US1990781A - Resistance-capacitance coupled amplifier - Google Patents

Resistance-capacitance coupled amplifier Download PDF

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Publication number
US1990781A
US1990781A US608022A US60802232A US1990781A US 1990781 A US1990781 A US 1990781A US 608022 A US608022 A US 608022A US 60802232 A US60802232 A US 60802232A US 1990781 A US1990781 A US 1990781A
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US
United States
Prior art keywords
capacitor
frequencies
resistor
inductor
audio
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
US608022A
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English (en)
Inventor
William A Fitch
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
Application filed by General Electric Co filed Critical General Electric Co
Priority to US608021A priority Critical patent/US1941345A/en
Priority to US608022A priority patent/US1990781A/en
Priority to US659199A priority patent/US1930339A/en
Priority to DEI47031D priority patent/DE629207C/de
Priority to GB12070/33A priority patent/GB397076A/en
Priority to NL65119A priority patent/NL39142C/xx
Priority to FR754811D priority patent/FR754811A/fr
Priority to FR44573D priority patent/FR44573E/fr
Priority to GB6591/34A priority patent/GB419914A/en
Application granted granted Critical
Publication of US1990781A publication Critical patent/US1990781A/en
Priority to US328045A priority patent/US2270764A/en
Priority to GB4542/41A priority patent/GB545827A/en
Priority to FR51771D priority patent/FR51771E/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H03F1/34—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
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/42—Modifications of amplifiers to extend the bandwidth
    • H03F1/48—Modifications of amplifiers to extend the bandwidth of aperiodic amplifiers
    • H03F1/50—Modifications of amplifiers to extend the bandwidth of aperiodic amplifiers with tubes only

