"uuid","repository link","title","author","contributor","publication year","abstract","subject topic","language","publication type","publisher","isbn","issn","patent","patent status","bibliographic note","access restriction","embargo date","faculty","department","research group","programme","project","coordinates"
"uuid:0311d2fc-4ef8-4066-839a-5f844c57517c","http://resolver.tudelft.nl/uuid:0311d2fc-4ef8-4066-839a-5f844c57517c","Radio Receiver with Internal Compression of Input Signals Using a Dispersive Delay Line with Bandpass Filters","Pantyeyev, Roman (National Aviation University); Ianovskyi, F. (TU Delft Atmospheric Remote Sensing; National Aviation University); Mykolushko, Andriy (National Aviation University); Shutko, Volodymyr (National Aviation University)","","2023","This article proposes a receiving device in which arbitrary input signals are subject to pre-detector processing for the subsequent implementation of the idea of compressing broadband modulated pulses with a matched filter to increase the signal-to-noise ratio and improve resolution. For this purpose, a model of a dispersive delay line is developed based on series-connected high-frequency time delay lines with taps in the form of bandpass filters, and analysis of this model is performed as a part of the radio receiving device with chirp signal compression. The article presents the mathematical description of the processes of formation and compression of chirp signals based on their matched filtering using the developed model and proposes the block diagram of a radio receiving device using the principle of compression of received signals. The proposed model can be implemented in devices for receiving unknown signals, in particular in passive radar. It also can be used for studying signal compression processes based on linear frequency modulation in traditional radar systems.","Bandpass Filter; Chirp Signal; Compressive Receiver; Dispersive Delay Line; Signal Compression","en","journal article","","","","","","","","","","","Atmospheric Remote Sensing","","",""
"uuid:008c0fee-c62d-4515-837a-4e0ce0f5a1ea","http://resolver.tudelft.nl/uuid:008c0fee-c62d-4515-837a-4e0ce0f5a1ea","Automation of expert decisions in delayed line haul deliveries: an application of the Behavioural Artificial Intelligence Technology","Smeets, Joost (TU Delft Civil Engineering & Geosciences)","Tavasszy, Lorant (mentor); van Binsbergen, A.J. (mentor); Nadi Najafabadi, A. (mentor); Chorus, C.G. (mentor); Delft University of Technology (degree granting institution)","2022","Making decisions regarding delayed line haul transport is a very demanding and complex process in E-commerce distribution centres. Automating this process can decrease decision-maker discussion and assessment time and, as a result, allow decision-makers to spend more time on other demanding tasks like sorting and distributing. Automation in this domain increases on-time deliveries and strengthens the E-commerce firms’ competitive position. However, such decisions involve experts’ knowledge, discussions among planners, and complex thought processes. Therefore, it is necessary to involve planners’ inclinations and preferences to automate their decisions. This paper proposes the Behavioural Artificial Intelligence Technology (BAIT) to automate expert decisions in delayed line haul deliveries. BAIT uses fundamental Discrete Choice theory under the hood to capture expert preferences effectively, and incorporates these into a decision-making tool. We use this method in a case study to replicate expert decisions in delayed line haul deliveries at DHL Express. The case study results show that BAIT can accurately replicate expert decisions.","Behavioural AI Technology; Delayed line haul decisions; Discrete Choice Analysis; Decision automation","en","master thesis","","","","","","","","","","","","Transport, Infrastructure and Logistics","",""
