GB562396A - Improvements in and relating to electron discharge amplifiers - Google Patents

Improvements in and relating to electron discharge amplifiers

Info

Publication number
GB562396A
GB562396A GB18389/42A GB1838942A GB562396A GB 562396 A GB562396 A GB 562396A GB 18389/42 A GB18389/42 A GB 18389/42A GB 1838942 A GB1838942 A GB 1838942A GB 562396 A GB562396 A GB 562396A
Authority
GB
United Kingdom
Prior art keywords
resistance
anode
grid
valve
input
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
GB18389/42A
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.)
British Thomson Houston Co Ltd
Original Assignee
British Thomson Houston Co 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 British Thomson Houston Co Ltd filed Critical British Thomson Houston Co Ltd
Publication of GB562396A publication Critical patent/GB562396A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/34—Negative-feedback-circuit arrangements with or without positive feedback
    • H03F1/36—Negative-feedback-circuit arrangements with or without positive feedback in discharge-tube amplifiers

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)
  • Transmitters (AREA)

Abstract

562,396. Telephone transmission systems. BRITISH THOMSON-HOUSTON CO., Ltd. Dec. 28, 1942, No. 18389. Convention date, Dec. 31, 1941. [Class 40 (iv)] [Also in Group XL] In a negative feedback amplifier the output impedance is maintained unaffected by the feedback by arranging a resistance common to the anode and grid circuits, with a second resistance in the grid circuit only, and a third resistance connected between the grid and anode, so proportioned that the first resistance is substantially equal to the ratio of the product of the second resistance and the internal resistance between the anode and cathode to the third resistance. Fig. 2 shows an amplifier 26 with a resistance 40 common to the input and output circuits and an input resistance 43 and a feedback resistance 45, the resistance 40 having a value equal to the ratio of the product of the effective input resistance 43 and the internal valve resistance to the resistance 45. A mathematical analysis of the circuit is given in the Specification, and an equation is' given for determining the resistance, taking into account the valve impedance and the amplification factor of the valve. Fig. 1 shows the application of the invention to microphone amplifiers 5-8 feeding the modulation apparatus 20 of a broadcast transmitter so that the attenuators 9-12 and 19 are rendered independent of one another. Resistances 13-17 provide appropriate impedance matching networks.
GB18389/42A 1941-12-31 1942-12-28 Improvements in and relating to electron discharge amplifiers Expired GB562396A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US425111A US2365575A (en) 1941-12-31 1941-12-31 Electron discharge amplifier

Publications (1)

Publication Number Publication Date
GB562396A true GB562396A (en) 1944-06-29

Family

ID=23685204

Family Applications (1)

Application Number Title Priority Date Filing Date
GB18389/42A Expired GB562396A (en) 1941-12-31 1942-12-28 Improvements in and relating to electron discharge amplifiers

Country Status (3)

Country Link
US (1) US2365575A (en)
FR (1) FR934457A (en)
GB (1) GB562396A (en)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2429775A (en) * 1944-06-22 1947-10-28 Rca Corp Amplifier system
US2480511A (en) * 1944-09-29 1949-08-30 Rca Corp Scanning circuit
US2552136A (en) * 1945-06-13 1951-05-08 Gen Electric Linear amplifier system
US2471449A (en) * 1945-12-08 1949-05-31 Standard Telephones Cables Ltd Mixer circuit using cathode follower feed-in stages
US2459046A (en) * 1946-01-30 1949-01-11 Bell Telephone Labor Inc Negative feedback amplifier
US2564554A (en) * 1947-10-09 1951-08-14 Rca Corp Background control and synchronizing signal separating circuit
US2566508A (en) * 1947-12-02 1951-09-04 Hewlett Packard Co Amplifier network
US2529459A (en) * 1948-11-02 1950-11-07 Gen Precision Lab Inc Low-frequency power amplifier
BE505025A (en) * 1950-08-02
US8688058B2 (en) * 2008-11-24 2014-04-01 Chiewcharn Narathong Techniques for improving transmitter performance

Also Published As

Publication number Publication date
FR934457A (en) 1948-05-24
US2365575A (en) 1944-12-19

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