US1907225A - Resistance coupled amplifiers - Google Patents

Resistance coupled amplifiers Download PDF

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Publication number
US1907225A
US1907225A US423006A US42300630A US1907225A US 1907225 A US1907225 A US 1907225A US 423006 A US423006 A US 423006A US 42300630 A US42300630 A US 42300630A US 1907225 A US1907225 A US 1907225A
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United States
Prior art keywords
anode
common
coupling
impedance
resistor
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Expired - Lifetime
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US423006A
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English (en)
Inventor
Pol Balthasar Van Der
Mark Jan Van Der
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RCA Corp
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RCA Corp
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    • 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

Definitions

  • the present invention relates to amplifiers, and more particularly to improvements in, or relating to, low frequency resistance Coupled amplifiers. y
  • the amplification is not perfectly uniform for the whole range of frequencies to be amplified. Even if the utmost care is bestowed on the construction, it is not always possible to eliminate this non-uniformity. In many cases, however, it is desirable to obtain a perfectly uniform amplification of the whole low frequency range.
  • the invention has, then, for its main object the provision of a means for achieving this result.
  • Another important object of the invention is to provide an amplifier so constructed that the anode circuits of at least two valves, whose ordinal numbers in the cascade connection differ by an odd number, comprise a common resistance or impedance.
  • Still another object of the invention is to provide an amplifier circuit arrangement comprising an even number of amplification stages, all the anode circuits in which have a common portion.
  • Fig. 1 diagrammatically shows a fourstage amplifier in which the anode circuits of the first and last thermionic devices comprise a common impedance
  • Fig. 2 shows a modified form of circuit in which alll the anode circuits comprise a common impedance.
  • thermionic devices are denotedby 1, 2, 3 and 4, and the coupling condensers by, Gand 7.
  • the filaments and anodes of the tubes are energized by current sources 8 and 9 respectively.
  • Theresistances 11 and 12 are directly connected by the'lead 15 to the positive pole of the anode current source 9, whereas the resistances 10 and 13 are both connected to the said pole through a resistance or impedance 14.
  • Y resistance or impedance
  • Fig.'2 diers from Fig. 1 only in that the resistances orimpedances ,11 and 12, instead of being directly connected to the positive terminal of the anode battery areconnected thereto through the impedance'14. It has been found that the use of this common 'impdance results ina perfectly uniform amplilication of a very broadrange of frequencies.
  • the impedance 14C need not have -a high value.l
  • resistance 141 was given a value Vof 1000 ohms, whereas the resistances 10, l1, 12 and 13 had values' of about 200,000 ohms. After the resistance 14 had been provided the characteristic, which without impedance 14 showed great irregularities, was found to be almost perfectly jstraight up to about 15,000 cycles per second. A suitable choice of the impedance 14 results in a more or less powerful amplification, over definite frequency ranges, and to thus alter somewhat the shape of the frequency characteristic. Y
  • a resistance coupled audio frequency amplifier in a resistance coupled audio frequency amplifier, a plurality of amplifier tubes in cascade, a source of anode potential, a capacitybetween the anode of each preceding tube and the grid of each succeeding tube, a common lead between the positive terminal of said source and each of the tube anodes, a coupling resistor between each anode and the common lead, a common impedance, in series with each coupling resistor, being disposed in said common lead between said couplingV resistors and said positive terminal to secure perfectly uniform audio amplification over the whole range of audio frequencies up to 15,000 cycles, said impedance having a resistive magnitude of the order of one-two hundredth of said coupling resistors.
  • a plurality of amplifier tubes in cascade a source of anode potential, a capacity between the anode of each preceding tube and the grid of each succeeding tube, a commonlead between the positive terminal o f said source and each of the tube anodes, a coupling resistor between each anode and the common lead, a common resistor, in series with each coupling resistor, being disposed in said' common lead between said coupling resistors and said positive terminal to secure uniform audio amplification upV to 15,000 cycles, the'magnitude of said common resistor being of the order of one-two hundredth of the magnitude of any of said coupling resistors.
  • each of said coupling resistors having a value at least two hundred times greater than said common resistor whereby perfectly uniform amplification of the whole audio frequency range up to substantially 15,000 cycles is secured.
  • a plurality of amplifier tubes in cascade a source of anode potential, a capacity between the anode of each preceding tube and the grid of each succeeding tube, a common lead between the positive terminal ofthe source and the anodes of the first and last tubes, a common lead between said terminal and the anodes of at least two intermediate tubes, a coupling resistor between each anode and its common lead, and a common impedance of a magnitude one-two hundredth of any coupling resistor between the last coupling resistor and said terminal.
  • a source of anode potential having a value of the order yof 200,000 ohms between each anode and the common lead, a common impedance having a value about one-two hundredth of said first mentioned value in series with each coupling resistor, being disposed in said common lead between said coupling resistors and said positive terminal to secure uniform audio amplification up to 15,000 cycles, and a capacity in shunt-with said common impedance to accentuate the amplification of the higher audio frequencies.
  • l 4 In combination, in a resistance coupled audio frequency amplifier, a plurality of amplifier tubes in cascade, a source of anode p-otential, a capacity between the anode of each preceding tube and the grid of each succeedingtube, .a coupling resistor between each anode and the positive terminal of said source, and a common resistor between the last coupling resistor and said positive terminal, said common resistor being conduc-

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)
US423006A 1929-02-15 1930-01-24 Resistance coupled amplifiers Expired - Lifetime US1907225A (en)

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NL1907225X 1929-02-15

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US1907225A true US1907225A (en) 1933-05-02

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US (1) US1907225A (enrdf_load_html_response)
FR (1) FR687811A (enrdf_load_html_response)
NL (1) NL37563C (enrdf_load_html_response)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2521878A (en) * 1945-07-09 1950-09-12 Merle A Starr Sector scan circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2521878A (en) * 1945-07-09 1950-09-12 Merle A Starr Sector scan circuit

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Publication number Publication date
FR687811A (fr) 1930-08-13
NL37563C (enrdf_load_html_response)

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