30.7 A Crystal-Less BLE Transmitter with −86dBm Freq µ ency-Hopping Back-Channel WRX and Over-the-Air Clock Recovery from a GFSK-Modulated BLE Packet

Alghaihab, Abdullah; Chen, Xing; Shi, Yao; Truesdell, Daniel S.; Calhoun, Benton H.; Wentzloff, David D.

doi:10.1109/isscc19947.2020.9062935

Cited by 8 publications

(5 citation statements)

References 7 publications

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“…Alghaihab et al [20] create a crystal-less BLE transmitter by using two LC oscillators for transmission and reception, respectively. In the transmitter, a clock recovery circuit with an 8 MHz intermediate frequency provides the references for two PLLs.…”

Section: Related Workmentioning

confidence: 99%

QuickCal: Assisted Calibration for Crystal-Free Micromotes

Chang

Watteyne

Maksimovic

et al. 2021

IEEE Internet Things J.

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The Single Chip Micro Mote (SCµM) is a crystalfree single-chip mote that brings us one step closer to the Smart Dust vision, in particular as it can communicate with off-theshelf IEEE802.15.4 and Bluetooth Low Energy devices. However, before it can be part of such networks, the crystal-free SCµM chip needs to be able to accurately tune its communication frequency to synchronize to the network. This is a challenge since its on-board RC and LC-based resonating circuits have a drift rate that can be 3 orders of magnitude worse than crystalbased oscillators typically used in today's radios. This article introduces QuickCal, a solution that allows a SCµM chip to selfcalibrate against off-the-shelf devices dedicated to assisting with its calibration. We show that a SCµM chip can self-calibrate against this QuickCal Box in fewer than 3 min. We further validate that, once it has self-calibrated, a SCµM chip can reliably communicate with off-the-shelf IEEE802.15.4 devices. Finally, we demonstrate a heterogeneous network -composed of a SCµM chip and an OpenMote device -implementing a full 6TiSCH Industrial IoT protocol stack, which uses time synchronization and channel hopping. This is the first time that a crystalfree radio is participating in a channel-hopping enabled TSCH network.

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Section: Related Workmentioning

confidence: 99%

QuickCal: Assisted Calibration for Crystal-Free Micromotes

Chang

Watteyne

Maksimovic

et al. 2021

IEEE Internet Things J.

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“…Table 1 summarizes the trade-off between power and other performance metrics in BLE receivers. The table shows the performance of back-channel BLE receivers in comparison with fully-compliant BLE receivers [36][37][38][39][40][41][42][43][44][45][46][47]. It can be seen that state-of-the-art fully compliant receivers consume around ~2 mW, while BLE back-channel receivers have Mixer-first receivers are another attractive solution to avoid power-hungry active RF gain [28][29][30][31][32][33].…”

Section: Receiver Design Trendsmentioning

confidence: 99%

“…In [57], the high-frequency XO is replaced with a 32 kHz real-time clock (RTC) for frequency calibration and channel selection, while in [58], the XO is replaced with an FBAR resonator. The work in [46,58] reported an XO-less BLE transmitter with clock recovery from GFSK-modulated BLE packets. These designs show that the BLE transmitter is capable of working without a typical MHz-range XO and it not only reduces the overall cost of the BLE module but also introduces some new design insights for BLE beacon transmitters.…”

Section: Reduction Of On-chip/off-chip Componentsmentioning

confidence: 99%

Bluetooth Communication Leveraging Ultra-Low Power Radio Design

Abdelatty

Xing

Alghaihab

et al. 2021

JSAN

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Energy-efficient wireless connectivity plays an important role in scaling both battery-less and battery-powered Internet-of-Things (IoT) devices. The power consumption in these devices is dominated by the wireless transceivers which limit the battery’s lifetime. Different strategies have been proposed to tackle these issues both in physical and network layers. The ultimate goal is to lower the power consumption without sacrificing other important metrics like latency, transmission range and robust operation under the presence of interference. Joint efforts in designing energy-efficient wireless protocols and low-power radio architectures result in achieving sub-100 μW operation. One technique to lower power is back-channel (BC) communication which allows ultra-low power (ULP) receivers to communicate efficiently with commonly used wireless standards like Bluetooth Low-Energy (BLE) while utilizing the already-deployed infrastructure. In this paper, we present a review of BLE back-channel communication and its forms. Additionally, a comprehensive survey of ULP radio design trends and techniques in both Bluetooth transmitters and receivers is presented.

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“…B requires a RX that can adjust its center frequency to the received signal during the reception. Frequency-discrimination RXs [25], [26] extract the frequency from the received signal for the carrier synchronization. The frequency-discrimination technique takes a longer time to extract the frequency to a required precision.…”

Section: B Phase-tracking Receivermentioning

confidence: 99%

A Millimeter-Scale Crystal-Less MICS Transceiver for Insertable Smart Pills

Song

Ding

Tiurin

et al. 2020

IEEE Trans. Biomed. Circuits Syst.

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30.7 A Crystal-Less BLE Transmitter with −86dBm Freq µ ency-Hopping Back-Channel WRX and Over-the-Air Clock Recovery from a GFSK-Modulated BLE Packet

Cited by 8 publications

References 7 publications

QuickCal: Assisted Calibration for Crystal-Free Micromotes

QuickCal: Assisted Calibration for Crystal-Free Micromotes

Bluetooth Communication Leveraging Ultra-Low Power Radio Design

A Millimeter-Scale Crystal-Less MICS Transceiver for Insertable Smart Pills

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