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Träfflista för sökning "AMNE:(TEKNIK OCH TEKNOLOGIER) srt2:(1970-1979)"

Sökning: AMNE:(TEKNIK OCH TEKNOLOGIER) > (1970-1979)

  • Resultat 51-60 av 1451
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51.
  • Jeppson, Kjell, 1947, et al. (författare)
  • Retention Testing of MNOS LSI Memories
  • 1979
  • Ingår i: IEEE Journal of Solid-State Circuits. - 0018-9200. ; 14:4, s. 723-729
  • Tidskriftsartikel (refereegranskat)abstract
    • User-oriented test methods for MNOS LSI memories with built-in test modes have been developed. Their application is demonstrated on the commercial ER3401 memory. The memory retention is evaluated in two cases-the static retention time in power-down or in stand-by and the read retention during repeated reading, i.e., the maximum number of read cycles. In the first case, the two loss mechanisms, tunneling and thermal excitation of stored charge are evaluated separately and their influence is combined. In the second case, the limiting mechanism is slow writing by the read signal. On bases of these investigations, a static retention time of 60 yr at 70ºC and 2 yr at 125ºC is predicted and a read retention of 3x10^11 read cycles at 70ºC and 2x10^9 cycles at 125ºC is found for the ER3401.
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52.
  • Jeppson, Kjell, 1947, et al. (författare)
  • The effects of impurity redistribution of the subthreshold leakage current in CMOS n-channel transistors
  • 1976
  • Ingår i: Solid-State Electronics. - : Elsevier BV. - 0038-1101. ; 19:1, s. 83-85
  • Tidskriftsartikel (refereegranskat)abstract
    • A study of subthreshold leakage current in n-channel transistors on low threshold voltage CMOS circuits has been made. Redistribution of impurities at the silicon surface during thermal oxidation is shown to be the main cause of excess subthreshold leakage current. Processing techniques to minimize this leakage have been developed.
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53.
  • Jeppson, Kjell, 1947, et al. (författare)
  • Unintentional writing of a FAMOS memory device during reading
  • 1976
  • Ingår i: Solid-State Electronics. - 0038-1101. ; 19:6, s. 455-457
  • Tidskriftsartikel (refereegranskat)abstract
    • A FAMOS cell may be unintentionally written during repeated reading. The temperature dependence of this failure process was studied and it is shown that the worst case for unintentional charging of a FAMOS device occurs at low temperatures. This is qualitatively explained by a simple model including the temperature dependence of preavalanche carrier multiplication and hot electron injection.
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54.
  • Johannesson, Rolf, et al. (författare)
  • Further results on binary convolutional codes with an optimum distance profile
  • 1978
  • Ingår i: IEEE Transactions on Information Theory. - 0018-9448. ; 24:2, s. 264-268
  • Tidskriftsartikel (refereegranskat)abstract
    • Fixed binary convolutional codes are considered which are simultaneously optimal or near-optimal according to three criteria: namely, distance profiled, free distanced_{ infty}, and minimum number of weightd_{infty}paths. It is shown how the optimum distance profile criterion can be used to limit the search for codes with a large value ofd_{infty}. We present extensive lists of such robustly optimal codes containing rateR = l/2nonsystematic codes, several withd_{infty}superior to that of any previously known code of the same rate and memory; rateR = 2/3systematic codes; and rateR = 2/3nonsystematic codes. As a counterpart to quick-look-in (QLI) codes which are not "transparent," we introduce rateR = 1/2easy-look-in-transparent (ELIT) codes with a feedforward inverse(1 + D,D). In general, ELIT codes haved_{infty}superior to that of QLI codes.
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58.
  • Johannesson, Rolf (författare)
  • On the distribution of computation for sequential decoding using the stack algorithm
  • 1979
  • Ingår i: IEEE Transactions on Information Theory. - 0018-9448. ; 25:3, s. 323-331
  • Tidskriftsartikel (refereegranskat)abstract
    • An analytical procedure is presented for generating the computational distribution for the Zigangirov-Jelinek stack algorithm. Multitype branching processes are employed to develop a procedure for estimating sequential decoding computation, without the need for simulation, but with sufficient accuracy to be a valid design tool. At information rates about the cutoff rateR_{o}the calculated computational performance is virtually Identical to that obtained by time consuming simulations.
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59.
  • Johannesson, Rolf (författare)
  • On the error probability of general trellis codes with applications to sequential decoding
  • 1977
  • Ingår i: IEEE Transactions on Information Theory. - 0018-9448. ; 23:5, s. 609-611
  • Tidskriftsartikel (refereegranskat)abstract
    • An upper bound on the average error probability for maximum-likelihood decoding of the ensemble of randomL-branch binary trellis codes of rateR = 1/nis given which separates the effects of the tail lengthTand the memory lengthMof the code. It is shown that the bound is independent of the lengthLof the information Sequence whenM geq T + [nE_{VU}(R)]^{-1} log_{2} L. The implication that the actual error probability behaves similarly is investigated by computer simulations of sequential decoding utilizing the stack algorithm. These simulations confirm the implication which can thus be taken as a design rule for choosingMso that the error probability is reduced to its minimum value for a givenT.
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60.
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