US2111702A - Circuit arrangement for amplifying electric oscillations - Google Patents
Circuit arrangement for amplifying electric oscillations Download PDFInfo
- Publication number
- US2111702A US2111702A US90790A US9079036A US2111702A US 2111702 A US2111702 A US 2111702A US 90790 A US90790 A US 90790A US 9079036 A US9079036 A US 9079036A US 2111702 A US2111702 A US 2111702A
- Authority
- US
- United States
- Prior art keywords
- circuit arrangement
- frequency
- capacity
- electric oscillations
- anode
- 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
Links
- 230000010355 oscillation Effects 0.000 title description 5
- 239000004020 conductor Substances 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 230000001808 coupling effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J19/00—Details of vacuum tubes of the types covered by group H01J21/00
- H01J19/82—Circuit arrangements not adapted to a particular application of the tube and not otherwise provided for
-
- 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
- H03F1/08—Modifications of amplifiers to reduce detrimental influences of internal impedances of amplifying elements
-
- 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
- H03F1/08—Modifications of amplifiers to reduce detrimental influences of internal impedances of amplifying elements
- H03F1/14—Modifications of amplifiers to reduce detrimental influences of internal impedances of amplifying elements by use of neutralising means
- H03F1/16—Modifications of amplifiers to reduce detrimental influences of internal impedances of amplifying elements by use of neutralising means in discharge-tube amplifiers
Definitions
- amplifying circuits comprising amplifying valves retroaction of the anode circuit on the control grid circuit which under certain conditions results in self oscillation 5 of the circuit.
- amplifying valves retroaction of the anode circuit on the control grid circuit which under certain conditions results in self oscillation 5 of the circuit.
- the retroaction of the anode circuit on the control grid circuit is not only due to the anode-control grid capacity but also to the mutual induction between the cathode lead and the conductors to the auxiliary grids and to the anode.
- f designates the frequency of the oscillations to be amplified and A is a constant which is determined by the mutual induction between the supply conductors.
- the equivalent capacity is composed of a positive constant part and a negative part depending on the frequency.
- the constant'part of the equivalent capacity or that part which depends on the frequency is so adjusted that for 40 the frequency of the oscillations to be amplified the equivalent capacity is substantially zero.
- the constant part Cago of the equivalent capacity may be controlled for example by a suitable choice of the screening between the control grid and the anode within the amplifying valve.
- the part that depends on the frequency can be controlled by modifying the coupling between the supply conductors to the electrodes of the valve.
- the single figure of the drawing shows schematically a tube arrangement used to explain in more detail the various features of the present invention.
- a tube T is shown provided with an anode, a cathode and a control electrode.
- the control electrode is connected to the cathode of the tube through an external circuit including the grid impedance Zg and the anode of the tube is shown connected to the cathode thereof through the plate impedance Zp.
- M The mutual between the supply conductors is indicated by M and the capacity existing between the grid and plate is indicated by the label Cago.
- the mutual M may be made so as to be equivalent to the capacity between the grid 20 and plate so as to produce an equivalent capacity which is substantially zero for any particular frequency which it is desired to amplify.
- the circuit arrangement according to the invention is particularly important in connection with amplifiers that are always tuned to one and the same frequency, as is the case, for example, in television receiving sets.
- the frequency at which the equivalent capacity is zero may be chosen so as to be equal to the frequency at which self-oscillation would be set up but for the use of the invention.
- the method of eliminating at a predetermined desired frequency the coupling between the input and output circuits that occurs within the tube structure itself which comprises proportioning the grid-plate capacity of the tube and the mutual inductance between grid and plate leads 0 within the tube to produce equal and opposite a coupling effects at said frequency.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Amplifiers (AREA)
- Microwave Amplifiers (AREA)
Description
March 22, 1938. M J O, R T 2,111,792
CIRCUIT ARRANGEMENT FOR AMPLIFYING ELECTRIC OSCILLATIONS Filed July 15, 1936 v INVENTOR M-J- 0- STRUTT ATTORN EY Patented Mar. 22, 1938 liiE' CIRCUIT ARRANGEIVIENT FOR ANIPLIIFYING ELECTRIC OSCILLATIONS Maximiliaan Julius Otto Strutt,
Eindhoven,
7 Application July 15,1936, Serial No. 90,790
In the Netherlands July 26, 1935 1 Claim.
