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IBM Journal of Research and Development

Issue 4 • Date July 1968

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Displaying Results 1 - 11 of 11
  • Automatic Dynamic Response Analyzer

    Publication Year: 1968 , Page(s): 286 - 299
    Cited by:  Papers (3)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (867 KB)  

    The Automatic Dynamic Response Analyzer (ADRA) is a laboratory tool for developing improved methods of characterizing and measuring the dynamic performance of integrated circuit logic packages. ADRA consists of ensembles of computer controlled electronic equipment which provide a suitable electrical environment for the logic unit under examination, subject the unit to appropriate patterns of shaped pulses, measure and digitize the input/output waveforms, and process the resulting data. This paper describes the ADRA system, its organization and hardware characteristics, and an example of its use. View full abstract»

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  • An Application of the Automatic Dynamic Response Analyzer

    Publication Year: 1968 , Page(s): 300 - 306
    Cited by:  Papers (1)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (426 KB)  

    An experiment to obtain the coefficients of a circuit delay equation was designed and implemented on the ADRA/M44 system in order to gain experience in the system's use. The process involves automatic calibration and diagnostic procedures, data collection under computer control and multivariate regression analysis. Some conclusions are drawn about the planning and use of computer controlled instruments such as ADRA. View full abstract»

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  • A Balanced Capacitor Read-Only Storage

    Publication Year: 1968 , Page(s): 307 - 317
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (690 KB)  

    The design of a control storage system of 90 nsec access time and 200 nsec cycle time with permanently stored microinstructions is described. The storage medium used is the capacitive coupling between two groups of orthogonal conductors forming an information plane and a sense plane. There are 2816 words of 100 bits each, divided over two gates. The selection of an address line in the information plane is achieved through a transistor selection matrix. The output signal is sensed differentially at the mid-point of the sense line, which is matched at both ends. The sense amplifier output plus a “strobe” pulse set a latch for a portion of the cycle time and this provides the necessary inputs to the central processing unit. The major contributions to noise, such as sneak-path noise and select noise, are discussed and evaluated. The timing of the different pulses necessary to drive the array and the resulting outputs are explained and the marginal effects of time and amplitude variations are considered. Information can be changed off-line by replacing bit planes. Transcription of information in the bit planes is fully automated and can be speedily accomplished. View full abstract»

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  • A New Technique for Wide-Band Video Recording

    Publication Year: 1968 , Page(s): 318 - 322
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (346 KB)  

    An efficient means for distributing the information contained in a wide-band analog signal over two limited bandwidth channels is provided by using frequency modulation and “zero-crossing counting.” The new technique should accommodate at least twice the bandwidth that can be recorded or transmitted by the usual FM methods. Experimental results with a two-channel magnetic tape system confirm this expectation. View full abstract»

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  • Pressurized High-Speed Development of Diazo Films

    Publication Year: 1968 , Page(s): 323 - 330
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (604 KB)  

    The combination of a new high-speed process and developer unit which uses pressurized anhydrous ammonia gas offers a significant increase in the speed of developing diazo photomaterials. In addition to being up to 100 times faster than conventional ambient-pressure ammonia development processes, the new process and developer provide both flexibility and uniformity of sensitometric characteristics. The unpleasant odor and corrosive character of ammonia gas required a means for positively sealing the film surface to the processing device and a means for disposing of residual ammonia gas remaining in the device at the end of the processing cycle. A developer platen, designed to meet these needs, also achieves uniform image development by utilizing the entering flow of ammonia gas to wash entrapped ambient air from the film surface and into a small reservoir. The process and its relatively simple hardware have been incorporated into an experimental photo-image converter to provide “on-line” input and output of photo-images from a random access image file. The process and a wash-type developer are used in the IBM 9950, 9954 and 9955 diazo aperture card copiers. View full abstract»

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  • An Application of the Cooley-Tukey Algorithm to Equalization

    Publication Year: 1968 , Page(s): 331 - 334
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (373 KB)  

    A new method is proposed to determine the tap settings of a delay-line filter for distortion correction of digital data after transmission by a voice line. The procedure described achieves approximately the optimal tap settings by solving a system of linear equations with a circulant matrix of coefficients. When the fast Fourier transform algorithm of Cooley and Tukey is used, the resulting quantity of computations is considerably smaller than in other known methods. Therefore, much faster equalization can be achieved. View full abstract»

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  • Implicit Implementation of the Weighted Backward Euler Formula

    Publication Year: 1968 , Page(s): 335 - 336
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (243 KB)  

    This communication describes how the weighted backward Euler formula, as applied to analyze electromechanical systems, can be implicitly implemented by replacing capacitors and inductors by resistors and voltage or current sources, respectively, and by replacing the driving functions by their first differences. This replaces the set of differential equations, which describes the capacitive voltages and the inductive currents, by a set of algebraic first difference equations. View full abstract»

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  • Recent Papers by IBM Authors

    Publication Year: 1968 , Page(s): 337 - 339
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (263 KB)  

    Reprints of the papers listed here may usually be obtained most efficiently by writing directly to the authors. The authors' IBM divisions and locations are identifed as follows: ASDD is the Advanced Systems Development Division; CD, Components Division: DPD, Data Processing Division; FSD, Federal Systems Division; RES, Research Division; and SDD, Systems Development Division. East Fishkill, Endicott, Kingston, Owego, Poughkeepsie, and Yorktown Heights are in New York; Los Gatos, Palo Alto, and San Jose, California; Gaithersburg, Maryland; Rochester View full abstract»

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  • Patents Recently Issued to IBM Inventors

    Publication Year: 1968 , Page(s): 340 - 341
    Save to Project icon | PDF file iconPDF (292 KB)  
    Freely Available from IEEE
  • Authors

    Publication Year: 1968 , Page(s): 342 - 343
    Save to Project icon | PDF file iconPDF (244 KB)  
    Freely Available from IEEE
  • Contents of previous two issues

    Publication Year: 1968 , Page(s): 344 - 345
    Save to Project icon | PDF file iconPDF (261 KB)  
    Freely Available from IEEE

Aims & Scope

The IBM Journal of Research and Development is a peer-reviewed technical journal, published bimonthly, which features the work of authors in the science, technology and engineering of information systems.

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Meet Our Editors

Editor-in-Chief
Clifford A. Pickover
IBM T. J. Watson Research Center