Search results for: D Wentzloff

Items from 1 to 20 out of 66 results

article

Circuit and System Designs of Ultra-Low Power Sensor Nodes With Illustration in a Miniaturized GNSS Logger for Position Tracking: Part II—Data Communication, Energy Harvesting, Power Management, and Digital Circuits

Taekwang Jang, Gyouho Kim, Benjamin Kempke, Michael B. Henry, more

IEEE Transactions on Circuits and Systems I: Regular Papers > 2017 > 64 > 9 > 2250 - 2262

This two-part paper reviews recent innovations in circuit design that have accelerated the miniaturization of sensor nodes. In this second part of the paper, we focus on key building blocks of miniaturized sensor nodes, such as data transceivers, energy harvesters, power management units, and digital logic circuits. System level design considerations are also discussed to provide guidelines for the...

article

Circuit and System Designs of Ultra-Low Power Sensor Nodes With Illustration in a Miniaturized GNSS Logger for Position Tracking: Part I—Analog Circuit Techniques

Taekwang Jang, Gyouho Kim, Benjamin Kempke, Michael B. Henry, more

IEEE Transactions on Circuits and Systems I: Regular Papers > 2017 > 64 > 9 > 2237 - 2249

This paper, split into Parts I and II, reviews recent innovations in circuit design that have accelerated the miniaturization of sensor nodes. Design techniques for key building blocks, such as sensor interfaces, timing reference, data communication, energy harvesting, and power management are reviewed. In particular, Part I introduces analog circuit techniques and sensor interfaces for miniaturized...

chapter

A 335µW −72dBm receiver for FSK back-channel embedded in 5.8GHz Wi-Fi OFDM packets

Jaeho Im, Hun-Seok Kim, David D. Wentzloff

2017 IEEE Radio Frequency Integrated Circuits Symposium (RFIC) > 176 - 179

2017 IEEE Radio Frequency Integrated Circuits Symposium (RFIC)

An ULP back-channel receiver is presented that demodulates binary a FSK back-channel signal embedded in 5.8GHz IEEE 802.11a Wi-Fi OFDM packets. The architecture of the back-channel receiver employs a two-step down-conversion where the first mixing stage downconverts using the 3^rd harmonic of the LO for power efficiency. The LP-65nm CMOS receiver consumes 335µW with a sensitivity of −72dBm at a BER...

chapter

An analysis of phase noise requirements for ultra-low-power FSK radios

Xing Chen, Hun-Seok Kim, David D. Wentzloff

2017 IEEE Radio Frequency Integrated Circuits Symposium (RFIC) > 37 - 40

2017 IEEE Radio Frequency Integrated Circuits Symposium (RFIC)

This paper presents an analysis of the influence of phase noise (PN) on FSK radios and derives the total PN requirement for a low power FSK link based on Bit Error Rate (BER) performance. A simple noise model is built, including phase noise and white noise from the AWGN channel, to analyze its influence on the BER of an ULP FSK RX. It shows that to achieve a 10⁻⁴ BER, the minimum PN requirement can...

article

Energy-Autonomous Wireless Communication for Millimeter-Scale Internet-of-Things Sensor Nodes

Yajing Chen, Nikolaos Chiotellis, Li-Xuan Chuo, Carl Pfeiffer, more

IEEE Journal on Selected Areas in Communications > 2016 > 34 > 12 > 3962 - 3977

This paper presents an energy-autonomous wireless communication system for ultra-small Internet-of-Things (IoT) platforms. In the proposed system, all necessary components, including the battery, energy-harvesting solar cells, and the RF antenna, are fully integrated within a millimeter-scale form factor. Designing an energy-optimized wireless communication system for such a miniaturized platform...

article

Back-Channel Wireless Communication Embedded in WiFi-Compliant OFDM Packets

Hun Seok Kim, David D. Wentzloff

IEEE Journal on Selected Areas in Communications > 2016 > 34 > 12 > 3181 - 3194

This paper presents innovative back-channel wireless communication techniques for ultra-low power (ULP) devices. The concept of embedded back-channel communication is proposed to enable a variety of new applications by inter-connecting heterogeneous ULP devices through existing orthogonal frequency division multiplexing (OFDM)-based WiFi (IEEE 802.11a/g/n/ac) networks. The proposed back-channel communication...

