor Systemmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

See 3 more Smart Citations