US2582726A - Mixing circuit arrangement - Google Patents

Mixing circuit arrangement Download PDF

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Publication number
US2582726A
US2582726A US680930A US68093046A US2582726A US 2582726 A US2582726 A US 2582726A US 680930 A US680930 A US 680930A US 68093046 A US68093046 A US 68093046A US 2582726 A US2582726 A US 2582726A
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United States
Prior art keywords
circuit
mixing
impedance
oscillations
lecher
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Expired - Lifetime
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US680930A
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English (en)
Inventor
Adelbert Van Weel
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Hartford National Bank and Trust Co
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Hartford National Bank and Trust Co
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Publication date
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D7/00—Transference of modulation from one carrier to another, e.g. frequency-changing
    • H03D7/14—Balanced arrangements
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D7/00—Transference of modulation from one carrier to another, e.g. frequency-changing
    • H03D7/14—Balanced arrangements
    • H03D7/1408—Balanced arrangements with diodes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B15/00—Suppression or limitation of noise or interference
    • H04B15/02—Reducing interference from electric apparatus by means located at or near the interfering apparatus
    • H04B15/04—Reducing interference from electric apparatus by means located at or near the interfering apparatus the interference being caused by substantially sinusoidal oscillations, e.g. in a receiver or in a tape-recorder
    • H04B15/06—Reducing interference from electric apparatus by means located at or near the interfering apparatus the interference being caused by substantially sinusoidal oscillations, e.g. in a receiver or in a tape-recorder by local oscillators of receivers