chapter

Software-Defined, WiFi and BLE Compliant Back-Channel for Ultra-Low Power Wireless Communication

Huajun Zhang, David D. Wentzloff, Hun Seok Kim

2016 IEEE Global Communications Conference (GLOBECOM) > 1 - 6

GLOBECOM 2016 - 2016 IEEE Global Communications Conference

In this paper, we present an innovative back-channel wireless communication concept. The proposed back- channel communication enables ultra-low power (ULP) devices that are neither WiFi (IEEE 802.11a/g/n) nor Bluetooth Low Energy (BLE) compliant to receive messages from both WiFi and BLE transmitters. This allows communication between heterogeneous devices beyond the boundary of WiFi and BLE standards...

article

A 10 mm³ Inductive Coupling Radio for Syringe-Implantable Smart Sensor Nodes

Yao Shi, Myungjoon Choi, Ziyun Li, Zhihong Luo, more

IEEE Journal of Solid-State Circuits > 2016 > 51 > 11 > 2570 - 2583

We present a near-field radio system for a millimeter-scale wireless smart sensor node that is implantable through a 14-gauge syringe needle. The proposed system integrates a radio system on chip and a magnetic antenna on a glass substrate within a total dimension of

$1 \times 1 \times 10$

mm³. We demonstrate energy-efficient active near-field wireless communication between the millimeter-scale...

article

Hardware Accelerator for Probabilistic Inference in 65-nm CMOS

Osama U. Khan, David D. Wentzloff

IEEE Transactions on Very Large Scale Integration (VLSI) Systems > 2016 > 24 > 3 > 837 - 845

A hardware accelerator is presented to compute the probabilistic inference for a Bayesian network (BN) in distributed sensing applications. For energy efficiency, the accelerator is operated at a near-threshold voltage of 0.5 V, while achieving a maximum clock frequency of 33 MHz. Clique-tree message passing algorithm is leveraged to compute the probabilistic inference. The theoretical maximum size...

chapter

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

Nathan E. Roberts, Kyle Craig, Aatmesh Shrivastava, Stuart N. Wooters, more

2016 IEEE International Solid-State Circuits Conference (ISSCC) > 450 - 451

2016 IEEE International Solid-State Circuits Conference (ISSCC)

Batteryless operation and ultra-low-power (ULP) wireless communication will be two key enabling technologies as the IC industry races to keep pace with the IoE projections of 1T-connected sensors by 2025. Bluetooth Low-Energy (BLE) is used in many consumer IoE devices now because it offers the lowest average power for a radio that can communicate directly to a mobile device [1]. The BLE standard requires...

article

A 6.45 $\mu{\rm W}$ Self-Powered SoC With Integrated Energy-Harvesting Power Management and ULP Asymmetric Radios for Portable Biomedical Systems

Abhishek Roy, Alicia Klinefelter, Farah B. Yahya, Xing Chen, more

IEEE Transactions on Biomedical Circuits and Systems > 2015 > 9 > 6 > 862 - 874

This paper presents a batteryless system-on-chip (SoC) that operates off energy harvested from indoor solar cells and/or thermoelectric generators (TEGs) on the body. Fabricated in a commercial 0.13 $\mu{\rm W}$ process, this SoC sensing platform consists of an integrated energy harvesting and power management unit (EH-PMU) with maximum power point tracking, multiple sensing modalities, programmable...

chapter

A 300nW near-threshold 187.5–500 kHz programmable clock generator for ultra low power SoCs

