JPS5744318A - Band-limiting circuit - Google Patents

Band-limiting circuit

Info

Publication number
JPS5744318A
JPS5744318A JP11930380A JP11930380A JPS5744318A JP S5744318 A JPS5744318 A JP S5744318A JP 11930380 A JP11930380 A JP 11930380A JP 11930380 A JP11930380 A JP 11930380A JP S5744318 A JPS5744318 A JP S5744318A
Authority
JP
Japan
Prior art keywords
filter
frequency mixer
frequency
filters
monolithic
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.)
Granted
Application number
JP11930380A
Other languages
Japanese (ja)
Other versions
JPS6046566B2 (en
Inventor
Yukio Fukumura
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 JP11930380A priority Critical patent/JPS6046566B2/en
Publication of JPS5744318A publication Critical patent/JPS5744318A/en
Publication of JPS6046566B2 publication Critical patent/JPS6046566B2/en
Expired 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
    • 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
    • H03H9/545—Filters comprising resonators of piezoelectric or electrostrictive material including active elements
    • 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
    • H03H9/56—Monolithic crystal filters
    • H03H9/566—Electric coupling means therefor

Landscapes

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

Abstract

PURPOSE:To improve spurious characteristics by inserting a frequency mixer between the 1st and 2nd monolithic filters and by equalizing a local oscillation frequency applied to the frequency mixer to the sum of the passing frequencies of those filters. CONSTITUTION:A signal supplied between input terminals 5 and 6 is supplied to a frequency mixer 13 through a bipolar monolithic filter 11 formed on a piezoelectric substrate 1. To the frequency mixer 13, a signal of a frequency fL is applied from a local oscillator 14. The output signal of the frequency mixer 13 apears between output terminals 7 and 8 through a multipolar monolithic filter 15. Here, when the passing frequencies of the filters 11 and 15 are f1 and f2 are fL=f1+f2, spurious characteristics appearing at the filter 11 move to a part lower than a passing frequency range when applied to the filter 15, and never overlap with those of the filter 15, thereby improving the characteristics.
JP11930380A 1980-08-29 1980-08-29 Bandwidth limiting circuit Expired JPS6046566B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11930380A JPS6046566B2 (en) 1980-08-29 1980-08-29 Bandwidth limiting circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11930380A JPS6046566B2 (en) 1980-08-29 1980-08-29 Bandwidth limiting circuit

Publications (2)

Publication Number Publication Date
JPS5744318A true JPS5744318A (en) 1982-03-12
JPS6046566B2 JPS6046566B2 (en) 1985-10-16

Family

ID=14758075

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11930380A Expired JPS6046566B2 (en) 1980-08-29 1980-08-29 Bandwidth limiting circuit

Country Status (1)

Country Link
JP (1) JPS6046566B2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6449972U (en) * 1987-09-21 1989-03-28

Also Published As

Publication number Publication date
JPS6046566B2 (en) 1985-10-16

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