JPS5797718A - Monolithic filter - Google Patents

Monolithic filter

Info

Publication number
JPS5797718A
JPS5797718A JP17438680A JP17438680A JPS5797718A JP S5797718 A JPS5797718 A JP S5797718A JP 17438680 A JP17438680 A JP 17438680A JP 17438680 A JP17438680 A JP 17438680A JP S5797718 A JPS5797718 A JP S5797718A
Authority
JP
Japan
Prior art keywords
capacity
earth
electrode
input
attenuation pole
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
JP17438680A
Other languages
Japanese (ja)
Inventor
Tsutomu Nishikawa
Atsushi Tani
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP17438680A priority Critical patent/JPS5797718A/en
Publication of JPS5797718A publication Critical patent/JPS5797718A/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 piezo-electric or electrostrictive material
    • H03H9/56—Monolithic crystal filters
    • H03H9/566—Electric coupling means therefor

Abstract

PURPOSE:To adjust the attenuation pole to a required frequency, by connecting a capacity between the electrode of earth and the earth terminal in the monolithic filter which is constituted as a band pass filter by acoustic coupling between electrodes. CONSTITUTION:A capacity 50 is connected between an electrode 30 for earth and an earth terminal. Meanwhile, in the conventional method where a capacity Cx is connected between input and output terminals 1 and 2 to adjust the attenuation pole, the capacity value must be very small, and the realization is difficult. If the capacity Cx between input and output terminal is sufficiently smaller than input and output capacities Cd of the monolithic filter, the circuit is approximately equivalent to a circuit where a capacity Cr is connected between the electrode 30 for earth and the earth terminal, and capacities Cx and Cr satisfy equation Cr Cd<2>/Cx. For example, in case of Cd=3PF and Cx= 0.1PF, Cr=90PF is true, and the realization is possible if a practical capacity is connected, and the adjustment of the attenuation pole is very easy.
JP17438680A 1980-12-10 1980-12-10 Monolithic filter Pending JPS5797718A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP17438680A JPS5797718A (en) 1980-12-10 1980-12-10 Monolithic filter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17438680A JPS5797718A (en) 1980-12-10 1980-12-10 Monolithic filter

Publications (1)

Publication Number Publication Date
JPS5797718A true JPS5797718A (en) 1982-06-17

Family

ID=15977699

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17438680A Pending JPS5797718A (en) 1980-12-10 1980-12-10 Monolithic filter

Country Status (1)

Country Link
JP (1) JPS5797718A (en)

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