Muhammad Faisal, Nathan E. Roberts, David D. Wentzloff

2015 IEEE SOI-3D-Subthreshold Microelectronics Technology Unified Conference (S3S) > 1 - 3

2015 IEEE SOI-3D-Subthreshold Microelectronics Technology Unified Conference (S3S)

We present a 187kHz to 500kHz ADPLL-based clock generator that consumes 300nW from a 0.5V VDD, has a jitter <0.1% and was implemented in a 0.13μm CMOS process. The entire ADPLL was implemented using standard digital design flows and automatic place and route (APR). Moreover, an integrated crystal oscillator (31.25 kHz) is included and serves as the reference for the PLL. Therefore, this is a complete...

article

A 10 mV-Input Boost Converter With Inductor Peak Current Control and Zero Detection for Thermoelectric and Solar Energy Harvesting With 220 mV Cold-Start and $-$ 14.5 dBm, 915 MHz RF Kick-Start

Aatmesh Shrivastava, Nathan E. Roberts, Osama U. Khan, David D. Wentzloff, more

IEEE Journal of Solid-State Circuits > 2015 > 50 > 8 > 1820 - 1832

A boost converter for thermoelectric energy harvesting in 130 nm CMOS achieves energy harvesting from a 10 mV input, which allows wearable body sensors to continue operation with low thermal gradients. The design uses a peak inductor current control scheme and duty cycled, offset compensated comparators to maintain high efficiency across a broad range of input and output voltages. The measured efficiency...

article

8.1 nJ/b 2.4 GHz Short-Range Communication Receiver in 65 nm CMOS

Osama U. Khan, David D. Wentzloff

IEEE Transactions on Circuits and Systems I: Regular Papers > 2015 > 62 > 7 > 1854 - 1862

An 8.1 nJ/bit 2.4 GHz receiver with integrated digital baseband supporting O-QPSK DSSS modulation compliant with the IEEE 802.15.4 standard is presented that targets short-range, Internet of Things applications (IoTs). The sensitivity of a wireless communication receiver in general trades with power consumption. This receiver exploits this tradeoff to achieve a total power consumption of 2.02 mW including...

chapter

A 380µW Rx, 2.6mW Tx 433MHz FSK transceiver with a 102dB link budget and bit-level duty cycling

Nathan E. Roberts, Michael C. Kines, David D. Wentzloff

2015 IEEE Radio Frequency Integrated Circuits Symposium (RFIC) > 171 - 174

2015 IEEE Radio Frequency Integrated Circuits Symposium (RFIC)

This paper presents a low-power, long-range 433MHz transceiver designed for 2-FSK modulation at 1kbps in 8 different physical channels capable of communicating with a Texas Instruments CC1101. Designed in a 130nm CMOS process with an area of 1.1mm², the transmitter's output power is 0dBm and the receiver has a sensitivity of −102dBm producing a link budget >100dB and a theoretical range >5km...

article

Reconfigurable Radios: A Possible Solution to Reduce Entry Costs in Wireless Phones

Mina Rais-Zadeh, Jeremy T. Fox, David D. Wentzloff, Yogesh B. Gianchandani

Proceedings of the IEEE > 2015 > 103 > 3 > 438 - 451

With advances in telecommunications, an increasing number of services rely on high data rate spectrum access. These critical services include banking, telemedicine, and exchange of technical information. As a result, spectrum resources are in ever-greater demand and the radio spectrum has become overly crowded. For efficient usage of spectrum, smart or cognitive radios are sought after. However, current...

chapter

5.4 A 32nW bandgap reference voltage operational from 0.5V supply for ultra-low power systems

Aatmesh Shrivastava, Kyle Craig, Nathan E. Roberts, David D. Wentzloff, more

2015 IEEE International Solid-State Circuits Conference - (ISSCC) Digest of Technical Papers > 1 - 3

2015 IEEE International Solid- State Circuits Conference - (ISSCC)

Most systems require a voltage reference independent of variation of power supply, process, or temperature, and a bandgap voltage reference (BGR) often serves this purpose. For ultra-low power (ULP) systems, the BGR may constitute a significant component of standby power, and the system start-up voltage is often determined by the voltage, V_in, at which the BGR becomes operational. Lowering V_in can...

chapter

21.3 A 6.45μW self-powered IoT SoC with integrated energy-harvesting power management and ULP asymmetric radios

Alicia Klinefelter, Nathan E. Roberts, Yousef Shakhsheer, Patricia Gonzalez, more