Definitions

  • This invention relates to amixing circuit which is particularly suitable for short waves and in which the incoming oscillations are supplied in push-pull and the local oscillations in single phase arrangement to the input electrodes of two discharge systems (mixing systems). In the transmission of ultra-high frequencies this receiving method has the advantage of yielding a low input damping and a better signal-to-noise ratio.
  • a circuit of this kind exhibits the drawback, however, that the inputimpedance of the mixing systems, more particularly in receiving ultrashort waves, has only a small value, due to which the voltage having the frequency of the local oscillations and being set up between the input electrodes of each of these systems usually becomes too low.
  • the (single-phase) circuit which is constituted by the impedances, pairwise connected in parallel, of the two halves of the push-pull circuit and the parallel-connected input impedances of the two discharge systems, jointly with the impedances common to the input circuits of the two systems is, ac cording to the invention, tuned to the frequency of the local oscillations.
  • the expression push-pull circuit is to be understood to mean the assembly of impedances available between two not directly interconnected input electrodes of the discharge systems, in which are flowing currents having the frequency of the incoming oscillations
  • the expression input circuit of a discharge system being understood to mean all the impedances available between the input electrodes of a discharge system and in which are circulat- 3 Claims. (01. 25c 20) ing currents associated with this system and having the frequency of the local oscillations.
  • Fig. 1 represents a mixing circuit which forms part of a superheterodyne receiver for short waves, in which the local oscillations are supplied in single-phase and the incoming oscillations are fed in push-pull connection to the mixing systems I, I" through a tunable lecher-system.
  • the oscillations captured by a dipole antenna 2', 2" are supplied to two conductors 3, 3" forming part of the said lecher-system, which by means of a short-circuit bridge 4 is tuned to I the mixing systems.
  • the antenna 2, 2" is connected to the lecher-system 3', 3" in such a manner as to ensure optimum matching of the antenna to The expression optimum matching is to be understood an adaptation by which either a maximum signal-to-noise ratio or maximum amplification is obtained.
  • the incoming oscillations are supplied through the lecher-system in push-pull, whereas thelocal oscillations are fed, by means of so-called cathode-injection, in single-phase (in the same phase) tothe input electrodes of the two diodes I, l'-.'
  • this difficulty is solved by tuning the single-phase circuit, which in the case under view is constituted by the parallel-connected input impedances of the two discharge systems (indicated -in the drawing by the capacities 5', 5"), the pairwise parallelconnected impedances of the two halves of the push-pull circuit (in the present case the conductors 3', 3"), jointly with the impedances common to the input circuits of-both systems (in the present case the impedance of the conductors 3', 3" with respect to thesurroundings as well as the impedance ofthe local oscillator O),
  • Fig 2 represents an embodiment of the invention in which this tuning can be realized in a simple manner.
  • the lecher wires 3', 3" are lengthened by parts 6, 6" and the ends are connectedby an earthed short-circuit bridge I, the extension'bein given such a value (which may be effected by adjustmentof the short-circuit bridge I) that the single-phase cir-- cult is tuned to the frequency of the local 'oscillations.
  • the extension'bein given such a value (which may be effected by adjustmentof the short-circuit bridge I) that the single-phase cir-- cult is tuned to the frequency of the local 'oscillations.
  • an impedance preferably a variable impedance
  • the desired resonance can be achieved by adjusting this impedance to a suitable value.
  • Fig. 3 represents an embodimentof the 'inventionin which this is reduced to practice, the lecher system 3, 3", 6', 6" being surrounded at the same time by shielding means. 8 of. which the end 9 remote from the mixing systems I,
  • bridge I of the extended lecher-system is not connected directly to earth but through the intermediary of a variable condenser In, this condenser being so adjusted as to establish the. de-. sired resonance.
  • Fig.4 represents'an embodiment of the invenncessary to lengthen thev two lecher wires.
  • the locationwhere the-incoming oscillations are supplied to thepush-pull circuit in the present case the junction of the-antenna and the lecher-system 3", 3""
  • the locationwhere the-incoming oscillations are supplied to thepush-pull circuit in the present case the junction of the-antenna and the lecher-system 3", 3"
  • the locationwhere the-incoming oscillations are supplied to thepush-pull circuit in the present case the junction of the-antenna and the lecher-system 3", 3"
  • the locationwhere the-incoming oscillations are supplied to thepush-pull circuit in the present case the junction of the-antenna and the lecher-system 3", 3"
  • the aforesaid resonance can be'estabimpedances" constituting the single-phase circuit" in a suitable manner with respect to the antenna junctions- ⁇ radiation of'the local oscillations" by theantenna L can be entirely or substantially entirely avoided in-a-ll cases;
  • H animpedance l2 which is preferably'alsovariable, being connected'between the mixing' systems I, l" and earth, in serieswith the local oscillator 0; if desired; these'imp'ances'may consist of lecher systems;
  • the right halfof' the single-phase circuit reckoned from the antenna junctions to earth, is tuned to the frequency'of In regard to the left half of: the singl'e phase circuit; also reckoned from the local oscillations.
  • the same can be achieved by adjustment of the impedance l2.
  • the whole of the single-phase circuit is tuned to the frequencyof 'the local oscillations and, moreover, the antenna exhibits a minimum potential difierence (of the frequency of. the local oscillations) with respect to the surroundings and so radiates the local oscillations as little as possible and not at all when making use of no-loss impedances.
  • mixing systems use may be made not only of diodes, but'also of triodes, tetrodes and so on.
  • the two mixing systems may often be jointly incorporated in one discharge tube and, as the case may be, have one cathode in common.
  • An electrical circuit arrangement for mixing a first wave and asecond wave comprising the following elements in series circuit arrange-' ment andin the order named, a first impedance element.
  • first and second mixing elements arranged in' parallel relationship, a second impedance element having distributed electrical con'stantsand being" coupled in push pull rela-- tionship to said mixing elements and a third impedance element, means coupled in series with said" impedance elements to apply said first wave in the same phasetosaidmixing elements,
  • An electrical circuit arrangement for mixing'a' first waveand a second wave comprising'the following elements in series circuit arrangement and-in the-order named; a first im' pedance element, first and" second mixing elements arranged in" parallel relationship; a .sec-
  • said circuit means; said; first impedance element, said mixing elementsandthe portion of said secondimpedance element between-said mixing elements and said 'first*pointforming a first series circuit, the" remainder of said second impedance element and said" third impedance element forminga second series circuit, said firstand' third impedance elements being" adjustable relative 'toeach other to tune each of said first and second series circuits to thefrequency' of said first-waveand to provide at said second, impedance-element a second point which is a potential node for said' first wave substantially coincident tosaid first point.
  • An -electrica'l circuitarrangement for mix inga first-waveand a second wave comprising the following elements in series circuit arrangeintent and in the order named, a first impedance element, first and second mixing elements arranged in parallel relationship, a lecher-system having one end thereof coupled to said mixing elements in push-pull relationship and having a short-circuiting member for tuning said coupled end to the frequency of said second wave and a second impedance element, circuit means coupled in series with said impedance elements to apply said first wave to said mixing elements, and means coupled to said lecher-system at a point of optimum matching thereon to apply said second wave to said mixing elements, said circuit means, said first impedance element, said mixing elements and the portion of said lechersystem between said mixing elements and said point of optimum matching forming a first series circuit, the remainder of said lecher-system and said second impedance element forming a second series circuit, said first and second impedance elements being adjustable relative to each other to tune each of said first and second series circuit,