"uuid:0ca4fb20-6561-4372-8410-5752772320d2","http://resolver.tudelft.nl/uuid:0ca4fb20-6561-4372-8410-5752772320d2","Thin-Film Lithium Niobate Acoustic Delay Line Oscillators","Li, Ming Huang (University of Illinois at Urbana-Champaign; National Tsing Hua University); Lu, Ruochen (University of Illinois at Urbana-Champaign); Manzaneque Garcia, T. (TU Delft Dynamics of Micro and Nano Systems); Gong, Songbin (University of Illinois at Urbana-Champaign)","Cheung, Karen (editor); Horsley, David (editor)","2020","In this work, thin-film lithium niobate (LiNbO3) acoustic delay line (ADL) based oscillators are experimentally investigated for the first time for the application of single-mode oscillators and frequency comb generation. The design space for the ADL-based oscillator is first analyzed, illustrating that the key to low phase noise lies in high center frequency (fo), large delay (τ G), and low insertion loss (IL) of the delay. Therefore, two self-sustained oscillators employing low noise amplifiers (LNA) and a low IL, long delay (fo=157MHz, IL =2.9dB, τG= 200-440ns) SH0 mode ADLs are designed for a case study. The two SH0 ADL oscillators show measured phase noise of -109 dBc/Hz and -127 dBc/Hz at 10-kHz offset while consuming 16 mA and 48 mA supply currents, respectively. Although the carrier power of the proposed oscillator is lower than published state-of-the-art ADL oscillators, competitive phase noise performance is still attained thanks to the low IL. Finally, frequency comb generation is also demonstrated with the same delay line and a commercial RF feedback amplifier, showing a comb spacing of 3.4 MHz that matches the open-loop characterization.","acoustic delay lines; lithium niobate; MEMS; oscillator; phase noise; piezoelectric transducers","en","conference paper","IEEE","","","","","Accepted Author Manuscript","","","","","Dynamics of Micro and Nano Systems","","",""
"uuid:0f965ef7-5b06-41d3-85b3-abef8940f37b","http://resolver.tudelft.nl/uuid:0f965ef7-5b06-41d3-85b3-abef8940f37b","Low-loss and wideband acoustic delay lines","Manzaneque Garcia, T. (TU Delft Dynamics of Micro and Nano Systems); Lu, Ruochen (University of Illinois at Urbana-Champaign); Yang, Yansong (University of Illinois at Urbana-Champaign); Gong, Songbin (University of Illinois at Urbana-Champaign)","","2019","This paper demonstrates low-loss acoustic delay lines (ADLs) based on shear-horizontal waves in thin-film LiNbO 3 for the first time. Due to its high electromechanical coupling, the shear-horizontal mode is suited for producing devices with large bandwidths. Here, we show that shear-horizontal waves in LiNbO 3 thin films are also excellent for implementing low-loss ADLs based on unidirectional transducers. The high acoustic reflections and large transducer unidirectionality induced by the mechanical loading of the electrodes on a LiNbO 3 thin film provide a great tradeoff between delay line insertion loss and bandwidth. The directionality for two different types of unidirectional transducers has been characterized. Delay lines with variations in the key design parameters have been designed, fabricated, and measured. One of our fabricated devices has shown a group delay of 75 ns with an IL below 2 dB over a 3-dB bandwidth of 16 MHz centered at 160 MHz (fractional bandwidth = 10%). The measured insertion loss for other devices with longer delays and different numbers of transducer cells are analyzed, and the loss contributing factors and their possible mitigation are discussed.","Acoustic devices; delay lines; lithium niobate (LiNbO3); microelectromechanical systems; piezoelectric transducers; transversal filters","en","journal article","","","","","","Accepted Author Manuscript","","","","","Dynamics of Micro and Nano Systems","","",""
"uuid:bd907442-60d2-4f76-a463-048db5d69d6a","http://resolver.tudelft.nl/uuid:bd907442-60d2-4f76-a463-048db5d69d6a","Integrated Temperature Sensors based on Heat Diffusion","Van Vroonhoven, C.P.L.","Makinwa, K.A.A. (promotor)","2015","This thesis describes the theory, design and implementation of a new class of integrated temperature sensors, based on heat diffusion. In such sensors, temperature is sensed by measuring the time it takes for heat to diffuse through silicon. An on-chip thermal delay can be determined by geometry and the thermal diffusivity of silicon, and since the thermal diffusivity of crystalline silicon is strongly temperature-dependent, the thermal delay is also temperature dependent. The sensor structures that measure such delays are known as Electrothermal Filters (ETFs). The field of temperature sensing using ETFs is still relatively unexplored. This thesis expands upon recent proof-of-concept research by studying the performance of ETF-based temperature sensors in more detail. Its main goal is to analyze whether or not ETFs can be used as competitive temperature sensors in CMOS technology. The thermal delay in an ETF can be very well-defined, since the silicon used in IC fabrication is highly pure, and the lithographic inaccuracy with which planar structures can be made is constantly improving. ETFs thus scale along the trend of Moore’s law, and they can become smaller, faster and more