JPS5575332A - Piezoelectric filter - Google Patents

Piezoelectric filter

Info

Publication number
JPS5575332A
JPS5575332A JP14774978A JP14774978A JPS5575332A JP S5575332 A JPS5575332 A JP S5575332A JP 14774978 A JP14774978 A JP 14774978A JP 14774978 A JP14774978 A JP 14774978A JP S5575332 A JPS5575332 A JP S5575332A
Authority
JP
Japan
Prior art keywords
capacity
filter
piezoelectric
input
output
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
JP14774978A
Other languages
Japanese (ja)
Inventor
Junichi Shioda
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
Original Assignee
NEC 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 Electric Co Ltd filed Critical NEC Corp
Priority to JP14774978A priority Critical patent/JPS5575332A/en
Publication of JPS5575332A publication Critical patent/JPS5575332A/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
    • H03H9/46—Filters
    • H03H9/54—Filters comprising resonators of piezoelectric or electrostrictive material
    • H03H9/58—Multiple crystal filters
    • H03H9/60—Electric coupling means therefor

Landscapes

  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)

Abstract

PURPOSE:To secure the phase difference of about pi/2 between the input and the output of the filter without installing any phase shifter by using the coupling capacity and the piezoelectric oscillator featuring a small capacity ratio. CONSTITUTION:The discrete-type piezoelectric filter is formed with use of coupling capacity K plus several units of piezoelectric oscillators featuring a small value of capacity ratio r=C0/C between equivalent capacity C and capacity C0 under resonating. Thus the phase difference of about pi/2 is secured between the input and the output of the filter.
JP14774978A 1978-12-01 1978-12-01 Piezoelectric filter Pending JPS5575332A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14774978A JPS5575332A (en) 1978-12-01 1978-12-01 Piezoelectric filter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14774978A JPS5575332A (en) 1978-12-01 1978-12-01 Piezoelectric filter

Publications (1)

Publication Number Publication Date
JPS5575332A true JPS5575332A (en) 1980-06-06

Family

ID=15437266

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14774978A Pending JPS5575332A (en) 1978-12-01 1978-12-01 Piezoelectric filter

Country Status (1)

Country Link
JP (1) JPS5575332A (en)

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