Bio-WiTel: A Low-Power Integrated Wireless Telemetry System for Healthcare Applications in 401–406 MHz Band of MedRadio Spectrum

Srivastava, Abhishek; Sankar, K Nithin; Chatterjee, Baibhab; Das, Devarshi Mrinal; Ahmad, Meraj; Kukkundoor, Rakesh Keshava; Saraf, Vivek; Ananthapadmanabhan, J.; Sharma, Dinesh K.; Baghini, Maryam Shojaei

doi:10.1109/jbhi.2016.2639587

Cited by 21 publications

(4 citation statements)

References 22 publications

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“…Post-layout simulation, including parasitic models inside and outside the chip, has been performed for this purpose. The model presented in Srivastava et al 49 has been used to address the package and PCB parasitic. The layout of the transmitter circuit and the parasitic models of off-chip elements are shown in Meanwhile, layout parasitic reduces the oscillation frequency, which can be compensated by calibration (Figure 13A)-the pad's capacitance and bonding wire inductance resonant at 10 GHz.…”

Section: Post-layout Simulationmentioning

confidence: 99%

Optimal sub‐harmonic injection‐locked MICS band transmitter for wireless CW‐fNIRS systems

Borjkhani

Setarehdan

Sheikhaei

2021

Circuit Theory & Apps

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Portable and wireless functional near-infrared spectroscopy is a growing field of research for real-time monitoring of brain functions. The most critical challenges in this field are the use of low-power and calibrated circuits. A novel transmitter architecture is proposed to overcome these barriers. This transmitter is low power, capable of being calibrated against process variation, and has a better phase noise and spurious-free dynamic range (SFDR) at the antenna. Besides that, the transmitter can be calibrated, which is not seen in similar research. In this transmitter, injection locking and frequency calibration lead to having an optimal and low-power circuit. The circuit is capable of transmitting data with BFSK and OOK modulations in the frequency band of the medical implant communication service (MICS). The transmitter is designed and simulated in a typical CMOS 0.18-μm technology with a 1-V power supply. The transmitter's power consumption is around 146 and 123 μW, equal to 5.92 nJ/bit and 246-630 pJ/bit for BFSK and OOK modulations, respectively. The signal's phase noise at the antenna is almost À109 dBc/Hz at 1-MHz frequency offset.

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Section: Post-layout Simulationmentioning

confidence: 99%

Optimal sub‐harmonic injection‐locked MICS band transmitter for wireless CW‐fNIRS systems

Borjkhani

Setarehdan

Sheikhaei

2021

Circuit Theory & Apps

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“…Currently, healthcare devices have attracted the interest of many antenna designers [1][2][3][4]. The continuous monitoring of a patient can interfere with the freedom of movement, which complicates the use of continuous monitoring.…”

Section: Introductionmentioning

confidence: 99%

Wearable Flexible Antenna for UWB On-Body and Implant Communications

Särestöniemi

Sonkki

Myllymäki

et al. 2021

Telecom

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This paper describes the development and evaluation of an on-body flexible antenna designed for an in-body application, as well as on-body communications at ISM and UWB frequency bands. The evaluation is performed via electromagnetic simulations using the Dassault Simulia CST Studio Suite. A planar tissue layer model, as well as a human voxel model from the human abdominal area, are used to study the antenna characteristics next to human tissues. Power flow analysis is presented to understand the power flow on the body surface as well as within the tissues. Simulation results show that this wearable flexible antenna is suitable for in-body communications in the intestinal area, e.g., for capsule endoscopy, in the industrial, scientific, and medical (ISM) band and at lower ultra-wideband (UWB). At higher frequencies, the antenna is suitable for on-body communications as well as in-body communications with lower propagation depth requirements. Additionally, an antenna prototype has been prepared and the antenna performance is verified with several on-body measurements. The measurement results show a good match with the simulation results. The novelty of the proposed antenna is a compact size and the flexible substrate material, which makes it feasible and practical for several different medical diagnosis and monitoring applications.

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“…The MedRadio rule was amended later in 2011 to allow networking of the devices and controllers and referred to as a medical micropower network (MMN) [ 2 ]. Since then, numerous implanted and wearable medical devices equipped with the MedRadio RF transceiver have been reported in literature, such as a wireless bio-signal monitoring system [ 3 ], an implanted cardiac defibrillator [ 4 ], an implanted pacemaker [ 5 ], an intraocular pressure monitoring system [ 6 ], physiological state monitoring prosthetic teeth [ 7 , 8 ], wireless position sensing system in total hip replacement surgery [ 9 ], capsule endoscopy [ 10 , 11 ], and so on.…”

Section: Introductionmentioning

confidence: 99%

A CMOS RF Receiver with Improved Resilience to OFDM-Induced Second-Order Intermodulation Distortion for MedRadio Biomedical Devices and Sensors

Lee

Chang

Kim

et al. 2021

Sensors

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A MedRadio RF receiver integrated circuit for implanted and wearable biomedical devices must be resilient to the out-of-band (OOB) orthogonal frequency division modulation (OFDM) blocker. As the OFDM is widely adopted for various broadcasting and communication systems in the ultra-high frequency (UHF) band, the selectivity performance of the MedRadio RF receiver can severely deteriorate by the second-order intermodulation (IM2) distortion induced by the OOB OFDM blocker. An analytical investigation shows how the OFDM-induced IM2 distortion power can be translated to an equivalent two-tone-induced IM2 distortion power. It makes the OFDM-induced IM2 analysis and characterization process for a MedRadio RF receiver much simpler and more straightforward. A MedRadio RF receiver integrated circuit with a significantly improved resilience to the OOB IM2 distortion is designed in 65 nm complementary metal-oxide-semiconductor (CMOS). The designed RF receiver is based on low-IF architecture, comprising a low-noise amplifier, single-to-differential transconductance stage, quadrature passive mixer, trans-impedance amplifier (TIA), image-rejecting complex bandpass filter, and fractional phase-locked loop synthesizer. We describe design techniques for the IM2 calibration through the gate bias tuning at the mixer, and the dc offset calibration that overcomes the conflict with the preceding IM2 calibration through the body bias tuning at the TIA. Measured results show that the OOB carrier-to-interference ratio (CIR) performance is significantly improved by 4–11 dB through the proposed IM2 calibration. The measured maximum tolerable CIR is found to be between −40.2 and −71.2 dBc for the two-tone blocker condition and between −70 and −77 dBc for the single-tone blocker condition. The analytical and experimental results of this work will be essential to improve the selectivity performance of a MedRadio RF receiver against the OOB OFDM-blocker-induced IM2 distortion and, thus, improve the robustness of the biomedical devices in harsh wireless environments in the MedRadio and UHF bands.

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Bio-WiTel: A Low-Power Integrated Wireless Telemetry System for Healthcare Applications in 401–406 MHz Band of MedRadio Spectrum

Cited by 21 publications

References 22 publications

Optimal sub‐harmonic injection‐locked MICS band transmitter for wireless CW‐fNIRS systems

Optimal sub‐harmonic injection‐locked MICS band transmitter for wireless CW‐fNIRS systems

Wearable Flexible Antenna for UWB On-Body and Implant Communications

A CMOS RF Receiver with Improved Resilience to OFDM-Induced Second-Order Intermodulation Distortion for MedRadio Biomedical Devices and Sensors

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