accurate in more advanced CMOS technologies. The main application of ETF-based temperature sensors is the thermal management of microprocessors: modern microprocessors require tens of small, fast and accurate temperature sensors to prevent overheating and to dynamically allocate processing power. Chapter 1 outlines this and other applications in some detail, and shows why existing temperature sensors are not well-suited for these applications. Chapter 2 presents the theoretical background to ETFs, starting with a discussion on the thermal diffusivity of silicon and silicon dioxide, analyzing their nominal values and their (different) temperature dependencies. It then discusses what type of ETFs to use to measure these most accurately. Furthermore, it outlines a family of performance metrics that enable a more formal study of ETFs characteristics. These are divided in two main categories: accuracy (e.g. error due to lithography, doping sensitivity) and resolution (how to optimize signal-to-noise ratio (SNR), advantages of scaling and using thermally isolated technologies such as silicon-on-insulator (SOI) processes). Chapter 3 presents various systems that can be built around ETFs. Using either silicon ETFs, oxide ETFs or a combination of both, several systems can be built, each with different functionality. The two systems described in most detail are the single silicon-ETF temperature-to-digital converter, and the silicon and oxide ETF-based self-referenced temperature-to-digital converter. The former uses an accurate time reference (such as a crystal oscillator) to convert an ETF’s thermal delay to an absolute temperature measurement. The latter performs a ratiometric temperature measurement and does not require an external time reference. This chapter also defines all of the circuit building blocks required to implement these systems, and derives their specifications from ETF theory and first principles. It concludes by showing that phase-domain sigma-delta modulators (PD??Ms) are the most appropriate readout circuits for precision ETF readout. Chapter 4 discusses PD??Ms in more detail and presents their transistor-level implementation. PD??Ms are a class of time-to-digital converters that are well-suited to digitize the thermal delay contained in the small, noisy signal at the ETF’s output. High precision and resolution are achieved by oversampling, noise shaping and the use of dynamic error correction techniques. Several methods of linearizing ETF-based temperature-to-digital converters are also presented. The chapter ends with measurements on a standalone PD??M, in order to show that its measurement error is sufficiently low to be able to characterize ETFs. Chapter 5 presents the measurement results for the ETFs studied in this thesis. There are results on ETF inaccuracy and resolution as a function of geometry and process technology, as well as results on sensitivity to doping fluctuations, mechanical stress, thermal interference and self-heating. The measured differences in ETF performance in bulk CMOS and SOI CMOS technology are also presented and analyzed. The lowest measured untrimmed inaccuracy for a single-ETF sensor in 0.18?m CMOS technology was ±0.2ºC (3?) from -55ºC to 125ºC. A self-referenced sensor, based on measuring the ratio of the thermal delay in silicon over that in oxide, shows a measured inaccuracy of ±0.4ºC (3?) from -70ºC to 200ºC after a one-point trim. Chapter 6 lists the main findings of this thesis and uses the measurement results to draw some conclusions on the competitiveness of ETFs. It shows that ETFs, due to their scalability, are attractive for thermal management of SoCs in deep submicron CMOS technologies. This thesis ends with some recommendations for further research.","Thermal Diffusivity; Electrothermal Filters; Thermal Delay Line; Phase-domain sigma-delta; Frequency-domain sigma-delta; precision sensor readout; Time-to-digital converters; low-offset; temperature sensors","en","doctoral thesis","","","","","","","","","Electrical Engineering, Mathematics and Computer Science","Electronic Instrumentation","","","",""
