By Topic

Circuits and Systems, IEEE Transactions on

Issue 2 • Date Feb 1982

Filter Results

Displaying Results 1 - 9 of 9
  • On a recent extrapolation procedure for band-limited signals

    Publication Year: 1982 , Page(s): 116 - 117
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (240 KB)  

    A simplified characterization of the class of signals to which Cadzow's extrapolation procedure [1] applies is presented. The theoretical restrictions are interpreted to show that numerical implementations of the algorithm apply to all band-limited signals. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Performance limitations of matched shunt-compensated broad-band cascode amplifiers

    Publication Year: 1982 , Page(s): 119 - 123
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (408 KB)  

    This paper presents gain-bandwidth limits for matched small-signal amplifiers that use cascode-connected bipolar junction transistors (BJT's) and shunt compensating admittances. The limits apply for conditions of flat, maximal broad-band gain and flat port reflections. The paper includes stability and sensitivity analyses, an amplifier synthesis procedure, and an illustrative design example. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Design centering by yield prediction

    Publication Year: 1982 , Page(s): 88 - 96
    Cited by:  Papers (33)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1072 KB)  

    Design centering is an appropriate design tool for all types of electrical circuits to determine the nominal component values by considering the component tolerances. A new approach to design centering will be presented, which starts at the initial nominal values of the circuit parameters and improves these nominal values by maximizing the circuit yield step by step with the aid of a yield prediction formula. Using a variance prediction formula additionally, the yield maximization process can be established with a few iteration steps only, whereby a compromise between the yield improvement and the decrease in statistical certainty must be made in each step. A high-quality interactive optimization method is described which allows a quantitative problem diagnosis. The yield prediction formula is an analytical approximation based on the importance sampling relation. This relation can also be used to reduce the sample size of the necessary Monte Carlo analyses. Finally the efficiency of the presented algorithm will be demonstrated on a switched-capacitor filter. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Linear eigenvalue -S matrix element relations for the regular polyhedra

    Publication Year: 1982 , Page(s): 76 - 81
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (688 KB)  

    Eigenvalue- S matrix element relations for some common multiport devices with two-fold symmetry have recently been derived using a technique based on group theory. In this contribution this same technique is applied to derive linear eigenvalue- S matrix element relations for the five regular polyhedra. Using these relations the coupling properties of matched networks with such symmetry are discussed. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Predistorted all-pass networks

    Publication Year: 1982 , Page(s): 117 - 119
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (280 KB)  

    In passive all-pass networks, the result of using components having finite Q is the appearance of notches in the frequency response, and an increase in the height of the delay peaks. Better designs can be obtained by, first, using predistortion to position the transmission zeros, and, second, by restoring the all-pass property with bump equalizers. Complete formulas are given. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Band faults: Efficient approximations to fault bands for the simulation before fault diagnosis of linear circuits

    Publication Year: 1982 , Page(s): 81 - 88
    Cited by:  Papers (24)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (792 KB)  

    "Band faults," the approximate movements of nominal worstcase boundaries with catastropic faults, are much more efficiently computed than the "fault bands" that they approximate. Derived from a simulation before test, band faults can be used to create a fault dictionary that is supposed to isolate single element catastrophic faults. By no means general, the approach when applied to several example linear circuits nonetheless has yielded promising results. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Dynamic model for the analog multiplier

    Publication Year: 1982 , Page(s): 65 - 76
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1160 KB)  

    Under reasonable assumptions, it is shown that the dynamic behavior of an analog multiplier driven by band-limited signals \upsilon _{X}(t) and \upsilon _{Y}(t) can be modeled by \upsilon _{0} = K[\upsilon _{X}\upsilon _{Y} -T_{A}\dot{\upsilon }_{X}\upsilon _{Y} - T_{B}\upsilon _{X}\dot{\upsilon }_{Y}] . The three model parameters K, T_{A} , and T_{B} can be determined by frequency-domain measurements. This simple equation can in turn be modeled by a circuit containing 2 linear capacitors, 2 linear controlled sources, and an ideal multiplier described by \upsilon _{0}= K \upsilon _{X} \upsilon _{Y} . View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Topological formulations for the coefficient matrices of state equations for switched-capacitor networks

    Publication Year: 1982 , Page(s): 106 - 115
    Cited by:  Papers (10)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1064 KB)  

    This paper describes new topological formulas for the coefficient matrices of the state equation for a switched-capacitor (SC) network. The topological formulas are derived from a differential state equation describing an RC network with resistances (R, r) of OFF- and ON-switches, respectively. Differing from historical nodal analyses, this method is useful for the exact analysis of large scale SC networks, because the use of inverse matrices is not required and each network-construction-change in each switching time interval is disposed by a switching diagonal matrix with diagonal binary elements "1" and "0" for ON- and OFF-Switches, respectively. New characteristic matrices will be applied in order to obtain the coefficient matrices efficiently by using recursive equations, which are suitable for computer-aided analysis. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Operational amplifier gain - bandwidth product effects on the performance of switched-capacitor networks

    Publication Year: 1982 , Page(s): 96 - 106
    Cited by:  Papers (15)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1160 KB)  

    A method of analyzing switched-capacitor (SC) filters which incorporates a single-pole model of the operational amplifiers (op amp's) is presented. Closed-form algebraic expressions for filter transfer functions in the z -domain are obtained which are computationally more efficient than time-domain methods. The necessity for including a frequency dependent model of the op amp rather than the common finite gain model in doing a performance analysis, especially when considering stability, is emphasized. To illustrate the method of analysis, an analog integrator, an analog second-order bandpass filter, and their SC counterparts are considered. The s -domain performance of the analog footnote[1]{circuits} is compared with the z -domain performance of the sampled-data configurations to show how the finite gain-bandwidth product (GB) of the op amp's affects the respective topologies. These comparisons show that the effects of switching rates and switching arrangements on filter performance are strongly dependent upon the GB product of the op amps. These comparisons also emphasize the fact that it is not sufficient to investigate the effect of the operational amplifiers on the performance of an analog filter to predict the performance of a SC filter derived from the analog configuration. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.