2015 IEEE International Solid-State Circuits Conference - (ISSCC) Digest of Technical Papers > 1 - 3

2015 IEEE International Solid- State Circuits Conference - (ISSCC)

A 1 trillion node internet of things (IoT) will require sensing platforms that support numerous applications using power harvesting to avoid the cost and scalability challenge of battery replacement in such large numbers. Previous SoCs achieve good integration and even energy harvesting [1][2][3], but they limit supported applications, need higher end-to-end harvesting efficiency, and require duty-cycling...

chapter

A 5mW 250MS/s 12-bit synthesized digital to analog converter

Elnaz Ansari, David D. Wentzloff

Proceedings of the IEEE 2014 Custom Integrated Circuits Conference > 1 - 4

2014 IEEE Custom Integrated Circuits Conference - CICC 2014

Design automation of analog circuits is becoming inevitable as CMOS technology scales, mainly because the extensive amount of design rule checks cannot be easily handled by manual analog design approaches. This paper presents a low-power 12-bit, 250MS/s digital-to-analog converter (DAC) completely implemented using standard digital design flows and automatic place and route (APR). This is a current-steering...

article

Characterization of the Proximity Effect From Tungsten TSVs on 130-nm CMOS Devices in 3-D ICs

Sangwook Han, David D. Wentzloff

IEEE Transactions on Very Large Scale Integration (VLSI) Systems > 2014 > 22 > 9 > 2025 - 2029

The proximity effect of tungsten-filled through-silicon-vias (TSVs) on the threshold voltage and mobility of CMOS devices due to mismatch in thermal expansion coefficients is modeled and verified with measurements. Test structures fabricated in a two-layer 130-nm CMOS 3-D integrated circuit process are measured and compared with 3-D finite element method simulations. Results show that the threshold...

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RECEIVERS (17)
CMOS INTEGRATED CIRCUITS (14)
WIRELESS SENSOR NETWORKS (12)
WIRELESS COMMUNICATION (11)
RADIO FREQUENCY (10)
SENSITIVITY (9)
ULTRA WIDEBAND COMMUNICATION (6)
CALIBRATION (5)
CAPACITORS (5)
CLOCKS (5)
FREQUENCY SHIFT KEYING (5)
INTERNET OF THINGS (5)
RADIO TRANSMITTERS (5)
BANDWIDTH (4)
BASEBAND (4)
CMOS PROCESS (4)
ENERGY HARVESTING (4)
FREQUENCY MEASUREMENT (4)
LAYOUT (4)
OSCILLATORS (4)
PHASE LOCKED LOOPS (4)
RECTIFIERS (4)
SYNCHRONIZATION (4)
ANALOG INTEGRATED CIRCUITS (3)
ANTENNAS (3)
BATTERIES (3)
BODY AREA NETWORKS (3)
CMOS (3)
COUPLINGS (3)
INTEGRATED CIRCUIT MODELING (3)
LOW-POWER ELECTRONICS (3)
OFDM (3)
PATCH ANTENNAS (3)
RESISTORS (3)
RING OSCILLATORS (3)
SIZE 0.13 MUM (3)
SIZE 65 NM (3)
STANDARDS (3)
SYSTEM-ON-A-CHIP (3)
SYSTEM-ON-CHIP (3)
TRANSMITTERS (3)
TUNING (3)
ULTRA-LOW POWER (3)
UWB (3)
WIRELESS SENSOR NETWORKS (WSNS) (3)
ACTIVE ENERGY CONSUMPTION (2)
ADPLLS (2)
BIT ERROR RATE (2)
CHANNEL MODELING (2)
CLOCK-HARVESTING RECEIVER (CRX) (2)
CMOS TECHNOLOGY (2)
COILS (2)
COMPUTER ARCHITECTURE (2)
DATA ACQUISITION (2)
DELAY (2)
DELAY LINES (2)
DIGITAL STANDARD CELLS (2)
DIGITALLY CONTROLLED OSCILLATOR (2)
ENERGY EFFICIENCY (2)
EQUATIONS (2)
FIELD EFFECT MIMIC (2)
FREQUENCY 60 GHZ (2)
FREQUENCY LOCKED LOOPS (2)
FSK (2)
GAIN (2)
GNSS (2)
GREEN COMMUNICATIONS (2)
GSM (2)
HARDWARE (2)
IEEE 802.11 STANDARD (2)
IMAGE EDGE DETECTION (2)
INTEGRATED CIRCUITS (2)
IOT (2)
MATHEMATICAL MODEL (2)
MICROSTRIP ANTENNAS (2)
MILLIMETRE WAVE ANTENNAS (2)
ON-CHIP PATCH ANTENNA (2)
PHASE-LOCKED LOOPS (2)
PHOTONIC BAND GAP (2)
PLACED-AND-ROUTED (2)
POWER DEMAND (2)
PULSE POSITION MODULATION (2)
PULSE WIDTH MODULATION (2)
RADIO RECEIVERS (2)
RESONANT INDUCTIVE COUPLING (2)
SENSOR NODE (2)
SIMULATION (2)
STANDARD CELL LIBRARY (2)
SUB-NYQUIST ADC (2)
SWITCHES (2)
SYNTHESIS (2)
TEMPERATURE MEASUREMENT (2)
TESTING (2)
THREE-DIMENSIONAL INTEGRATED CIRCUITS (2)
TRANSCEIVERS (2)
TRANSISTORS (2)
WAKE-UP RECEIVER (WRX) (2)
WAKEUP RADIO (2)
WIRELESS SENSOR NODE (2)
2.4 GHZ ISM BAND (1)
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Search results for: D Wentzloff