"uuid:d34e597c-dc60-4ef6-ace7-edca22bbcac4","http://resolver.tudelft.nl/uuid:d34e597c-dc60-4ef6-ace7-edca22bbcac4","Design of Front-End Receiver Electronics for 3D Trans-Esophageal Echocardiography","Saha, A.","Pertijs, M.A.P. (mentor); Yu, Z. (mentor)","2013","The motivation behind this thesis is that cardio-vascular diseases claim the highest number of lives each year globally. In order to enhance the accuracy in diagnosis, construction of 3D images of the heart is required. From these images, precise information can be obtained regarding the 3D anatomy of the heart and its functioning. Trans-Esophageal Echocardiography (TEE) is a promising technique to achieve this kind of precision in diagnosis. The objective of my thesis is to perform optimization at the system and circuit level, in order to improve power-efficiency and area-efficiency of the front-end receiver electronics. This electronic circuitry is integrated at the tip of a miniature TEE probe, which will be inserted through the esophagus close to the heart of the patient for diagnosis (via a gastroscopic tube). The signal processing chain of the receiver electronics consists of a Low Noise Amplifier (LNA), a Micro-Beamformer that performs delay and sum operation, and a Time Gain Compensation (TGC) amplifier. A novel low-power high-dynamic-range micro-beamformer is designed in TSMC 0.18 µm CMOS technology. The dynamic range is enhanced substantially compared to a previous implementation. This has been achieved by employing an Offset Calibration Loop (OCL). The proposed design is power-efficient, such that the total power consumption is almost a factor of 5 lower compared to the state-of-the-art design. The increase in thermal noise level is marginal (6.5%) after incorporating the OCL.","Offset Calibration loop; Micro-Beamformer; switched-capacitor circuits; ultrasound; Auto-Zeroing loop; dynamic range; delay line; time-gain-compensation","en","master thesis","","","","","","","","2014-01-22","Electrical Engineering, Mathematics and Computer Science","Microelectronics & Computer Engineering","","Microelectronics","",""
"uuid:7330511f-c22e-4ad1-a0ce-44c1c2747c05","http://resolver.tudelft.nl/uuid:7330511f-c22e-4ad1-a0ce-44c1c2747c05","Excitation and readout of a thermally driven time-domain optical coherence tomography system","Geljon, M.","French, P.J. (mentor); Margallo-Balbás, E. (mentor)","2010","This system presented in this thesis report will be put into practice in a sensory system for dental drilling. The aim of this system is to provide real-time feedback to the practitioner about the anatomical structure in close vicinity of the drill bit. Therefore, the system has to deal with in vivo, in situ bone tissue, bone tissue within a living organism that cannot be removed from the human body for analysis. Hence, non-destructive biopsy is desired. Optical Coherence Tomography (OCT) imaging is able to provide optical biopsy at a high resolution and in real time. With the use of Optical Coherence Tomography (OCT), e.g. blood vessels, nerves and sinuses close to the drill can be detected before the drill bit does damage to these vulnerable anatomical structures. Silicon process technology offers a promising platform for a relatively cheap Time-Domain Optical Coherence Tomography (TD-OCT) system. A first step into the direction of a single-chip TD-OCT system is the development of a thermally excited Optical Delay Line (ODL) or Thermo-Optical Delay Line (TODL). This thesis project is dedicated to the characterisation of the TODL in order to find the voltage excitation waveform that results in a linear variation in effective optical path length. By making use of the models, non-linearites can be compensated and the limited bandwidth can be extended by pre-emphasis of the voltage excitation waveform. Two models are presented, based on the general heat equation for conduction. One model utilizes Fourier analysis to solve the heat equation and is a linear model by definition. The second model uses numerical methods and is able to incorporate non-linearities, such as relations for thermal conductivity, diffusivity and the variation of the refractive index of silicon as a function of temperature. Measurements are conducted to verify the modeling. The linear model has been shown to perform poorly. The non-linear model was able to compensate for the non-linearities mentioned. However, first results showed that the TODL was behaving slightly slower than expected. The non-linear model was corrected for this behaviour by scalling down the relation for thermal diffusivity. The corrected non-linear model achieved a linear variation of the effective optical path lenght over a scanning range of 200 ?m at a line scanning rate of 10 kHz.","optical delay line; optical coherence tomography; non-linear modelling","en","master thesis","","","","","","","","2010-07-01","Electrical Engineering, Mathematics and Computer Science","Microelectronics & Computer Engineering","","","",""