Data Convertors Research Articles

An improved frequency compensation for three‐stageCMOSamplifier

AbstractMulti‐stage operational amplifiers are considered as basic building blocks in modern electronics since advanced Complementary metal–oxide–semiconductor (CMOS) technology limits exploiting cascode structures due to suffering from low voltage swings and the need of high gain capability. In this regard, an improved and high‐performance three‐stage CMOS amplifier is proposed in this work. The presented structure modeled mathematically and simulated via HSPICE circuit simulator with the 0.18‐μm CMOS technology. An straightforward symbolic calculation is explained to obtain linear transfer function. According to the simulation results, the proposed circuit show 149 dB as DC gain while express 7.3 MHz and 380 μW as gain‐bandwidth product and power dissipation, respectively. Such a high‐performance amplifier has great potential to realize more complex analog and mixed mode signal systems such as modulators and data convertors.

Semantic approach to compliance checking of underground utilities

Utility regulations stipulate the spatial configurations between underground utilities and their surroundings to avoid interferences and disruptions of utility services. Utility compliance checking aims to detect spatial non-compliances in underground utilities by examining geospatial data of utilities and their surroundings against textual data of utility regulations. However, the integration of heterogeneous utility geospatial and textual data for compliance checking remains a big challenge. This paper presents a semantic approach to integrate heterogeneous data and enable automated compliance checking of underground utilities through logic and spatial reasoning. The approach consists of the following key components: (1) four interlinked ontologies that provide the semantic schema for heterogeneous data relevant to utility compliance checking, (2) two data convertors for the conversion of heterogeneous data from proprietary formats into a common and interoperable format following the semantic schema, and (3) a query mechanism with spatial extensions for the detection of non-compliant utility instances. The approach was tested on a sample utility database, and the results demonstrate the success of the proposed approach in the integration of heterogeneous data from multiple sources and automated detection of spatial non-compliances in underground utilities. In addition to utility compliance checking, the approach can be extended to other application cases where both data integration from multiple sources and spatial reasoning are required.

Design of interfaces between high speed data converters and high performance FPGAs for software defined radio applications

Software defined radio (SDR) is a vast and emerging field that requires the design of various technologies such as antenna, RF, IF, and digital baseband subsystems. Among all these technologies, data converters that convert signals between analog and digital domains are highly crucial. On the other hand field programmable gate arrays (FPGAs) based platforms are being preferred for evaluating and implementing the digital communication concepts due to their programmability and reconfigurability. As a result they are well suited for the design of SDR technology. In this research work, we develop a platform where high-speed data converters are interfaced with high performance FPGAs. Interfaces are designed for analog-to-digital convertors (ADC) and digital-to-analog convertors (DAC) to communicate with FPGAs. For the interface design between ADC and FPGA, a double data rate and a low voltage differential signalling based serial output is adopted. And, for the interface design between DAC and other FPGA, parallel complementary metal oxide semiconductor outputs are used. To reconfigure the modes and parameters of the data convertors, serial peripheral interface data controllers have been designed. We have through simulations evaluated the performance of our designed interfaces between data convertors and FPGAs.

Dual-Band Bandpass Double Ground Plane Coaxial Resonators and Filters

This paper proposes a novel double ground plane coaxial resonator that allows to realize two independent coaxial cavity modes in reduced physical volume. This configuration of compact high performance filters is an enabler for multiband transmitter architectures using modern radio frequency data convertors. The proposed approach benefits from simple design and design flexibility. The benefit of the proposed approach is the ease of design and the design flexibility. The proposed filters provide the ability to control the frequency, the bandwidth, and the introduction of transmission zeros separately for each band. A number of designs are presented to demonstrate the operation principle and the performance characteristics of the proposed filters. A $2 \times 4$ pole filter has been manufactured and tested with very good obtained results.

English

2 ABSTRACT:An embedded system based colorimeter has been developed for the analysis of copper in waste water. The design is based on the ARM-7 LPC-2148 processor. The data convertor section of the processor is interfaced to the photoelectric sensor of the colorimeter. The inbuilt DAC is used for the control of intensity of incident light produced by light source. The monochromatic colored LEDs are used as source of stable light. Similarly the inbuilt ADC is used to measure the potential corresponding to the transmitted light. The transmitted light is detected and converted into potential by the LDR circuit. The instrumental and the experimental errors introduced due to the absorption by cuvette and the reagent respectively were compensated by the software techniques. In addition to above functions, the software performs the operations of calculation of absorptivity coefficient, detection and estimation of concentration of copper. The developed equipment has been successfully used for the analysis of copper in waste water. The software program can be easily modified for the similar study of other analytes.

Integrated D-band transmitter and receiver for wireless data communication in 65 nm CMOS

A 140 GHz transmitter (Tx) and receiver (Rx) chip set has been developed in 65 nm CMOS by using on---off keying non-coherent modulation to support high speed proximity data communication. To the author's best knowledge, it enables the first integrated multi-Gbps data link in D-band by saving power hungry frequency synthesizer, high speed data convertors and complicated digital signal processor. The Tx and Rx occupy 0.03 and 0.12 mm2 chip areas, respectively. To validate the communication at 140 GHz carrier frequency, a data link has been built to demonstrate up to 2.5 Gbps data rate with power consumption of 115/120 mW for Tx/Rx respectively.

Data Convertors Design for Optimization of the DDPL Family

Data Convertors Design for Optimization of the DDPL Family

New analogue multiplier-divider circuit based on cyclic data convertors

A new method for the realisation of analogue multiplier/divider circuits is presented. The method uses a modified cyclic data convenor that operates sequentially as an A/D convenor and as a D/A multiplying convenor in such a way that it performs the analogue operation vo = vxvy/vz

New approaches in vibroacoustic measurement system design

Recent advances in measurement instrumentation and in computer hardware such as more fully programmable signal conditioners, faster data convertors, processors and other handlers, higher resolution displays, and larger memories invite the development of new vibroacoustic measurement approaches. In this talk, the design and implementation of a new system for measuring radiated and self-noise paths associated with complex, large-scale, immersed structures will be described. New approaches will be presented in the context of software developed or utilized to achieve improved performance of control, processing, display, and analysis functions. Advantages of the new approaches for studies of more subtle and complex vibroacoustic effects will be discussed.

Where and when to use which data converter: A broad shopping list of monolithic, hybrid, and discrete-component devices is available; the author helps select the most appropriate

A broad shopping list of monolithic, hybrid, and discrete-component devices is available; the author helps select the most appropriate data convertor.

Generation of alpha-numeric flight data on bright displays

The paper is concerned with the development of an alpha-numeric generator, the purpose of which is to place aircraft identity, altitude and control information alongside primary or secondary radar returns on scan-converted television displays.The heart of the equipment is the data convertor, which is interfaced to a general-purpose computer and is capable of generating and storing up to ten different situation display pictures. Characters are formed in 5×7 matrixes of dots on the screen. The character pattern and position, as defined by the coded computer word, are stored in magnetic memory and read out at a television rate to produce a bright and flicker-free display.The alpha-numeric generator provides co-ordinate conversion for adapting to the off-centring and range scale of each scan convertor. Velocity vectors representing a future position are generated by the system in response to a request message from the controller to the computer. A functional control panel is provided for each display position, whereby the controller may operate and communicate with the system.A model of the alpha-numeric generator is to be delivered to the Federal Aviation Agency in the early part of 1964.