BJT-based temperature sensors are widely used due to their high accuracy over a wide temperature range with a low-cost 1-point trim. Although resistor-based sensors can achieve better energy efficiency, they typically require a 2-point trim to achieve comparable accuracy, while thermal-diffusivity based sensors achieve superior accuracy at the cost of energy efficiency . This paper presents a BJT-based temperature sensor that achieves both excellent accuracy and energy efficiency. To avoid the kTfC noise limitations of conventional discrete-time (OT) readout schemes , , it employs a compact continuous-time (CT) front-end. Component mismatch, which often limits the accuracy of CT front-ends , , is mitigated by a combination of dynamic element matching (OEM) and a low-cost resistor-ratio self-calibration scheme. As a result, the sensor achieves a resolution FoM of 0.85textpJcdotK 2, and a competitive inaccuracy of pm 0.1 circC (3sigma) from -55 circC tO 125 circC after a 1-point trim. This makes it 4times more energy-efficient than state-of-the-art BJT-based sensors with similar accuracy , , .
|Title of host publication||2023 IEEE International Solid-State Circuits Conference, ISSCC 2023|
|Publisher||Institute of Electrical and Electronics Engineers (IEEE)|
|Number of pages||3|
|Publication status||Published - 2023|
|Event||2023 IEEE International Solid-State Circuits Conference, ISSCC 2023 - Virtual, Online, United States|
Duration: 19 Feb 2023 → 23 Feb 2023
|Name||Digest of Technical Papers - IEEE International Solid-State Circuits Conference|
|Conference||2023 IEEE International Solid-State Circuits Conference, ISSCC 2023|
|Period||19/02/23 → 23/02/23|
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