26.8 A 236nW −56.5dBm-sensitivity bluetooth low-energy wakeup receiver with energy harvesting in 65nm CMOS

Roberts, Nathan E.; Craig, Kyle; Shrivastava, Aatmesh; Wooters, Stuart N.; Shakhsheer, Yousef; Calhoun, Benton H.; Wentzloff, David D.

doi:10.1109/isscc.2016.7418101

Cited by 82 publications

(52 citation statements)

References 3 publications

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“…In addition, this figure also shows the best reported fullyintegrated RF wake-on-radio circuits (triangles): Jiang'17 [6], Robert'16 [7], Zgaren'15 [8], Oh'13 [9], and Cho'08 [10]. The highest wake-up sensitivity is achieved in [6], with a combination of an integrated transformer and a powered voltage amplifier, with a quiescent power of 4.5 nW.…”

Section: Comparison With State Of the Art And Conclusionmentioning

confidence: 95%

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A 10 nW, 10 mV signal detector using a 2 pA standby voltage reference, for always-on sensors and receivers

Adami

Yang

Zhang

et al. 2018

2018 IEEE Applied Power Electronics Conference and Exposition (APEC)

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An RF energy harvesting circuit is usually designed to maximise efficiency and therefore output power, while a passive wake-up radio is usually optimised for a high open-circuit output voltage resulting in high sensitivity. These two functions have conflicting design requirements, but are generally both needed in Internet-of-Things devices. This paper presents a new approach to holding almost the entire system fully powered down whilst listening, whilst also obtaining an effective wake-up and energy harvesting circuit using the same rectenna (rectifying antenna). The topology uses a rectenna that is optimised for efficiency, and two signal detector circuits that draw up to 3.5 nA from the battery. One detector is configured to trigger at 85 mV, to start up the boost converter when enough power is available to obtain netpositive energy harvesting. The other detector is set to be more sensitive, to wake up subsystems when the rectenna output reaches 10 mV. The detector architecture and transistor-level design are presented, and the detection threshold and power levels experimentally verified. The circuit draws 10 nW at a sensitivity of 10 mV, and 3.9 nW at 85 mV. This detection system is the first reported circuit with a configurable detection threshold that draws only nW from the battery, and that, in addition to RF signals, can be used with any transient signals, such as outputs from piezoelectric sensors, microphones, or energy harvesters that produce in excess of around 10 mV. The low power consumption of this circuit is largely due to use of the UB20M voltage detector, whose internal on-demand voltage reference generator is also reported here. It has the lowest reported standby current of 2 pA, and a sub-microsecond-scale turn-on response time.

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Section: Comparison With State Of the Art And Conclusionmentioning

confidence: 95%

“…14 (dots). [6], Robert'16 [7], Zgaren'15 [8], Oh'13 [9], Oh'12 [3], Cho'08 [10]) and a commercial low-power comparator (LTC1540).…”

Section: Comparison With State Of the Art And Conclusionmentioning

confidence: 99%

A 10 nW, 10 mV signal detector using a 2 pA standby voltage reference, for always-on sensors and receivers

Adami

Yang

Zhang

et al. 2018

2018 IEEE Applied Power Electronics Conference and Exposition (APEC)

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“…Maximum power point tracking (MPPT) technique is widely applied to power management unit (PMU) in energy harvesting system [1]. Since the MPPT enables the PMU to extract maximum available power from energy harvesting devices (EHDs), electronic device powered by this PMU can operate with extended lifetime or even without a battery [2,3,4,5]. Perturb & observe method (P&O) and fractional open circuit voltage method (FOCV) are the most frequently used MPPT techniques in energy harvesting systems [6,7].…”

Section: Introductionmentioning

confidence: 99%

A fast maximum power point tracking boost converter with 80 ns sampling and tracking time for energy harvesting application

Lee

Jeong

2019

IEICE Electron. Express

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In this letter, a continuous conduction mode boost converter with fast and efficient maximum power point tracking (MPPT) is presented for energy harvesting application. A novel current conservation technique is utilized to sample open-circuit voltage of energy harvesting device without any unnecessary power loss during MPPT operation. Fabricated in 0.35 µm CMOS process, the proposed converter achieves a sampling and tracking time of 80 ns for MPPT. Also, the converter has a peak tracking efficiency of 97.2% and a peak power conversion efficiency of 84.8% with 3-V output voltage.

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“…Simple energy detection architecture appears as the best candidate for low power wake-up receivers especially in the nanowatt power consumption. However, Bluetooth Low Energy (BLE)-compliant wake-up systems utilizing energy detection such as [1] and [2] are limited in sensitivity. The work in [1] achieves 236nW consumption while the sensitivity is limited to -56dBm.…”

Section: Introductionmentioning

confidence: 99%

“…However, Bluetooth Low Energy (BLE)-compliant wake-up systems utilizing energy detection such as [1] and [2] are limited in sensitivity. The work in [1] achieves 236nW consumption while the sensitivity is limited to -56dBm. It is targeted for latency in the order of seconds where each packet constitutes only one symbol of information.…”

Section: Introductionmentioning

confidence: 99%

A −80dBm BLE-compliant, FSK wake-up receiver with system and within-bit dutycycling for scalable power and latency

Abdelhamid

Paidimarri

Chandrakasan

2018

2018 IEEE Custom Integrated Circuits Conference (CICC)

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26.8 A 236nW −56.5dBm-sensitivity bluetooth low-energy wakeup receiver with energy harvesting in 65nm CMOS

Cited by 82 publications

References 3 publications

A 10 nW, 10 mV signal detector using a 2 pA standby voltage reference, for always-on sensors and receivers

A 10 nW, 10 mV signal detector using a 2 pA standby voltage reference, for always-on sensors and receivers

A fast maximum power point tracking boost converter with 80 ns sampling and tracking time for energy harvesting application

A −80dBm BLE-compliant, FSK wake-up receiver with system and within-bit dutycycling for scalable power and latency

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