scholarly journals Photo detector IC for Blu-ray-Disc applications: a realization applying efficient design methodologies

2011 ◽  
Vol 9 ◽  
pp. 219-223
Author(s):  
S. Lange ◽  
T. Reich ◽  
J. Nowak ◽  
B. Dimov ◽  
M. Meister ◽  
...  
Keyword(s):  
High Speed ◽  
Low Noise ◽  
Noise Power ◽  
The Novel ◽  
Efficient Design ◽  
Design Methodologies ◽  
Low Power Dissipation ◽  
Speed Performance ◽  
Performance Results ◽  
Novel Design

Abstract. A high-speed photo detector IC for application in Blu-ray/DVD/CD drives is presented. Bandwidths for the highest gain of 254 MHz and 221 MHz for 405 nm (Blu-ray) and 635 nm (DVD) wavelengths, respectively, were achieved by applying novel design methodologies. The combination of this outstanding speed performance with its low power dissipation of 192 mW at 5V supply and the low noise power of −72 dBm at 300 MHz makes it the best in literature reported optical transceiver IC for Blu-ray and Blu-ray/DVD/CD multi drives. Beside the excellent performance results, the usage of the novel design methodologies gave us an increased design efficiency with 25% compared to earlier similar design processes.

Experimental Investigation on a 3 kW Air Tesla Expander With High Speed Generator

2020 ◽  
Author(s):  
Avinash Renuke ◽  
Federico Reggio ◽  
Paolo Silvestri ◽  
Alberto Traverso ◽  
Matteo Pascenti
Keyword(s):  
High Speed ◽  
Experimental Tests ◽  
Working Fluid ◽  
Small Scale ◽  
Efficient Design ◽  
Electric Generator ◽  
Vibrational Response ◽  
Machine Maintenance ◽  
Performance Results

Abstract Tesla bladeless turbomachines are recently being investigated due to many advantages such as its simple design and ease of manufacturing. If an efficient design is achieved, this will be a promising machine in the area of small-scale power generation and energy harvesting. This paper focuses on the experimental performance investigation of 3 kW (rated power) Tesla bladeless expander. The Tesla expander and electric generator are housed in a single casing making it first of its kind being tested with such configuration. The expander is fed with air and operated at high rotational speeds up to 40000 rpm. The test is carried out with different number of nozzles to understand its effect on the performance. Results show that the peak efficiency for two nozzles is better than one nozzle and four nozzle configurations for the same inlet pressure conditions. Experimental tests revealed that this turbine is most efficient Tesla turbine till now with air as a working fluid. Furthermore, one of the most important losses in Tesla turbomachines, nozzle loss, is experimentally characterized. Specific vibrational tests were carried out to obtain complete machine dynamical characterization. The vibrational response characterization of the turbine enabled us to recognize a disk mode family solicited by the air flow and to perform a proper machine maintenance and balancing aiming to reduce the energy of its operational vibration.

A Study on 400V Sized Trench Power Semiconductor for Smart Power ICs

2013 ◽  
Vol 712-715 ◽  
pp. 1771-1774
Author(s):  
Ey Goo Kang
Keyword(s):  
High Speed ◽  
High Efficiency ◽  
High Reliability ◽  
Low Noise ◽  
Noise Power ◽  
Smart Power ◽  
Large Power ◽  
Power Mosfet ◽  
Power Semiconductor ◽  
Fast Switching

Power MOSFET is develop in power savings, high efficiency, small size, high reliability, fast switching, low noise. Power MOSFET can be used high-speed switching transistors devices. Recently attention to the motor and the application of various technologies. Power MOSFET is devices the voltage-driven approach switching devices are design to handle on large power, power supplies, converters, motor controllers. In this paper, design the 400 V Planar type, and design the trench type for realization of low on-resistance. Trench Power MOSFET Vth : 3.25 V BV : 484 V Ron : 0.0395 Ohm has been optimized.

