GB581419A - Selective amplifiers employing electron discharge tubes - Google Patents
Selective amplifiers employing electron discharge tubesInfo
- Publication number
- GB581419A GB581419A GB6580/44A GB658044A GB581419A GB 581419 A GB581419 A GB 581419A GB 6580/44 A GB6580/44 A GB 6580/44A GB 658044 A GB658044 A GB 658044A GB 581419 A GB581419 A GB 581419A
- Authority
- GB
- United Kingdom
- Prior art keywords
- valve
- input
- phase shift
- output
- wave
- 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
- 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
- H04B1/06—Receivers
- H04B1/16—Circuits
- H04B1/1638—Special circuits to enhance selectivity of receivers not otherwise provided for
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Amplifiers (AREA)
Abstract
581,419. Square wave and sine wave generators ; frequency dividers. STANDARD TELEPHONES & CABLES, Ltd. April 7, 1944, No. 6580. Convention date, Sept. 18, 1942. [Class 40 (v)] In a thermionic valve circuit for producing an output wave different from the input, a resistance - capacity phase shifting network couples the output to the input, producing, with the valve, a 360 degree shift at a harmonically related frequency of the input, the circuit normally being maintained quiescent in the absence of an applied wave, and a high input impedance being provided over which the input is applied to the valve. The phase shift network 3, 4, 2, Fig. 1, coupling the anode to the grid of valve 1 is arranged to give a 180 degree phase shift at the fundamental or some harmonic of the applied square wave A, to produce an output sine wave B. To prevent oscillation in the absence of an incoming signal, the load 18 is made small and the screen grid potential adjusted. The high resistance 23 attenuates the input so that frequencies other than that required are not amplified to an appreciable extent. To produce sub-harmonics, as in a frequency divider, the phase shift network is adjusted for a submultiple frequency of the fundamental and the input driving voltage is increased. In a modification, Fig. 2 (not shown), the condensers and resistances in the phase shift network 2. 3, 4, are interchanged. In a further modification, Fig. 3, for producing a square wave output, the valve 40 is back coupled over a phase shift network to give 360 degrees shift at the fundamental or a sub-harmonic and feeds a triode 50 normally biassed off by the potential drop over the common cathode load 54. The positive half cycles cause valve 50 to conduct, in turn biasing off valve 40. Valve 50 continues to conduct until condenser 57 discharges sufficiently to reduce the anode current and allow valve 40 to pass current, valve 50 then being cut off by multivibrator action over the common coupling resistance 54.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US581419XA | 1942-09-18 | 1942-09-18 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB581419A true GB581419A (en) | 1946-10-11 |
Family
ID=22014959
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB6580/44A Expired GB581419A (en) | 1942-09-18 | 1944-04-07 | Selective amplifiers employing electron discharge tubes |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB581419A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3139537A (en) * | 1960-12-12 | 1964-06-30 | Collins Radio Co | Low frequency square wave to sine wave shaper |
US3141142A (en) * | 1959-12-15 | 1964-07-14 | Internat Standard Elecric Corp | Relaxation oscillator employing selective and non-selective feedback |
-
1944
- 1944-04-07 GB GB6580/44A patent/GB581419A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3141142A (en) * | 1959-12-15 | 1964-07-14 | Internat Standard Elecric Corp | Relaxation oscillator employing selective and non-selective feedback |
US3139537A (en) * | 1960-12-12 | 1964-06-30 | Collins Radio Co | Low frequency square wave to sine wave shaper |
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