US3559114A - Filter arrangement consisting of a ladder network of reactances and a terminating resistance and signal sources connected to a series element on the input side of the filter and to one or more shunt elements in said ladder network - Google Patents

Filter arrangement consisting of a ladder network of reactances and a terminating resistance and signal sources connected to a series element on the input side of the filter and to one or more shunt elements in said ladder network Download PDF

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Publication number
US3559114A
US3559114A US757058A US3559114DA US3559114A US 3559114 A US3559114 A US 3559114A US 757058 A US757058 A US 757058A US 3559114D A US3559114D A US 3559114DA US 3559114 A US3559114 A US 3559114A
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United States
Prior art keywords
ladder network
reactances
filter
filter arrangement
signal sources
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Expired - Lifetime
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US757058A
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English (en)
Inventor
Tore Torstensson Fjallbrant
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Telefonaktiebolaget LM Ericsson AB
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Telefonaktiebolaget LM Ericsson AB
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Priority claimed from SE12865/67A external-priority patent/SE302017B/xx
Application filed by Telefonaktiebolaget LM Ericsson AB filed Critical Telefonaktiebolaget LM Ericsson AB
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K21/00—Fluid-delivery valves, e.g. self-closing valves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B67—OPENING, CLOSING OR CLEANING BOTTLES, JARS OR SIMILAR CONTAINERS; LIQUID HANDLING
    • B67D—DISPENSING, DELIVERING OR TRANSFERRING LIQUIDS, NOT OTHERWISE PROVIDED FOR
    • B67D1/00—Apparatus or devices for dispensing beverages on draught
    • B67D1/08—Details
    • B67D1/0829—Keg connection means
    • B67D1/0831—Keg connection means combined with valves
    • B67D1/0832—Keg connection means combined with valves with two valves disposed concentrically
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/01—Frequency selective two-port networks
    • H03H7/0115—Frequency selective two-port networks comprising only inductors and capacitors
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/01—Frequency selective two-port networks
    • H03H7/075—Ladder networks, e.g. electric wave filters

Definitions

  • a filter comprises a ladder network of reactances connected between a signal input and a terminating resistor.
  • One type of reactance serially connects the signal input to the terminating resistor, the second type extends from the junctions of serially connected reactances.
  • a portion of the input signal is fed to the free end of at least some of the reactances of the second type.
  • the magnitudes of the reactances and the required portions of the input signal are chosen in accordance with the desired transfer characteristic.
  • These filters can in a known way consist of for example ladder networks with inductances and capacitances, which networks in one end are terminated by a resistance and in the other end are fed from a voltage generator with a very low output impedance or a current generator with a very high output impedance.
  • the number of reactances, i.e. inductances and capacitances is equal to the degree of the denominator polynomial.
  • Filters with a transfer function F with a polynomial also in the numerator can by means of conventional methods be constructed so that the ladder network is provided with certain parallel resonance circuits instead of the corresponding simple series elements or so that the ladder network besides simple inductances is provided also with mutual inductances, which are necessary when the numerator polynomial has roots in the right half of the complex frequency plane.
  • additional reactances are thus required on account of the numerator polynomial. This 'need for additional reactances and particularly for mutual inductances must be regarded as a great disadvantage, and the purpose of the present invention is to eliminate this disadvantage.
  • a filter arrangement according to the invention is of the kind characterized in accordance with the terminating claim following after the description.
  • FIG. 1 schematically shows a filter arrangement according to the invention and
  • FIG. 2 shows the attenuation of the filter arrangement and the time delay deviation as a function of the frequency.
  • the filter arrangement consists of a ladder network with series inductances L1, L2, L3 and shunt capacitances C1, C2, C3.
  • the right end of the ladder network is terminated by a resistance R and the left end is intended to be connected to an input signal source e
  • the capacitor C1 is in one end connected to the connecting point between the inductances L1 and L2 and in its other end it is connected to a signal source (1 6
  • the capacitor C2 is in one end connected to the connecting point between the inductances L2 and L3 and in its other end it is connected to a signal source 1x 6
  • the capacitor C3 is in one end connected to the connecting point between the inductance L3 and the resistance R and in its other end it is connected to ground.
  • FIG. 1 'It is intended that the filter arrangement according to FIG. 1 shall be used in a telecommunication application requiring a transfer function F which in FIG. 2 is shown in the form of a curve by the attenuation curve I and the time delay deviation II as a function of the frequency
  • the invention is of course not limited to the embodiment shown in FIG. 1 with inductances in the series branches and capacitances in the shunt branches.
  • Which kind of reactances that is required, the number of reactances, and the number of signal sources is determined completely by the transfer function that is desired to be realized.
  • the series elements will consist of series resonance circuits and the shunt elements of parallel resonance circuits.
  • the signal sources need not be separate units but they can for example consist of portions of a voltage divider supplied from or controlled by the input signal source.
  • Filter arrangement consisting of a ladder network of reactances and a terminating resistance, the type and magnitude of these reactances being determined by the transmission poles of the transfer function F of the filter arrangement determined beforehand, signal sources being connected to one or more shunt elements in said ladder network and one series element in the input side of the filter being intended to be connected to an input signal source, characterized in that the ladder network and the signal sources are dimensioned so that the admittance of the ladder network and the indicated signals of the signal sources with respect to magnitude and sign satisfy the wanted transfer function F of the filter arrangement according to the relation:
  • (3 is a portion of the transfer admittance of the ladder network, which portion is situated between the input of the filter arrangement and the shunt element p;
  • (3 is a portion of the transfer admittance of the ladder network, which portion is situated between the input of the filter arrangement and the shunt element k;
  • a is the relation with respect to magnitude and sign between on one hand a signal supplied to the shunt element k from the connected signal source and on the other hand a signal supplied from the input signal source to the series elements of the filter arrangement on the input side during operation;
  • k, p, m, n are integers which satisfy the relations:

