NASA Scientific and Technical Aerospace Reports

Fault Diagnosis of Piecewise-Linear Circuits; Variable Step Size Methods for the LMS Adaptive Algorithm; Implementation
of the Optimum Block Adaptive Algorithm in the Frequency Domain; and The LMS Algorithm Applied to High Speed
Adaptive Digital Signal Processing.
Derived from text
Analog Circuits; Integrated Circuits; Man Machine Systems; Signal Processing; Real Time Operation; Pipelining
(Computers); Parallel Processing (Computers); Neural Nets
20060002105 Nebraska Univ., Lincoln, NE, USA
Active RC-Building Blocks for MOSFET-C Integrated Filters
Smith, Shirley; Liu, F.; Ismail, Mohammed; 1987 IEEE International Symposium on Circuits and Systems, Volume 2; 1987,
pp. 342-346; In English; See also 20060002103
Contract(s)/Grant(s): NSF ENG-84-51103; SRC-85-11-066; Copyright; Avail.: Other Sources
First and second order building blocks For MOSFET-C implementation are presented. The new topologies do not require
fully balanced signals for nonlinearity cancellation. The effects of the op-amp Finite gain bandwidth, time constant mismatch
and power supply rejection are studied. Comparisons with respect to the nonideal effects are made and the design trade-offs
are investigated.
Author
Field Effect Transistors; Bandwidth; Time Constant; Nonlinear Filters
20060002107 Cornell Univ., NY, USA
Stability Boundaries of Nonlinear Systems
Chiang, Hsiao-Dong; Wu, Felix, F.; Varaiya, Pravin; 1987 IEEE International Symposium on Circuits and Systems, Volume
2; 1987, pp. 410-413; In English; See also 20060002103
Contract(s)/Grant(s): DE-AC01-84-CE76257; Copyright; Avail.: Other Sources
A complete characterization of the stability boundaries for a class of nonlinear autonomous dynamic systems is presented.
The stability boundary of a stable equilibrium point is shown to consist of the stable manifolds of all the equilibrium points
on the stability boundary. Necessary and sufficient conditions are derived to determine whether a given equilibrium point is
on the stability boundary. Applications of the results are discussed.
Author
Nonlinear Systems; Stability; Eigenvalues; Boundaries
20060002108 West Virginia Univ., Morgantown, WV, USA
Implementation of the Optimum Block Adaptive Algorithm in the Frequency Domain
Spania, Andreas S.; Mikhael, Wasfy B.; 1987 IEEE International Symposium on Circuits and Systems, Volume 2; 1987,
pp. 426-429; In English; See also 20060002103
Contract(s)/Grant(s): N00014-85-K-2003; Copyright; Avail.: Other Sources
In this paper a time-varying convergence factor mu is proposed for the Frequency-Domain LMS Adaptive Algorithm,
which results in a new algorithm, namely the Frequency-Domain Optimum Block Algorithm (FOBA). The FOBA is actually
the frequency-domain implementation of the recently proposed time-domain Optimum Block Algorithm (OBA). This
implementation results in computational savings in comparison with the OBA and performance enhancement relative to the
Frequency-Domain LMS Algorithm.
Author
Algorithms; Frequency Domain Analysis; Convergence
20060002109 NEC Corp., Japan
Constraints Analysis for Oversampling A-to-D Converter Structures on VLSI Implementation
Yukawa, Akira; 1987 IEEE International Symposium on Circuits and Systems, Volume 2; 1987, pp. 467-472; In English; See
also 20060002103; Copyright; Avail.: Other Sources
Requirements, applied to analog components and characteristics for oversampling A-to-D converter structures with
second order loop transfer function were analyzed through numerical and mathematical analyses. The results suggest that a
first order predictive encoder, with first order noise shaping, is best suited to high resolution future VLSI implementation. It
is most difficult to achieve a theoretical second order Delta-Sigma modulation signal-to-noise ratio, because of the amplifier
performance requirements. The operational amplifier performance requirements. The operational amplifier gain should only
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