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Your search keyword '"Visser, A. J."' showing total 99 results
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99 results on '"Visser, A. J."'

5. An Energy-Efficient and High-Data-Rate IR-UWB Transmitter for Intracortical Neural Sensing Interfaces.

Author

Song, Minyoung, Huang, Yu, Visser, Hubregt J., Romme, Jac, and Liu, Yao-Hong

Subjects
BRAIN-computer interfaces, TELEMETRY, PHASE shift keying, PULSE amplitude modulation, NEUROTRANSMITTERS, MONOPOLE antennas
Abstract

This article presents an implantable impulse-radio ultra-wideband (IR-UWB) wireless telemetry system for intracortical neural sensing interfaces. A 3-D hybrid impulse modulation that comprises phase shift keying (PSK), pulse position modulation (PPM), and pulse amplitude modulation (PAM) is proposed to increase modulation order without significantly increasing the demodulation requirement, thus leading to a high data rate of 1.66 Gbps and an increased air-transmission range. Operating in a 6–9-GHz UWB band, the presented transmitter (TX) supports the proposed hybrid modulation with a high energy efficiency of 5.8 pJ/bit and modulation quality [error vector magnitude (EVM) < −21 dB]. A low-noise injection-locked ring oscillator (ILRO) supports 8-PSK with a phase error of 2.6°. A calibration-free delay generator realizes a 4-PPM with only $115~\mu \text{W}$ and avoids potential cross-modulation between PPM and PSK. A switch-cap power amplifier (PA) with asynchronous pulse-shaping performs 4-PAM with high energy efficiency and linearity. The TX is implemented in 28-nm CMOS technology, occupying a 0.155 mm2 core area. The wireless module including a printed monopole antenna has a module area of only 1.05 cm2. The TX consumes in total 9.7 mW when transmitting −41.3-dBm/MHz output power. The wireless telemetry module has been validated ex-vivo with a 15-mm multi-layer porcine tissue, and achieves a communication (air) distance up to 15 cm, leading to at least $16\times $ improvement in distance-moralized energy efficiency of 45 pJ/bit/m compared to a state-of-the-art. [ABSTRACT FROM AUTHOR]

Published
2022
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19. A Millimeter-Scale Crystal-Less MICS Transceiver for Insertable Smart Pills.

Author

Song, Minyoung, Ding, Ming, Tiurin, Evgenii, Xu, Kai, Allebes, Erwin, Singh, Gaurav, Zhang, Peng, Visser, Hubregt J., Aminzadeh, Reza, Joseph, Wout, Martens, Luc, Van Helleputte, Nick, Bachmann, Christian, and Liu, Yao-Hong

Abstract

This paper presents a millimeter-scale crystal-less wireless transceiver for volume-constrained insertable pills. Operating in the 402–405 MHz medical implant communication service (MICS) band, the phase-tracking receiver-based over-the-air carrier recovery has a ±160 ppm coverage. A fully integrated adaptive antenna impedance matching solution is proposed to calibrate the antenna impedance variation inside the body. A tunable matching network (TMN) with single inductor performs impedance matching for both transmitter (TX) and receiver (RX) and TX/RX mode switching. To dynamically calibrate the antenna impedance variation over different locations and diet conditions, a loop-back power detector using self-mixing is adopted, which expands the power contour up to 4.8 VSWR. The transceiver is implemented in a 40-nm CMOS technology, occupying 2 mm2 die area. The transceiver chip and a miniature antenna are integrated in a 3.5 × 15 mm2 area prototype wireless module. It has a receiver sensitivity of −90 dBm at 200 kbps data rate and delivers up to − 25 dBm EIRP in the wireless measurement with a liquid phantom. [ABSTRACT FROM AUTHOR]

Published
2020
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