DE446926C - Decoupling device for high frequency amplifier tubes with two control electrodes - Google Patents
Decoupling device for high frequency amplifier tubes with two control electrodesInfo
- Publication number
- DE446926C DE446926C DEW70427D DEW0070427D DE446926C DE 446926 C DE446926 C DE 446926C DE W70427 D DEW70427 D DE W70427D DE W0070427 D DEW0070427 D DE W0070427D DE 446926 C DE446926 C DE 446926C
- Authority
- DE
- Germany
- Prior art keywords
- frequency amplifier
- high frequency
- decoupling device
- control electrodes
- amplifier tubes
- 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
- 239000003990 capacitor Substances 0.000 claims description 3
- 238000006073 displacement reaction Methods 0.000 description 4
- BTCSSZJGUNDROE-UHFFFAOYSA-N gamma-aminobutyric acid Chemical compound NCCCC(O)=O BTCSSZJGUNDROE-UHFFFAOYSA-N 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 230000001808 coupling effect Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
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
- H03F1/08—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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microwave Amplifiers (AREA)
- Amplifiers (AREA)
Description
Entkopplungseinrichtung für Hochfrequenzverstärkerröhxen mit zwei Steuerelektroden. Die Schwierigkeit der Hochfrequenzverstäz kung kurzer Wellen liegt in erster Linie in den inneren Röhrenkapazitäten. Die zu verstärkende Wechselspannung treibt über die Röhrenkapazitäten einen Verschiebungsstrom durch den Anodenkreis und umgekehrt die Anodenwechselspannung einen Verschiebungsstrom durch den Eingangskreis. Mit kürzer werdenden Wellen überwiegen die Verschiebungsströme irniner mehr die Elektronenströme, so daß der Verstärker immer unbrauchbarer wird. Bezeichnet der Index i den Eingangskreis, der Index 2 den Anodenkreis, so lassen sich die Verschiebungsströme durch folgende Gleichungen darstellen: i2--nliwK-naiwKa (_) il=nliwKl+n2iwK (2) Die störende Kopplungswirkung liegt in dem Kapazitätsfaktor I(. Bei der gewöhnlichen Dreielektrodenröhre ist I( die. Kapazität zwischen Gitter und Anode.Decoupling device for high frequency amplifier tubes with two Control electrodes. The difficulty of high frequency amplification short waves lies primarily in the inner tube capacities. The alternating voltage to be amplified drives a displacement current through the anode circuit via the tube capacitance and conversely, the anode alternating voltage creates a displacement current through the input circuit. As the waves get shorter, the displacement currents outweigh them more Electron streams, so that the amplifier becomes more and more useless. Designated the index i the input circuit, the index 2 the anode circuit, so the displacement currents represented by the following equations: i2 - nliwK-naiwKa (_) il = nliwKl + n2iwK (2) The disturbing coupling effect lies in the capacity factor I ( Three-electrode tube is I (the. Capacitance between grid and anode.
Benutzt man nun eine Röhre mit zwei Steuerelektroden a und b, die beispielsweise nach Abb. i in der Röhre angeordnet sind, und führt in bekannter Weise die zu verstärkende Wechselspannung zwischen die beiden Steuerelektroden, so wird der Kapazitätsfaktor I( wobei c, d, e und f die Teilkapazitäten zwischen,den Steuerelektroden einerseits und Anode g und Kathode h anderseits bedeuten. Man sieht hieraus, daß es möglich sein muß, den Kapazitätsfaktor I( zum Verschwinden zu bringen, indem man die Röhrenkapazitäten so abgleicht, daß sie der Proportion genügen. Da auch die Zuleitungen, Sockel und Stecker einen Beitrag zu diesen Teilkapazitäten liefern, hat es keinen Zweck, die Röhrenkapazitäten selbst nach dieser Proportion abzugleichen. Wohl aber ist es möglich dadurch, daß man zu zweien dieser Teilkapazitäten größere Kondensatoren parallel schaltet, die man dann leicht so abgleichen kann, daß diese Proportion erfüllt ist. Wenn diese Proportion nicht erfüllt ist, dann wirkt die Kopplung vom Anodenkreis auf den Eingangskreis im Sinne der Schwingungserzeugung, wenn K positiv, oder im schwächenden Sinne, wenn K negativ ist, so daß man durch geeignete Abgleichung von I( alle drei Fälle verwirklichen kann.If you now use a tube with two control electrodes a and b, which are arranged in the tube as shown in Fig. where c, d, e and f mean the partial capacitances between the control electrodes on the one hand and anode g and cathode h on the other hand. It can be seen from this that it must be possible to make the capacity factor I (disappear by adjusting the tube capacities so that they are in proportion suffice. Since the supply lines, sockets and plugs also contribute to these partial capacities, there is no point in adjusting the tube capacities themselves according to this proportion. However, it is possible by connecting larger capacitors in parallel to two of these partial capacitances, which can then easily be adjusted so that this proportion is met. If this proportion is not fulfilled, then the coupling from the anode circuit to the input circuit acts in the sense of oscillation generation if K is positive, or in a weakening sense if K is negative, so that all three cases can be realized by suitable adjustment of I (.
Sobald I( verschwunden ist, sind die beiden Kreise entkoppelt.As soon as I (disappears, the two circles are decoupled.
Diese Entkopplung ist frequenzunabhängig. Sie hat vor anderen Entkopplungsverfahren, wie z. B. dem N:eutrodyneempfänger, den Vorzug, daß sie an der Röhre selbst anzubringen ist und nicht mit der Schaltung selbst verbunden wird, so daß z. B. für verschiedene Wellenbereiche die Spulen leicht ausgewechselt werden können. Abb. 2 zeigt eine bei-. spielsweise Ausführung eines Hochfrequenzverstärkers mit der beschriebenen Entkopplung, die durch die Kondensatoren! und k bewirkt wird.This decoupling is frequency independent. She has before other decoupling procedures, such as B. the N: eutrodyne receiver, the advantage of being attached to the tube itself is and is not connected to the circuit itself, so that, for. B. for different Shaft areas the coils can be easily exchanged. Fig. 2 shows a at-. for example, execution of a high frequency amplifier with the described Decoupling made by the capacitors! and k is effected.
Claims (3)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEW70427D DE446926C (en) | 1925-09-11 | 1925-09-11 | Decoupling device for high frequency amplifier tubes with two control electrodes |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEW70427D DE446926C (en) | 1925-09-11 | 1925-09-11 | Decoupling device for high frequency amplifier tubes with two control electrodes |
Publications (1)
Publication Number | Publication Date |
---|---|
DE446926C true DE446926C (en) | 1927-07-20 |
Family
ID=7608635
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEW70427D Expired DE446926C (en) | 1925-09-11 | 1925-09-11 | Decoupling device for high frequency amplifier tubes with two control electrodes |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE446926C (en) |
-
1925
- 1925-09-11 DE DEW70427D patent/DE446926C/en not_active Expired
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