ISSN:0098-9886    

DOI:10.1002/cta.4490170102

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1989

数据来源: WILEY

摘要:

AbstractThe optimal double side‐band converter, a novel circuit briefly presented in a previous paper,' is a rectifier bridge operating between selective terminations and containing an infinite number of resonant circuits. the circuit performance was justified by considering a finite number of resonant circuits and then letting that number become infinite. This limit process was erroneously handled, and is now corrected, so that the results for the infinite circuit (which were correct) are rigorously validate

ISSN:0098-9886    

DOI:10.1002/cta.4490170103

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1989

数据来源: WILEY

摘要:

AbstractAmong the known FIR digital differentiators, the minimax relative error (MRE) approximations are the most efficient ones, where the weighting coefficients are derived by using an optimization algorithm. This approximation fails at the frequency ω = π if the orderNof the differentiator is odd. A half sample advance (i.e. a delay τ = −1/2) and an evenNbecome necessary to extend the MRE approximation up to ω = χ; these are, however, undesirable features, particularly in large signal processing systems. This paper proposes digital differentiators, which are characterized by maximal linearity of the frequency response at the midband frequency ω = π/2, and gives a mathematical relation for the weighting coefficients. the orderNof the differentiator has been ensured to be odd, and no half sample advance has been used. It has been shown that for relative error (RE) ⩽ 1 per cent, the proposed differentiators are more efficient as compared to those based on the MRE approximation, in terms of multiplications required per sample of the input signalfor all N (Nodd). the proposed approximations are also capable of giving extremely low RE (10−3to 10−6per cent), for narrow midband frequencies, with attractiv

ISSN:0098-9886    

DOI:10.1002/cta.4490170104

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1989

数据来源: WILEY

摘要:

AbstractThe island‐like inclusions that appear inside the range of the return map in Chua's circuit are investigated further. the condition for the creation of a new inclusion is shown to be closely related to the selection rule for the critical curve ø. Moreover, a solution of this problem can also be given in terms of λ, the boundary of the return map's domain, and so in simpler form. the phases of the special trajectories that mark the creation of an inclusion turn out to be virtually invariant through all values of the canonical parameter ρ. Moreover, the phase difference between subsequent creations appears to be close to a constant too. This fact allows one to formulate explicit expressions for the limiting behaviour of the creation cu

ISSN:0098-9886    

DOI:10.1002/cta.4490170105

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1989

数据来源: WILEY

摘要:

AbstractThe present paper describes the design and prototype construction of a serial charge redistribution logarithmic A/D converter (LADC). the LADC uses only two capacitors and has an eight‐bit digital word. It directly converts the input to logarithmic code and is suitable for use with digital systems implementing the sign‐log number system. the conversion is completed in 128 steps (clock cycles). the input dynamic range is four decades and the relative error is 3.7 per cent. A capacitor ratio accuracy of 0.4 per cent is required to keep conversion errors within 1

ISSN:0098-9886    

DOI:10.1002/cta.4490170106

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1989

数据来源: WILEY

摘要:

AbstractThis paper deals with a cascade decomposition of a passive 2n‐port network. after a basic discussion relative to complex‐ and unit‐normalized scattering matrices, necessary and sufficient conditions are presented under which given lossless 2n‐portsD1andD2are simultaneously extractable from the front‐ and back‐ends of the passive 2n‐portN, respectively, to leave a passive 2n‐port remainder Ne. Based on these conditions, some relations between the individual and simultaneous extractability ofD1andD2fromNfor both degenerate and non‐degenerate remaindersNeare discussed. the results are presented in terms of scattering as well as impedance matrices and can be considered as an extension of those giv

ISSN:0098-9886    

DOI:10.1002/cta.4490170107

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1989

数据来源: WILEY

摘要:

AbstractWe present a simple piecewise‐linear circuit which exhibits a chaotic attractor similar to that observed from the well‐known Lorenz equation. Whereas the non‐linearities in the Lorenz equation consists of twoproduct termsbetween two state variables, the non‐linearities in our circuit consists of two ‘uncoupled’ 2‐terminal continuous non‐linear resistors, each characterized by a 2‐segmentv‐icharacteristic.Both experiments and computer simulations of this circuit confirm a Lorenz‐like strange attractor. the nature of the trajectories associated with this attractor is analysed and explained with the help of the circuit's piec

ISSN:0098-9886    

DOI:10.1002/cta.4490170108

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1989

数据来源: WILEY

摘要:

AbstractThis paper presents a novel approach for the design and synthesis of odd‐degree sampled‐data filters. Initially, an efficient iterative scheme is described for the construction of a class of selective linear‐phase distributed bandpass filters with equiripple passband loss response. Then, the filter's transfer function is synthesized using classical distributed circuit networks. Finally, the equivalent switched‐capacitor filter could be constructed. the resulting switched‐capacitor networks are completely insensitive w.r.t. parasitic capacitances, as well as having low Cmax/CminDesign tables and an illustrative example are a

ISSN:0098-9886    

DOI:10.1002/cta.4490170109

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1989

数据来源: WILEY

摘要:

AbstractThis paper describes the theory of two‐dimensional digital filters that are pseudopassive with respect to thelp‐norm of the state vector. As the classical pseudopassive digital filters are a subclass of these filters, the respective theorems referred to stability are also generalized. It is shown that this theory is useful for the two‐dimensional filters that answer with non‐negative‐valued responses to non‐negative‐valued excitations. Such systems are especially suitable for image processing. the synthesis of thel1‐pseudolossless systems is proposed as a tool to guarantee stability of such filters. A technique to obtain local state‐space models for such two‐dimensionall1‐pseudolossless recursive filters with prescribed spatial responses is given. A ‘Gaussian filter’ design illustrates the technique and shows that the proposed two‐dimensionall1‐pseudolossless filters are able to m

ISSN:0098-9886    

DOI:10.1002/cta.4490170110

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1989

数据来源: WILEY

ISSN:0098-9886    

DOI:10.1002/cta.4490170111

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1989

数据来源: WILEY