scholarly journals Low-Noise Design of Medium-Range Aircraft for Energy Efficient Aviation

Aerospace ◽  
2021 ◽  
Vol 9 (1) ◽  
pp. 3
Author(s):  
Vincent Domogalla ◽  
Lothar Bertsch ◽  
Martin Plohr ◽  
Eike Stumpf ◽  
Zoltán S. Spakovszky
Keyword(s):  
Energy Efficient ◽  
Pressure Ratio ◽  
Low Noise ◽  
Exposure Level ◽  
The Novel ◽  
Sound Exposure ◽  
Fuel Burn ◽  
Noise Shielding ◽  
Speed Performance ◽  
Low Noise Design

Promising low-noise aircraft architectures have been identified over the last few years at DLR. A set of DLR aircraft concepts was selected for further assessment in the context of sustainable and energy-efficient aviation and was established at the TU Braunschweig in 2019, the Cluster of Excellence for Sustainable and Energy-Efficient Aviation (SE2A). Specific Top-Level aircraft requirements were defined by the cluster and the selected DLR aircraft designs were improved with focus on aircraft noise, emissions, and contrail generation. The presented paper specifically addresses the reduction of aviation noise with focus on noise shielding and modifications to the flight performance. This article presents the state of the art of the simulation process at DLR and demonstrates that the novel aircraft concepts can reduce the noise impact by up to 50% in terms of sound exposure level isocontour area while reducing the fuel burn by 6%, respective to a conventional aircraft for the same mission. The study shows that a tube-wing architecture with a top-mounted, forward-swept wing and low fan pressure ratio propulsors installed above the fuselage at the wing junction can yield significant noise shielding at improved low-speed performance and reduce critical fuel burn and emissions.

scholarly journals A reusable agent design pattern with flexibility and extensibility

2011 ◽  
Vol 8 (4) ◽  
pp. 1229-1250 ◽  
Author(s):  
Haolan Zhang ◽  
Wenhua Zeng ◽  
der van
Keyword(s):  
Design Pattern ◽  
Physical World ◽  
Experimental Program ◽  
The Novel ◽  
Efficient Design ◽  
Agent Based ◽  
Domain Specific ◽  
Practical Algorithms ◽  
Agent Design ◽  
Novel Design

Intelligent agent-based systems are regarded as the promising technology in bridging the gap between the physical world and cyber-applications. In spite of the rising demands for reusable information systems; current designs are still insufficient in providing efficient reusable mechanisms for system design. One of the major problems hinders the development of information reuse in most traditional systems is the lack of the autonomous character among system modules or subsystems. The emergence of agent technology is able to solve the problem plaguing many traditional systems. Existing agent design models create an agent as a sole system with built-in domain-specific capabilities. However, this design pattern causes several problems while matching and updating agents? capabilities due to the built-in design pattern in these models decreases agents? extensibility, flexibility and reusability. In this paper we introduce a novel design for agent-based systems, which is able to provide an efficient design pattern for improving the reusability, extensibility and flexibility of agent design. The novel agent capability design offers an open and flexible structure; and implements several practical algorithms that can improve the system performance. An experimental program based on several practical cases has been developed to evaluate the performance of the proposed design. The empirical results reveal the efficiency of the new agent design pattern.

scholarly journals Towards high-power, high-coherence, integrated photonic mmWave platform with microcavity solitons

2021 ◽  
Vol 10 (1) ◽  
Author(s):  
Beichen Wang ◽  
Jesse S. Morgan ◽  
Keye Sun ◽  
Mandana Jahanbozorgi ◽  
Zijiao Yang ◽  
...  
Keyword(s):  
High Power ◽  
High Speed ◽  
Low Noise ◽  
Heterodyne Detection ◽  
Large Signal ◽  
Low Loss ◽  
Millimetre Wave ◽  
Running System ◽  
Low Power Dissipation ◽  
Free Running

