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Proceedings Paper

SOS Technology For Real-Time Signal Processing
Author(s): J. Saultz; S. Ozga; W. Helbig; A. Feller
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Paper Abstract

SOS technology has definitely come of age. It offers many advantages, it is easy and economical to use, and it has proven performance in a wide range of real-time signal processing applications. The principal advantages of SOS LSI, as far as the designer of real-time systems is con-cerned, are high speed and low power requirement. Often of equal advantage is high device density. These and other advantages are listed in Table 1 along with characteristics that make them possible. Several comparative disadvantages of using SOS have been cited in the past. Most of these have been alleviated, as indicated by the up-to-date evaluations in Table 2.Table 1. What SOS Offers the System Designer_ Advantage T Contributing Factor Low Dynamic. Power Small geometry devices with minimum device capacitance. High Density Elimination of guard bands Wide Range of Complementary Operating Voltages structure. Radiation Resistance Elimination of latch-up and high peak photocurrent. Simplified Design Exotic clocking systems not needed for high-speed static logic. Easy to Model Device performance can be reliably simulated using known dimensions and standard material constants.Table 2. An Update on Historical Disadvantages of SOS Disadvanges Current Evaluation Lack of Advantage) High Cost of Material Cost reduced to com-petitive level by 3-inch wafers and ribbon sapphire. High Densities in Bipolar circuits, Other Technologies dynamic NMOS-memories, and ILL are more dense -- but the power requirement is 4 to 10 times high than for SOS. Low Power Can be, At a trade-off for Achieved for ILL performance. High Speed Can be True, with the large Achieved with choice of components Other Technologies in bulk MOS and bipolar.The basic technologist can argue many more pros and cons for any technology. The systems designer must be cognizant of these pros and cons, but he has to extend his viewpoint to implementation and economics. He wants to design and partition systems in a cost-effective manner. Beyond the SOS combination of power, speed and density advantage are two major implementation assets -- the ready availability of powerful CMOS/SOS microprocessors and memories, and design methods utilizing an array of computer-aided design tools that quickly make concepts realizable in LSI and VLSI arrays. In the following pages, we briefly review three design methods, starting with handcrafted custom design -- which does incorporate some computer aids -- and proceeding to the highly automated standard cell and universal gate array approaches. Then, we get to the proof of the pudding -- descriptions of a range of applications in which SOS circuits and microproc-essors have been central to innovation and success. We end with an indication of progress in SOS technology that the designer of real-time systems will have at his disposal in the next few years.

Paper Details

Date Published: 8 December 1978
PDF: 14 pages
Proc. SPIE 0154, Real-Time Signal Processing I, (8 December 1978); doi: 10.1117/12.938248
Show Author Affiliations
J. Saultz, RCA (United States)
S. Ozga, RCA (United States)
W. Helbig, RCA (United States)
A. Feller, RCA (United States)

Published in SPIE Proceedings Vol. 0154:
Real-Time Signal Processing I
T. F. Tao, Editor(s)

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