scholarly journals Electronic controlled CMOS inductor with patterned metal ground shields for fine inductance tuning application

2019 ◽  
Vol 14 (2) ◽  
pp. 937 ◽  
Author(s):  
Nur Syahadah Yusof ◽  
Norlaili Mohd Noh ◽  
Jagadheswaran Rajendran ◽  
Asrulnizam Abd Manaf ◽  
Shukri Korakkottil Kunhi Mohd ◽  
...  
Keyword(s):  
Process Design ◽  
Tuning Range ◽  
Electronic Circuit ◽  
The Other ◽  
Fine Tuning ◽  
Q Factor ◽  
Analog To Digital ◽  
Metal Plates ◽  
Physical Shape ◽  
Ground Shield

This paper is on an inductance fine tuning technique which benefits from the idea of varying the number of metal plates of an inductor’s pattern ground shield (PGS) shorted to ground to change its magnetic fields. This technique is unique because the geometry and physical shape of the inductor remains untouched from its form in the process design kit (PDK) while the inductance is being tuned. The number of metal shields shorted to ground was controlled by an electronic circuit which consists of analog-to-digital converters and active switches. Both Sonnet EM simulator and Cadence Virtuoso were used for the inductor and circuit simulations. From the simulation, it was found that the inductance increased while the Q-factor decreased as more metal shields were shorted to ground. For instance, at 1.6 GHz, the simulated inductance was 8.8 nH when all metals were floated and 9.4 nH when all metals were shorted to ground. On the other hand, the simulated Q-factor was 10.4 when all metals were floated and 9.8 when all metals were shorted to ground. From both simulation and measured results, both inductance and inductance tuning range increased with frequency. From the measured results too, the inductance observed was 9.4 nH at 1.6 GHz, 10.8 nH at 2 GHz, and 13.5 nH at 2.5 GHz when all the metal shields were shorted to ground. The inductance tuning range was 6.2% at 1.6 GHz, 12.5% at 2 GHz, and 20% at 2.5 GHz. The measured results showed good correlation with the simulated results trend, but with smaller value of inductance, inductance tuning range and Q-factor.

Signal-Adaptive Analog-to-Digital Converters for ULP Wearable and Implantable Medical Devices

2016 ◽  
pp. 199-228 ◽  
Author(s):  
Nabi Sertac Artan
Keyword(s):  
Low Power ◽  
Medical Devices ◽  
Sar Adc ◽  
The Other ◽  
Implantable Medical Devices ◽  
Ultra Low Power ◽  
Analog To Digital ◽  
Electrophysiological Signals ◽  
Recent Developments ◽  
Adc Architectures

The mission of this chapter is to introduce the reader the recent developments in the design of ultra-Low Power ADCs for Wearable and Implantable Medical Devices (WIMDs). The focus of this chapter will be on Signal-Adaptive Successive Approximation Register (SAR) ADC architectures and their derivatives, since the majority of the ULP medical devices rely on these architectures. The proposed chapter first provides an overview of the WIMDs, and electrophysiological signals. Then, basic SAR ADCs are introduced followed by the study of adaptive SAR ADCs. The chapter concludes with a brief summary of the other prevalent ADC architecture for WIMDs, namely the Level-Crossing ADCs.

Patterned Ground Shield for Inductance Fine-tuning

2020 ◽  
pp. 1-15
Author(s):  
Nur S. Yusof ◽  
Norlaili M. Noh ◽  
Jagadheswaran Rajendran ◽  
Asrulnizam A. Manaf ◽  
Yusman M. Yusof ◽  
...  
Keyword(s):  
Fine Tuning ◽  
Patterned Ground ◽  
Patterned Ground Shield ◽  
Ground Shield

Simulations in orthopedics and rehabilitation – Part I: Simulators

2016 ◽  
Vol 12 (4) ◽  
Author(s):  
Jacek Dygut ◽  
Piotr Piwowar ◽  
Maria Gołda ◽  
Krzysztof Popławski ◽  
Robert Jakubas ◽  
...  
Keyword(s):  
Computer Simulation ◽  
The Other ◽  
Fine Tuning ◽  
Patient Treatment ◽  
Biological Processes ◽  
Clinical Environment ◽  
Knowledge And Skills ◽  
Simulation Techniques ◽  
Resident Physicians ◽  
Different Types

AbstractNowadays, medical simulators and computer simulation programs are used to train various skills required in medicine. The development of medicine, including orthopedics and rehabilitation, has meant that resident physicians, within a much shorter period of time, must acquire the knowledge and skills that their older colleagues gained over years, learning as they operated on patients. For this reason, simulation very often helps the doctor and others engaged in health care train some techniques necessary during the work before they start working in a clinical environment. They have a chance of fine-tuning certain skills under nonclinical environment. On the other hand, simulation techniques are used in medical scientific research to know and explain the different biological processes that can be used for better patient treatment in the future. In this paper (Part I), the authors focused on the presentation of different types of simulators for the following purposes: test (conducted under laboratory conditions), training (incorporated into school, universities syllabus), diagnostic and therapeutic (within the hospital, clinics, private medical practice).

