GB638004A - Improvements in mixing circuits for ultra-high frequencies - Google Patents

Improvements in mixing circuits for ultra-high frequencies

Info

Publication number
GB638004A
GB638004A GB1097/47A GB109747A GB638004A GB 638004 A GB638004 A GB 638004A GB 1097/47 A GB1097/47 A GB 1097/47A GB 109747 A GB109747 A GB 109747A GB 638004 A GB638004 A GB 638004A
Authority
GB
United Kingdom
Prior art keywords
frequency
circuit
push
pull
lecher
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
Application number
GB1097/47A
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.)
Philips Lamps Ltd
Koninklijke Philips NV
Original Assignee
Philips Lamps Ltd
Philips Gloeilampenfabrieken NV
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 Philips Lamps Ltd, Philips Gloeilampenfabrieken NV filed Critical Philips Lamps Ltd
Publication of GB638004A publication Critical patent/GB638004A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • H03D7/1416—Balanced arrangements with discharge tubes having more than two electrodes
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/54—Amplifiers using transit-time effect in tubes or semiconductor devices
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H2/00—Networks using elements or techniques not provided for in groups H03H3/00 - H03H21/00
    • H03H2/005—Coupling circuits between transmission lines or antennas and transmitters, receivers or amplifiers
    • H03H2/008—Receiver or amplifier input circuits
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J3/00—Continuous tuning
    • H03J3/28—Continuous tuning of more than one resonant circuit simultaneously, the tuning frequencies of the circuits having a substantially constant difference throughout the tuning range

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)

Abstract

638,004. Valve circuits. PHILIPS LAMPS, Ltd. Jan. 13, 1947, No. 1097. Convention date, Oct. 27, 1943. [Classes 40 (v) and 40 (vi)] In a U.H.F. mixing circuit tunable over a large frequency range an improved signal/noise ratio is obtained by applying one of the signals to be mixed in phase and the other in push-pull through a Lecher system to a pair of valves. In addition the Lecher system is arranged so that the push-pull circuit is tuned to the frequency of the input in push-pull and the circuit comprised by the parallel connection of both halves of the push-pull circuit together with the input impedances of the valves and input circuits is tuned to the frequency of the signal applied in phase. The Figure shows a mixer circuit for a superheterodyne receiver which is self oscillatory at the local oscillator frequency. A signal from a dipole aerial D<1>, D<11> is applied via a Lecher wire system L<1>1, L<11>1 which is tuned to the frequency of the incoming signals by a shorting bridge K, the lines being correctly terminated by resistors R2, R3. The resonant circuit comprised by inductors L<1>3, L<11>3 and capacitors C<1>2, C"2, is tuned to the I.F. frequency, the inductors L<1>2, L"2, being H.F. chokes. Inductor L2 produces positive feedback at the resonant frequency of the in-phase circuit so that the circuit is oscillatory at this frequency and an external local oscillator is unnecessary. Simultaneous tuning of both the push-pull and in-phase circuits by adjustment of the bridge K is achieved when the I.F. frequency is low, by making the product of the surge resistance and terminal capacity of the two Lecher lines with respect to each other sub-À stantially equal to the product of the same two constants of the two lines jointly with respect to earth. Thus when the terminal capacities consist almost exclusively of the valve input capacities as in the Figure, the surge resistance of the two lines with respect to each other should be four times as high as their joint surge resistance with respect to earth. This latter constant may be adjusted as shown in the Figure by varying the distance between the Lecher system and an earthed metal plate. Specification 632,658 is referred to.
GB1097/47A 1943-10-27 1947-01-13 Improvements in mixing circuits for ultra-high frequencies Expired GB638004A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL250225X 1943-10-27

Publications (1)

Publication Number Publication Date
GB638004A true GB638004A (en) 1950-05-31

Family

ID=19781056

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1097/47A Expired GB638004A (en) 1943-10-27 1947-01-13 Improvements in mixing circuits for ultra-high frequencies

Country Status (7)

Country Link
US (1) US2595997A (en)
BE (1) BE459216A (en)
CH (1) CH250225A (en)
DE (1) DE862028C (en)
FR (1) FR920715A (en)
GB (1) GB638004A (en)
NL (1) NL68156C (en)

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2011943A (en) * 1933-01-26 1935-08-20 Rca Corp Ultra short wave reception
NL58874C (en) * 1938-01-29
US2307074A (en) * 1938-09-22 1943-01-05 George E Pray Modulating circuit for high frequencies
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
BE445613A (en) * 1941-05-19
US2479537A (en) * 1942-12-30 1949-08-16 Gen Electric Detector-oscillator circuit for ultra high frequency receivers

Also Published As

Publication number Publication date
US2595997A (en) 1952-05-06
CH250225A (en) 1947-08-15
BE459216A (en) 1946-01-05
NL68156C (en) 1951-07-16
FR920715A (en) 1947-04-16
DE862028C (en) 1953-01-08

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