US1878309A - Radio frequency circuit arrangement - Google Patents

Radio frequency circuit arrangement Download PDF

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Publication number
US1878309A
US1878309A US340049A US34004929A US1878309A US 1878309 A US1878309 A US 1878309A US 340049 A US340049 A US 340049A US 34004929 A US34004929 A US 34004929A US 1878309 A US1878309 A US 1878309A
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US
United States
Prior art keywords
circuit
grid
bridge
output
valve
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
US340049A
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English (en)
Inventor
Green Ernest
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.)
RCA Corp
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RCA Corp
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Filing date
Publication date
Application filed by RCA Corp filed Critical RCA Corp
Application granted granted Critical
Publication of US1878309A publication Critical patent/US1878309A/en
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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
    • H03F1/08—Modifications of amplifiers to reduce detrimental influences of internal impedances of amplifying elements
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
    • H03B19/00—Generation of oscillations by non-regenerative frequency multiplication or division of a signal from a separate source
    • H03B19/06—Generation of oscillations by non-regenerative frequency multiplication or division of a signal from a separate source by means of discharge device or semiconductor device with more than two electrodes
    • H03B19/08—Generation of oscillations by non-regenerative frequency multiplication or division of a signal from a separate source by means of discharge device or semiconductor device with more than two electrodes by means of a discharge device
    • H03B19/10—Generation of oscillations by non-regenerative frequency multiplication or division of a signal from a separate source by means of discharge device or semiconductor device with more than two electrodes by means of a discharge device using multiplication only
    • 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
    • H03F1/08—Modifications of amplifiers to reduce detrimental influences of internal impedances of amplifying elements
    • H03F1/14—Modifications of amplifiers to reduce detrimental influences of internal impedances of amplifying elements by use of neutralising means
    • H03F1/16—Modifications of amplifiers to reduce detrimental influences of internal impedances of amplifying elements by use of neutralising means in discharge-tube amplifiers

