A study of low-power crystal oscillator design

Lee, Kin Keung; Granhaug, Kristian; Andersen, Nikolaj

doi:10.1109/norchip.2013.6702036

Cited by 8 publications

(3 citation statements)

References 3 publications

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“…The average current is about 116.10 𝜇A, as shown in Figure 10d. Most of the power is dissipated by the oscillator, so further optimizations can be made through advanced IC techniques [33,36].…”

Section: Methodsmentioning

confidence: 99%

Content-agnostic backscatter from thin air

Yang

Yuan

Zhao

et al. 2022

Proceedings of the 20th Annual International Conference on Mobile Systems, Applications and Services

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We present CAB, a content-agnostic backscatter system that can demodulate both tag and ambient data from ambient backscattered WiFi alone. In contrast to prior ambient backscatter systems that use ambient data (content) as tag-data carriers, we focus on zerosubcarriers, which are invariant and independent for any ambient OFDM WiFi. The idea of using zero-subcarriers to convey tag data is simple and elegant. Not only does it for the first time remove the dependency of tag-data demodulation on ambient data, but it also significantly improves the practicality of ambient backscatter.We prototype CAB using off-the-shelf FPGAs and SDRs. Extensive experiments show CAB is universal as it can work with multi-band, multi-stream, and multi-user ambient traffic, including WiFi 3/4/5/6. CAB is also high-performing since it can deliver 340.9 Mbps aggregate throughput, reaching 97% Shannon capacity. Since CAB is general, we extend it to leverage ambient LTE traffic as excitations, and the achieved tag-data BER is below 0.002%. As the first content-agnostic backscatter that delivers near Shannoncapacity throughput, we believe CAB takes a curial step forward on ubiquitous battery-free IoTs. CCS CONCEPTS• Networks → Network design principles; Sensor networks.

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Section: Methodsmentioning

confidence: 99%

Content-agnostic backscatter from thin air

Yang

Yuan

Zhao

et al. 2022

Proceedings of the 20th Annual International Conference on Mobile Systems, Applications and Services

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“…In particular, one attractive design for an ultra-low power oscillator is a ring oscillator, which is used in some integrated digital and communication systems [28] [46] [32]. Our design of a 20MHz ring oscillator looks as shown in Figure 8.…”

Section: Can We Shift By 20mhz While Consuming µWs?mentioning

confidence: 99%

Enabling Practical Backscatter Communication for On-body Sensors

Zhang

Rostami

et al. 2016

Proceedings of the 2016 ACM SIGCOMM Conference

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127

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In this paper, we look at making backscatter practical for ultra-low power on-body sensors by leveraging radios on existing smartphones and wearables (e.g. WiFi and Bluetooth). The difficulty lies in the fact that in order to extract the weak backscattered signal, the system needs to deal with self interference from the wireless carrier (WiFi or Bluetooth) without relying on built-in capability to cancel or reject the carrier interference.Frequency-shifted backscatter (or FS-Backscatter) is based on a novel idea -the backscatter tag shifts the carrier signal to an adjacent non-overlapping frequency band (i.e. adjacent WiFi or Bluetooth band) and isolates the spectrum of the backscattered signal from the spectrum of the primary signal to enable more robust decoding. We show that this enables communication of up to 4.8 meters using commercial WiFi and Bluetooth radios as the carrier generator and receiver. We also show that we can support a range of bitrates using packet-level and bit-level decoding methods. We build on this idea and show that we can also leverage multiple radios typically present on mobile and wearable devices to construct multi-carrier or multi-receiver scenarios to improve robustness. Finally, we also address the problem of designing an ultra-low power tag that can frequency shift by 20MHz while consuming tens of micro-watts. Our results show that FS-Backscatter is practical in typical mobile and static on-body sensing scenarios while only using commodity radios and antennas.

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“…This is due to the narrowband CW signals that may experience selectively channels, and to different reader-tag distances 10. An example of ad-hoc oscillator for tags based on UWB backscattering has been presented in[41].…”

mentioning

confidence: 99%

Passive UWB RFID for Tag Localization: Architectures and Design

2016

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International audienceIn the new scenarios foreseen by the Internet of Things, industrial and commercial systems will be required to detect and localize tagged items with high accuracy, as well as to monitor the level of certain parameters of interest through the deployment of wireless sensors. To meet these challenging requirements, the adoption of passive and semi-passive ultra-wideband (UWB) radio-frequency identification (RFID) appears a promising solution which overcomes the limitations of standard Gen.2 ultra-high frequency (UHF) RFID. The design and implementation of such systems pose several practical constraints, impacting the overall network architecture. In this paper, the main issues and challenging aspects for the design of a UWB-RFID network considering architectural and protocol choices are discussed in a unitary framework, and practical solutions, accounting for the presented issues, are proposed. Moreover, the possible integration of UWB-RFID with standard Gen.2 UHF-RFID is proposed as an interesting option, discussing architectural solutions, their advantages and drawbacks

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A study of low-power crystal oscillator design

Cited by 8 publications

References 3 publications

Content-agnostic backscatter from thin air

Content-agnostic backscatter from thin air

Enabling Practical Backscatter Communication for On-body Sensors

Passive UWB RFID for Tag Localization: Architectures and Design

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