US2210956A - Coupling circuit - Google Patents
Coupling circuit Download PDFInfo
- Publication number
- US2210956A US2210956A US17598337A US2210956A US 2210956 A US2210956 A US 2210956A US 17598337 A US17598337 A US 17598337A US 2210956 A US2210956 A US 2210956A
- Authority
- US
- United States
- Prior art keywords
- coupling
- generator
- internal resistance
- circuit
- coupling circuit
- 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
- 238000010168 coupling process Methods 0.000 title description 15
- 238000005859 coupling reaction Methods 0.000 title description 15
- 230000008878 coupling Effects 0.000 title description 11
- 230000003412 degenerative effect Effects 0.000 description 6
- 238000004804 winding Methods 0.000 description 6
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J1/00—Frequency-division multiplex systems
- H04J1/02—Details
- H04J1/06—Arrangements for supplying the carrier waves ; Arrangements for supplying synchronisation signals
-
- 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
- H03F1/34—Negative-feedback-circuit arrangements with or without positive feedback
- H03F1/36—Negative-feedback-circuit arrangements with or without positive feedback in discharge-tube amplifiers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J1/00—Frequency-division multiplex systems
- H04J1/02—Details
- H04J1/12—Arrangements for reducing cross-talk between channels
Definitions
- My invention relates to a coupling circuit for connecting a generator to a load.
- the internal resistance f the latter brings about an undesirable mutual coupling of the circuits.
- This take place for instance, in carrier wave telephony-or-telegraphy, in which a plurality of carrier wave systems, each consisting of a certain number of channels, are operated simultaneously. It is desirable to feed the channels of the various systems operating at the same carrier wave frequency from a common carrier generator, but this introduces diiculties.
- the internal resistance of the common generator involves crosstalk from the channel of sponding channel of the just the degenerative back-coupling that the amplier has a low internal resistance.
- a generator G having an internal impedance Zi is connected to the which form part of two diiierent carrier wave systems and to which the carrier wave produced by the generator Gis to be supplied.
- ampliier A is backcoupled in a degenerative manner.
- the amplifier comprises a thermionic tube 5 having a grid 9, a plate lll, and an incandescible cathode ll, supplied with heating current by a battery I6.
- Plate I il is connected through a condenser l to one end of the primary winding l2 of a coupling transformer 3; the other end of this winding being connected to the cathode Connected between plate l and cathode ll is a resistance 6 and a source of plate voltage l5.
- Winding I2 is a potentiometer whereby the coupling between the two carrier wave systems will be materially reduced.
- degenerative back-coupling involves variation of the internal resistance of the amplifying tube.
- the internal resistance of the amplifying tube with degenerative back-coupling may be represented by the Iormula:
- an amplifying tube having an 10 anode, a' cathode and a grid, a plate circuit for said tube insulating a coupling transformer having a primary winding and a secondary Winding connected to said loads, a potentiometer connected across said primary Winding, and a grid circuit for said tube including said generator and a portion of said potentiometer, said portions being so selected that the amplifying tube vhas a low internal resistance.
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Power Engineering (AREA)
- Amplifiers (AREA)
Description
Aug. 13, 1940- T. s. SKILLMAN 2,210,956
COUPLING CIRCUIT Filed Nov. 22, 1957 Patented Aug. 13, 1940 UNITED STATES PATENT vOFFICE 2,210,956 COUPLTNG CIRCUIT Application November 22, 1937, Serial No. 175,983 In Germany November 23, 1936 3 Claims.
My invention relates to a coupling circuit for connecting a generator to a load.
When a plurality of electric circuits are fed from a common generator, the internal resistance f the latter brings about an undesirable mutual coupling of the circuits. This take place for instance, in carrier wave telephony-or-telegraphy, in which a plurality of carrier wave systems, each consisting of a certain number of channels, are operated simultaneously. It is desirable to feed the channels of the various systems operating at the same carrier wave frequency from a common carrier generator, but this introduces diiculties. More particularly, the internal resistance of the common generator involves crosstalk from the channel of sponding channel of the just the degenerative back-coupling that the amplier has a low internal resistance.
In order that the invention may be clearly understood and readily carried into effect, I shall describe the same in more detail with reference to the accompanying drawing in which the single figure is a schematic diagram of a circuit embodying the invention.
