GB1323918A - Bandstop filter - Google Patents

Bandstop filter

Info

Publication number
GB1323918A
GB1323918A GB2560771A GB2560771A GB1323918A GB 1323918 A GB1323918 A GB 1323918A GB 2560771 A GB2560771 A GB 2560771A GB 2560771 A GB2560771 A GB 2560771A GB 1323918 A GB1323918 A GB 1323918A
Authority
GB
United Kingdom
Prior art keywords
current
april
coupled
input signal
resistor
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
GB2560771A
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.)
International Business Machines Corp
Original Assignee
International Business Machines 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 International Business Machines Corp filed Critical International Business Machines Corp
Publication of GB1323918A publication Critical patent/GB1323918A/en
Expired 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
    • H03H19/002—N-path filters
    • 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
    • H03H11/1213—Frequency selective two-port networks using amplifiers with feedback using transistor amplifiers

Landscapes

  • Networks Using Active Elements (AREA)

Abstract

1323918 Active filters INTERNATIONAL BUSINESS MACHINES CORP 19 April 1971 [16 April 1970] 25604/71 Heading H3U A bandstop filter comprises a current node E<SP>1</SP> to which are connected: a series connected resistor R1 and commutated network BPF arranged to block current I in a frequency band centred on the commutating frequency; and a current generator GEN controlled by the filter input signal E. The commutating signal may be derived from the input signal as described in Specification 1,323,917. The resistor and device may be connected in the feedback circuit of an amplifier OA, T1 the output from which is coupled to a pair of output transistors in unit GEN. A current bias circuit CT is also coupled across the feedback path.
GB2560771A 1970-04-16 1971-04-19 Bandstop filter Expired GB1323918A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7014126A FR2088613A5 (en) 1970-04-16 1970-04-16

Publications (1)

Publication Number Publication Date
GB1323918A true GB1323918A (en) 1973-07-18

Family

ID=9054208

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2560771A Expired GB1323918A (en) 1970-04-16 1971-04-19 Bandstop filter

Country Status (4)

Country Link
JP (1) JPS5316263B1 (en)
DE (1) DE2112200A1 (en)
FR (1) FR2088613A5 (en)
GB (1) GB1323918A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4510585A (en) * 1980-10-22 1985-04-09 Geosource Inc. Electronic filter

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4510454A (en) * 1983-11-14 1985-04-09 John Fluke Mfg. Co., Inc. Apparatus for digitally controlled calibration of frequency response of amplifiers

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4510585A (en) * 1980-10-22 1985-04-09 Geosource Inc. Electronic filter

Also Published As

Publication number Publication date
DE2112200A1 (en) 1971-11-04
FR2088613A5 (en) 1972-01-07
JPS5316263B1 (en) 1978-05-31

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee