VLSI/VHSIC technology poses critical test problems not only at the device level, but also at the system level. The extreme functional complexity and fail-operational redundancy of VLSI systems tends to render conventi...
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VLSI/VHSIC technology poses critical test problems not only at the device level, but also at the system level. The extreme functional complexity and fail-operational redundancy of VLSI systems tends to render conventional performance testing inadequate, not only in terms of failure mode coverage, but also in terms of test-time requirements. The authors propose a design structure in which various subsystems and modules using VLSI devices are related to one another in a hierarchical test scheme based on the reporting of individual, device-level built-in-test (BIT) results. This hierarchical approach offers true consistency between operational (in-flight), organizational, and depot-level test methodologies.
A description is given of the design of a broadband downconverter to cover both 4-GHz and 6-GHz common carrier bands. The downconverter was tested as a replacement for the downconverter in both the MDR-2204 and MDR-23...
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A description is given of the design of a broadband downconverter to cover both 4-GHz and 6-GHz common carrier bands. The downconverter was tested as a replacement for the downconverter in both the MDR-2204 and MDR-2306 4-GHz and 6-GHz radio systems, respectively. Excellent results have been observed in both radio systems. In threshold bit error rate (BER) tests, the downconverter provided 1.2-dB better performance than both radio systems. In overload BER tests, the downconverter showed a 0.5-dB better performance. The features credited for the good performance are: (1) the noise figure of the low-noise amplifier is less than 1.7 dB over the band;(2) the phase noise of the local oscillator is quite low;(3) the two-tone third-order intercept point of the downconverter is above 26 dBm;and (4) the image rejection is greater than 20 dB over the band.
Copper thick-film multilayer technology is evaluated for use as a high-frequency digital interconnect in systems with bit rates up to 600 Mb/s. To help design the interconnect, software tools which calculate the elect...
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Copper thick-film multilayer technology is evaluated for use as a high-frequency digital interconnect in systems with bit rates up to 600 Mb/s. To help design the interconnect, software tools which calculate the electrical parameters and performance for any two-dimensional geometry were developed and are described. The analysis is based on a quasistatic method. A thick-film multilayer test structure with high bandwidth and 50-Ω impedance was realized. The calculated line parameters show good agreement with the measured values.
Several methods of device and circuit modelling are reviewed, followed by a detailed outline of state-of-the-art equivalent circuit and physical modeling techniques applicable to both device and circuit design. It is ...
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Several methods of device and circuit modelling are reviewed, followed by a detailed outline of state-of-the-art equivalent circuit and physical modeling techniques applicable to both device and circuit design. It is noted that the requirement for CAD (computer-aided design) utilities which extend available linear design techniques into the large-signal regime is being met by both equivalent circuit and physical device models, coupled with powerful algorithms such as the harmonic balance technique. The advent of fast physical device models allows the designer to optimize both devices and circuits based on the actual device structure, without resorting to electrical measurements at the design stage. This is particularly important in the design of integrated circuits, where it is essential to minimize the cost of the design-fabrication cycle.< >
The author presents an algorithm for solving nonlinear equations obtained by coefficient matching. This synthesis method is very effective in continuous-time CMOS filter design. The advantages of the proposed method i...
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The author presents an algorithm for solving nonlinear equations obtained by coefficient matching. This synthesis method is very effective in continuous-time CMOS filter design. The advantages of the proposed method in comparison with the Newton method are shown. A procedure called SYNCOM has been written in Pascal to implement the algorithm.< >
Given a nonseparable plane graph G, a path or circuit is called dual if it is also a path or circuit, respectively, in the geometric dual of G. Motivated by a layout design problem of CMOS integrated circuits, the aut...
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Given a nonseparable plane graph G, a path or circuit is called dual if it is also a path or circuit, respectively, in the geometric dual of G. Motivated by a layout design problem of CMOS integrated circuits, the authors consider some problems of partitioning the edges of G into the minimum number of dual paths or circuits. The results include a constructive proof of the fact that the following problems are solvable in polynomial time: determining whether G has a dual circuit; finding a dual Eulerian path or circuit if one exists; and finding the minimum set of dual paths that partitions the edges of G when G has no dual circuits.< >
It is proposed to achieve integrated diagnostic systems for advanced rotorcraft by combining the concepts of design-for-testability (DFT), expert systems, advanced maintenance architectures, portable maintenance aids,...
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It is proposed to achieve integrated diagnostic systems for advanced rotorcraft by combining the concepts of design-for-testability (DFT), expert systems, advanced maintenance architectures, portable maintenance aids, and electronic publications. Mechanical and avionic systems of the rotorcraft would both be covered by the diagnostic system. The problem is broken down into mechanical diagnostics, in-flight diagnostics, and ground-based diagnostics.< >
A voltage-following current mirror is shown to be a useful building block in the design of both single stage, high gain cascade amplifiers and differential to single-ended converters using n-channel depletion-mode GaA...
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A voltage-following current mirror is shown to be a useful building block in the design of both single stage, high gain cascade amplifiers and differential to single-ended converters using n-channel depletion-mode GaAs MESFETs. After reviewing past work on such single-stage amplifiers and converters, the authors describe their combination to realize high gain, differential input, operational amplifiers. Performance results are presented.< >
The authors develop the concept of the indefinite S-matrix and, in particular the port-based indefinite S-matrix, which corresponds to the low-frequency indefinite-impedance matrix and which is the dual of the termina...
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The authors develop the concept of the indefinite S-matrix and, in particular the port-based indefinite S-matrix, which corresponds to the low-frequency indefinite-impedance matrix and which is the dual of the terminal-based indefinite S-matrix. Fundamental relationships between this matrix and the indefinite-impedance matrix are presented. Its fundamental property and conversion relationships between the various normal S-matrices of the same network are examined. These derivations are all based on the complex-frequency plane. Finally, applications are discussed in microwave parallel feedback design, in performance comparison between various configuration, and in S-parameter measurement.< >
A family of efficient and practical interpolators for interpolated FIR (finite-impulse-response) filters using cyclotomic polynomials is presented. The interpolators can be applied to bandpass filters as well as lowpa...
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A family of efficient and practical interpolators for interpolated FIR (finite-impulse-response) filters using cyclotomic polynomials is presented. The interpolators can be applied to bandpass filters as well as lowpass/highpass filters without multiplications. They mitigate the inconvenience in selecting a practical interpolation factor: consequently, the novel family provides for a further saving in computational complexity. Some design examples are given.< >
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