GB562392A - Improvements in or relating to negative feedback amplifiers - Google Patents
Improvements in or relating to negative feedback amplifiersInfo
- Publication number
- GB562392A GB562392A GB18319/42A GB1831942A GB562392A GB 562392 A GB562392 A GB 562392A GB 18319/42 A GB18319/42 A GB 18319/42A GB 1831942 A GB1831942 A GB 1831942A GB 562392 A GB562392 A GB 562392A
- Authority
- GB
- United Kingdom
- Prior art keywords
- amplifier
- transformer
- networks
- inductance
- coaxial cable
- 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
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J1/00—Frequency-division multiplex systems
- H04J1/02—Details
- H04J1/16—Monitoring arrangements
-
- 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
-
- 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
- H03F1/52—Circuit arrangements for protecting such amplifiers
- H03F1/54—Circuit arrangements for protecting such amplifiers with tubes only
-
- 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
- H03F1/52—Circuit arrangements for protecting such amplifiers
- H03F1/54—Circuit arrangements for protecting such amplifiers with tubes only
- H03F1/542—Replacing by standby devices
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/74—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission for increasing reliability, e.g. using redundant or spare channels or apparatus
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Amplifiers (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Abstract
562,392. Valve amplifying circuits. STANDARD TELEPHONES & CABLES, Ltd., ROCHE, A. H., and ELLIOTT, T. W. Dec. 24, 1942, No. 18319. [Class 40 (v)] Instability during switching operations, as when a reserve negative feed-back amplifier is connected in parallel at a relay point' in a coaxial cable multi-channel carrier current signalling system, is avoided by the provision of means to ensure that the frequency of series resonance of the input and/or output transformer of one amplifier differs from that of the other amplifier. This may be achieved by connecting the second amplifier A2 through impedance networks N1, N2 so as to modify the impedance presented to the transformer of the amplifier A1. The networks will generally comprise reactive impedances and in a balanced system may be constituted by a series inductance in the conductor corresponding to the central conductor of the coaxial cable. In this way the effective leakage inductance of the corresponding transformer is increased. The networks may operate at frequencies outside the signal range and only a single network comprising only a single inductance may be used. The Specification gives an analysis of the effect of a parallel transformer and curves of the gain andphase-shift with frequency obtained.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB268701X | 1942-12-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB562392A true GB562392A (en) | 1944-06-29 |
Family
ID=10250498
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB18319/42A Expired GB562392A (en) | 1942-12-24 | 1942-12-24 | Improvements in or relating to negative feedback amplifiers |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US2364389A (en) |
| BE (1) | BE467630A (en) |
| CH (1) | CH268701A (en) |
| FR (1) | FR939157A (en) |
| GB (1) | GB562392A (en) |
| NL (1) | NL74579C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2429613A (en) * | 1943-10-19 | 1947-10-28 | Standard Telephones Cables Ltd | Pulse multiplex communication system |
| US2429775A (en) * | 1944-06-22 | 1947-10-28 | Rca Corp | Amplifier system |
-
0
- NL NL74579D patent/NL74579C/xx active
- BE BE467630D patent/BE467630A/xx unknown
-
1942
- 1942-12-24 GB GB18319/42A patent/GB562392A/en not_active Expired
-
1943
- 1943-11-29 US US512174A patent/US2364389A/en not_active Expired - Lifetime
-
1946
- 1946-04-26 FR FR939157D patent/FR939157A/en not_active Expired
- 1946-08-22 CH CH268701D patent/CH268701A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| BE467630A (en) | |
| NL74579C (en) | |
| FR939157A (en) | 1948-11-05 |
| US2364389A (en) | 1944-12-05 |
| CH268701A (en) | 1950-05-31 |
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