A. Kiavar
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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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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.