Definitions

  • My invention relates to amplifiers and more particularly to impedance or resistance coupled amplifiers for use over a wide range of audible and super-audible frequencies.
  • I provide a resistance-capacitance coupled amplifier with resistor and capacitor means in series with the coupling capacitor for obtaining substantially constant amplification throughout a wide range of audio and radio frequencies.
  • an inductor may also be arranged in parallel with the resistor and capacitor means and connected in series with the normal coupling capacitor for neutralizing the phase shift introduced by the coupling capacitor.
  • FIG. 1 illustrates an impedance coupled amplifier having a substantially fiat amplification characteristic for a range extending from low audio element may be biased negatively by means of a source of potential 2 connected to the cathode and the grid coupling resistor 3.
  • Anode current is supplied to the electron discharge device 1 from a source of potential 4 which is connected to the anode through an anode coupling resistor 5.
  • the anode of the electron discharge device 1 is coupled to the grid of the electron discharge device 6 by means of a coupling capacitor '7
  • the electron discharge device 6 is provided with a grid coupling resistor 8 a source of potential 9 for biasing the grid element.
  • the anode of the electron discharge device 6 is supplied with current from a source. of potential 19 which is connected to the anode through the anode coupling resistor 11.
  • the electron discharge device 6 may be coupled to an output circuit by means of the coupling capacitor 12.
  • a conductor 13 provides a common connection to the cathodes of the electron discharge devices 1 and 6 and to the input and output circuits.
  • resistor 14 is inserted in series with the coupling capacitor '7 to reduce the high amplification of the low audio frequency range.
  • a small by-pass capacitor 15 is connected in parallel with the resistor 14"..
  • he capacitor 7 is of sufficient size so as to offer but a small impedance to the low audio frequencies which pass through this capacitor and through the resistor 14 where they are attenuated.
  • the by-pass capacitor 15 offers a high impedance to the low audio frequencies so that substantially all of the low audio frequencies pass through the resistor 14.
  • the higher frequencies pass through the by-pass capacitor 15 as the by-pass capacitor offers a lower impedance to those frequencies than the resistor 14.
  • the by-pass capacitor l5 begins to pass a certain amount of the audio frequencies and as the upper limit of the radio frequency range is approached, the capacitor carries substantially the entire output of the electron discharge device 1.
  • This arrangement of a resistor and by-pass capacitor in parallel connected in series with the couplingcapacitor then provides an amplifier having a substantially fiat amplification. characteristic for the entire range of frequencies.
  • FIG. 2 I have shown therein an amplifier of the resistance-capacitance coupled type which is similar to that shown in Fig. 1. Like parts in Fig. 2 are given the same reference numerals as in Fig. 1.
  • the coupling capacitor 7 introduces an appreciable phase shift. This phase shift is neutralized by providing an inductor 16 in parallel with the resistor l4 and the. capacitor 15.
  • This inductor 16 is arranged to introduce an inductive reactive component which will compensate for the capacitive reactive component of the coupling capacitor '7 at a frequency approximating the lowest frequency at which. it is desired to a point somewhere near the beginning of the drooping portion of the amplification characteristic.
  • The' inductor 16 is arranged to resonate with the coupling capacitor 7 at a frequency approximating the lowest frequency for which the ameffect.
  • the inductive reactive component introduced by. the inductor 16 exactly neutralizes the phase shift introduced by the .coupling capacitor '7 at the resonant frequency.
  • the capacitive reactive component decreases and the phase shift introduced by the coupling capacitor becomes negligible at high frequencies.
  • the inductivereactive component increases, but the inductor 16 is shunted by the resistor 14 and" the by-pass capacitor 15 which reduce the inductive
  • the signal load is carried by the resistor 14 which also tends to reduce, the normally high amplification or" the lower range of frequencies which may be considered to be audio frequencies.
  • the by-pass capacitor 15 carries the signal load.
  • A. resistance-capacitance coupled amplifier arranged to operateover a wide range-of audio. and radio frequencies, said amplifier having a.
  • acoupling capacitor connected between the anode of :one discharge device and the control element of a succeeding discharge device whereby the voltage supplied to said second discharge device is shifted in phase with respect to the output voltage of said first discharge device, an inductor in series with said coupling capacitor to neutralize said phase shift at substantially the lowest audio frequency to be amplified, means forrendering inappreciable the effect of said inductor throughout the remainder of the audio frequency range,
  • An impedance coupled amplifier arranged pacitor for neutralizing the phase shift of the coupling capacitor at substantially the lowest frequency to'be amplified.
  • a source of audio and radio frequency oscillations including. an electrondischarge device having an anode, a second electron discharge device having a grid circuit and an anode circuit, said grid circuit being arranged to repeat a wide range of audio and radio frequency oscillations from said source to said anode circuit, a coupling capacitor connected to said anode of said first electron discharge device, an inductor in series with said coupling capacitor to neutralize the reactance of said coupling capacitor at" substantially the lowest audio frequencyto be repeated, means in parallel with said inductor for shunting said inductor throughout the remainder'of the audio frequency range, and means in parallel with said inductor for shunting said inductor throughout the radiofrequency range.
  • a resistanceecapacitance coupled amplifier arranged to operate over awide range of audio and radio frequencies including a plurality of electron discharge devices each having a cathode, an anode anda controlelement, a coupling resistor connected between the anode and cathode of the first of said discharge devices, a coupling resistor connected between, the cathode and control element of the second of said discharge de-' vices, a coupling capacitor connected between the anode of one discharge device and the control memberof a succeeding discharge device, said capacitor normally introducing a phase shift between the voltages present across said coupling resistors, and said amplifier normally having a higher amplification characteristic at low frequencies than over the remainder of the operating frequency range, an inductor connected in series with said capacitor for neutralizing said phase shift.
  • a resistor connected in parallel to saidv inductor forreducing the amplification at audio frequencies and for rendering inappreciable the effect of said inductor throughout the higher audio frequency range, and a capacitor connected in parallel with said inductor and resistor for rendering inappreciablethe effect of said in ductor and resistor throughout the remainder of the frequency range.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)
  • Magnetic Resonance Imaging Apparatus (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Secondary Cells (AREA)
US608022A 1932-04-28 1932-04-28 Resistance-capacitance coupled amplifier Expired - Lifetime US1990781A (en)

Priority Applications (12)

