US1872347A - Amplifier tube control - Google Patents
Amplifier tube control Download PDFInfo
- Publication number
- US1872347A US1872347A US351405A US35140529A US1872347A US 1872347 A US1872347 A US 1872347A US 351405 A US351405 A US 351405A US 35140529 A US35140529 A US 35140529A US 1872347 A US1872347 A US 1872347A
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- US
- United States
- Prior art keywords
- tube
- circuit
- grid
- input
- amplifier
- 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
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/02—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
- H03F1/04—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in discharge-tube amplifiers
-
- 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
- H04B1/1607—Supply circuits
- H04B1/1623—Supply circuits using tubes
Definitions
- My present invention relates to amplifier tubes, and, more particularly, to a transmitter amplifier circuit employing a portion of its input to control tion.
- the amplifier tubes In operating a transmitter, the amplifier tubes should, for ideal performance, be sub- 7 jected to maximum plate heatingonly when the radio frequency input is at a maximum.
- an expedient which involves the utilization of a portion of the'input radio frequency current, I achieve satisfactory performance of the amplifier tubes.
- Another important object of the invention is to provide an amplifier tube in a transmitting circuit, which tube is biased highly negative when the tube is not subjected to radio frequency impulses, and additional means to supply a variable potential counter to the grid biasing potential in accordance with input variations.
- Still another object of the invention is to provide an amplifier tube circuit which includes in the grid circuit of the tube means, responsive to variations in the radio frequency input, to supply a filtered continuous current to the said grid circuit, the potential of the current being counter to the biasing potential of the grid whereby the average current flowing through the plate circuit of the tube increases with the input amplitude.
- r Fig.1 is a circuit diagram embodying my invention
- Fig. 2 is a graphic representation of the operating characteristic of the tube shown in Fig. 1. ;j'
- FIG. 1 there is shown an amplifier tube circuit in Fig. 1, the circuit showing only the connections to and from the amplifier tube for the sake'of simplicity.
- the input circuit A is coupled,as shown, to the grid-filament circuit of the tube A. T., the tube being any conventional transmitter amplifier tube, the plate, or output, circuit of which is energized by as' source of current B.
- The: grid of the tube is biased by a source of current C',-an'd includes, in circuit with the biasing source, a condenser C shunted by a resistance or leak R. I f
- the input circuit A is coupled to the grid circuit of the tube at two points D', E, the
- the coupling E being effected between the condenser C and the grid of the tube, while the. coupling D is made to. a rectifier circuit shunted across the resistance R.
- the secondary coil of the coupling D has associated V therewitha variable slider 3 at one end thereof, and is connected at the other endfto any conventional rectifier device.
- a filtering section comprising choke coilsL L each of which coils is in series withthe slider 3 and the rectifier respectively, a condenser 0 be- -ing connected across the coil, the purpose of the filtering section being to smooth out'the pulsating direct current derived from the rec'- tifier.
- the grid of the tube A. T. is normallybiased highly negative by the source (1.
- the rectifier circuit is so arranged across the resistance R, that, when a radio frequency current flows cuit of the tube, said second source being of sufiicient magnitude to reduce the current flowing in the said anode circuit to substan tially zero in the absence of signal voltage in the said grid circuit, and a third source of potential disposed in said grid circuit, said third source being derived from said signal voltage source and arranged in opposition to said second source in such a manner that the operating grid potential of the tube is of suitable value for efficient amplification only while signalvoltage is impressed on the grid circuit of said tube.
- I have eviseda methodand means for controlling. the consumption of plate current in an amplifier tube, used either in a transmitting or even in a receiving circuit. It is to be observed that this method not only conserves power, but also avoids the necessity for-running theplate of the tube at high temperatures during periods when signals are not being applied to its grid. Thus, the tube "may be arranged to utilize momentary over-loading during instants of great signal input without overheating the plate.
- An arrangement forreducing current losses in the anode circuitof a power amplifieritube comprising a source of signal voltage, a source of negative potential disposed in the grid cirlOll ice ice
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Power Engineering (AREA)
- Amplifiers (AREA)
Description
Aug. 16, 1932. w A ROBERTS 1,872,347
AMPLIFIER TUBE CONTROL Filed March 30, 1929 WALTER VAN B. ROBERTS Patented Aug. 16, 1932 UNITED STATES PATENT OF F ICE- WALTER VAN B. ROBERTS, OF PRINCETON, NEW JERSEY, ASSIGNOR TO RADIO COR PORA'I'ION OFAMEBICA, A CORPORATION OF DELAWARE V AMPLIFIER roan CONTROL My present invention relates to amplifier tubes, and, more particularly, to a transmitter amplifier circuit employing a portion of its input to control tion.
In operating a transmitter, the amplifier tubes should, for ideal performance, be sub- 7 jected to maximum plate heatingonly when the radio frequency input is at a maximum. By employing an expedient which involves the utilization of a portion of the'input radio frequency current, I achieve satisfactory performance of the amplifier tubes.
It is one of the main objects of the present invention to provide an amplifier tube operating in such a manner that the biasing potential on its grid is reduced when the input is of a large amplitude, and the grid bias is at a maximum when the input to the tube is small, thus resulting in control of the plate current consumption.
Another important object of the invention is to provide an amplifier tube in a transmitting circuit, which tube is biased highly negative when the tube is not subjected to radio frequency impulses, and additional means to supply a variable potential counter to the grid biasing potential in accordance with input variations.
Still another object of the invention is to provide an amplifier tube circuit which includes in the grid circuit of the tube means, responsive to variations in the radio frequency input, to supply a filtered continuous current to the said grid circuit, the potential of the current being counter to the biasing potential of the grid whereby the average current flowing through the plate circuit of the tube increases with the input amplitude.
