Clock synchronization in the presence of malicious faults is one of the main problems associated with the design of a multiprocessor system. Although over the past few years many different algorithms have been propose...
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(纸本)0818606754
Clock synchronization in the presence of malicious faults is one of the main problems associated with the design of a multiprocessor system. Although over the past few years many different algorithms have been proposed for overcoming this problem, they are not suitable for a large real-time multiprocessor system due to their excessive time overhead and/or large number of interconnections. A new method is proposed that uses phase-locked clock synchronization, thus requiring little time overhead, and uses only 20-30% of the total number of interconnections required by the other methods for almost no loss in the synchronizing capabilities. This drastic reduction in the total number of interconnections is made possible by grouping the various clocks in the system into many different clusters and then treating the clusters themselves as single clock units as far as the network is concerned. The method is significant in that regardless of their size, multiprocessor systems can be built at relatively little cost without sacrificing both the synchronization and fault tolerance capabilities. To show the feasibility of the method, an example hardware implementation is presented.
design and performance of analog phase shifters using hyperabrupt varactors with linear phase versus voltage is presented. Phase linearity of 22 degrees per volt +-8 percent was achieved for a 100 degree S-band device...
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design and performance of analog phase shifters using hyperabrupt varactors with linear phase versus voltage is presented. Phase linearity of 22 degrees per volt +-8 percent was achieved for a 100 degree S-band device with a phase deviation of 1 degree from linearity. At X-band, linear phase control of 270 degrees was achieved. The selection of the varactor diode capacitance versus voltage and matching circuits for linear performance are presented.
RF magnetron-sputtered piezoelectric films on silicon semiconductor substrates provide the basis for high Q, temperature-stable, bulk acoustic resonators in monolithic, UHF signal processing circuits. This paper descr...
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RF magnetron-sputtered piezoelectric films on silicon semiconductor substrates provide the basis for high Q, temperature-stable, bulk acoustic resonators in monolithic, UHF signal processing circuits. This paper describes the design of UHF oscillators using such resonators as the frequency-controlling elements. RF circuit analysis/optimization software has been used for determining resonator equivalent electrical circuit parameters and oscillator sustaining-stage optimum small-signal impedance characteristics, based on automated measurement of resonator and transistor S-parameters. Oscillator circuits have been designed for potential implementation using silicon and GaAs technology. A prototype oscillator has been fabricated that is realizable in monolithic form and allows resonator utilization as a one port. Measurement of oscillator output-signal phase-noise sideband spectra indicates achievement of L(f) = -110 dB/Hz at 1 kHz carrier offset frequency.
Nine electronic circuit design centering problems were presented to workers who have devised design centering algorithms. The results obtained are presented in order to acquaint potential users of design centering wit...
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Nine electronic circuit design centering problems were presented to workers who have devised design centering algorithms. The results obtained are presented in order to acquaint potential users of design centering with its capabilities and requirements.
Proceedings, presented in three volumes, includes 376 papers, of which 5 are in the form of only an abstract. The material covers a wide variety of subjects concerned with the theory, design and analysis of electric a...
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Proceedings, presented in three volumes, includes 376 papers, of which 5 are in the form of only an abstract. The material covers a wide variety of subjects concerned with the theory, design and analysis of electric and electroniccircuits as well as control systems. Topics considered include: speech and image processing for communications, test technology for large-scale systems, FIR digital filters, applications of number-theoretic transforms, switched-capacitor networks, linear and nonlinear systems, dynamic circuits, optimization of electric power systems, personal computers, CAD, approximation, sensitivity and passive design of filters, digital signal processing, system modeling and simulation, active filters, data converters, robotics, VLSI circuits, 2-D filters, adaptive and time-varying filters, software, distributive systems, HF filtering, fault analysis, amplifier design, design centering and yield optimization, graph theory, laser trimming, matroids, and flow graphs.
The Ferranti advanced workstation or Silicon design System has evolved from many years experience of ULA design and represents more than 100 man years of software development. It was produced to meet the needs of desi...
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The Ferranti advanced workstation or Silicon design System has evolved from many years experience of ULA design and represents more than 100 man years of software development. It was produced to meet the needs of design engineers, working in their own offices, producing complete complex electronicsystems on one, or a series of, ULA's.
The design problem of large electrical circuits with discrete components is considered, with their nominal values taken from a finite set of manufacturing values and their actual values allowed to change randomly with...
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The design problem of large electrical circuits with discrete components is considered, with their nominal values taken from a finite set of manufacturing values and their actual values allowed to change randomly within fixed tolerances. For solving this problem, a cut algorithm is presented, which is also suitable for the nonconvex case. If a solution exists, the algorithm has guaranteed convergence.
An exact design procedure for LDI type leapfrog Switched-Capacitor (SC) filters is presented. We introduce z variable transducer and characteristic functions similar to these functions of doubly terminated reactance f...
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An exact design procedure for LDI type leapfrog Switched-Capacitor (SC) filters is presented. We introduce z variable transducer and characteristic functions similar to these functions of doubly terminated reactance filters. The element values are obtained by the z-domain continued fraction expansion, but no reference to the original LCR filters themselves. From these discussions, we also derive the exact representation of low sensitivity property for leapfrog SC filters.
Automatic gain control circuits are used often in communications systems to normalize the basic amplitude of a signal used in phase, frequency, or amplitude modulation schemes. A new AGC design is presented. Its key f...
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Automatic gain control circuits are used often in communications systems to normalize the basic amplitude of a signal used in phase, frequency, or amplitude modulation schemes. A new AGC design is presented. Its key feature is in the manner of gain control. While similar in nature to earlier designs, a new biasing scheme allows the range of control voltage variation V to be up to 4 v. 1 Ref.
The comparator is the most important component in Analog-to-Digital Converters (ADCs). High-gain amplifiers are traditionally used in comparators. For high speed ADC applications, these comparators must simultaneously...
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The comparator is the most important component in Analog-to-Digital Converters (ADCs). High-gain amplifiers are traditionally used in comparators. For high speed ADC applications, these comparators must simultaneously provide high gain and large bandwidth. This requirement is not always met. A new approach to comparator design is thus necessary to meet the requirements of high speed ADCs. We have developed a new class of comparators that combine the high frequency operation of GaAs FETs with their excellent switching characteristics. The principles of operation and the design of these comparators for 2 and 3 bit flash ADCs are reviewed. Fabrication of these monolithic ICs and their performance at gigahertz sampling rates are described.
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