G.S. MoschytzandJ. Neirynck (Editors)

CIRCUIT THEORYAND DESIGN

PROCEEDINGS OF THE 1978 EUROPEAN

CONFERENCE ON CIRCUIT THEORY AND DESIGN

UNIVERSITATSBIBLIOTHEKHANNOVER

TECHNISCHEINFORMATIONS8IBLIOTHEK

^ ..

6GEOR'GI ST-SAPHORIN

CONTENTS

FOREWORD 27

INAUGURAL LECTURE

ON THE CONVERGENCE OF INFINITE RESISTANCE

LADDERS

V. Belevitch, MBLE Res. Lab., Brussels, Belgium 29

Session Al

ACTIVE NETWORK THEORY

Chairman: L.T. Bruton, University of Calgary,

Calgary, Canada

Al.l: "The Equivalence of Active-Filter

Structures"

A. Grabel, Northeastern University, Boston,

Mass, USA 47

Al .2: "Generation of Active RC-Circuits by

the Nullor Equivalency Concept"

R, Palomera-Garcia, EPFL, Lausanne,

Switzerland 53

A1.3: "Some Classes of Equivalent Transfor¬

mations of Active Ladder Networks"

A. Gchocki, S, Osowski, Warsaw TechnologicalUniversity, Warsaw, Poland 58

Al .4: "General Synthesis of Active Filters with

Identical Biquadratic Sections"

R.M. Biernacki, B. Styblinska, Warsaw Techno¬

logical University, Warsaw, Poland 63

A1.5: "Signal Flow Filters"

/. Haritantis, University of Patras, Patras, Greece. 68

A1.6: "Active R Network Realization for the

N-th Order Voltage Transfer Functions: Signal-Flow Graph Approach"C. Acar, T. Ozker, Technical University of

Istanbul, Istanbul, Turkey 73

6 ECCTD'78 PROCEEDINGS

Session A2

NETWORK AND SYSTEM THEORY

Chairman: M. Biaiko, Gdansk Polytechnic, Gdansk, Poland

A2.1: "The General Impedance Leveling Process

Generating a Complete Class of Equivalent Lad¬

der Networks"

W. Ulbrich, B. Dasch, Technical University Munich,

Munich, West Germany 78

A2.2: "Short-Circuit Conductance Matrix Synthe¬sis: VCVS Gain Selection"

B.B. Stamenkovic, Institute of Nuclear Sciences,

Belgrade, Yugoslavia 83

A2.3: "A Frequency Domain Method to Find

the Initial Values in Active RLC Networks"

M. Koeksal, Middle East Technical University,

Gaziantep, Turkey 88

A2.4; "Sufficient Conditions for the Unique Sol¬

vability of Networks Containing Linear Memory-

less 2-ports"

A. Recski, Research Institute for Telecommuni¬

cation, Budapest, Hungary 93

A2.5: "Terminal Equations of Algebraic n-Ports

Obtained by Parallel Connecting n-Ports"

A.E Sen, Y. Tokad, Technical University

of Istanbul and Marmara Research Institute,

Istanbul, Turkey 98

A2.6: "An Algebra of Transfer Functions for

Distributed Linear Time-Invariant Systems"F.M. Collier, University of Namur, Namur,

Belgium;C.A. Desoer, University of California, Berkeley,CA, USA 103

CONTENTS

Session A3

PASSIVE NETWORK THEORY

Chairman: M.M. Milic, University of Belgrade,

Belgrade, Yugoslavia

A3.1: "Parametric Representation of Brune

Functions"

A. Fettweis, University ofthe Ruhr, Bochum,

West Germany 106

A3.2: "An Additional Canonical Section for

LC One-Port Synthesis"Dao Manh Cuong, M. Hosier, EPFL, Lausanne,

Switzerland Ill

A3.3: "Equivalent RLC Networks on the

Basis of Hybrid Matrices"

W. Ulbrich, Technical University Munich,

Munich, West Germany 115

A3.4: "Abstract Minimal Cascade Synthesis

of Lossless 1-ports: One Step towards a

Complete Theory of Canonic Cascade Synthe¬

sis of Reactances"

Dao Manh Cuong, M. Hosier, EPFL, Lausanne,

Switzerland 120

A3.5: "Realization of Homogeneous Positive

Real Functions with Denominators Composed

of Linear Factors"