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Superheterodyne Receivers (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
US680930A 1943-03-27 1946-07-02 Mixing circuit arrangement Expired - Lifetime US2582726A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL2582726X 1943-03-27
NL620271X 1943-11-12

Publications (1)

Publication Number Publication Date
US2582726A true US2582726A (en) 1952-01-15

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ID=32232801

Family Applications (1)

Application Number Title Priority Date Filing Date
US680930A Expired - Lifetime US2582726A (en) 1943-03-27 1946-07-02 Mixing circuit arrangement

Country Status (5)

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US (1) US2582726A (en(2012))
BE (2) BE455016A (en(2012))
FR (2) FR903030A (en(2012))
GB (1) GB620271A (en(2012))
NL (1) NL65632C (en(2012))

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2712062A (en) * 1949-04-12 1955-06-28 Rca Corp Converter circuits
US2835873A (en) * 1954-12-27 1958-05-20 Collins Radio Co Filter

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1980158A (en) * 1931-05-01 1934-11-06 Rca Corp Oscillatory circuit
US2106776A (en) * 1935-02-23 1938-02-01 Rca Corp Receiving system
US2211003A (en) * 1938-01-29 1940-08-13 Rca Corp Radio signaling system
US2260844A (en) * 1940-03-12 1941-10-28 Gen Electric Ultra high frequency converter
US2307074A (en) * 1938-09-22 1943-01-05 George E Pray Modulating circuit for high frequencies
US2326801A (en) * 1938-09-22 1943-08-17 George E Pray High frequency tubes and circuits
US2382693A (en) * 1940-02-24 1945-08-14 Dallenbach Walter Oscillator-modulator circuit
US2427241A (en) * 1941-05-19 1947-09-09 Hartford Nat Bank & Trust Co Push-pull circuit arrangement for ultra-short waves
US2479537A (en) * 1942-12-30 1949-08-16 Gen Electric Detector-oscillator circuit for ultra high frequency receivers

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1980158A (en) * 1931-05-01 1934-11-06 Rca Corp Oscillatory circuit
US2106776A (en) * 1935-02-23 1938-02-01 Rca Corp Receiving system
US2211003A (en) * 1938-01-29 1940-08-13 Rca Corp Radio signaling system
US2307074A (en) * 1938-09-22 1943-01-05 George E Pray Modulating circuit for high frequencies
US2326801A (en) * 1938-09-22 1943-08-17 George E Pray High frequency tubes and circuits
US2382693A (en) * 1940-02-24 1945-08-14 Dallenbach Walter Oscillator-modulator circuit
US2260844A (en) * 1940-03-12 1941-10-28 Gen Electric Ultra high frequency converter
US2427241A (en) * 1941-05-19 1947-09-09 Hartford Nat Bank & Trust Co Push-pull circuit arrangement for ultra-short waves
US2479537A (en) * 1942-12-30 1949-08-16 Gen Electric Detector-oscillator circuit for ultra high frequency receivers

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2712062A (en) * 1949-04-12 1955-06-28 Rca Corp Converter circuits
US2835873A (en) * 1954-12-27 1958-05-20 Collins Radio Co Filter

Also Published As

Publication number Publication date
FR54440E (fr) 1950-05-02
BE455016A (en(2012)) 1944-04-29
GB620271A (en) 1949-03-22
FR903030A (fr) 1945-09-21
NL65632C (en(2012)) 1950-05-15
BE457989A (en(2012)) 1945-06-27

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