JPS5627525A - Input circuit of elastic surface wave filter - Google Patents

Input circuit of elastic surface wave filter

Info

Publication number
JPS5627525A
JPS5627525A JP10324479A JP10324479A JPS5627525A JP S5627525 A JPS5627525 A JP S5627525A JP 10324479 A JP10324479 A JP 10324479A JP 10324479 A JP10324479 A JP 10324479A JP S5627525 A JPS5627525 A JP S5627525A
Authority
JP
Japan
Prior art keywords
impedance
reactance
surface wave
wave filter
elastic surface
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
JP10324479A
Other languages
Japanese (ja)
Inventor
Masayuki Motomiya
Hiromi Kawakami
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.)
Sony Corp
Original Assignee
Sony Corp
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 Sony Corp filed Critical Sony Corp
Priority to JP10324479A priority Critical patent/JPS5627525A/en
Publication of JPS5627525A publication Critical patent/JPS5627525A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
    • H03H9/02—Details
    • H03H9/125—Driving means, e.g. electrodes, coils
    • H03H9/145—Driving means, e.g. electrodes, coils for networks using surface acoustic waves
    • H03H9/14597—Matching SAW transducers to external electrical circuits

Landscapes

  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Surface Acoustic Wave Elements And Circuit Networks Thereof (AREA)

Abstract

PURPOSE:To eliminate the need for an inserted resistor, and to improve NF and various characteristics by providing the 1st reactance element that converts the input impedance of an elastic surface wave filter and the 2nd reactance element that resonates in parallel to the 1st one. CONSTITUTION:To the input side of elastic surface wave filter 3, the 1st reactance element 6 of X1 in reactance is connected and impedance conversion is carried out without permitting input impedance elements (Ri, Ci) of filter 3 to resonate, obtaining X'i and R'i. To the input side of element 6, on the other hand, element 7 of X2 in reactance is connected and this element 7 permits impedance elements X'i and R'i to resonate, realizing low impedance. Consequently, converted impedance of filter 3 and that of element 7 are made to resonate, so that matching with the input impedance viewed from the tuner circuit can be attained.
JP10324479A 1979-08-14 1979-08-14 Input circuit of elastic surface wave filter Pending JPS5627525A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10324479A JPS5627525A (en) 1979-08-14 1979-08-14 Input circuit of elastic surface wave filter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10324479A JPS5627525A (en) 1979-08-14 1979-08-14 Input circuit of elastic surface wave filter

Publications (1)

Publication Number Publication Date
JPS5627525A true JPS5627525A (en) 1981-03-17

Family

ID=14349020

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10324479A Pending JPS5627525A (en) 1979-08-14 1979-08-14 Input circuit of elastic surface wave filter

Country Status (1)

Country Link
JP (1) JPS5627525A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58158547U (en) * 1982-04-17 1983-10-22 株式会社東芝 Bandwidth filter output circuit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58158547U (en) * 1982-04-17 1983-10-22 株式会社東芝 Bandwidth filter output circuit
JPS645399Y2 (en) * 1982-04-17 1989-02-10

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