GB841560A - Improvements relating to t filter circuits - Google Patents

Improvements relating to t filter circuits

Info

Publication number
GB841560A
GB841560A GB2692155A GB2692155A GB841560A GB 841560 A GB841560 A GB 841560A GB 2692155 A GB2692155 A GB 2692155A GB 2692155 A GB2692155 A GB 2692155A GB 841560 A GB841560 A GB 841560A
Authority
GB
United Kingdom
Prior art keywords
bridged
circuit
arm
resistor
circuits
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
GB2692155A
Inventor
Edward Charles Crawford
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.)
EMI Ltd
Electrical and Musical Industries Ltd
Original Assignee
EMI Ltd
Electrical and Musical Industries 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 EMI Ltd, Electrical and Musical Industries Ltd filed Critical EMI Ltd
Priority to GB2692155A priority Critical patent/GB841560A/en
Priority to FR1159815D priority patent/FR1159815A/en
Publication of GB841560A publication Critical patent/GB841560A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/01—Frequency selective two-port networks
    • H03H7/06—Frequency selective two-port networks including resistors
    • H03H7/07—Bridged T-filters

Landscapes

  • Filters And Equalizers (AREA)
  • Networks Using Active Elements (AREA)

Abstract

841,560. Bridged-T filter networks. ELECTRIC & MUSICAL INDUSTRIES Ltd. Sept. 7, 1956 [Sept. 21, 1955], No. 26921/55. Class 40(8). A bridged-T filter circuit has a resistance in one arm the tolerance of which exceeds the accuracy required to achieve a desired rejection characteristic, a variable reactor being connected in this arm to enable the circuit to be adjusted to obtain the desired characteristic. In known bridged-T rejector circuits (Fig. 2) a resistor R 2 is incorporated in the shunt arm to increase the Q of the circuit by compensating the losses in L, and 2C3. According to the invention, a resistor R 2 having a tolerance of e.g. 20% may be used and exact compensation achieved by adjustment of an inductor L 3 (or a capacitor) in the shunt arm. Slight readjustment of one of elements of the tuned circuit is also required. The resistor and inductor of the shunt arm may be combined in a single component. The invention may be applied to bridged-T circuits of the form shown in Fig. 3. In a modification of this circuit capacitance C 3 is fixed and the tapping on L, is variable. The invention may be applied to bridged T-circuits having series arms which are resistive.
GB2692155A 1955-09-21 1955-09-21 Improvements relating to t filter circuits Expired GB841560A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB2692155A GB841560A (en) 1955-09-21 1955-09-21 Improvements relating to t filter circuits
FR1159815D FR1159815A (en) 1955-09-21 1956-09-18 Improvements to t circuits

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2692155A GB841560A (en) 1955-09-21 1955-09-21 Improvements relating to t filter circuits

Publications (1)

Publication Number Publication Date
GB841560A true GB841560A (en) 1960-07-20

Family

ID=10251303

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2692155A Expired GB841560A (en) 1955-09-21 1955-09-21 Improvements relating to t filter circuits

Country Status (2)

Country Link
FR (1) FR1159815A (en)
GB (1) GB841560A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5121078A (en) * 1989-10-19 1992-06-09 French State Represented By The Minister Of Post, Telecommunications And Space (Centre National D'etudes Des Telecommunications) Filtering cell and corresponding filter
US5453721A (en) * 1994-06-09 1995-09-26 Motorola, Inc. Attenuator
US6867665B2 (en) * 2000-08-21 2005-03-15 Sirific Wireless Corporation Filters implemented in integrated circuits

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5121078A (en) * 1989-10-19 1992-06-09 French State Represented By The Minister Of Post, Telecommunications And Space (Centre National D'etudes Des Telecommunications) Filtering cell and corresponding filter
US5453721A (en) * 1994-06-09 1995-09-26 Motorola, Inc. Attenuator
US6867665B2 (en) * 2000-08-21 2005-03-15 Sirific Wireless Corporation Filters implemented in integrated circuits

Also Published As

Publication number Publication date
FR1159815A (en) 1958-07-02

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