JPS56110336A - Elastic surface wave device - Google Patents

Elastic surface wave device

Info

Publication number
JPS56110336A
JPS56110336A JP1251280A JP1251280A JPS56110336A JP S56110336 A JPS56110336 A JP S56110336A JP 1251280 A JP1251280 A JP 1251280A JP 1251280 A JP1251280 A JP 1251280A JP S56110336 A JPS56110336 A JP S56110336A
Authority
JP
Japan
Prior art keywords
electrode
surface wave
pair
pulse train
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
JP1251280A
Other languages
Japanese (ja)
Inventor
Seiji Kishimoto
Masaharu Ishigaki
Takeshi Hazama
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP1251280A priority Critical patent/JPS56110336A/en
Publication of JPS56110336A publication Critical patent/JPS56110336A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M1/00—Analogue/digital conversion; Digital/analogue conversion
    • H03M1/66—Digital/analogue converters
    • H03M1/74—Simultaneous conversion
    • H03M1/80—Simultaneous conversion using weighted impedances

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Analogue/Digital Conversion (AREA)
  • Surface Acoustic Wave Elements And Circuit Networks Thereof (AREA)

Abstract

PURPOSE:To realize a direct D/A conversion without changing the pulse train into a parallel form once in case a D/A conversion is given to the serial pulse train, by making use of the characteristics of an elastic surface wave device itself. CONSTITUTION:The weighted electrode 2 and the normal electrode 3 are formed on the same transmission line of the piezoelectric substrate. The electrode 2 has a logarithm of MXN pair (M>=1, N>=2) with an equal pitch secured among the electrode fingers plus an equal crossing width of the electrode fingers of the adjacent M pairs. At the same time, the crossing width changes successively in the ratio of 2<i> or 2<-i> (i=0, 1...N-1) and with every M pair in the direction of propagation of the elastic surface wave. The electrode 3 has a logarithm of M pair. Thus an output converted into an analog value can be obtained from the electrode 2 by supplying the pulse train corresponding to each bit of the digital signal from the electrode 3.
JP1251280A 1980-02-06 1980-02-06 Elastic surface wave device Pending JPS56110336A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1251280A JPS56110336A (en) 1980-02-06 1980-02-06 Elastic surface wave device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1251280A JPS56110336A (en) 1980-02-06 1980-02-06 Elastic surface wave device

Publications (1)

Publication Number Publication Date
JPS56110336A true JPS56110336A (en) 1981-09-01

Family

ID=11807393

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1251280A Pending JPS56110336A (en) 1980-02-06 1980-02-06 Elastic surface wave device

Country Status (1)

Country Link
JP (1) JPS56110336A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012084953A (en) * 2010-10-07 2012-04-26 Panasonic Corp Acoustic wave element, and branching filter

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012084953A (en) * 2010-10-07 2012-04-26 Panasonic Corp Acoustic wave element, and branching filter

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