Leakage from Electrified Metal Plates and Points placed above and below Uninsulated Flames

1899 ◽  
Vol 22 ◽  
pp. 38-46
Author(s):  
Lord Kelvin ◽  
Magnus Maclean
Keyword(s):  
Electrical Properties ◽  
Copper Plate ◽  
The Other ◽  
Short Paper ◽  
Internal Diameter ◽  
Bunsen Burner ◽  
Metal Plates ◽  
Burning Charcoal ◽  
Initial Difference ◽  
To Receive

§ 1. In § 10 of our paper “On Electrical Properties of Fumes proceeding from Flames and Burning Charcoal,” communicated to this Society on 5th April, results of observations on the leakage between two parallel metal plates with an initial difference of electric potential of 6·2 volts between them, when the fumes from flames and burnings were allowed to pass between them and round them, were given. The first part (§§ 1–4) of the present short paper gives results of observations on the leakage between two copper plates 1 centimetre apart, when one of them is kept at a constant high positive or negative potential; and the other, after being metallically connected with the electrometer-sheath, is disconnected, and left to receive electricity through fumes between the two.The method of observation (see fig. 1) was as follows:—Two copper plates were fixed in a block of paraffin at the top of a round tinned iron funnel 96 centimetres long and 15·6 centimetres internal diameter. A spirit-lamp or a Bunsen burner, the only two flames used in these experiments, was placed at the bottom of the funnel, 86 centimetres below the two copper plates. One terminal of a voltaic battery was connected to one plate, B, and the other terminal was connected to the sheath of a Kelvin quadrant electrometer. The other copper plate was connected to one of the pair of quadrants of the electrometer in such a way that by pulling a silk cord with a hinged platinum wire at its end, this copper plate and this pair of quadrants could be insulated from the sheath of the electrometer and the rest of the apparatus.

Effect of anomalous pathway location on rate of canine experimental A-V reentrant tachycardia

1977 ◽  
Vol 233 (1) ◽  
pp. H44-H49
Author(s):  
S. Teague ◽  
P. Denes ◽  
F. Amat-y-Leon ◽  
K. M. Rosen
Keyword(s):  
Cycle Length ◽  
Electronic Circuit ◽  
The Other ◽  
Conduction Time ◽  
Reentrant Tachycardia ◽  
Intraventricular Conduction ◽  
Atrial Refractoriness ◽  
The Relationship ◽  
Atrial Stimulation ◽  
Anterior Posterior

The effect of anomalous pathway (AP) location and conduction time on the cycle length (CL) and sustainability of paroxysmal A-V reentrant tachycardia was studied in 15 dogs, using an anomalous pathway simulator (APS). The APS was a programmable digital electronic circuit with ability for unidirectional conduction, ventricular sensing, adjustable delay, and atrial stimulation. Contiguous pairs of ventricular sensing electrodes were placed along the A-V ring in each dog at the following sites: anterior, posterior, and lateral right (AR, PR, and LR) and anterior, posterior, and lateral left (AL, PL, and LL) and septal (S). There were significant differences in the CL of tachycardias among the tested sites (P less than 0.01). The CL of tachycardias from the LL site was significantly longer and from the PR site significantly shorter than that from the other sites (P less than 0.05). These differences in CL of tachycardias in relation to the AP location were explicable in terms of corresponding variation in conduction times of the various components of the tachycardia circuit (e.g., intra-atrial, A-V nodal, intraventricular conduction times). The differences in magnitude of the CL of tachycardias, although significant, were small. It was also found that all sites allowed maintenance of tachycardias up to an AP conduction time of 10 ms. In 27% of experiments, atrial refractoriness prevented sustained tachycardias at pathway delays of 1 ms. The relationship between AP conduction time and CL of tachycardias was exponential.

scholarly journals Integration and Evaluation of QUIC and TCP-BBR in longhaul Science Data Transfers

2019 ◽  
Vol 214 ◽  
pp. 08026 ◽  
Author(s):  
Raul H. C. Lopes ◽  
Virginia N. L. Franqueira ◽  
Duncan Rand
Keyword(s):  
Data Science ◽  
Perfect Match ◽  
The Other ◽  
Fine Tuning ◽  
The Internet ◽  
Science Data ◽  
Internet Protocols ◽  
Real Possibility ◽  
Data Transfers ◽  
And Performance

