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The aim of this work is the study of the performance of planar inductors due to the presence of shielding structures. Equivalent inductance, quality factor and self resonance of the component are chosen as figures of merit for a fair comparison. Two experiments are proposed. In the first one, identical inductor geometries are evaluated under three different electromagnetic boundary conditions:(i)...
In this paper, a new structure based on linear-assisted DC-DC buck converter principle is proposed. Using a segmented LDO regulator instead of the conventional linear one in the hybrid scheme, reduces the difference between input and output voltages and also the switching frequency of the buck converter, while the circuit provides a lower output ripple, better transient response. In addition, the...
This work is aimed to demonstrate the potential of Inkjet printing combined with electroless growth to implement high performance RF inductors on standard low temperature co-fired ceramic substrates. Enhanced customization and tuning are the main advantage of this technological combination in front of standard low temperature co-fired ceramic technology. Two sets of samples have been fabricated and...
This paper presents an experimental set-up that combines on-chip digital techniques with off-chip Arduino-based hardware to simplify the test of widely-programmable analog-to-digital converters. The presented methodology is specially intended for analog and mixed-signal circuits which require a large number of digital signals to reconfigure their performance to different electrical specifications,...
A constructive interference (CI) based flooding mechanism, using hardware-generated acknowledgments (ACKs), is proposed to achieve highly reliable source-to-sink communication of very short critical packets within a wireless sensor network (WSN) working in harsh environments. CI is only achieved if the senders synchronize their packet transmissions with sub-microsecond precision. In order to achieve...
This paper presents the modeling of linear-assisted DC-DC regulators. This kind of voltage regulators consists of a switching converter together with a classic or LDO (low dropout) linear voltage regulator. While the linear regulator provides the constant output voltage, the switching converter conducts nearly all the current provided in the output load, and keeping the regulator current close to...
Some applications, as those related to space, require an extremely high level of safeness in the electronic hardware. In these cases, redundancy is almost the only way to be really safe; however, the control of redundant elements is not a simple task at all. In this article, we present SafeSoC, a safe electronic card designed for critical applications. Its central processor is an FPGA that manages...
One of the consequence of the scaling down of latest technologies, is that digital circuits are more prone to be affected by faults caused by physical manufacturing defects, environmental perturbations (e.g., radiations, electromagnetic interference), or aging-related phenomena. Understanding the behavior of the whole system in the presence of faults affecting digital circuits is crucial for designing...
This paper describes the design of a Sensor Signal Conditioner for a pressure sensor transducer in automotive applications. The circuit has been implemented in a 0.35 um CMOS process and comprises an Instrumentation Amplifier (IA), a 2nd order Chebyshev active low pass filter and an 1st order incremental ADC. The IA consumes 3mA with a supply voltage of 5V. Measured gain is 30 dB with 10° of phase...
Obstructive sleep apnea is a common type of sleep-disordered breathing, often treated with an oral appliance that protrudes the mandible. This therapy widens the upper airway thereby eliminating and/or preventing collapses and/or obstructions of the upper airway during sleep. Up till now, monitoring of the actual position of the mandible during therapy was not available — although this should be considered...
In this paper we describe different procedures to compensate the fixed pattern noise (FPN). These procedures have been developed and tested for a camera designed by us, which is based on a CMOS active pixel sensor (APS). In this kind of sensors, the FPN mainly depends on the noise coming from the column selection electronics. In this sense, we suggest and assess three different methods for FPN compensation:...
This work resumes a new solution for cellular Wireless Sensor Network. It is based on the use of both asynchronous and synchronous IEEE 802.15.4g networks. The solution minimize power consumption from one to N synchronous channels. This solution is finally oriented to integrate the devices into the Internet of things (IoT).
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