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Filters And Equalizers (AREA)
  • Image Processing (AREA)
  • Facsimile Image Signal Circuits (AREA)
  • Networks Using Active Elements (AREA)
US757058A 1967-09-19 1968-09-03 Filter arrangement consisting of a ladder network of reactances and a terminating resistance and signal sources connected to a series element on the input side of the filter and to one or more shunt elements in said ladder network Expired - Lifetime US3559114A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE12865/67A SE302017B (enrdf_load_stackoverflow) 1967-09-19 1967-09-19
BE47439 1967-11-28
BE48056 1968-06-24

Publications (1)

Publication Number Publication Date
US3559114A true US3559114A (en) 1971-01-26

Family

ID=27158437

Family Applications (1)

Application Number Title Priority Date Filing Date
US757058A Expired - Lifetime US3559114A (en) 1967-09-19 1968-09-03 Filter arrangement consisting of a ladder network of reactances and a terminating resistance and signal sources connected to a series element on the input side of the filter and to one or more shunt elements in said ladder network

Country Status (6)

Country Link
US (1) US3559114A (enrdf_load_stackoverflow)
CH (1) CH487546A (enrdf_load_stackoverflow)
DE (1) DE1791037A1 (enrdf_load_stackoverflow)
FR (2) FR1581335A (enrdf_load_stackoverflow)
GB (1) GB1176434A (enrdf_load_stackoverflow)
NL (1) NL6813138A (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4097824A (en) * 1976-03-01 1978-06-27 Hitachi, Ltd. Variable equalizer
US20110313590A1 (en) * 2009-12-10 2011-12-22 Panasonic Corporation Distributed power supply system

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6177409A (ja) * 1984-09-21 1986-04-21 Sharp Corp ノイズフイルタ

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4097824A (en) * 1976-03-01 1978-06-27 Hitachi, Ltd. Variable equalizer
US20110313590A1 (en) * 2009-12-10 2011-12-22 Panasonic Corporation Distributed power supply system
US8751055B2 (en) * 2009-12-10 2014-06-10 Panasonic Corporation Distributed power supply system

Also Published As

Publication number Publication date
GB1176434A (en) 1970-01-01
NL6813138A (enrdf_load_stackoverflow) 1969-03-21
FR1581335A (enrdf_load_stackoverflow) 1969-09-12
DE1791037A1 (de) 1971-10-21
CH487546A (de) 1970-03-15
FR1581355A (enrdf_load_stackoverflow) 1969-09-12

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