AbstractMillimetre-wave (mmWave) technology continues to draw great interest due to its broad applications in wireless communications, radar, and spectroscopy. Compared to pure electronic solutions, photonic-based mmWave generation provides wide bandwidth, low power dissipation, and remoting through low-loss fibres. However, at high frequencies, two major challenges exist for the photonic system: the power roll-off of the photodiode, and the large signal linewidth derived directly from the lasers. Here, we demonstrate a new photonic mmWave platform combining integrated microresonator solitons and high-speed photodiodes to address the challenges in both power and coherence. The solitons, being inherently mode-locked, are measured to provide 5.8 dB additional gain through constructive interference among mmWave beatnotes, and the absolute mmWave power approaches the theoretical limit of conventional heterodyne detection at 100 GHz. In our free-running system, the soliton is capable of reducing the mmWave linewidth by two orders of magnitude from that of the pump laser. Our work leverages microresonator solitons and high-speed modified uni-traveling carrier photodiodes to provide a viable path to chip-scale, high-power, low-noise, high-frequency sources for mmWave applications.

A Hybrid Tracked-Wheeled Multi-Directional Mobile Robot

2019 ◽  
Vol 11 (4) ◽  
Author(s):  
Pinhas Ben-Tzvi ◽  
Wael Saab
Keyword(s):  
Mobile Robot ◽  
High Speed ◽  
Longitudinal Direction ◽  
Vertical Axis ◽  
The Novel ◽  
Lateral Direction ◽  
Hybrid Combination ◽  
Inclined Surfaces ◽  
Translational Joint ◽  
Novel Design

This paper presents the novel design and integration of a mobile robot with multi-directional mobility capabilities enabled via a hybrid combination of tracks and wheels. Tracked and wheeled locomotion modes are independent from one another, and are cascaded along two orthogonal axes to provide multi-directional mobility. An actuated mechanism toggles between these two modes for optimal mobility under different surface-traction conditions, and further adds an additional translational axis of mobility. That is, the robot can move in the longitudinal direction via the tracks on rugged terrain for high traction, in the lateral direction via the wheels on smooth terrain for high-speed locomotion, and along the vertical axis via the translational joint. Additionally, the robot is capable of yaw axis mobility using differential drives in both tracked and wheeled modes of operation. The paper presents design and analysis of the proposed robot along with a dynamic stabilization algorithm to prevent the robot from tipping over while carrying an external payload on inclined surfaces. Experimental results using an integrated prototype demonstrate multi-directional capabilities of the mobile platform and the dynamic stability algorithm to stabilize the robot while carrying various external payloads on inclined surfaces measuring up to 2.5 kg and 10 deg, respectively.

Isolating Effects of Area Ratio From Lobe Number for Turbofan Engine Exhaust Systems

2014 ◽  
Author(s):  
Alex Wright ◽  
Ali Mahallati ◽  
Julio Militzer
Keyword(s):  
High Speed ◽  
Engine Performance ◽  
Area Ratio ◽  
Fluid Viscosity ◽  
Engine Exhaust ◽  
Engine Operation ◽  
Low Speed ◽  
High Speed Engine ◽  
Speed Performance ◽  
Performance Results

This paper presents a numerical investigation of lobed mixer performance at experimentally validated low speed conditions and conditions representative of high speed engine operation. The purpose of this study was to first assess and understand how variations in bypass-to-core area ratio (AR) can affect engine performance, then isolate those effects to determine the efficacy of increasing the number of mixer lobes. The area ratio was manipulated via adjustment of the lobe crest and valley radiuses. No other geometric features were altered in any of the 5 mixers studied (12-lobe AR of 3, 2.5 and 3.5, 16-lobe AR of 3 and 18-lobe AR of 3). Results indicate that performance can be affected by area ratio. Low-speed results showed that pressure loss and thrust output were improved at lower area ratios. High speed results showed the opposite. This behavior is believed to be the result of a bypass-to-core momentum ratio difference between the two test conditions. These effects were avoided when studying the number of lobes by maintaining a constant area ratio. Results indicate that adding lobes enhanced exhaust mixing but hampered performance at low speed conditions. No appreciable performance difference was observed at high speed conditions. Fluid viscosity and associated viscous mixing losses are believed to be the parameters at fault for the reduced low-speed performance results.