Two recent and promising additions to the internet protocols are TCP-BBR and QUIC. BBR defines a congestion policy that promises a better control in TCP bottlenecks on long haul transfers and can also be used in the QUIC protocol. TCP-BBR is implemented in the Linux kernels above 4.9. It has been shown, however, to demand careful fine tuning in the interaction, for example, with the Linux Fair Queue. QUIC, on the other hand, replaces HTTP and TLS with a protocol on the top of UDP and thin layer to serve HTTP. It has been reported to account today for 7% of Google’s traffic. It has not been used in server-to-server transfers even if its creators see that as a real possibility. Our work evaluates the applicability and tuning of TCP-BBR and QUIC for data science transfers. We describe the deployment and performance evaluation of TCP-BBR and comparison with CUBIC and H-TCP in transfers through the TEIN link to Singaren (Singapore). Also described is the deployment and initial evaluation of a QUIC server. We argue that QUIC might be a perfect match in security and connectivity to base services that are today performed by the Xroot redirectors.

Quasi-elliptic evanescent-mode filters using non-resonating mode waveguide cavities

2015 ◽  
Vol 7 (3-4) ◽  
pp. 211-218 ◽  
Author(s):  
Simone Bastioli ◽  
Richard V. Snyder
Keyword(s):  
Insertion Loss ◽  
Bandpass Filters ◽  
Experimental Results ◽  
The Other ◽  
Q Factor ◽  
Evanescent Mode ◽  
High Q ◽  
Transmission Zeros ◽  
Waveguide Cavities ◽  
A New Technique

A new technique to realize quasi-elliptic bandpass filters with extreme close-in rejection is presented in this paper. The basic idea consists of embedding non-resonating mode waveguide cavities within the structure of an evanescent-mode filter. Such a combination of cavities and resonators allows the generation of very close transmission zeros while realizing at the same time relatively wide passbands and stopbands. Both H-plane TE201 mode and E-plane TM110 mode configurations are used as non-resonating mode waveguide cavities. In contrast with the other elliptic evanescent-mode filters using conventional approaches, the insertion loss degradation at the filter cut-off frequencies is minimized thanks to the high-Q factor of the waveguide cavities, whose corresponding poles are located right at the edges of the passband. The experimental results of an evanescent-mode filter having 9.950–11.000 GHz passband and providing more than 45 dB rejection between 11.040 and 11.050 GHz validate the proposed solution.

scholarly journals On different load configurations for mixed-mode load-pull measurements, hybrid imperfections, and tuning ranges

2020 ◽  
Vol 12 (10) ◽  
pp. 996-1004 ◽  
Author(s):  
David Veit ◽  
Michael Gadringer ◽  
Erich Leitgeb
Keyword(s):  
Initial Treatment ◽  
Mixed Mode ◽  
Tuning Range ◽  
The Other ◽  
Pull System ◽  
Rule Of Thumb ◽  
Advantages And Disadvantages ◽  
Measurement Results ◽  
The Impact ◽  
Load Pull

AbstractEach of the various methods for mixed-mode load-pull measurements, which can be found in literature, has its own advantages and disadvantages. In this publication, we analyze two of the most commonly used setups and a third setup of which we provided an initial treatment in a previous publication. We investigated the impact of 180° hybrids on the tuning capabilities of a mixed-mode load-pull system. Furthermore, we provide a rule-of-thumb to easily estimate this impact using only some specifications of hybrids. For all analyzed setups, we use measurement results to show that the tuning range of the newly proposed setup is superior compared to the other setups, though hardware effort and tuning complexity are greater.

A microcomputer oximeter for whole blood

1983 ◽  
Vol 244 (5) ◽  
pp. H722-H725
Author(s):  
J. W. Kiel ◽  
A. P. Shepherd
Keyword(s):  
Whole Blood ◽  
Electronic Circuit ◽  
Linear Measurement ◽  
General Purpose ◽  
Electronic Components ◽  
Oxyhemoglobin Saturation ◽  
Analog To Digital ◽  
Short Program ◽  
Data Acquisition Program ◽  
Digital Channels

A system is described for measuring the percent of oxyhemoglobin in flowing whole blood. The system consists of an Apple II+ computer, a commercially available analog-to-digital converter, a simple electronic circuit to illuminate blood with light at two appropriate wavelengths, and a short program in BASIC. This oximeter is shown to yield a linear measurement of oxyhemoglobin saturation when compared with standard oxygen analyses. Data can be sampled at a sufficiently rapid rate to yield an essentially continuous measurement in typical cardiovascular studies. The system can be implemented by the average investigator from standard electronic components. The oximeter program can be combined into a general-purpose data acquisition program, and 15 analog-to-digital channels remain available for gathering other data.

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