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GB1338489A - Band pass filters - Google Patents

Band pass filters

Info

Publication number
GB1338489A
GB1338489A GB1654771A GB1654771A GB1338489A GB 1338489 A GB1338489 A GB 1338489A GB 1654771 A GB1654771 A GB 1654771A GB 1654771 A GB1654771 A GB 1654771A GB 1338489 A GB1338489 A GB 1338489A
Authority
GB
United Kingdom
Prior art keywords
band pass
pass filters
switches
variable impedance
active
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.)
Expired
Application number
GB1654771A
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.)
VADIC CORP
Original Assignee
VADIC CORP
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 VADIC CORP filed Critical VADIC CORP
Publication of GB1338489A publication Critical patent/GB1338489A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H11/00—Networks using active elements
    • H03H11/02—Multiple-port networks
    • H03H11/04—Frequency selective two-port networks
    • H03H11/12—Frequency selective two-port networks using amplifiers with feedback
    • H03H11/126—Frequency selective two-port networks using amplifiers with feedback using a single operational amplifier

Landscapes

  • Networks Using Active Elements (AREA)

Abstract

1338489 Bandpass amplifiers and active filters VADIC CORP 24 May 1971 [24 Aug 1970] 16547/71 Headings H3T and H3U In an active bandpass filter comprising a feedback network which includes a reactance 13, the resonant frequency is varied without changing the gain or bandwidth by a variable impedance coupled to the feedback path. The variable impedance may be a number of switched resistors 22, 23, 24 selectively switched into the circuit by switches 26, 27, 28. The switches may be transistors (e.g. 32, Fig. 2, not shown).
GB1654771A 1970-08-24 1971-05-24 Band pass filters Expired GB1338489A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US6627170A 1970-08-24 1970-08-24

Publications (1)

Publication Number Publication Date
GB1338489A true GB1338489A (en) 1973-11-21

Family

ID=22068425

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1654771A Expired GB1338489A (en) 1970-08-24 1971-05-24 Band pass filters

Country Status (3)

Country Link
CA (1) CA919263A (en)
DE (1) DE2141748A1 (en)
GB (1) GB1338489A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2198303A (en) * 1986-12-05 1988-06-08 Philips Electronic Associated Amplifier circuit arrangement

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2198303A (en) * 1986-12-05 1988-06-08 Philips Electronic Associated Amplifier circuit arrangement

Also Published As

Publication number Publication date
DE2141748A1 (en) 1972-03-02
CA919263A (en) 1973-01-16

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Legal Events

Date Code Title Description
PS Patent sealed
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee