GB1323918A - Bandstop filter - Google Patents
Bandstop filterInfo
- 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
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.
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)
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)
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 |
-
1970
- 1970-04-16 FR FR7014126A patent/FR2088613A5/fr not_active Expired
-
1971
- 1971-03-09 JP JP1225571A patent/JPS5316263B1/ja active Pending
- 1971-03-13 DE DE19712112200 patent/DE2112200A1/en active Pending
- 1971-04-19 GB GB2560771A patent/GB1323918A/en not_active Expired
Cited By (1)
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 |