H. Ozaki, S.-I. Okabe, Osaka University, Osaka,

Japan 125

A3.6: "Algebraic Characterization of a Class

of Multivariable Positive-Real Functions"

M.S. Piekarski, Wroclaw Technical University,

Wroclaw, Poland 130

O ECCTD'78 PROCEEDINGS

Session A4

ACTIVE FILTERS

Chairman: E. Lueder, University of Stuttgart, Stuttgart,West Germany

INVITEDLECTURE by L. T. Bruton,

University ofCalgary, Calgary, Canada, on

RC-Active Filters *

A4.1: "A New Two-Amplifier-Biquad for HighPo]e-Q-Realization"/. Mutschler, University of Stuttgart, Stuttgart,West Germany 135

A4.2: "Use of an OTA and an Operational

Amplifier in Active RC Filter Synthesis"T. Deliyannis, University of Patras, Patras,Greece 140

A4.3: "First Order Precorrection for Exact

Synthesis of Single Amplifier Biquads usingReal Amplifiers"T.J. Dhabhar, R.B. Datar, IF. Dhilla, Tata

Electric Companies, Bombay, India 145

A4.4: "Frequency Limitations of Active-R Fil¬

ters Using Operational Amplifiers"V. Kapustian, B.B. Bhattacharyya, M.N.S. Swamy,Concordia University, Montreal, Canada ,150

Paper not received at time of going to press

CONTENTS 9

Session A5

ACTIVE AND CCD-FILTERS

Chairman: M.S. Ghausi, Wayne State University, Detroit,Mich, USA

A5.1: "Realization of a Bandpass Filter with

Floating Frequency-Dependent Negative Con¬

ductances Using Operational Transconductance

Amplifiers"A. Knob, J.-L. Zufferey, L. T. Huynh, EPFL,Lausanne, Switzerland 155

A5.2: "Efficient Optimization Scheme for a

Class of FDNR Prototype Networks"

R.E. Massara, University ofKeele, Staffordshire,England 160

A5.3: "Feasibility Study of Active Filter

Structures for Hybrid Thick Film Implemen¬tation" 165

P. Horn, R. Leuenberger, ETHZ, Zurich, Swit¬

zerland

A5.4: "High-Q High-Frequency RC-Active Fil¬

ters Using Distributed Thin Film Elements"

H. W. Renz, University of Stuttgart, Stuttgart,West Germany 170

A5.5: "Design of CCD Recursive Filters"

S. T. Ferguson, W. Steenaart, University of

Ottawa, Ottawa, Canada 175

A5.6: "Integrated CCD-Filters employing Novel

Techniques for On-Chip Tap Weights"A.A. Ibrahim, G.J. Hupe, T.G. Foxall, Bell Nor¬

thern Research, Ottawa, Canada *

Paper not received at time ofgoing to press

10 ECCTD'78 PROCEEDINGS

Invited Session A6

INDUCTORLESS FILTERS IN COMMUNICATION

SYSTEMS I

Chairman: C.F. Kurth, Bell Telephone Laboratories, North

Andover, Mass, USA

A6.1: "Recent Trends in Filter Technologies in

Communication Systems"C.F. Kurth, Bell Telephone Laboratories, North

Andover, Mass, USA 181

A6.2: "Filters for Digital Transmission Systems:

Applications and Trends"

J.F. Pinel, Bell Northern Research,

Ottawa, Canada 183

A6.3: "Inductorless Filter Applications in Trans¬

mission Systems"K. Yakuwa, T. Kojima,M. Yanagi,K. Shirai,

Fujitsu, Kawasaki, Japan 191

A6.4: "Mechanical Filters and Their Counter¬

parts. - Hybrid and Monolithic Integrated Filters"

E. Gleissner, H. Schuessler, AEG - Telefunken,

Backnang, West Germany 198

CONTENTS

Invited Session A7

INDUCTORLESS FILTERS IN COMMUNICATION

SYSTEMS H

Chairman: C.F. Kurth, Bell Telephone Laboratories, North

Andover, Mass, USA

A7.1: "Analog Active Filters: Some Design Con¬

siderations and Technological Aspects"J.A. Nossek, Siemens AG. Munich,

West Germany

A7.2; "Active Filters for Communication"

W. Saraga, Imperial College of Science and

Technology, London, England

A7.3: "Switched-Capacitor Filters for Telecom¬

munication Applications"PR. Gray,R.W. Broderson,D.A. Hodges,

D. Allstot, G. Jacobs, University of California,

Berkeley, USA

A7.4: "Digital Filter Structures for Transmission

Systems"M. Bellanger, TRT, Le Plessis Robinson, France.

.

12 l-CCTD'78 PROCEEDINGS

Session A8

FILTER SENSITIVITY, STABILITY AND NOISE

Chairman: E. Zeheb, Israel Institute of Technology, Haifa,

Israel

A8.1: "Equivalent Active Networks with Mini¬

mal Sensitivity"F.M. El-Turky, J. Vlach, University of Waterloo,

Waterloo, Canada 246

A8.2: "Noise Parameters with Sensitivities for

High Frequency Networks Containing Transis¬

tors and Lossy Transmission Lines"

P. Stangerup, Danish Research Center for AppliedElectronics, Harsholm, Denmark 251

A8.3: "Noise and Sensitivity Performance of

Complementary and Dual Second-Order Active

Filter Building Blocks"

HJ. Baechler, W. Guggenbuehl, ETHZ, Zurich,Switzerland 256

A8.4: "On the Two-Integrator-Loop Active RC

Biquads"A. Heszberger, E. Simonyi, Research Institute

for Telecommunications, Budapest, Hungary. . .261

A8.5: "On a Large- and Small - Change Sensiti¬

vity in Biquadratic Active Filters with One Ope¬rational Amplifier"J.T. Ogrodzki,M.A. Styblinski, WarsawPoly-

technic, Warsaw, Poland 266

A8.6: "Minimizing the Coefficient Sensitivity of

Sampled Data Filters"

E. Lueder, University of Stuttgart, Stuttgart,West Germany 271

CONTENTS 13

Session Bl

TIME-VARYING AND STOCHASTIC NETWORKS

Chairman: A. Csurgay, Research Institute for Telecom¬

munications, Budapest, Hungary

Bl.l: "On the Theory of Approximation of

Positive Definite Sequences in the Time Domain"

P. Dewilde, Delft University of Technology,Delft, The Netherlands 277

B1.2: "A Numerical Calculus for ConstructingApproximating Covariance Prediction ModellingFilters in the Time Domain"

E. Deprettere, Delft University of Technology,

Delft, The Netherlands 283

B1.3: "An Algorithm for the Realization of

Time-Varying Linear Sequential Circuits from

the Given Impulse Response Matrix over GF(2)"A.K. Kamal, H. Singh, J.S. Bedi, University

of Roorkee, Roorkee, India 289

B1.4: "Determination of the State Transition

Matrix of a Class of Linear Time-VaryingSystems"A. Dervi$oglu,I.C. Goknar, Technical

University of Istanbul, Istanbul, Turkey 295

Bl .5: "On Transposition of Linear Time-

Varying Discrete-Time Networks and its

Application Multirate Digital Systems"T.A.C.M. Clausen, W.F.G. Mecklenbrduker,

Philips Research Laboratories, Eindhoven,

The Netherlands 300

14 ECCTD'78 PROCEEDINGS

Session B2

DIGITAL FILTERS I

Chairman: A. Fettweis, University of the Ruhr, Bochum,West Germany

B2.1: "An Analytic Design for FIR Filters"

J.O. Scanlan, H. Baher, University College,

Dublin, Ireland 305

B2.2: "Linear Transformation of Digital Filters"

E. Lueder, K. Haug, University of Stuttgart,

Stuttgart, West Germany 310

B2.3: "On the Use of Modified Petri Nets for

Multiprocessor Realizations of Digital Filters"

R. Nouta, 0. Simula, Delft University of Tech¬

nology, Delft, The Netherlands 315

B2.4: "Some Considerations on Recursive Digi¬tal Filter Structures with Low Sensitivity"R. Boite, Polytechnic Faculty of Mons, Mons,

Belgium 320

B2.5: "Wave Digital Filters with Frequency

Dependent Normalization Port Resistances"

E Tzanettis, A. G. Constantinides, Imperial

College of Science and Technology, London,

England 325

B2.6: "Reduction of Coefficient Word Lengthfor FIR Linear Phase Digital Filters"

F. Grenez, Free University of Brussels, Brussels,

Belgium 330

CONTENTS

Session B3

DIGITAL FILTERS II

Chairman: Y. Genin, MBLE, Brussels, Belgium

B3.1: "Design of Low Sensitivity and Complexi¬ty Digital Filter Structures"