The novel features which I believe to be characteristic of my invention are set forth in particularity in the appended claim, the invention itself, however, as to both its organization and method of operation, will best be understood by reference to the following description taken in connection with r the drawing in which I have indicated diagrammatically one circuit organization whereby my invention may be carried into effect.
plate current consump- In the drawing, r Fig.1 is a circuit diagram embodying my invention,
Fig. 2 is a graphic representation of the operating characteristic of the tube shown in Fig. 1. ;j'
Referring to the accompanying drawing, there is shown an amplifier tube circuit in Fig. 1, the circuit showing only the connections to and from the amplifier tube for the sake'of simplicity. The input circuit A is coupled,as shown, to the grid-filament circuit of the tube A. T., the tube being any conventional transmitter amplifier tube, the plate, or output, circuit of which is energized by as' source of current B. The: grid of the tube is biased by a source of current C',-an'd includes, in circuit with the biasing source, a condenser C shunted by a resistance or leak R. I f
The input circuit A is coupled to the grid circuit of the tube at two points D', E, the
coupling E being effected between the condenser C and the grid of the tube, while the. coupling D is made to. a rectifier circuit shunted across the resistance R. The secondary coil of the coupling D has associated V therewitha variable slider 3 at one end thereof, and is connected at the other endfto any conventional rectifier device.
' The output from the slider 3 and rectifier is passed through a filtering section, the latter comprising choke coilsL L each of which coils is in series withthe slider 3 and the rectifier respectively, a condenser 0 be- -ing connected across the coil, the purpose of the filtering section being to smooth out'the pulsating direct current derived from the rec'- tifier.
' The operation of the circuit will appear obvious from the arrangement shown, 'it being understood that by properly proportioning thecouplings D, E, the leak resistance R, and the" condensers C C the amplifier grid can be kept just more negative than the value of the radio frequency input at Awhen large inputs occur, but very much negative when V in accordance with the change of input to the tube.
For example, in Fig. 2, I have shown what would happen on the characteristic curve of the tube A. T. when the input at A increases from one value to another, it being observed that when the increase occurs the operating point of the grid is moved from point 1 to point 2 on the characteristic curve, thus increasing the plate current flowing through the plate circuit of the tube only when the radio frequency inputincreases. 7
The grid of the tube A. T. is normallybiased highly negative by the source (1. The rectifier circuit is so arranged across the resistance R, that, when a radio frequency current flows cuit of the tube, said second source being of sufiicient magnitude to reduce the current flowing in the said anode circuit to substan tially zero in the absence of signal voltage in the said grid circuit, and a third source of potential disposed in said grid circuit, said third source being derived from said signal voltage source and arranged in opposition to said second source in such a manner that the operating grid potential of the tube is of suitable value for efficient amplification only while signalvoltage is impressed on the grid circuit of said tube.
WALTER VAN B. ROBERTS.
through the input A, a portion of the input is imposed upon the rectifier circuit through the coupling D while the remainder of the inputis imposed directly upon the coupling E. The slider 3 being positioned'for optimum operation, the rectifier will pass a puleating direct current through the filtersection, thepulsating current being smoothed be seen that I have eviseda methodand means for controlling. the consumption of plate current in an amplifier tube, used either in a transmitting or even in a receiving circuit. It is to be observed that this method not only conserves power, but also avoids the necessity for-running theplate of the tube at high temperatures during periods when signals are not being applied to its grid. Thus, the tube "may be arranged to utilize momentary over-loading during instants of great signal input without overheating the plate. v I
While I have indicated and described only one system for carrying my invention into efieet, itqwill' be apparent to one skilled in w i the art that my invention is by no means limited tothe particular organization shown and described, but that many modifications T in thecircuit arran ement as well as in the apparatus employe may be made without departing from the scope of my invention as set forth in the appended claim.
What I claim is:
An arrangement forreducing current losses in the anode circuitof a power amplifieritube comprising a source of signal voltage, a source of negative potential disposed in the grid cirlOll ice ice
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US351405A US1872347A (en) | 1929-03-30 | 1929-03-30 | Amplifier tube control |
DE1930574457D DE574457C (en) | 1929-03-30 | 1930-03-28 | Method for reducing the anode power consumption in an amplifier circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US351405A US1872347A (en) | 1929-03-30 | 1929-03-30 | Amplifier tube control |
Publications (1)
Publication Number | Publication Date |
---|---|
US1872347A true US1872347A (en) | 1932-08-16 |
Family
ID=23380776
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US351405A Expired - Lifetime US1872347A (en) | 1929-03-30 | 1929-03-30 | Amplifier tube control |
Country Status (2)
Country | Link |
---|---|
US (1) | US1872347A (en) |
DE (1) | DE574457C (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE553926A (en) * | 1954-02-08 | |||
DE1047845B (en) * | 1956-07-27 | 1958-12-31 | Gen Electric | Power-saving circuit for the low-frequency part of a radio receiver equipped with transistors |
DE1108740B (en) * | 1957-07-03 | 1961-06-15 | Sueddeutsche Telefon App Kabel | Arrangement to avoid overdriving a microphone amplifier equipped with transistors |
NL267845A (en) * | 1959-04-27 | 1900-01-01 |
-
1929
- 1929-03-30 US US351405A patent/US1872347A/en not_active Expired - Lifetime
-
1930
- 1930-03-28 DE DE1930574457D patent/DE574457C/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
DE574457C (en) | 1933-04-13 |
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