As is well known, there is in amplifying circuits comprising amplifying valves retroaction of the anode circuit on the control grid circuit which under certain conditions results in self oscillation 5 of the circuit. In the case of comparatively low frequency of the oscillations to be amplified retroaction is brought about solely by the anodegrid capacity of the amplifying valve. In the case of very high frequencies the retroaction of the anode circuit on the control grid circuit is not only due to the anode-control grid capacity but also to the mutual induction between the cathode lead and the conductors to the auxiliary grids and to the anode. The total reaction in the case of very high frequencies can, however, be reduced to an equivalent impedance between the anode and the control grid which consequently comprises all of the reactions due to the above-mentioned causes. Now, measuring operations carried out on a great number of amplifying valves revealed that this equivalent impedance can be represented by a capacity Cag as is indicated by the formula:
r In this formula Cago designates the static capacity between the anode and the control grid,
f designates the frequency of the oscillations to be amplified and A is a constant which is determined by the mutual induction between the supply conductors.
The formula shows that the equivalent capacity is composed of a positive constant part and a negative part depending on the frequency. Thus, according to the invention'the constant'part of the equivalent capacity or that part which depends on the frequency is so adjusted that for 40 the frequency of the oscillations to be amplified the equivalent capacity is substantially zero.
The constant part Cago of the equivalent capacity may be controlled for example by a suitable choice of the screening between the control grid and the anode within the amplifying valve. The part that depends on the frequency can be controlled by modifying the coupling between the supply conductors to the electrodes of the valve.
The single figure of the drawing shows schematically a tube arrangement used to explain in more detail the various features of the present invention. In said drawing a tube T is shown provided with an anode, a cathode and a control electrode. The control electrode is connected to the cathode of the tube through an external circuit including the grid impedance Zg and the anode of the tube is shown connected to the cathode thereof through the plate impedance Zp. 15 The mutual between the supply conductors is indicated by M and the capacity existing between the grid and plate is indicated by the label Cago. In accordance with the invention, it is evident that the mutual M may be made so as to be equivalent to the capacity between the grid 20 and plate so as to produce an equivalent capacity which is substantially zero for any particular frequency which it is desired to amplify.
The circuit arrangement according to the invention is particularly important in connection with amplifiers that are always tuned to one and the same frequency, as is the case, for example, in television receiving sets. In the case of tunable amplifiers the frequency at which the equivalent capacity is zero may be chosen so as to be equal to the frequency at which self-oscillation would be set up but for the use of the invention.
I claim:
The method of eliminating at a predetermined desired frequency the coupling between the input and output circuits that occurs within the tube structure itself which comprises proportioning the grid-plate capacity of the tube and the mutual inductance between grid and plate leads 0 within the tube to produce equal and opposite a coupling effects at said frequency.
MAXIMILIAAN JULIUS OTTO STRUTT.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL474675X | 1935-07-26 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US2111702A true US2111702A (en) | 1938-03-22 |
Family
ID=19786508
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US90790A Expired - Lifetime US2111702A (en) | 1935-07-26 | 1936-07-15 | Circuit arrangement for amplifying electric oscillations |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US2111702A (en) |
| BE (1) | BE416639A (en) |
| FR (1) | FR808395A (en) |
| GB (1) | GB474675A (en) |
| NL (1) | NL46307C (en) |
-
0
- BE BE416639D patent/BE416639A/xx unknown
- NL NL46307D patent/NL46307C/xx active
-
1936
- 1936-05-01 GB GB12439/36A patent/GB474675A/en not_active Expired
- 1936-07-15 US US90790A patent/US2111702A/en not_active Expired - Lifetime
- 1936-07-21 FR FR808395D patent/FR808395A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR808395A (en) | 1937-02-04 |
| GB474675A (en) | 1937-11-01 |
| NL46307C (en) | |
| BE416639A (en) |
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