Application Number Priority Date Filing Date Title
US608021A US1941345A (en) 1932-04-28 1932-04-28 Resistance-capacitance coupled amplifier
US608022A US1990781A (en) 1932-04-28 1932-04-28 Resistance-capacitance coupled amplifier
US659199A US1930339A (en) 1932-04-28 1933-03-01 Amplifier
DEI47031D DE629207C (de) 1932-04-28 1933-04-21 Anordnung zur Aufhebung des Phaseneinflusses des Kopplungskondensators bei Verstaerkern fuer breite Frequenzbaender
GB12070/33A GB397076A (en) 1932-04-28 1933-04-25 Improvements in and relating to thermionic amplifiers
FR754811D FR754811A (fr) 1932-04-28 1933-04-27 Perfectionnements aux amplificateurs thermioniques
NL65119A NL39142C (enrdf_load_stackoverflow) 1932-04-28 1933-04-27
FR44573D FR44573E (fr) 1932-04-28 1934-03-01 Perfectionnements aux amplificateurs thermioniques
GB6591/34A GB419914A (en) 1932-04-28 1934-03-01 Improvements relating to thermionic amplifiers
US328045A US2270764A (en) 1932-04-28 1940-04-05 Amplifier coupling circuit
GB4542/41A GB545827A (en) 1932-04-28 1941-04-04 Improvements in and relating to amplifier coupling circuits
FR51771D FR51771E (fr) 1932-04-28 1941-08-13 Perfectionnements aux amplificateurs thermioniques

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US608021A US1941345A (en) 1932-04-28 1932-04-28 Resistance-capacitance coupled amplifier
US608022A US1990781A (en) 1932-04-28 1932-04-28 Resistance-capacitance coupled amplifier
US659199A US1930339A (en) 1932-04-28 1933-03-01 Amplifier
US328045A US2270764A (en) 1932-04-28 1940-04-05 Amplifier coupling circuit

Publications (1)

Publication Number Publication Date
US1990781A true US1990781A (en) 1935-02-12

Family

ID=23279265

Family Applications (4)

Application Number Title Priority Date Filing Date
US608022A Expired - Lifetime US1990781A (en) 1932-04-28 1932-04-28 Resistance-capacitance coupled amplifier
US608021A Expired - Lifetime US1941345A (en) 1932-04-28 1932-04-28 Resistance-capacitance coupled amplifier
US659199A Expired - Lifetime US1930339A (en) 1932-04-28 1933-03-01 Amplifier
US328045A Expired - Lifetime US2270764A (en) 1932-04-28 1940-04-05 Amplifier coupling circuit

Family Applications After (3)

Application Number Title Priority Date Filing Date
US608021A Expired - Lifetime US1941345A (en) 1932-04-28 1932-04-28 Resistance-capacitance coupled amplifier
US659199A Expired - Lifetime US1930339A (en) 1932-04-28 1933-03-01 Amplifier
US328045A Expired - Lifetime US2270764A (en) 1932-04-28 1940-04-05 Amplifier coupling circuit

Country Status (5)

Country Link
US (4) US1990781A (enrdf_load_stackoverflow)
DE (1) DE629207C (enrdf_load_stackoverflow)
FR (3) FR754811A (enrdf_load_stackoverflow)
GB (3) GB397076A (enrdf_load_stackoverflow)
NL (1) NL39142C (enrdf_load_stackoverflow)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2419882A (en) * 1944-01-10 1947-04-29 Philco Corp Wide band interstage coupling network
US2625603A (en) * 1950-08-11 1953-01-13 Gen Electric Television pulse separation circuit
US2649508A (en) * 1948-11-12 1953-08-18 Bell Telephone Labor Inc Interstage coupling circuit for wide band amplifiers

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE948424C (de) * 1936-10-12 1956-08-30 Loewe Opta Ag Anordnung zur naturgetreuen Bildwiedergabe, insbesondere fuer Fernseh- oder Messzwecke
US2416977A (en) * 1943-12-31 1947-03-04 Rca Corp Radio frequency wattmeter
US2882351A (en) * 1955-02-03 1959-04-14 Philco Corp Neutralized amplifier circuit
US8284962B2 (en) * 2006-01-09 2012-10-09 Clifford William Latshaw Electronic bass instrument tube preamplifier

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2419882A (en) * 1944-01-10 1947-04-29 Philco Corp Wide band interstage coupling network
US2649508A (en) * 1948-11-12 1953-08-18 Bell Telephone Labor Inc Interstage coupling circuit for wide band amplifiers
US2625603A (en) * 1950-08-11 1953-01-13 Gen Electric Television pulse separation circuit

Also Published As

Publication number Publication date
NL39142C (enrdf_load_stackoverflow) 1936-10-15
FR51771E (fr) 1943-05-03
US1930339A (en) 1933-10-10
FR44573E (fr) 1935-03-04
GB419914A (en) 1934-11-21
DE629207C (de) 1936-04-24
FR754811A (fr) 1933-11-13
GB545827A (en) 1942-06-15
US1941345A (en) 1933-12-26
GB397076A (en) 1933-08-17
US2270764A (en) 1942-01-20

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