Definitions

  • This invention relates "to circuit jarrange- V ments for use with high frequencycurrents,
  • V I relatesto 'amplifying'systems of the kind ⁇ in 5 More particularly the invention which a Wheatstone bridge arrangement :is
  • the, said bridge ; the arrangement, being such, that alternating potential ofqoutput ireg quency 'is appliedytoi; the said grid or grids and since the said bridge remains v balanced,"- no current of output ,vfrequency is fed back tothe jinputtcircuitg V :In one way, of carrying outitheiijnventiom the grid-anode space of an I amplifyingrthefre mionic valve is placed in-;- one arm of permit the ⁇ flow of direct current-to "the 1 grid nvention has: for I its objects to providean amplifier of: the kind referred to, which shall serve as a frequency changer, Which shall remain balanced over a rangeof beenobtain ll the of a the" valve;
  • circuit may b'e
  • the elements in the arm of the inafte'r called the grid 'o fthe valve,
  • connection leads themselvesgi zcin others'itiwill ibe necessary to adjust 1' the "variable induc tance in the grid armito obtain-the desired Value.
  • connection?leads do notnecessary, thecondens'erlin the grid-arm ma ["beaom1tted at very hlghi trequencies, how
  • connection leads providemorethan sufficient-3; inductance, .inqvvhichtcase the ,variablecon-" ⁇ denser is adjustedto compensatelzfor"excess; Therequiredin'ductancehaving r or ridarmg e remaining arms of the'bridge are'then'adjusmdusothat capacitative freactance, induc I ⁇ tivejreactance and resistance inall four armfs Wheatstone "bridge the other three arms of which comprise each a variablegcondenser, a-r 'variableresistance and a variable inductance in series.
  • The', arm .containing the gridanode space of thevalve-a lso contains w 1; riable' resistance, ga-variable inductance and are equalfeach to'each.
  • w 1 riable' resistance, ga-variable inductance and are equalfeach to'each.
  • circuit may be employed for all harmonics. If odd harmonicsonly are required, the circuit should be modified '(in a manner known per se) tojinclude a thermionicvalve' ineach of two opposite a rmsof th'ebridge;
  • variable-impedance decentre point ar a Preferably, however, variable-impedance decentre point ar
  • circuit comprises inductances 7 L1 and L2 and'adjustablecondensers K1- and K2, the positive high tension power tween the inductances.
  • P3, P4 are inserted one in each arm of the bridge. 1 D]; is 7 an adjustable condensers inserted-in.thezgrid arm o'fsaid bridge, and M is achoke to supply the grid feed. S is a resistance. Y
  • a separate condenser D1 may I j V be dispensed with,-it beingpossible to obtain small ad ustable resistancesr1, r2, T3 and P2,-P3, P4 may be dispensed with, the necessary inductive-values (which at .very high frequencies will be exceedingly small) being obstained by "suitably-arranging the various connecting leads and the adjustment to obtain theldesiredinductive reactance between the points 4 and G being obtained by means 10f I the condenser D1,
  • a thermionic valve In an amplifying system, a thermionic valve, a circuit for impressing signal oscillations on the input elements thereof, an output circuit therefor, said first named circuit and said output circuit being uncoupled magnetically, and means for applyingthe oscillations in said output circuit to the input elements of said valve, including means for preventing exchange .of current between said circuits. 7
  • Invan amplifying system a thermlonlc V valve, a circuit for impressing signal oscillaof said tube, and means for applying the.
  • a thermionic valve In an amplifying system, a thermionic valve, a circuit for impressing signal. oscillations on the input elements thereof,- an output circuit tunedvto a harmonic of said signal oscillations connected to the output elements voltage oscillations in said output circuit to the input elements of said valve, including in-,
  • a Wheatstone bridge amplifying system whose output circuit is tuned to a harmonic 1 of the input circuit frequency sa1d system comprising bridge arms whose capacitative quency is applied to the said grid and since the said bridge remains balanced, no. current of output frequency is fed back to theinput circuit.
  • variable inductance coils are provid- 'ed in the bridge arms;
  • said tubes each having anode,..cathode and I grid electrodes, an output circuit connected between the anodes of said tubes, a pair of seriescapacities connected between the anode V of each of saidtubes an'dthe gridof the other of said tubes and means for-impressing oscils I lations at signal frequency between the points of connectionvbetween said series capacities.
  • a thermionicrelay having anode cathode andgrid electrodes, a balanced bridge circuit each arm of which includes acapacity andonearm of which also includes the grid to. anode cap'acity of said relay, meansfor impressing oscillations at signa'l'frequency across a pair of conjugate nodal points on said bridge,.a 'tanl: circuit connected across anotherfpair. of con ugate nodal points on said'bridge and a harmonic of the signal frequency.
  • a thermionic tube having anode, cathode and grid electrodes, a WVheatstone bridge circuit having balanced arms, one of:
  • po nts on said bridge circuit one of said' points being, adjacent to 'theanode ofsaid tube, means for tuning the output, circuit to a harmonic of the input frequency, means ineluding capacity in one arm of said bridge for lmpressi'ng voltage'oscillations at the harmonic frequency from said output circuit to the input elements ofsaid tube, and means in one of said arms for preventing'current char acteristic of the output current from reach- 111g sa1d inputclrcuit including an inductance reactive at output frequency invone arm of said bridge.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)
US340049A 1928-03-07 1929-02-15 Radio frequency circuit arrangement Expired - Lifetime US1878309A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB7132/28A GB313111A (en) 1928-03-07 1928-03-07 Improvements in or relating to circuit arrangements for use with high frequency currents

Publications (1)

Publication Number Publication Date
US1878309A true US1878309A (en) 1932-09-20

Family

ID=9827216

Family Applications (1)

Application Number Title Priority Date Filing Date
US340049A Expired - Lifetime US1878309A (en) 1928-03-07 1929-02-15 Radio frequency circuit arrangement

Country Status (6)

Country Link
US (1) US1878309A (is")
BE (1) BE358668A (is")
DE (1) DE509165C (is")
FR (1) FR670147A (is")
GB (1) GB313111A (is")
NL (1) NL31427C (is")

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE970507C (de) * 1952-05-10 1958-09-25 Siemens Ag Scheibenfoermiger, piezoelektrischer Schwingungskoerper mit ununterbrochener Abstrahlflaeche

Also Published As

Publication number Publication date
DE509165C (de) 1930-10-04
BE358668A (is")
GB313111A (en) 1929-06-07
FR670147A (fr) 1929-11-25
NL31427C (is")

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