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Over-the-Air Frequency Calibration for Crystal-Less BLE Nodes Achieving ±20 ppm Accuracy at -23 dB SIR

Conference Paper (2026)
Author(s)

Amir Arsalan Kiavar (TU Delft - Electrical Engineering, Mathematics and Computer Science)

Niels Fakkel (TU Delft - QCD/Babaie Lab)

Masoud Babaie (TU Delft - Electrical Engineering, Mathematics and Computer Science, TU Delft - QCD/Babaie Lab)

Research Group
Electronics
DOI related publication
https://doi.org/10.1109/CICC65509.2026.11509497 Final published version
More Info
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Publication Year
2026
Language
English
Research Group
Electronics
Publisher
IEEE
ISBN (electronic)
9798331572105
Event
46th Annual IEEE Custom Integrated Circuits Conference, CICC 2026 (2026-04-19 - 2026-04-23), Seattle, United States
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Abstract

Bluetooth Low Energy (BLE) powers large-scale Internet-of-Things networks but remains constrained by costly off-chip crystal oscillators. This work presents a 730 μW over-the-air frequency calibration technique that compares the energy of the upper and lower sidebands of a received BLE-compliant signal to calibrate the frequency accuracy of an on-chip LC oscillator from ±340 ppm to ±20 ppm within a 1.1 ms calibration period, while maintaining robust operation under a -23 dB signal-to-interference ratio at the adjacent channel.

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