A.M. Ali, A. G. Constantinides, Imperial Collegeof Science and Technology, London, England . . 335

B3.2: "The Suppression of Slope Overload

Cycles in Digital and Hybrid Filters Realized

with Delta Modulation"

C. Thoeny, ETHZ, Zurich, Switzerland 340

B3.3: "Circularly Symmetric 2-D Recursive

Digital Filters"

K.S. Thyagarajan, Instituto Nacional de Astro-

fisica, Optica y Electronica.Tonantzintla,Mexico 345

B3.4: "A State-Space Representation and Error

Analysis" for 2-D Discrete SystemsN.J. Theodorou ,R.A. King, Imperial College of

Science and Technology, London, England ....350

B3.5: "A Weighted /p-Design Technique for Two-

Dimensional Recursive Digital Filters"

J.H. Lodge, MM. Fahmy, Queens University,Kingston, Canada 355

B3.6: "Computer Realization of Two-Dimen¬

sional Wave Digital Filters"

P. Lennarz, L. Hofmann, University of the Ruhr,Bochum, West Germany 360

16 ECCTD'78 PROCEEDINGS

Invited Session B4

TWO-DIMENSIONAL DIGITAL FILTERING I

Chairman: S.K. Mitra, University of California, Santa Barbara,

CA, USA

B4.1: "Two-Dimensional Digital Filters

- An Overview"

S.K. Mitra, University of California, Santa Barbara,

CA, USA *

B4.2: "A Criterion for Two-Variable Positivity and

Boundedness"

Ph. Delsarte, Y. Genin, Y. Kamp, MBLE Research

Laboratory, Brussels, Belgium 365

B4.3: "Stabilization of 2-D Recursive Filters"

J.K. Aggarwal, H. Chang, University of Texas,

Austin, Texas, USA *

B4.4: "Structural Properties of State-Space Repre¬sentation for Two-Dimensional Filters"

E. Fomasini, G. Marchesini, University of Padua,

Padua, Italy 371

B4.5: "Realization of Two-Dimensional Systems"J.H. McClellan, D.S.K. Chan, MIT, Cambridge,

Mass,USA 381

*Paper not received at time of going to press

ECCTD'78 PROCEEDINGS 17

Invited Session B5

TWO-DIMENSIONAL DIGITAL FILTERING II

Chairman: S.K. Mitra, University of California, Santa Barbara,

CA, USA

B5.1: "Design and Structural Considerations for

Two-Dimensional Digital Filters"

A.G. Constantinides, Imperial College of Science

and Technology, London, England : . .

*

B5.2: "Some 2-D Digital Filters with Applica¬

tion to Image Processing"

V. Cappellini,M. Bemabb,P.L. Emiliani,,

University of Florence, Florence, Italy 389

B5.3: "A Digital Filter Approach for the Nume¬

rical Solution of Partial Differential Equations"P. Steffen, University of Erlangen-Nuernberg,

Erlangen, West Germany 396

B5.4: "Some Techniques for Digital Deconvo-

lution of Positive Constrained Multi-Dimensio¬

nal Sequences"R.M. Merserau, R.W. Schafer, Georgia Institute of

Technology, Atlanta, GA, USA 404

*Paper not received at time of going to press

18 ECCTD'78 PROCEEDINGS

Session B8

NONLINEAR CIRCUITS

Chairman: L. 0. Chua, University of California, Berkeley,

CA, USA

B8.1: "Formulation of New Equations from

Scalar Generating Functions for Nonlinear RLC

Networks with Memristors"

MM. Milic,L. Novak, University of Belgrade,Belgrade, Yugoslavia 412

B8.2: "Derivation of Second Order SensitivityCoefficients of Nonlinear Networks"

G.S, Reschka, Silesian Technical University,Gliwice, Poland 417

B8.3: "Function Elimination Filters Matched

to the N-Order Exponential Signal"E. Plotkin, University of the Negev, Beer-Sheva,Israel 422

B8.4: "Computation of Bounds on Solution To¬

lerances Resulting from Element Tolerances in

Nonlinear Resistive Network"

M.E. Zaghloul, PR. Bryant, K. Singhal, Univer¬

sity of Waterloo, Waterloo, Canada 427

B8.5: "Computational Technique for the SteadyState Analysis of Large Nonlinear Circuits with

