The Effects of Interconnections on High-Speed Logic Circuits
TL;DR: It is shown that high-speed circuitry must be miniaturized and the implications are discussed.
Abstract: By way of worked examples in typical but somewhat idealized cases the effect on circuit speed of circuit interconnections is studied. The source, calculation and minimization of interconnection crosstalk is also discussed. It is shown that high-speed circuitry must be miniaturized and the implications are discussed.
Citations
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Dissertation•
15 Sep 2015
TL;DR: In this paper, an electrical model of two pairs of interconnects of the ATLAS Phase-1 Upgrade Hadronic Endcap Front-End Crate prototype baseplane is presented and compared in both the time and frequency domain to measured TDR traces and S-parameters.
Abstract: This thesis presents an electrical model of two pairs
of interconnects of the ATLAS Phase-1 Upgrade Hadronic Endcap Front
End Crate prototype baseplane. Stripline transmission lines of the
baseplane are modeled using Keysight Technologies' Electromagnetic
Professional's (EMPro) 3D electromagnetic simulation (Finite
Element Method) and the connectors are modeled using built-in
models in Keysight Technologies' Advanced Design System (ADS). The
model is compared in both the time and frequency domain to measured
Time Domain Reflectometer (TDR) traces and S-parameters. The
S-parameters of the model are found to be within 5% of the measured
S-parameters for transmission and reflection, and range from 25%
below to 100% above for forward and backward crosstalk. To make
comparisons with measurements, the cables used to connect the
prototype HEC baseplane to the measurement system had to be
included in the model. Plots of the S-parameters of a model without
these cables are presented for one pair of interconnects for which
the crosstalk is expected to be the higher than most other
interconnects of the baseplane.%%%%Graduate
2 citations
Cites methods from "The Effects of Interconnections on ..."
...Under these conditions the forward and backward crosstalks are given by [28](1):...
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TL;DR: In this article, the authors characterize some of the available circuits and discuss the problems and the possible gains in applying them to instruments used in experimental physics experiments, including a 50 mc decade prescaler, a 10 mc systems-type decade scaler, an integrating analog-digital converter, and a packaged data acquisition system with a tape perforator output.
Abstract: Monolithic integrated circuits have made tremendous inroads into many areas of electronics during the past year. The purpose of this paper is to characterize some of the available circuits and to discuss the problems and the possible gains in applying them to instruments used in experimental physics. Toward this end, a series of instruments are described that have been designed and constructed and are in use at this laboratory. These include a 50 mc decade prescaler, a 10 mc systems-type decade scaler, a time interval counter, an integrating analog-digital converter, and a packaged data acquisition system with a tape perforator output. These instruments are examined with regard to economy and reliability of operation. Interfacing with existing experimental equipment is discussed and solutions to problems uniquely associated with the use of integrated circuits in physics experiments are defined.
1 citations
TL;DR: In this paper, an integrated matching gate (IMG) is proposed to eliminate line reflections between high-speed integrated digital gates and their effects on reducing the noise immunity, by integrating only one resistor at the gates' input.
1 citations
TL;DR: This short note considers a method of dealing with this multiple problem using frequency domain, time domain, and experimental analysis.
Abstract: The design of present-day logic systems, using circuits with transition times approaching 1 ns, meets with problems unless the transmission lines are properly terminated. It is very inconvenient to match the input and output of a logic circuit to the characteristic impedance of a transmission line, even at the cost of considerable distortion. An alternative method is to use lines of less than 5-cm length to reduce the distortion. However, many applications require longer lines, and some applications also require interconnecting logic circuits at various points along the line. This short note considers a method of dealing with this multiple problem using frequency domain, time domain, and experimental analysis.
1 citations
References
More filters
01 Nov 1954
TL;DR: In this article, a simple configuration of four wires (or two wires and ground) can serve simultaneously as a directional coupler, filter, and transformer, and the coupled lines may be of equal or different impedance.
Abstract: The natural coupling between parallel transmission lines is inherently directional. Very simple and cheap directional couplers can be made which utilize this effect. By introducing appropriate variation of coupling with distance a wide variety of transmission characteristics may be realized, including high-pass (ideally, infinite bandwidth) characteristics. The coupled lines may be of equal or different impedance. Thus, a simple configuration of four wires (or two wires and ground) can serve simultaneously as a directional coupler, filter, and transformer.
215 citations
IBM1
TL;DR: This computer, like the 704, is aimed at scientific problems such as reactor design, hydrodynamics problems, partial differential equations etc., its instruction set and organization are such that it can handle with ease data-processing problems normally associated with commercial applications, such as processing of alphanumeric fields, sorting, and decimal arithmetic.
Abstract: The Stretch Computer project was started in order to achieve two orders of magnitude of improvement in performance over the then existing 704. Although this computer, like the 704, is aimed at scientific problems such as reactor design, hydrodynamics problems, partial differential equations etc., its instruction set and organization are such that it can handle with ease data-processing problems normally associated with commercial applications, such as processing of alphanumeric fields, sorting, and decimal arithmetic.
76 citations
[...]
TL;DR: This paper gives a brief description of work originating in the Computer Group at Manchester University, the name given to a large computing system which can include a variety of peripheral equipments, and an extensive store.
Abstract: This paper gives a brief description of work originating in the Computer Group at Manchester University. Atlas is the name given to a large computing system which can include a variety of peripheral equipments, and an extensive store. All the activities of the system are controlled by a program called the supervisor. Several types of store are used, and the addressing system enables a virtually unlimited amount of each to be included. The primary store consists of magnetic cores with a cycle time of under two microseconds, which is effectively reduced by multiple selection mechanisms. The core store is divided into 512 word "pages"; this is also the size of the fixed blocks on drums and magnetic tapes. The core store and drum store are addressed identically, and drum transfers are performed automatically as described in Section 3. There is a fixed store which consists of a wire mesh into which ferrite slugs are inserted; it has a fast read-out time, and is used to hold common routines including routines of the supervisor. A subsidiary core store is used as working space for the supervisor. The V-store is a collective name given to various flip-flops throughout the computer, which can be read, set, and re-set by reading from or writing to particular store addresses.
28 citations
Book•
[...]
01 Nov 2001
TL;DR: In this article, a brief description of work originating in the Computer Group at Manchester University is given, where the core store is divided into 512 word "pages"; this is also the size of the fixed blocks on drums and magnetic tapes.
Abstract: This paper gives a brief description of work originating in the Computer Group at Manchester University. Atlas is the name given to a large computing system which can include a variety of peripheral equipments, and an extensive store. All the activities of the system are controlled by a program called the supervisor. Several types of store are used, and the addressing system enables a virtually unlimited amount of each to be included. The primary store consists of magnetic cores with a cycle time of under two microseconds, which is effectively reduced by multiple selection mechanisms. The core store is divided into 512 word "pages"; this is also the size of the fixed blocks on drums and magnetic tapes. The core store and drum store are addressed identically, and drum transfers are performed automatically as described in Section 3. There is a fixed store which consists of a wire mesh into which ferrite slugs are inserted; it has a fast read-out time, and is used to hold common routines including routines of the supervisor. A subsidiary core store is used as working space for the supervisor. The V-store is a collective name given to various flip-flops throughout the computer, which can be read, set, and re-set by reading from or writing to particular store addresses.
27 citations
01 Jan 1960
18 citations