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US1792274A - Amplifying system - Google Patents

Amplifying system Download PDF

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Publication number
US1792274A
US1792274A US164341A US16434127A US1792274A US 1792274 A US1792274 A US 1792274A US 164341 A US164341 A US 164341A US 16434127 A US16434127 A US 16434127A US 1792274 A US1792274 A US 1792274A
Authority
US
United States
Prior art keywords
coupling
devices
circuits
output circuit
input
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
Application number
US164341A
Other languages
English (en)
Inventor
Wendell L Carlson
Ralph S Holmes
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
General Electric Co
Original Assignee
General Electric Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority to FR649433D priority Critical patent/FR649433A/fr
Priority to NL26272D priority patent/NL26272C/xx
Application filed by General Electric Co filed Critical General Electric Co
Priority to US164341A priority patent/US1792274A/en
Priority to GB2906/28A priority patent/GB284587A/en
Application granted granted Critical
Publication of US1792274A publication Critical patent/US1792274A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J3/00—Continuous tuning
    • H03J3/02—Details
    • H03J3/06—Arrangements for obtaining constant bandwidth or gain throughout tuning range or ranges
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/01—Frequency selective two-port networks
    • H03H7/0153—Electrical filters; Controlling thereof
    • H03H7/0161—Bandpass filters

Definitions

  • Our invention relates to systems wherein electrical impulses are amplified through means comprising a plurality of interconnected space discharge devices, such as thermionic amplifiers or the like, and has for its rincipal object the provision of an ampliying system which may be operated over a wide range of frequencies with a uniformly high de cc of selectivity and with uniform ampli cation.
  • Figs. 1 to 3 1llustrate amplifying systems wherein our invention has been embodied; and Fig. 4 shows a plurality of curves relating to t e operation. of these systems.
  • Fig. 1 illustrates an amplifying system comprising spacedischarge devices 1 and 2 each provided with a cathode 3, an anode 4, a control grid 5, and a screen grid 6 which is arranged to practically eliminate the capacitative coupling between the control'grid 5 and the anode 4.
  • Suitable sources of 0- tential, such as batteries 7, are provided or maintaining the screen grids 6 at predetermined potentials with respect to the cathodes 3 and like sources 8 are connected in the input circuits of the devices 1 and for biasing the control grids 5 to potentlals whlch ensure proper operation of these devlces.
  • Terminals 9 and 10 are provided for connecting the input circuit of the device 1 to the source of the electrical impulses which are to be am lified. Current is supplied to the output circuits of the devices 1 and 2 from sources 11 and 12.
  • the output circuit of the device 1 is coupled to the input circuit of the device 2 through a capacitative coupling 13 and an inductive coupling 14 which are preferably 180 out of phase with one another; that an inductance 15 and a capacity 16 are provided for tuning the output circuit of the device 1; and that an inductance 17 and a capacity 18 are provided for tuning the input circult of the device 2.
  • the capacitive coupling is provided between the high potential ends of said tuned circuits and the inductive couplin is provided at the low potential ends.
  • the inductive couplin is provided at the low potential ends.
  • 'lhe inductive coupling predominates and is opposed increasingly with frequency .by the capacitive coupling which increases at a higher rate as will be seen hereinafter.
  • the advantages of this combination of capacitative and inductive coupling between two tuned circuits will be readily understood upon consideration of Fig. 4.
  • Such tuned circuits may not necessarily be provided between two electric discharge devices but may be any tuned circuits coupled in the same manner and for the same purpose.
  • Fig. 4 shows a curve a which indicates the effect of change in frequency on the amplitica tion ratio from the input of tube 1 to the input of tube 2 when only the magnetic or inductive coupling 14 is used.
  • Curve 5 shows the relation between frequency and the amplification ratio when only the capacitative coupling 13 is used.
  • Curve 0 is the resultant of curves a and b. This resultant curve indicates the effect of change in frequency on the amplification ratio when both the capacitative coupling 13 and the -inductive coupling 14 are used with the capacity coupling 180 out of phase with the magnetic coupling.
  • both couplings increase with frequency, and that the amplification ratio is substantially constant over a considerable range of frequencies and that the coupling tends to be lower at the higher frequency end of the range.
  • the tuning of both the output circuit of the device 1 and the input circuit of the device 2 to the frequency of the impulses to be amplified has the marked advantage that only impulses having a frequency within the range of substantially uniform amplification are selected.
  • the screen grid tube possesses a very high impedance and accordingly it is possible to utilize a high impedance output circuit.
  • the screen grid prevents coupling between the input and output circuits. This is advantageous because the tuning of the output circuit and the use of the compound coupling ed to the coil 15 and the coupling :3 ⁇ , e. povided for neutralizing the capacitativc coupling between the control grid 5 and the anode l oi the device 1.
  • Fig. 3 illustrates an. ampliryi system which differs from that of Fig. .1. only in that the neutralizing condenser and coil control grid 4. It will be apparent tha any I us other than those iilusrrated ..o 3 may be pmvided for neutrab icin t" capacitative coupling between the control grid 5 and the anode a; and that the advantages of the compound capacitutive and inductive coupling between the two tuned circuits are not limited to the particular systems illustrated.
  • a pair of space discharge devices comprising input and output circuits, means for tuning the output circuit of one of said devices and the inputcircuit of the other of said devices to the same frequency, and said circuits being capacitively and inductively coupled, the inductive coupling predominating and being in opposition to the capacitive coupling.
  • an interstage coupling means therefor providing capacitive and inductive coupling between said stages, the capacitive no coupling being substantially 180 out of phase with the inductive coupling and both eing adjusted so that the amplification ratio is rendered substantially uniform over a relatively wide range of frequencies, said adjustment being such that the inductive cou-. pling predominates and that the capacitive iii an input iprisin :1 cathode and control grid 'rc it" a cathftlll coupling increases more rapidly with frewcam substantially constant over a relatively wide range of fre uencies.
  • a coup ing means for interconnected high frequency circuits said means including an input circuit and an output circuit, means for tuning said circuits to the same frequency, said circuits being inductively coupled at their low potentiai ends, and being capacitively coupled at their high potential ends in opposing phase relation to said inductive coupling.
  • said inductive and capacitive couplings both being arranged to increase with frequency, and said capacitive coupling being arranged to increase with fre uency more rapidly than said inductive coup ing.

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  • Amplifiers (AREA)
  • Soil Working Implements (AREA)
US164341A 1927-01-28 1927-01-28 Amplifying system Expired - Lifetime US1792274A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
FR649433D FR649433A (xx) 1927-01-28
NL26272D NL26272C (xx) 1927-01-28
US164341A US1792274A (en) 1927-01-28 1927-01-28 Amplifying system
GB2906/28A GB284587A (en) 1927-01-28 1928-01-30 Improvements in thermionic valve amplifying systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US164341A US1792274A (en) 1927-01-28 1927-01-28 Amplifying system

Publications (1)

Publication Number Publication Date
US1792274A true US1792274A (en) 1931-02-10

Family

ID=22594051

Family Applications (1)

Application Number Title Priority Date Filing Date
US164341A Expired - Lifetime US1792274A (en) 1927-01-28 1927-01-28 Amplifying system

Country Status (4)

Country Link
US (1) US1792274A (xx)
FR (1) FR649433A (xx)
GB (1) GB284587A (xx)
NL (1) NL26272C (xx)

Also Published As

Publication number Publication date
NL26272C (xx)
FR649433A (xx) 1928-12-21
GB284587A (en) 1928-06-07

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