Oscillation-based DFT for Second-order Bandpass OTA-C Filters

This document is the Accepted Manuscript version. Under embargo until 6 September 2018. The final publication is available at Springer via https://doi.org/10.1007/s00034-017-0648-9.This paper describes a design for testability technique for second-order bandpass operational transconductance amplifier and capacitor filters using an oscillation-based test topology. The oscillation-based test structure is a vectorless output test strategy easily extendable to built-in self-test. The proposed methodology converts filter under test into a quadrature oscillator using very simple techniques and measures the output frequency. Using feedback loops with nonlinear block, the filter-to-oscillator conversion techniques easily convert the bandpass OTA-C filter into an oscillator. With a minimum number of extra components, the proposed scheme requires a negligible area overhead. The validity of the proposed method has been verified using comparison between faulty and fault-free simulation results of Tow-Thomas and KHN OTA-C filters. Simulation results in 0.25μm CMOS technology show that the proposed oscillation-based test strategy for OTA-C filters is suitable for catastrophic and parametric faults testing and also effective in detecting single and multiple faults with high fault coverage.Peer reviewedFinal Accepted Versio

A performance evaluation of oscillation based test in continuous time filters

This work evaluates the ability of OBT for detecting parametric faults in continuous-time filters. To this end, we adopt two filters with quite different topologies as cases of study and a previously reported statistical fault model. In addition, we explore the behavior of the test schemes when a particular test condition is changed. The new data reported here, obtained from a fault simulation process, reveal a lower performance of OBT not observed in previous work using single-deviation faults, even under the change in the test condition.publishedVersionFil: Romero, Eduardo Abel. Universidad Tecnológica Nacional. Facultad Regional Villa María; Argentina.Fil: Romero, Eduardo Abel. Universidad Nacional de Córdoba. Facultad de Matemática, Astronomía y Física; Argentina.Fil: Costamagna, Marcelo. Universidad Tecnológica Nacional. Facultad Regional Villa María; Argentina.Fil: Peretti, Gabriela Marta. Universidad Tecnológica Nacional. Facultad Regional Villa María; Argentina.Fil: Peretti, Gabriela Marta. Universidad Nacional de Córdoba. Facultad de Matemática, Astronomía y Física; Argentina.Fil: Marqués, Carlos Alberto. Universidad Nacional de Córdoba. Facultad de Matemática, Astronomía y Física; Argentina.Otras Ingeniería Eléctrica, Ingeniería Electrónica e Ingeniería de la Informació

An alternative evaluation of oscillation-based test. A case study

In this work, we evaluate the ability of Oscillation-Based Test (OBT) for detecting in continuous-time filters, more realistic parametric faults. As a case study, we consider a low pass fourth order leapfrog filter. We use a fault simulation based on Monte Carlo and redefine a fault coverage metric to globally characterized OBT. The fault model applied assumes that only one component can be faulty while the others adopt random values within their tolerance bands. Statistical deviations in the values of the fault-free components are considered in order to obtain a more accurate evaluation of the test technique under study. The fault coverage data obtained show high values only for high deviation faults and presents significant differences for positive and negative deviations. In addition, the metric also reveals that some of the components of the filter under study can be considered as hard to test.Sociedad Argentina de Informática e Investigación Operativ

Influence of PVT variation and threshold selection on OBT and OBIST fault detection in RFCMOS amplifiers

Please read abstract in the article.The NRF/F.RS.-FNRS South Africa–Wallonia Joint Science and Technology Research Collaboration.https://ieeexplore.ieee.org/xpl/RecentIssue.jsp?punumber=8784029hj2024Electrical, Electronic and Computer EngineeringSDG-09: Industry, innovation and infrastructur

Analogue filter networks: developments in theory, design and analyses

Not availabl

System-level design and RF front-end implementation for a 3-10ghz multiband-ofdm ultrawideband receiver and built-in testing techniques for analog and rf integrated circuits

This work consists of two main parts: a) Design of a 3-10GHz UltraWideBand (UWB) Receiver and b) Built-In Testing Techniques (BIT) for Analog and RF circuits. The MultiBand OFDM (MB-OFDM) proposal for UWB communications has received significant attention for the implementation of very high data rate (up to 480Mb/s) wireless devices. A wideband LNA with a tunable notch filter, a downconversion quadrature mixer, and the overall radio system-level design are proposed for an 11-band 3.4-10.3GHz direct conversion receiver for MB-OFDM UWB implemented in a 0.25mm BiCMOS process. The packaged IC includes an RF front-end with interference rejection at 5.25GHz, a frequency synthesizer generating 11 carrier tones in quadrature with fast hopping, and a linear phase baseband section with 42dB of gain programmability. The receiver IC mounted on a FR-4 substrate provides a maximum gain of 67-78dB and NF of 5-10dB across all bands while consuming 114mA from a 2.5V supply. Two BIT techniques for analog and RF circuits are developed. The goal is to reduce the test cost by reducing the use of analog instrumentation. An integrated frequency response characterization system with a digital interface is proposed to test the magnitude and phase responses at different nodes of an analog circuit. A complete prototype in CMOS 0.35mm technology employs only 0.3mm2 of area. Its operation is demonstrated by performing frequency response measurements in a range of 1 to 130MHz on 2 analog filters integrated on the same chip. A very compact CMOS RF RMS Detector and a methodology for its use in the built-in measurement of the gain and 1dB compression point of RF circuits are proposed to address the problem of on-chip testing at RF frequencies. The proposed device generates a DC voltage proportional to the RMS voltage amplitude of an RF signal. A design in CMOS 0.35mm technology presents and input capacitance <15fF and occupies and area of 0.03mm2. The application of these two techniques in combination with a loop-back test architecture significantly enhances the testability of a wireless transceiver system

