US1771913A - Amplifying system - Google Patents

Amplifying system Download PDF

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Publication number
US1771913A
US1771913A US268356A US26835628A US1771913A US 1771913 A US1771913 A US 1771913A US 268356 A US268356 A US 268356A US 26835628 A US26835628 A US 26835628A US 1771913 A US1771913 A US 1771913A
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US
United States
Prior art keywords
circuit
coupling
over
turns
transformer
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
US268356A
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English (en)
Inventor
Bradbury Burke
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 NL29678D priority Critical patent/NL29678C/xx
Application filed by General Electric Co filed Critical General Electric Co
Priority to US268356A priority patent/US1771913A/en
Priority to GB10645/29A priority patent/GB309187A/en
Application granted granted Critical
Publication of US1771913A publication Critical patent/US1771913A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F19/00—Fixed transformers or mutual inductances of the signal type
    • H01F19/04—Transformers or mutual inductances suitable for handling frequencies considerably beyond the audio range
    • 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

Definitions

  • the present invention relates to amplifying systems, and more particularly to systems employing electron discharge apparatus for the amplification of high frequency currents.
  • the impedance of the tuned output circuit will vary considerably over the range of frequenci s be used and hence uniform amplification cannot be obtained over the entire frequency range.
  • I11 carrying my invention into effect I provide tuned input circuits for one or more electron discharge amplifiers and closely couple these tuned input circuits by transfomers to the untuned output circuits of the preceding four electrode screen grid electron discharge devices.
  • transformers may to advantage have a one to one ratio of turns, or may even have a greater number of turns in the primary winding than in the secondary. Vith this expedient the effective impedance of the output circuit of th four-electrode device maybe made substantially as high or even higher than would be the case if the output circuit itself were tuned.
  • the effective impedance of the output circuit may be made somewhat higher than if the ratio were held at one to one and this may in some cases appreciably increase he degree of amplification obtained as the plate impedan e of the four-element tube is ordinarily considerably higher than the im pedance at resonance of a well designed parallel tuned circuit and it is well known that for the maximum degree of annalification the output.
  • impedance of the circuit should be substantially equal to the tube impedance.
  • the selectivity may still further be improved, with uniform ainplitude of amplification, by reversing the polarity of one winding with respect to the other, as for example, by winding one coil in the opposite direction from the other.
  • adjacent ends of t 1e two winding should be at the same potential with respect to ground, high or low, as the case may be.
  • the natural capacity coupling is in opposite phase to the magnetic coupling of the coils and the spacing between them must be somewhat greater than when wound in the same direction to prevent the two sources of coupling from bucking each other to nearly zero effective coupling at the high frequency end of the range.
  • the greater spacing reduces the capacity coupling so that the mag tic cou pling predominates by an amount .itlicient to produce a substantial degree of amplifiestion at an amplitude which remains practical.- ly constant over the entire operating ran Improvement in selectivity is obtained in t iis case by reason of the greater separation of the windings.
  • Fig. 1 receiving system comprising a screen grid radio frequency amplifier device 1, a regenerative detector 2, and two audio frequency amplifying devices 3 and 4:.
  • Si naling currents received upon the antenna a are impressed by means of the coupling transformer 6 upon the tuned input circuit 7 of device 1.
  • the output circuit of device 1 is coupled by means of the coupling transformer 9 through the tuned input circuit 10 of the regenerative detector 2.
  • the output of the circuit of the detector is coupled by means of the transformer 11 to the input circuit of the audio amplifier 3.
  • Conpling transformer 9 is constructed in accordance with the principles which I have de scribed above so as to give a substantially uniform degree of amplification over the entire range over which the receiving set is intended to operate.
  • the various screen grid devices and circuits are enclosed in grouna'led shields as indicated, or separator by grounded shields, as shown by dotted lines in the two figures of the drawing.
  • the d sired operating potential for screening grids 18 is provided by means of suitable source connected terminals 19 and 20.
  • potentiometer arrangement 21 By controlling this potential by means of potentiometer arrangement 21, a convenient and satisfactory volume control of the degree of amplifi-ation provided. This, however, is not a part or my present invention, but is described and claimed in a pending application of C. ill. Burrill, and assigned to the same assignee as the present application.
  • volume control is accompl' red by means of the v: riablc resistance 22 winch is inserted in the cathode circuit of amplifier 1.
  • the combination in an amplifying sys tem adapted to operate over a predetermined rane of radio frequencies of plurality of eleccron discharge devices having tunable input circuits and a coupling transformer connect ng the output circuit of one device to the input circuit of another device, said transformer having substantially great a number of primary turns as secondary turns, the primary turns being closely coupled electrognetically to the secondary turns and the polarity of the secondary winding being reversed with respect to that of the primary winding, and the primary and secondary turns being separated to such an extent by an ir e muing dielec -c that the combined electroma and electro tatic couplings serve to produce substantially uniform voltage amplification over the entire frequency over which the system is adapted to operate.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Multimedia (AREA)
  • Amplifiers (AREA)
US268356A 1928-04-07 1928-04-07 Amplifying system Expired - Lifetime US1771913A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
NL29678D NL29678C (enrdf_load_stackoverflow) 1928-04-07
US268356A US1771913A (en) 1928-04-07 1928-04-07 Amplifying system
GB10645/29A GB309187A (en) 1928-04-07 1929-04-05 Improvements in and relating to thermionic or like amplifying systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US268356A US1771913A (en) 1928-04-07 1928-04-07 Amplifying system

Publications (1)

Publication Number Publication Date
US1771913A true US1771913A (en) 1930-07-29

Family

ID=23022612

Family Applications (1)

Application Number Title Priority Date Filing Date
US268356A Expired - Lifetime US1771913A (en) 1928-04-07 1928-04-07 Amplifying system

Country Status (3)

Country Link
US (1) US1771913A (enrdf_load_stackoverflow)
GB (1) GB309187A (enrdf_load_stackoverflow)
NL (1) NL29678C (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3835399A (en) * 1972-01-24 1974-09-10 R Holmes Adjustable electronic tunable filter with simulated inductor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3835399A (en) * 1972-01-24 1974-09-10 R Holmes Adjustable electronic tunable filter with simulated inductor

Also Published As

Publication number Publication date
NL29678C (enrdf_load_stackoverflow)
GB309187A (en) 1930-10-06

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