scholarly journals Analysis and Design of a CMOS Ultra-High-Speed Burst Mode Imager with In-Situ Storage Topology Featuring In-Pixel CDS Amplification

Sensors ◽  
2018 ◽  
Vol 18 (11) ◽  
pp. 3683
Author(s):  
Linkun Wu ◽  
David San Segundo Bello ◽  
Philippe Coppejans ◽  
Jan Craninckx ◽  
Andreas Süss ◽  
...  
Keyword(s):  
High Speed ◽  
Low Noise ◽  
System Level ◽  
Noise Power ◽  
Memory Bank ◽  
Trade Off ◽  
Burst Mode ◽  
Analysis And Design ◽  
Ultra High Speed

This paper presents an in-situ storage topology for ultra-high-speed burst mode imagers, enabling low noise operation while keeping a high frame depth. The proposed pixel architecture contains a 4T pinned photodiode, a correlated double sampling (CDS) amplification stage, and an in-situ memory bank. Focusing on the sampling noise, the system level trade-off of the proposed pixel architecture is discussed, showing its advantages on the noise, power, and scaling capability. Integrated with an AC coupling CDS stage, the amplification is obtained by exploiting the strong capacitance to the voltage relation of a single NMOS transistor. A comprehensive noise model is developed for optimizing the trade-off between the area and noise. As a proof-of-concept, a prototype imager with a 30 µm pixel pitch was fabricated in a CMOS 130 nm technology. A 108-cell memory bank is implemented allowing dense layout and parallel readout. Two types of CDS amplification stages were investigated. Despite the limited memory capacitance of 10 fF/cell, the photon transfer curves of both pixel types were measured over different operation speeds up to 20 Mfps showing a noise performance of 8.4 e−.

Laser Silicon Interaction Study on Ring Oscillators to Establish Temperature Voltage Dependency Trends on 14 nm and Future FinFET Technologies

2017 ◽  
Author(s):  
Gaurav Mattey ◽  
Lava Ranganathan
Keyword(s):  
High Speed ◽  
Laser Frequency ◽  
Ring Oscillator ◽  
Switching Speed ◽  
Dual Nature ◽  
Voltage Imaging ◽  
Multiple Cores ◽  
Speed Performance ◽  
Self Test ◽  
Frequency Changes

Abstract Critical speed path analysis using Dynamic Laser Stimulation (DLS) technique has been an indispensable technology used in the Semiconductor IC industry for identifying process defects, design and layout issues that limit product speed performance. Primarily by injecting heat or injecting photocurrent in the active diffusion of the transistors, the laser either slows down or speeds up the switching speed of transistors, thereby affecting the overall speed performance of the chip and revealing the speed limiting/enhancing circuits. However, recently on Qualcomm Technologies’ 14nm FinFET technology SOC product, the 1340nm laser’s heating characteristic revealed a Vt (threshold voltage) improvement behavior at low operating voltages which helped identify process issues on multiple memory array blocks across multiple cores failing for MBIST (Memory Built-in Self-test). In this paper, we explore the innovative approach of using the laser to study Vt shifts in transistors due to process issues. We also study the laser silicon interactions through scanning the 1340nm thermal laser on silicon and observing frequency shifts in a high-speed Ring Oscillator (RO) on 16nm FinFET technology. This revealed the normal and reverse Temperature Dependency Gate voltages for 16nm FinFET, thereby illustrating the dual nature of stimulation (reducing mobility and improving Vt) from a thermal laser. Frequency mapping through Laser Voltage Imaging (LVI) was performed on the Ring Oscillator (RO) using the 1340nm thermal laser, while concurrently stimulating the transistors of the RO. Spatial distribution of stimulation was studied by observing the frequency changes on LVI.

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