Circuit and System Designs of Ultra-Low Power Sensor Nodes With Illustration in a Miniaturized GNSS Logger for Position Tracking: Part II—Data Communication, Energy Harvesting, Power Management, and Digital Circuits

Circuit and System Designs of Ultra-Low Power Sensor Nodes With Illustration in a Miniaturized GNSS Logger for Position Tracking: Part I—Analog Circuit Techniques

A 335µW −72dBm receiver for FSK back-channel embedded in 5.8GHz Wi-Fi OFDM packets

An analysis of phase noise requirements for ultra-low-power FSK radios

Energy-Autonomous Wireless Communication for Millimeter-Scale Internet-of-Things Sensor Nodes

Back-Channel Wireless Communication Embedded in WiFi-Compliant OFDM Packets

Software-Defined, WiFi and BLE Compliant Back-Channel for Ultra-Low Power Wireless Communication

A 10 mm³ Inductive Coupling Radio for Syringe-Implantable Smart Sensor Nodes

Hardware Accelerator for Probabilistic Inference in 65-nm CMOS

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

A 6.45 $\mu{\rm W}$ Self-Powered SoC With Integrated Energy-Harvesting Power Management and ULP Asymmetric Radios for Portable Biomedical Systems

A 300nW near-threshold 187.5–500 kHz programmable clock generator for ultra low power SoCs

A 10 mV-Input Boost Converter With Inductor Peak Current Control and Zero Detection for Thermoelectric and Solar Energy Harvesting With 220 mV Cold-Start and $-$ 14.5 dBm, 915 MHz RF Kick-Start

8.1 nJ/b 2.4 GHz Short-Range Communication Receiver in 65 nm CMOS

A 380µW Rx, 2.6mW Tx 433MHz FSK transceiver with a 102dB link budget and bit-level duty cycling

Reconfigurable Radios: A Possible Solution to Reduce Entry Costs in Wireless Phones

5.4 A 32nW bandgap reference voltage operational from 0.5V supply for ultra-low power systems

21.3 A 6.45μW self-powered IoT SoC with integrated energy-harvesting power management and ULP asymmetric radios

A 5mW 250MS/s 12-bit synthesized digital to analog converter

Characterization of the Proximity Effect From Tungsten TSVs on 130-nm CMOS Devices in 3-D ICs

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