US2088231A - Amplifier gain control - Google Patents
Amplifier gain control Download PDFInfo
- Publication number
- US2088231A US2088231A US648756A US64875632A US2088231A US 2088231 A US2088231 A US 2088231A US 648756 A US648756 A US 648756A US 64875632 A US64875632 A US 64875632A US 2088231 A US2088231 A US 2088231A
- Authority
- US
- United States
- Prior art keywords
- grid
- tube
- gain control
- amplifier gain
- screen
- 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 - Lifetime
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Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G1/00—Details of arrangements for controlling amplification
- H03G1/0005—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal
- H03G1/0011—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal the device being at least one of the amplifying tubes of the amplifier
Definitions
- the present invention relates to a circuit arrangement comprising the use of screen-grid tubes with variable gain-reciprocal (1m) for regulation of amplification.
- Tubes have been disclosed in the prior art capable of a large range of modulation (variablet tubes) whose characteristic droops in a very gradual way with increase of the negative grid potential.
- Tubes of this kind are preferably designed in the form of screen-grid tubes, and they are used in radio frequency amplifiers in which, according to the grid biasing potential dependent on the magnitude of the incoming signal amplitude, the gain is capable of variation.
- anamplifier stage including a variable mu tube I having a tunable input circuit 2 coupled to a source of signals, as an antenna 3.
- the plate circuit of tube l is coupled to a succeeding tunable circuit 4 of a next stage of amplification, if desired.
- the source AB supplies the plate with positive potential.
- the screen 5 is connected through a variable tap- 6 to a resistor 1 across the source AB.
- the source C supplies negative bias to the grid 9 of tube I.
- the tap It! connects the grid 9 to resistor 8 across source C.
- the uni-control device ll controls taps 6, It so that with an .increase of negative grid bias there is also secured an increase 'in screen grid voltage.
- the tube I may be designed in any one of the many ways shown by Ballantine and Snow in the I. R. E. for Dec. 1930.
- the screen grid 5 may be conical in shape.
- the control I I may be actuated by a galvanometer in the detector plate circuit to provide automatic volume control.
- a radio receiver including a screen grid amplifier tube of the variable mu type, means for impressing signals between the control grid and cathode of the tube, means for maintaining the control grid at a negative bias with respect to the cathode, means for applying a positive voltage to the screen grid of said tube, and means for simultaneously varying the potentials of said control grid and screen grid in increasingly negative and positive senses respectively.
- a screen grid amplifier tube of the variable mu type In combination with a source of signal energy, a screen grid amplifier tube of the variable mu type, a tuned circuit connected between the control grid and cathode of the tube, means for varying the potential of said control grid over a relatively wide negative potential range, means for varying the potential of the screen grid of the tube over a positive potential range, and a common means for simultaneously adjusting both said varying means in increasingly negative and positive senses respectively.
Description
July 27, 1937. H, COHN 2,088,231 AMPLIFIER GAIN CONTROL Fzued Dec. 24, 1952 ill" INVENTOR HENNY CO H N ATTORNEY Patented July 27, 1937 UNITED STATES AMPLIFIER GAIN CONTROL Henny Oohn, Berlin, Germany, assignor to Telefunken Gesellschaft fiir Drahtlose Telegraphic m. b. H., Berlin, Germany, a corporation of Germany Application December24, 1932, Serial No. 648,756
In Germany January 22, 1932 2 Claims.
The present invention relates to a circuit arrangement comprising the use of screen-grid tubes with variable gain-reciprocal (1m) for regulation of amplification.
Tubes have been disclosed in the prior art capable of a large range of modulation (variablet tubes) whose characteristic droops in a very gradual way with increase of the negative grid potential. Tubes of this kind are preferably designed in the form of screen-grid tubes, and they are used in radio frequency amplifiers in which, according to the grid biasing potential dependent on the magnitude of the incoming signal amplitude, the gain is capable of variation.
However, this entails one drawback in so far as according to the magnitude of the grid biasing potential the plate currents will turn out widely different. For instance, when receiving a powerful transmitter station, the grid biasing voltage will have to be chosen rather high because it will only be then that the characteristic will slope off and the amplification become smaller, and this is accompanied by the arising of small plate cur rents. If, on the contrary, in order to receive feeble transmitters requiring very marked amplification for proper reception, the tubes are operated at the steep portion of the characteristic,
then as a result large plate currents will be in- "volved.
In the single figure is shown anamplifier stage including a variable mu tube I having a tunable input circuit 2 coupled to a source of signals, as an antenna 3. The plate circuit of tube l is coupled to a succeeding tunable circuit 4 of a next stage of amplification, if desired. The source AB supplies the plate with positive potential. The screen 5 is connected through a variable tap- 6 to a resistor 1 across the source AB. The source C supplies negative bias to the grid 9 of tube I. The tap It! connects the grid 9 to resistor 8 across source C. The uni-control device ll controls taps 6, It so that with an .increase of negative grid bias there is also secured an increase 'in screen grid voltage. The tube I may be designed in any one of the many ways shown by Ballantine and Snow in the I. R. E. for Dec. 1930. For instance, the screen grid 5 may be conical in shape. Also, the control I I may be actuated by a galvanometer in the detector plate circuit to provide automatic volume control.
What is claimed is:-
1. A radio receiver including a screen grid amplifier tube of the variable mu type, means for impressing signals between the control grid and cathode of the tube, means for maintaining the control grid at a negative bias with respect to the cathode, means for applying a positive voltage to the screen grid of said tube, and means for simultaneously varying the potentials of said control grid and screen grid in increasingly negative and positive senses respectively.
2. In combination with a source of signal energy, a screen grid amplifier tube of the variable mu type, a tuned circuit connected between the control grid and cathode of the tube, means for varying the potential of said control grid over a relatively wide negative potential range, means for varying the potential of the screen grid of the tube over a positive potential range, and a common means for simultaneously adjusting both said varying means in increasingly negative and positive senses respectively.
HENNY COHN.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2088231X | 1932-01-22 |
Publications (1)
Publication Number | Publication Date |
---|---|
US2088231A true US2088231A (en) | 1937-07-27 |
Family
ID=7984325
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US648756A Expired - Lifetime US2088231A (en) | 1932-01-22 | 1932-12-24 | Amplifier gain control |
Country Status (1)
Country | Link |
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US (1) | US2088231A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2454150A (en) * | 1944-03-13 | 1948-11-16 | Rca Corp | Voltage adjusting system |
US2646472A (en) * | 1950-09-06 | 1953-07-21 | Crosley Broadcasting Corp | Amplifier control system |
US2851523A (en) * | 1954-02-15 | 1958-09-09 | Zenith Radio Corp | Television receiver synchronizing system |
-
1932
- 1932-12-24 US US648756A patent/US2088231A/en not_active Expired - Lifetime
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2454150A (en) * | 1944-03-13 | 1948-11-16 | Rca Corp | Voltage adjusting system |
US2646472A (en) * | 1950-09-06 | 1953-07-21 | Crosley Broadcasting Corp | Amplifier control system |
US2851523A (en) * | 1954-02-15 | 1958-09-09 | Zenith Radio Corp | Television receiver synchronizing system |
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