JPS57203315A - Filter coefficient applying system to characteristic variable switched capacitor filter - Google Patents

Filter coefficient applying system to characteristic variable switched capacitor filter

Info

Publication number
JPS57203315A
JPS57203315A JP8916081A JP8916081A JPS57203315A JP S57203315 A JPS57203315 A JP S57203315A JP 8916081 A JP8916081 A JP 8916081A JP 8916081 A JP8916081 A JP 8916081A JP S57203315 A JPS57203315 A JP S57203315A
Authority
JP
Japan
Prior art keywords
filter coefficient
filter
switched capacitor
characteristic variable
variable switched
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
JP8916081A
Other languages
Japanese (ja)
Inventor
Seiji Kato
Norio Ueno
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 JP8916081A priority Critical patent/JPS57203315A/en
Publication of JPS57203315A publication Critical patent/JPS57203315A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H19/00—Networks using time-varying elements, e.g. N-path filters
    • H03H19/004—Switched capacitor networks

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Filters That Use Time-Delay Elements (AREA)

Abstract

PURPOSE:To reduce the capacity of a buffer register, by reading the filter coefficient in plural times into the buffer register within a single unit operation time and then applying the filter coefficient to a characteristic variable switched capacitor filter. CONSTITUTION:The data on the filter coefficient which is stored in an ROM3 is read out in accordance with the address given from a clock generating circuit 2. This data is read temporarily and in plural times into the buffer registers 5-1 and 5-2 of 8 bits as well as 5-3 and 5-4 of 8 bits respectively within a single unit operation time which is decided by the sampling frequency. Then the filter coefficient is read out by the clock pulse given from the circuit 2 and applied to the characteristic variable switched capacitor filters 1 and 1'. In such way, the capacity of the buffer register can be reduced.
JP8916081A 1981-06-10 1981-06-10 Filter coefficient applying system to characteristic variable switched capacitor filter Pending JPS57203315A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8916081A JPS57203315A (en) 1981-06-10 1981-06-10 Filter coefficient applying system to characteristic variable switched capacitor filter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8916081A JPS57203315A (en) 1981-06-10 1981-06-10 Filter coefficient applying system to characteristic variable switched capacitor filter

Publications (1)

Publication Number Publication Date
JPS57203315A true JPS57203315A (en) 1982-12-13

Family

ID=13963075

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8916081A Pending JPS57203315A (en) 1981-06-10 1981-06-10 Filter coefficient applying system to characteristic variable switched capacitor filter

Country Status (1)

Country Link
JP (1) JPS57203315A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63242016A (en) * 1987-03-30 1988-10-07 Hitachi Ltd Programmable semiconductor integrated circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63242016A (en) * 1987-03-30 1988-10-07 Hitachi Ltd Programmable semiconductor integrated circuit

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