JPS577615A - Elastic surface wave filter circuit - Google Patents

Elastic surface wave filter circuit

Info

Publication number
JPS577615A
JPS577615A JP8086580A JP8086580A JPS577615A JP S577615 A JPS577615 A JP S577615A JP 8086580 A JP8086580 A JP 8086580A JP 8086580 A JP8086580 A JP 8086580A JP S577615 A JPS577615 A JP S577615A
Authority
JP
Japan
Prior art keywords
filter
value
surface wave
elastic surface
inductance
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
JP8086580A
Other languages
Japanese (ja)
Inventor
Kiyobumi Yamashita
Riichi Kodama
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP8086580A priority Critical patent/JPS577615A/en
Priority to US06/274,426 priority patent/US4438417A/en
Publication of JPS577615A publication Critical patent/JPS577615A/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
    • H03H9/64—Filters using surface acoustic waves
    • H03H9/6489—Compensation of undesirable effects

Landscapes

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

Abstract

PURPOSE:To obtain flat amplitude characteristics by lowering the Q value of a resonating circuit by connecting a variable resistance to inductance which compensating the internal capacitance of an elastic surface wave filter used in a VSB amplifier for TV broadcasting equipment. CONSTITUTION:The input terminal 7 and output terminal 8 of an elastic surface wave (SAW) filter 6 are connected to a preamplifiter 9 and a buffer amplifier 10 composed of an OP-AMP. To the output terminal 8 of the filter 6, an inductance element 11 and a variable resistor 12 are connected in parallel, and the inductance of the element 11 is so set that resonance occurs within the passing band of the filter, thus reducing the transmission loss of the filter 6 due to internal capacitance. The resistor 12 adjusts the Q value of a resonance circuit consisting of the internal capacitance and element 11. The Q value is adjusted to a prescribed value to obtain a filter which has steep rising and breaking characteristics and flat frequency characteristics within the passing band as shown by a solid line B.
JP8086580A 1980-06-17 1980-06-17 Elastic surface wave filter circuit Pending JPS577615A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP8086580A JPS577615A (en) 1980-06-17 1980-06-17 Elastic surface wave filter circuit
US06/274,426 US4438417A (en) 1980-06-17 1981-06-17 Filter circuit utilizing a surface acoustic wave filter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8086580A JPS577615A (en) 1980-06-17 1980-06-17 Elastic surface wave filter circuit

Publications (1)

Publication Number Publication Date
JPS577615A true JPS577615A (en) 1982-01-14

Family

ID=13730229

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8086580A Pending JPS577615A (en) 1980-06-17 1980-06-17 Elastic surface wave filter circuit

Country Status (1)

Country Link
JP (1) JPS577615A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61283209A (en) * 1985-06-10 1986-12-13 Matsushita Electric Ind Co Ltd Adjusting circuit for intermediate frequency band width
JP2002232265A (en) * 2000-06-30 2002-08-16 Kyocera Corp Surface acoustic wave filter
US6992540B2 (en) 2003-06-24 2006-01-31 Murata Manufacturing Co., Ltd. Two-port isolator and communication device
WO2006032038A1 (en) * 2004-09-15 2006-03-23 Qualcomm Incorporated Tunable surface acoustic wave resonators

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61283209A (en) * 1985-06-10 1986-12-13 Matsushita Electric Ind Co Ltd Adjusting circuit for intermediate frequency band width
JP2002232265A (en) * 2000-06-30 2002-08-16 Kyocera Corp Surface acoustic wave filter
US6992540B2 (en) 2003-06-24 2006-01-31 Murata Manufacturing Co., Ltd. Two-port isolator and communication device
WO2006032038A1 (en) * 2004-09-15 2006-03-23 Qualcomm Incorporated Tunable surface acoustic wave resonators
US7522016B2 (en) 2004-09-15 2009-04-21 Qualcomm, Incorporated Tunable surface acoustic wave resonators

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