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  • 1995-1999  (3)
  • 1
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    Method of Implementing Digital Phase-Locked Loops (1997)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: In a new formulation for digital phase-locked loops, loop-filter constants are determined from loop roots that can each be selectively placed in the s-plane on the basis of a new set of parameters, each with simple and direct physical meaning in terms of loop noise bandwidth, root-specific decay rate, and root-specific damping. Loops of first to fourth order are treated in the continuous-update approximation (B(sub L)T approaches 0) and in a discrete-update formulation with arbitrary B(sub L)T. Deficiencies of the continuous-update approximation in large-B(sub L)T applications are avoided in the new discrete-update formulation.
    Keywords: Electronics and Electrical Engineering
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Controlled-Root Approach To Digital Phase-Locked Loops (1995)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Performance tailored more flexibly and directly to satisfy design requirements. Controlled-root approach improved method for analysis and design of digital phase-locked loops (DPLLs). Developed rigorously from first principles for fully digital loops, making DPLL theory and design simpler and more straightforward (particularly for third- or fourth-order DPLL) and controlling performance more accurately in case of high gain.
    Keywords: ELECTRONIC SYSTEMS
    Type: NPO-18757 , NASA Tech Briefs (ISSN 0145-319X); 19; 4; P. 40
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Reducing Truncation Error In Integer Processing (1995)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Improved method of rounding off (truncation of least-significant bits) in integer processing of data devised. Provides for reduction, to extremely low value, of numerical bias otherwise generated by accumulation of truncation errors from many arithmetic operations. Devised for use in integer signal processing, in which rescaling and truncation usually performed to reduce number of bits, which typically builds up in sequence of operations. Essence of method to alternate direction of roundoff (plus, then minus) on alternate occurrences of truncated values contributing to bias.
    Keywords: MATHEMATICS AND INFORMATION SCIENCES
    Type: NPO-18968 , NASA Tech Briefs (ISSN 0145-319X); 19; 2; P. 80
    Format: text
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    NASA TECHNICAL REPORTS
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