Modeling and Analysis of Power Processing Systems (MAPPS), initial phase 2

The overall objective of the program is to provide the engineering tools to reduce the analysis, design, and development effort, and thus the cost, in achieving the required performances for switching regulators and dc-dc converter systems. The program was both tutorial and application oriented. Various analytical methods were described in detail and supplemented with examples, and those with standardization appeals were reduced into computer-based subprograms. Major program efforts included those concerning small and large signal control-dependent performance analysis and simulation, control circuit design, power circuit design and optimization, system configuration study, and system performance simulation. Techniques including discrete time domain, conventional frequency domain, Lagrange multiplier, nonlinear programming, and control design synthesis were employed in these efforts. To enhance interactive conversation between the modeling and analysis subprograms and the user, a working prototype of the Data Management Program was also developed to facilitate expansion as future subprogram capabilities increase

Ultra Low Power IEEE 802.15.4/ZIGBEE Compliant Transceiver

Low power wireless communications is the most demanding request among all wireless users. A battery life that can survive for years without being replaced, makes it realistic to implement many applications where the battery is unreachable (e.g. concrete walls) or expensive to change (e.g underground applications). IEEE 802.15.4/ZIGBEE standard is published to cover low power low cost applications, where the battery life can last for years, because of the 1% duty cycle of operation. A fully integrated 2.4GHz IEEE802.15.4 Compliant transceiver suitable for low power, low cost ZIGBEE applications is implemented. Direct conversion architecture is used in both Receiver and Transmitter, to achieve the minimum possible power and area. The chip is fabricated in a standard 0.18um CMOS technology. In the transmit mode, the transmitter chain (Modulator to PA) consumes 25mW, while in the receive mode, the iv receiver chain (LNA to Demodulator) consumes 5mW. The Integer-N Frequency Synthesizer consumes 8.5mW. Other Low power circuits are reported; A 13.56 Passive RFID tag and a low power ADC suitable for Built-In-Testing applications

Aptamer biosensors

Aptamers are single stranded nucleic acids, typically composed of between twenty to eighty nucleotides in length, capable of binding selectively to non-nucleic acid ligands. Aptamers are selected through a combinatorial chemistry process called Systematic Evolution of Ligands by Exponential enrichment (SELEX), which is composed of successive cycles of selection based on target affinity, followed by amplification. This results in the Darwinian evolution of the nucleic acid library resulting in increasing library homogeneity and target affinity over time. Aptamers have been extensively investigated for potential application as sensing molecules, with roles similar to those traditionally occupied by antibodies. Aptamers and monoclonal antibodies have similar sensitivity in the pico to micro molar range. However aptamers have a number of advantages over protein antibodies, such as greater thermal stability, ease of chemical amplification, and amenability to modification, especially at the 5’ and 3’ prime ends. The work performed in this Thesis is divided into three categories. The first section describes the development of voltammetric Kanamycin and Tetracycline biosensors based on electrode immobilized, redox label bioconjugated nucleotide molecular beacons. These sensors relies on the target-aptamer binding induced spatial displacement of the redox label towards or away from the electrode surface as a means of signal generation. Further study was conducted to test the feasibility of this sensor design under likely field operation environments such as in soil sample analysis for microbial product discovery and in agricultural effluence for regulatory purposes. The biosensor was also enhanced by gel encapsulation for defense against nuclease degradation. Negative control was performed against structurally similar antibiotics of the same family in order to prove the specificity of the biosensor. Lastly, the sensor was moved onto an automated platform in a multichannel format in order to improve the utility of the sensor. The second section describes the development of a voltammetric biosensor based on Enzyme-Linked Oligonucleotide Assay (ELONA) technology. Two sub-types of ELONA-like biosensors were originally envisioned, based respectively on direct and indirect ELONA. Both sub-types depend on the mass of redox label rich Gold Nanoparticles (GNP) at the electrode surface as a means of signal generation. Negative controls was performed against globular proteins Bovine Serum Albumin and Lysozyme, the former since it is the most ubiquitous protein component of serum (the most likely biosensor operational environment), the latter as a worst case scenario for non-specific false positive results due to its positive charge. The last section describes an attempt to develop an automated SELEX device based on mesofluidic flow channels. It was hoped that by using flow channels of a millimeter scale it would be possible to retain both the advantages of the conventional auto sampler based SELEX protocols (large library and sequence variation), while also gaining the primary advantages of microfluidic SELEX (reduced contamination risk, low initial cost and maintenance). Essential components of the SELEX device, such as thermal cycler, liquid handling, electronics infrastructure, and software control were designed, tested and integrated. Lastly an attempt was made to perform automated SELEX against Lysozyme targets using the device, though no nucleic acid with high affinity to target had yet been successfully isolated by the end of this study.Open Acces