JPS54123857A - Filter circuit - Google Patents

Filter circuit

Info

Publication number
JPS54123857A
JPS54123857A JP3134478A JP3134478A JPS54123857A JP S54123857 A JPS54123857 A JP S54123857A JP 3134478 A JP3134478 A JP 3134478A JP 3134478 A JP3134478 A JP 3134478A JP S54123857 A JPS54123857 A JP S54123857A
Authority
JP
Japan
Prior art keywords
filter
value
normalized
inductance
lattice type
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP3134478A
Other languages
Japanese (ja)
Inventor
Shigeki Suyama
Yoshiki Higo
Kazuo Nagafune
Tetsuya Miki
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
Nippon Telegraph and Telephone Corp
Original Assignee
NEC Corp
Nippon Telegraph and Telephone Corp
Nippon Electric Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NEC Corp, Nippon Telegraph and Telephone Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP3134478A priority Critical patent/JPS54123857A/en
Publication of JPS54123857A publication Critical patent/JPS54123857A/en
Pending legal-status Critical Current

Links

Classifications

    • 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

Landscapes

  • Filters And Equalizers (AREA)

Abstract

PURPOSE:To perform approximation to the equalizing characteristics required even for narrow band delivery line easily, by providing independently the value of the center inductance at the lattice type LC circuit consisting of three inductance series elements and two capacitor parallel circuits. CONSTITUTION:The lattice type LC filter a shows the fundamental constitution of the fifth Thomson filter. Taking the filter impedance as Ro and the filter band width as fo, the value of the inductance elements 1 to 3 is normalized in Ro/fo and the value of the capacitors 4, 5 is normalized in 1/(RoXfo), then the flat delay characteristics can be satisfied. By setting only the normalized value of the inductance 2 to the value different from the normalized value for the Thomson filter, the filter characteristics is made agreed to the required characteristics. When the value of the element 3 is set to the specified value different from the normalized value, as shown in curve E, it is approximated to the desired characteristics with high accuracy. In this filter, even if the values of the element 7 of the lattice type CL filter b consisting of capacitors 6 to 8 and of inductances 9 and 10 are independently set, approximate characteristics to the desired characteristics can be obtained.
JP3134478A 1978-03-17 1978-03-17 Filter circuit Pending JPS54123857A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3134478A JPS54123857A (en) 1978-03-17 1978-03-17 Filter circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3134478A JPS54123857A (en) 1978-03-17 1978-03-17 Filter circuit

Publications (1)

Publication Number Publication Date
JPS54123857A true JPS54123857A (en) 1979-09-26

Family

ID=12328604

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3134478A Pending JPS54123857A (en) 1978-03-17 1978-03-17 Filter circuit

Country Status (1)

Country Link
JP (1) JPS54123857A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04236129A (en) * 1991-01-16 1992-08-25 Fuji Electric Co Ltd Higher harmonic preventing/suppressing device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04236129A (en) * 1991-01-16 1992-08-25 Fuji Electric Co Ltd Higher harmonic preventing/suppressing device

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