GB738319A - Improvements in or relating to negative impedance devices employing transistor amplifiers - Google Patents

Improvements in or relating to negative impedance devices employing transistor amplifiers

Info

Publication number
GB738319A
GB738319A GB6336/53A GB633653A GB738319A GB 738319 A GB738319 A GB 738319A GB 6336/53 A GB6336/53 A GB 6336/53A GB 633653 A GB633653 A GB 633653A GB 738319 A GB738319 A GB 738319A
Authority
GB
United Kingdom
Prior art keywords
line
impedance
negative impedance
relating
devices employing
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
GB6336/53A
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.)
JEAN MARIE MOULON
Original Assignee
JEAN MARIE MOULON
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 JEAN MARIE MOULON filed Critical JEAN MARIE MOULON
Publication of GB738319A publication Critical patent/GB738319A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/04—Control of transmission; Equalising
    • H04B3/16—Control of transmission; Equalising characterised by the negative-impedance network used
    • H04B3/18—Control of transmission; Equalising characterised by the negative-impedance network used wherein the network comprises semiconductor devices

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Interface Circuits In Exchanges (AREA)

Abstract

738,319. Telephone transmission systems. MOULON, J. M. March 6, 1953 [Sept. 19, 1952], No. 6336/53. Class 40 (4). [Also in Group XL (c)] The attenuation of a two-wire line 30 is reduced by the use of a negative impedance in series or in parallel with the line. The transformer-coupled amplifier employing transistors 31, 32 feeds a Wheatstone bridge of resistors 6, 7, 8 and the series impedance of the transmission line 30. By changing over the switches 27, 28 and 29 the negative impedance is altered to suit the parallel connection across the line 30. The circuit is adjusted by disconnecting the feedback circuit from the input, terminating it with an impedance equal to the input impedance of the amplifier, connecting a predetermined resistance in place of the line 30 and adjusting the bridge for balance.
GB6336/53A 1952-09-19 1953-03-06 Improvements in or relating to negative impedance devices employing transistor amplifiers Expired GB738319A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1063497T 1952-09-19

Publications (1)

Publication Number Publication Date
GB738319A true GB738319A (en) 1955-10-12

Family

ID=9601179

Family Applications (1)

Application Number Title Priority Date Filing Date
GB6336/53A Expired GB738319A (en) 1952-09-19 1953-03-06 Improvements in or relating to negative impedance devices employing transistor amplifiers

Country Status (4)

Country Link
BE (1) BE518902A (en)
CH (1) CH321706A (en)
FR (1) FR1063497A (en)
GB (1) GB738319A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3204048A (en) * 1961-09-29 1965-08-31 Bell Telephone Labor Inc Negative impedance repeaters for non-loaded lines

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL192904A (en) * 1954-03-22

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3204048A (en) * 1961-09-29 1965-08-31 Bell Telephone Labor Inc Negative impedance repeaters for non-loaded lines

Also Published As

Publication number Publication date
FR1063497A (en) 1954-05-04
CH321706A (en) 1957-05-15
BE518902A (en)

Similar Documents

Publication Publication Date Title
US4007335A (en) Telephone line battery feed circuit
US3271528A (en) Adjustable input impedance amplifier
GB738319A (en) Improvements in or relating to negative impedance devices employing transistor amplifiers
US2545476A (en) Loud-speaker telephone intercommunication system
ES362693A1 (en) Active telephone set speech network employing transistor feedback loop for sidetone balance and equalization
GB1256240A (en) Improvements in or relating to hybrid circuits
GB1325784A (en) Telephone circuits utilizing active elements
GB727765A (en) Improvements in or relating to negative impedance devices
ES340855A1 (en) Nonreactive antisidetone network for a telephone set
GB1271310A (en) Improvements in or relating to telecommunications system subscriber station circuit arrangements
ES484232A1 (en) Separation and balance device for telephone exchanges
GB781135A (en) Telephone instrument utilizing transistor amplifier
GB853672A (en) Improvements in or relating to transistor amplifiers
GB849316A (en) Improvements in or relating to transistor amplifier circuits
GB787824A (en) Improvements in or relating to circuits including electric signal transmission linesin communication systems
GB730558A (en) Improvements in or relating to output control circuits for electrical transmission networks
US3177294A (en) Device for use in telephone sets
GB1180200A (en) Improvements in or relating to Feedback Amplifier Systems
GB917194A (en) Improvements in or relating to negative feedback transistor amplifiers
GB753079A (en) Improvements in transistor amplifiers
GB1124351A (en) Improvements in or relating to electric circuits
GB708299A (en) High-stability d.c. amplifier circuit arrangement
GB747757A (en) Improvements in or relating to negative impedance devices
GB1211776A (en) An arrangement for varying the feedback of an amplifier
GB775564A (en) Improvements in or relating to telephone subscribers' instruments