Periodic Inputs"F.S. Fattouh, N.C. Rumin, McGill University,Montreal, Canada 432

B8.6: "Analysis of the Jump Phenomenon in

Gyrators"

M. Biatko, Z.P. Tomaszewski, Technical

University of Gdansk, Gdansk, Poland 437

CONTENTS

Session CI

MODELLING

Chairman: P.P. Civalleri, Istituto Elettrotecnico Nazionale,

Torino, Italy

Cl.l: "Unified Circuit Modelling and Analysis

for Large Systems"A.E. Ruehli, N.B. Rabbat, H. Y. Hsieh, IBM, East

Fishkill and Yorktown Heights, N.Y, USA.... 443

CI.2: "New Macromodelling Approaches for

the Simulation of Large Scale Integrated Cir¬

cuits"

M. Glesner, University of the Saarland,

Saarbrticken, West Germany 448

C1.3: "Computer-Aided MOSFET Inverter

Circuit Analysis Using NormalizedVariables"

J.A.P. Hoogervorst, J.M. Koopmans, T. Poorter,

A.F. Schwarz, Delft University of Technology,

Delft, The Netherlands 453

CI.4: "A Simplified Equivalent Network for

Macromodelling FET Operational Amplifiers"H.L. Zapf, Technical University Munich, Munich,

West Germany 458

CI.5: "Approximate Circuit Modelling of Micro-

strip Dispersion: Coupled TEM-TE Line Repre¬

sentation of Finite Microstrip Sections"

L. Bdlint, Research Institute for Telecommuni¬

cations, Budapest, Hungary 463

20 ECCTD'78 PROCEEDINGS

Session C2

COMMUNICATION CIRCUITS

Chairman: P. Leiithold, ETHZ, Zurich, Switzerland

C2.1: "A New Approach to An A-Law PCM

Encoder"

W. Winkelnkemper, H.-L. Fiedler, Universityof the Ruhr, Bochum, West Germany 468

C2.2: "Switching System Fault Location UsingOn-Line Data"

J.J. Narraway, KM. So, University of

New Brunswick, Fredericton, NB, Canada 473

C2.3: "Logic Design of Multiple-Valued Swit¬

ching Circuits Using Modulo Adders"

C. Moraga, University of Dortmund, Dort¬

mund, West Germany 478

C2.4: "A Simple Analysis Method for Linear

Systems Consisting of Time-Invariant Circuits

and Periodic Carrier Actuated Modulators"

W. Saraga, B. Nowrouzian, Imperial College of

Science and Technology, London, England ....483

C2.5: "Orthonormal Two-Port Realization"

L.S. Czarnecki, Technical University,

Gliwice, Poland 488

CONTENTS 21

Session C4

TOPOLOGY

Chairman: N. Balabanian, IAP/INELEC, Boumerdes, Algeria

C4.1: "Analysis of the Connectivity Structure

of Network Graphs"M. van der Woude, Eindhoven University of Tech¬

nology, Eindhoven, The Netherlands 493

C4.2: "An Algorithm for Calculating Path Dis¬

tances in a Weighted Graph and Its Application"/. Shirakawa, S. Ishida, S. Kageura, Kinki

Nippon Railway, Nara, and Osaka University,Osaka, Japan 498

C4.3: "On the Realization of Terminal CapacityMatrix by the Given Network"

AM. Koturovic, R.B. Vukanovic, Institute of

Nuclear Sciences, Belgrade, Yugoslavia 503

C4.4: "Investigating Solvability and Complexi¬

ty of Linear Active Networks by Means of Ma-

troides"

B. Petersen, Technical University of Denmark,

Lyngby, Denmark 508

C4.5: "A Planarization Graph Model for the

Computer Aided Topological Design of HybridCircuit Layouts"R. van der Leeden, Technical University Munich,

Munich, West Germany 513

22 ECCTD'78 PROCEEDINGS

Session C5

SPECIAL CIRCUITS

Chairman: J.O. Scanlan, University College, Dublin, Ireland

C5.1: "Structure Independent Synthesis of AnalogFilters with Digitally Tunable Parameters"

H.D. Ferling, Technical University Darmstadt,

Darmstadt, West Germany 518

C5.2: "Digitally Controlled Active Filter

Modules"