As shown in the drawing, a generator G having an internal impedance Zi is connected to the which form part of two diiierent carrier wave systems and to which the carrier wave produced by the generator Gis to be supplied.
Without interposition of ampliiier A between the generator and modulators M1 and M2, a coupling would be set up across the internal impedance Zi The same would apply if an amplifier without degenerative backcoupling were used, because the internal resistance of the amplifying tube would act as a coupling impedance.
According to the invention ampliier A is backcoupled in a degenerative manner. As shown the amplifier comprises a thermionic tube 5 having a grid 9, a plate lll, and an incandescible cathode ll, supplied with heating current by a battery I6. Plate I il is connected through a condenser l to one end of the primary winding l2 of a coupling transformer 3; the other end of this winding being connected to the cathode Connected between plate l and cathode ll is a resistance 6 and a source of plate voltage l5. Winding I2 is a potentiometer whereby the coupling between the two carrier wave systems will be materially reduced.
I have found that degenerative back-coupling involves variation of the internal resistance of the amplifying tube. For example, if tube Without back-coupling has an internal resistance R11 and an amplifying factor g, the internal resistance of the amplifying tube with degenerative back-coupling may be represented by the Iormula:
the electric circuits connected to the output circuit of the amplier. For instance, if R1=5,000 ohms, 9:25, and ,6:20, then Rif will be equal to i0 ohms.
The coupling between the load circuits is further decreased by inserting resistances R. in the output circuit as permissible in view of What I claim is: 1. A
the prior art.
reducing the coupling between said electric circuits comprising a degenerative back-coupled amplifier connected be- ,55
and comprising an amplifying tube having an 10 anode, a' cathode and a grid, a plate circuit for said tube insulating a coupling transformer having a primary winding and a secondary Winding connected to said loads, a potentiometer connected across said primary Winding, and a grid circuit for said tube including said generator and a portion of said potentiometer, said portions being so selected that the amplifying tube vhas a low internal resistance.
THOMAS SAMUEL SKILLMAN.
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Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEN40074D DE744885C (en) | 1936-11-24 | 1936-11-24 | Circuit to avoid coupling in carrier wave telephony or telegraphy |
Publications (1)
Publication Number | Publication Date |
---|---|
US2210956A true US2210956A (en) | 1940-08-13 |
Family
ID=5764680
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US17598337 Expired - Lifetime US2210956A (en) | 1936-11-24 | 1937-11-22 | Coupling circuit |
Country Status (7)
Country | Link |
---|---|
US (1) | US2210956A (en) |
BE (1) | BE424748A (en) |
CH (1) | CH201131A (en) |
DE (1) | DE744885C (en) |
FR (1) | FR829619A (en) |
GB (1) | GB486286A (en) |
NL (1) | NL85156B (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2563245A (en) * | 1944-05-12 | 1951-08-07 | Cossor Ltd A C | Voltage combining circuits |
US2598259A (en) * | 1948-09-04 | 1952-05-27 | Ephraim W Hogue | Signal amplifying system |
US3100282A (en) * | 1958-10-29 | 1963-08-06 | Beckman Instruments Inc | Shielding amplifier circuit |
-
0
- NL NL85156D patent/NL85156B/xx unknown
-
1936
- 1936-11-24 DE DEN40074D patent/DE744885C/en not_active Expired
-
1937
- 1937-11-18 CH CH201131D patent/CH201131A/en unknown
- 1937-11-20 BE BE424748D patent/BE424748A/xx unknown
- 1937-11-20 GB GB3200137A patent/GB486286A/en not_active Expired
- 1937-11-22 US US17598337 patent/US2210956A/en not_active Expired - Lifetime
- 1937-11-22 FR FR829619D patent/FR829619A/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2563245A (en) * | 1944-05-12 | 1951-08-07 | Cossor Ltd A C | Voltage combining circuits |
US2598259A (en) * | 1948-09-04 | 1952-05-27 | Ephraim W Hogue | Signal amplifying system |
US3100282A (en) * | 1958-10-29 | 1963-08-06 | Beckman Instruments Inc | Shielding amplifier circuit |
Also Published As
Publication number | Publication date |
---|---|
BE424748A (en) | 1937-12-31 |
CH201131A (en) | 1938-11-15 |
FR829619A (en) | 1938-07-01 |
NL85156B (en) | 1900-01-01 |
GB486286A (en) | 1938-06-01 |
DE744885C (en) | 1944-01-28 |
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