US2273619A - Receiver circuits - Google Patents

Receiver circuits Download PDF

Info

Publication number
US2273619A
US2273619A US254562A US25456239A US2273619A US 2273619 A US2273619 A US 2273619A US 254562 A US254562 A US 254562A US 25456239 A US25456239 A US 25456239A US 2273619 A US2273619 A US 2273619A
Authority
US
United States
Prior art keywords
coil
amplifier
circuit
frequency
tube
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
US254562A
Other languages
English (en)
Inventor
Bruck Lothar
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.)
Telefunken AG
Original Assignee
Telefunken AG
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 Telefunken AG filed Critical Telefunken AG
Application granted granted Critical
Publication of US2273619A publication Critical patent/US2273619A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
    • H04B1/1027—Means associated with receiver for limiting or suppressing noise or interference assessing signal quality or detecting noise/interference for the received signal
    • 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
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/189—High-frequency amplifiers, e.g. radio frequency amplifiers

Definitions

  • he alternating potential which is tappedfrom one-of the reactances of the stopper, or filter, circuit isin reverse, or negative, feedback relationship to a part of the amplifier closer to the input end thereof. While it is known in the prior art to attenuate frequencies that are undesirable by reverse feedback established between the output and the inputend, and to insert in such a rereverse feedback. According to the invention,
  • Figs. 1 to 4 show respectively diftating, or shifting, action of the two circuits for certain frequencies. As a consequence, the amplifier would thus start to oscillate at one of these frequencies.
  • Fig. 1 illustrates an embodiment of the invention as applied to the audio amplifier of a receiver.
  • a parallel circuit LC tuned to a frequency of 9000 cycles.
  • another coil L' In close coupling relationship with coil L is another coil L', which is connected between the cathode of the tube and the cathode resistance R shunted by a condenser C1.
  • the polarity of the coil L' should be so chosen that negative feedback occurs for a frequency of 9 kilocycles (k. c.). It will be understood that the positions of coil L and resistance R could be exchanged, so that L' would have one end connected .toground.
  • Another way to preclude the chance of current negative feedback is to connect the lower end of the primary winding by way of a condenser with the filament, but with the direct current voltage source of supply by way of an ohmic resistance or a choke-coil.
  • the stopper circuit L-'C lies between the .primary winding of the transformer and the positive pole of the voltage source.
  • the stopper circuit by way of condenser C' is in alternatin current parallel connection with the resistance-- R', which is connected in series with the input alternating voltage between cathode and control grid of tube V.
  • the resistance R" in such a scheme must be chosen so high that it will not plifier tube connected in series below tube V, for in this instance there results the eifect of a negative feedback for 9 k. c.
  • FIG. 3 Another embodiment in which a filter circuit rather than astopper circuit is used is shown in Fig. 3 as applied to, and incorporated in, a two-stage'audio amplifier whose last stage is of the push-pull type.
  • a series path comprising condenser C and coil L which are tuned to 9. k. c.
  • the series circuit for the undesired frequencies which, as is to be remembered are not to be attenuated, may not represent an appreciable load for the power stage it should possess a high inductance and low capacity. Under practical conditions this requirement may be satisfied by making at the same time the ohmic resistance of the coil fairly high.
  • Another scheme would be to include the coil L, in whole or'in part, in the control grid lead; that is, between the lower terminal of the input alternating voltage and the ground terminal.
  • the winding of the coil, at all events, is unbroken; in fact, the splitting of the coil into two separate halves would be less satisfactory because of higher damping.
  • the negative regeneration is to comprise only one stage,'then, in the present instance, the coil L maybe connected between the primary coil of the input transformer T and the voltage source of supply. The alternating voltage may then be put out at the plate, or anode, of one of the two power tubes rather than at the output transformer.
  • Fig. 4 shows a further embodiment of the invention comprising a filter circuit and at the same time negative feedback in a single stage amplifier.
  • the filter circuitL-C Between the plate of tube V and ground is included the filter circuitL-C, with transformer coupling relation being established between the coil L of the said filter circuit and the coil L.
  • the latter is contained in the cathode lead of the tube, and it may be tuned by the aid of parallel capacity C to the undesired frequency.
  • an audio amplifier of a radio receiver said amplifier including at least one tube having input terminals, said input terminals being adapted to have the audio modulation voltage of a broadcast carrier impressed therebetween, a reactive network connected across the output terminals of said amplifier, said reactive network being series tuned to the interference frequency pro- .duced by the beating of the said carrier and an adjacent carrier, means for impressing audio voltage of said interference frequency, developed by said reactive network, upon said input terminals .in degenerative phase to said modulation voltage,
  • an audio amplifier comprising an am plifier tube having input terminals and output terminals, means, comprising a push-pull amplifier, coupled to said output terminals, a resonant network, series tunedto a frequency at the upper end of the audio range, connecting between said push-pull amplifier and said input terminals, and means impressing audio voltage of said ,upper frequency developed by said resonant network upon said input terminals in degenerative phase.
  • an audio amplifier comprising an amplifier tube having input terminals, a resonant network, series tuned to a frequency at the upper end of the audio range, connected in shunt to the output terminals of said amplifier, and means impressing audio voltage of said upper frequency developed by said resonant network upon said input terminals in degenerative phase and said network havingan inductive element connected in the space current path of said tube.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Amplifiers (AREA)
US254562A 1938-01-14 1939-02-04 Receiver circuits Expired - Lifetime US2273619A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DET49791D DE713395C (de) 1938-01-14 1938-01-14 Schaltungsanordnung zur Unterdrueckung bestimmter Frequenzen mittels eines frequenzabhaengig gegengekoppelten Verstaerkers
DET2225D DE862310C (de) 1938-01-14 1938-03-17 Empfaenger oder Verstaerker mit einem auf eine zu unterdrueckende Frequenz abgestimmten Sperr- oder Kurzschlusskreis