K. Engstrom, A. Hedevdrn, K. Mossberg,

Royal Institute of Technology, Stockholm,Sweden 523

C5.3: "ANewMTI Structure with Inherent

Analog to Digital Conversion"R. Fehr, Hoffmann-La Roche, Basel,Switzerland 528

C5.4: "Precise Generation of Prescribed

Waveforms"

B.Z. Kaplan, University of the Negev,Beersheva, Israel 533

C5.5: "Feedback Models of VCO Controlled

by One Variable Network Element"

J. Roszkiewicz, R. Woityna, Gdansk

Technical University, Gdansk, Poland 538

C5.6: "Effects of Second Harmonic Termin¬

ations on the performances of a Class-C UHF

Transistor Power Amplifier"H.Q. Vu, S.R. Mazumder, F.E. Gardiol,N. Volpicella, EPFL, Lausanne, Switzerland . . . 543

CONTENTS 23

Session C6

COMPUTER-AIDED DESIGN I

Chairman: R. Spence, Imperial College of Science and

Technology, London, England

C6.1: "Wave Concepts in Digital Simulation of

Continuous-Time Circuits and Systems Employ¬

ing Implicit Multistep Integration Formulae"

L. Kittel, TE KA DE, Felten and Guilleaume,

Nurnberg, West Germany 548

C6.2: "Two-Graph Tableau and Mixed Nodal

Tableau Formulation on Networks with Ideal

Elements"

K. Singhal.J. Vlach, University of Waterloo,

Waterloo, Canada 553

C6.3: "Improved Regionalization for Statisti¬

cal Network Analysis"K. Gopal, K. Singhal, J. Vlach, University of

Waterloo, Waterloo, Canada; J.F. Pinel, Bell

Northern Research, Ottawa, Ontario, Canadai. . . 558

C6.4: "Time-Domain Analysis of Piecewise-

Linear Networks"

/. Hajj, St. Skelboe, University of Waterloo,

Waterloo, Canada 563

C6.5: "Computer-Aided Analysis of Pulse

Signal Propagation in Digital Systems"

V. Dvofdk, Technical University of Brno,

Brno, Czechoslovakia 568

24 ECCTD'78 PROCEEDINGS

Session C7

COMPUTER-AIDED DESIGN II

Chairman: J.K. Skwirzynski, Marconi Company, Chelms¬

ford, England

C7.1: "An Integrated Approach to Manufactu¬

ring Yield Estimation and Design Centering"

K.S. Tahim, R. Spence, Imperial College of

Science and Technology, London, England ....573

C7.2: "Statistical Method for Tolerance Assign¬

ment in Electrical Networks"

K. Gopal, K. Singhal, J. Vlach, University of Wa¬

terloo, Waterloo, Canada 578

C7.3: "An Algorithm for Design Centering,

Tolerancing and Tuning (DCTT)"E. Polak, A. Sangiovanni-Vincentelli, University

of California, Berkeley, CA, USA 582

C7.4: "A Uniform Approach to Computer-AidedAnalysis of Large Scale Electronic Networks and

Their Subnetworks"

A.I. Petrenko, Kiev Polytechnic Institute, Kiev,

USSR 587

C7.5: "A Variance Minimization Approach to

the Choice of Component Grades in Linear

Systems"R Krishnan Iyer, T. Downs, Norwegian Institute

of Technology, Trondheim Norwayi 592

CONTENTS 25

Session C8

FILTER APPROXIMATION

Chairman: J.D. Rhodes, University of Leeds, Leeds,

England

C8.1: "Design Techniques for Digital and

Analog All-Pass Circuits"

R. Gregorian, G.C. Temes, University of Cali¬

fornia, Los Angeles, CA, USA 597

C8.2: "A Direct Approximation Technique for

Designing Digital Equalizors with Simultaneous

Specification of Magnitude and Phase"

J.B. Marifio-Acebal, A. Mayer-Pujadas,A.R. Figueiras-Vidal, E.T.S.I. Telecommunica¬

tions, Barcelona, Spain 602

C8.3: "Data Transmission Filters Having an

Equiripple Stopband"L.F. Lind, S.E. Nader, University of Essex,

Colchester, England 607

C8.4: "Lowpass Filter Maximally Flat Beyondthe Origin with the Chebyschev Stopband"V. Jovanovic, University of Belgrade, Belgrade,

Yugoslavia 612

C8.5: "Effective Loss Design of Filters with

Two Pass Bands"

J.E. Colin, SAT, Paris, France 617

AUTHOR INDEX 623