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  • 1
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    Applications of SPICE for modeling miniaturized biomedical sensor systems (2000)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: This paper proposes a model for a miniaturized signal conditioning system for biopotential and ion-selective electrode arrays. The system consists of three main components: sensors, interconnections, and signal conditioning chip. The model for this system is based on SPICE. Transmission-line based equivalent circuits are used to represent the sensors, lumped resistance-capacitance circuits describe the interconnections, and a model for the signal conditioning chip is extracted from its layout. A system for measurements of biopotentials and ionic activities can be miniaturized and optimized for cardiovascular applications based on the development of an integrated SPICE system model of its electrochemical, interconnection, and electronic components.
    Keywords: Life Sciences (General)
    Type: IEEE transactions on bio-medical engineering (ISSN 0018-9294); Volume 47; 2; 149-54
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Digital filter realizations using a special-purpose stored-program computer. (1972)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: A special-purpose computer is organized to realize a second-order digital filter in a choice of 11 programming forms. Instructions for the forms are stored in a fast-access READ-ONLY memory. Also, a hard-wired multiplier is employed in the Arithmetic Unit to decrease computation time. The multiplier is organized into uniform functional blocks that are suitable for large-scale integration (LSI). A computer-aided design (CAD) program may be used to select the best filter programming form for a given filter transfer function D(z). The CAD program also aids in the location of the binary point in the data registers of the computer.
    Keywords: COMPUTERS
    Format: text
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  • 3
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    Signal amplitude quantization in digital filters (1969)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: Digital filters response errors due to signal amplitude quantization, resulting from analog-to- digital conversion and arithmetic operations
    Keywords: ELECTRONICS
    Type: U. OF HAWAII, HAWAII INTERNATIONAL CONFERENCE ON SYSTEM SCIENCES, 2ND, U. OF HAWAII; Jan 22, 1969 - Jan 24, 1969; HONOLULU, HI
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Survey of digital filtering (1972)
    In:  CASI
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    Publication Date: 2019-07-13
    Description: A three part survey is made of the state-of-the-art in digital filtering. Part one presents background material including sampled data transformations and the discrete Fourier transform. Part two, digital filter theory, gives an in-depth coverage of filter categories, transfer function synthesis, quantization and other nonlinear errors, filter structures and computer aided design. Part three presents hardware mechanization techniques. Implementations by general purpose, mini-, and special-purpose computers are presented.
    Keywords: ELECTRONICS
    Type: NASA-CR-124166
    Format: application/pdf
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  • 5
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    Two techniques for digital filter design (1970)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Digital controllers, one using a special-purpose computer and the other using a combination of digital and analog techniques, are designed around /1/ computers that simulate the transfer function and interface with the system, and /2/ analog and digital circuits, converters, amplifiers, constant multipliers, and delay lines that form a digital filter.
    Keywords: ELECTRONIC COMPONENTS AND CIRCUITS
    Type: MFS-20015 , MFS-20016
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Organizing a special-purpose computer to realize digital filters for sampled-data systems. (1968)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: Special purpose computer for implementing programmable digital filter used in sampled data control systems
    Keywords: COMPUTERS
    Type: ; ACE(
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  • 7
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    A hybrid realization for sampled-data controllers (1970)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: Sampled data compensators hybrid realization for discrete controllers, selecting canonical representation with minimum number of delay elements
    Keywords: ELECTRONICS
    Type: ; ATA U., BULLETIN (
    Format: text
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  • 8
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    Hardware realization of sampled-data controllers (1974)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: This paper examines the hardware implementation process for digital controllers (filters), beginning with the desired z-domain transfer function of the digital compensator and ending in the selection of a hardware realization scheme. The final hardware realization is shown to be affected by quantization noise, dynamic range considerations, limit cycles, coefficient roundoff, and filter structure. A design example is included to illustrate the implementation process for a digital rate filter for vehicle control of the space shuttle. This paper develops open-loop techniques which may be extended to the closed-loop case.
    Keywords: COMPUTER OPERATIONS AND HARDWARE
    Type: International Federation of Automatic Control, Symposium on Automatic Control in Space; Aug 26, 1974 - Aug 31, 1974; Tsakhkadzor; Soviet Union
    Format: text
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    NASA TECHNICAL REPORTS
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