Publications (1)

Publication Number Publication Date
US2273619A true US2273619A (en) 1942-02-17

Family

ID=26000702

Family Applications (1)

Application Number Title Priority Date Filing Date
US254562A Expired - Lifetime US2273619A (en) 1938-01-14 1939-02-04 Receiver circuits

Country Status (3)

Country Link
US (1) US2273619A (fr)
DE (2) DE713395C (fr)
FR (1) FR848656A (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2732440A (en) * 1956-01-24 newman
US4253070A (en) * 1979-05-04 1981-02-24 Dynamic Compliance, Incorporated Feedback arrangement

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE756556C (de) * 1938-08-28 1954-06-08 Lorenz C Ag Roehrenverstaerkerstufe fuer selektive Spannungsverstaerkung
DE945255C (de) * 1942-04-03 1956-07-05 Klangfilm Gmbh Sprechstromuebertragungsanlage mit Verstaerker und niederohmigem Lautstaerke-Fernregelwiderstand
DE936989C (de) * 1943-05-27 1955-12-29 Telefunken Gmbh Eingangsschaltung fuer Magnetton-Wiedergabeverstaerker
DE1000451B (de) * 1953-06-19 1957-01-10 Siemens Ag Verstaerker mit im Gegenkopplungsweg angeordneten Entzerrernetzwerken
DE1040606B (de) * 1954-02-12 1958-10-09 Siemens Ag Roehrenverstaerkerstufe mit Stromspannungsgegenkopplung
DE1103406B (de) * 1958-02-27 1961-03-30 Deutsche Elektronik Gmbh Frequenzselektiver Verstaerker, insbesondere Niederfrequenzverstaerker

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1677090A (en) * 1928-07-10 A cobpobation of new
GB387050A (en) * 1931-10-21 1933-02-02 William Troutbeck Sanderson Improvements relating to thermionic amplifying apparatus

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2732440A (en) * 1956-01-24 newman
US4253070A (en) * 1979-05-04 1981-02-24 Dynamic Compliance, Incorporated Feedback arrangement

Also Published As

Publication number Publication date
DE713395C (de) 1941-11-06
FR848656A (fr) 1939-11-03
DE862310C (de) 1953-01-08

Similar Documents

Publication Publication Date Title
US2273619A (en) Receiver circuits
US2579345A (en) Amplifier band width control
US2273097A (en) Frequency modulated wave receiver
US2255642A (en) Multiple channel signal transmission system
US2483314A (en) Superheterodyne receiver comprising automatic frequency control
US2647173A (en) Multiple feedback system
US2528182A (en) Frequency discriminator network
US2420249A (en) Amplitude modulation reducing circuit
US2200062A (en) Automatic volume control
US2210497A (en) Amplifying system
US2289821A (en) Degenerative audio amplifier
US2686259A (en) Reduction of amplitude modulation in frequency modulation receivers
US2541650A (en) Wave length modulation
US2121735A (en) Automatic frequency control circuit
US2273134A (en) Dual intermediate frequency amplifier circuit
US2120998A (en) Coupled circuits
US1819299A (en) Tuning system
US2043092A (en) Automatic volume control
US2201365A (en) Duplex vacuum-tube repeater
US2169830A (en) Automatic selectivity control
US2162883A (en) Automatic frequency control system
US2093416A (en) Feedback circuits
US2231863A (en) Biresonant circuit
US2178552A (en) Radio receiving circuits
US2525151A (en) Wave-signal receiver