US2828410A - Mixing circuit comprising a self-oscillating triode with intermediate-frequency feed-back - Google Patents

Mixing circuit comprising a self-oscillating triode with intermediate-frequency feed-back Download PDF

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Publication number
US2828410A
US2828410A US408512A US40851254A US2828410A US 2828410 A US2828410 A US 2828410A US 408512 A US408512 A US 408512A US 40851254 A US40851254 A US 40851254A US 2828410 A US2828410 A US 2828410A
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US
United States
Prior art keywords
circuit
frequency
triode
self
mixing circuit
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Expired - Lifetime
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US408512A
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English (en)
Inventor
Rongen Jacobus Johannes
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.)
US Philips Corp
North American Philips Co Inc
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US Philips Corp
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Publication date
Application filed by US Philips Corp filed Critical US Philips Corp
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Publication of US2828410A publication Critical patent/US2828410A/en
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    • 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
    • H04B1/16—Circuits
    • H04B1/163—Special arrangements for the reduction of the damping of resonant circuits of receivers
    • 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
    • H03D7/06—Transference of modulation from one carrier to another, e.g. frequency-changing by means of discharge tubes having more than two electrodes
    • H03D7/08—Transference of modulation from one carrier to another, e.g. frequency-changing by means of discharge tubes having more than two electrodes the signals to be mixed being applied between the same two electrodes
    • 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

  • the invention relates to' a mixing circuit comprising a self-oscillating triode with" feed-back of the intermediateconstituted by a triode used in a self-oscillating circuit. 25
  • the compensation arrangement may furthermore be such that for the grid of the oscillator tube a low-frequency negative feed-back is obtained.
  • the value of the leak resistance becomes materially higher than in the absence of this negative feed-back. Since the noise of the mixing tube is lower according as the grid current is lower, the use of a high leak resistance provides an appreciable improvement in the signal-noise ratio 50 of the mixing stage.
  • Fig. 1 shows a circuit arrangement in accordance with the prior art.
  • reference numeral 1 designates the mixing triode, 2 the high-frequency input circuit, to which the incoming signal is supplied and 3 the circuit determining the oscillator frequency.
  • the inductance of the latter is coupled inductively with an inductor 4, which is connected in series with a capacitor 5 between the grid and the cathode of tube 1.
  • the end of the circuit 2, not connected to earth is connected to a tapping, in general the centre, of the inductor 4.
  • the circuit 3 is connected to earth and on the other hand through a capacitor to the anode.
  • the circuit arrangement-described" above has the disadvantage thatowing to the feed-back of the intermediatefr'equency voltage to the'lowerside' of the high-frequency circuit the degree of compensation of the internal resistance of the triode varies with the position of the tuning capacitor of the high-frequency circuit 2, since in most cases it is desirable or necessary to connect the latter on one side to earth.
  • a further disadvantage is that during manufacture it is more difiicult to reproduce the highfrequency circuit with respect to the tolerances in component parts and the mounting.
  • the connecting wires will always exhibit a certain degree of inductance, which exerts an influence on high-frequencies, which cannot be neglected.
  • the invention has for its object to provide an improvement therein. It consists in that the primary inductor of the intermediate-frequency bandpass filter 6, 7 is connected electrically directly between the grid and the anode of the tube. In this case measures must, of course, be
  • Figs. 2 to 7 show a few embodiments of such a circuit arrangement.
  • the various parts are designated by the same reference numerals as the corresponding parts of the arrangement shown in Fig. 1.
  • Fig. 3 shows a slightly modified arrangement.
  • the fed-back intermediate-frequency voltage is supplied to the tapping of the coil 4.
  • the capacity of the capacitor 5, for neutralizing the gridcathode capacity plays a part.
  • Fig. 5 shows an oscillator arrangement comprising a capacitative cathode impedance.
  • the grid circuit of the oscillator comprises two relatively balanced parts 3 and 12, so that the high-frequency oscillation may be coupled with the oscillator circuit in a simple manner.
  • the intermediate-frequency tions to an electrode of l.
  • a mixing circuit arrangement comprising a triode tube having a grid and an anode, an oscillatory circuit connected to an electrode of said triode to cause selfoscillations, at source of input oscillations, signal-conducting means comprising two capacitors connected in series to provide a path for feeding said input oscillasaid tube whereby said input oscillations and said self-oscillations are mixed to provide intermediate-frequency oscillations, and an intermediatefrequency bandpass filter having a primary inductance directly connected electrically between said anode and the junction of said two series-connected capacitors thereby providing feedback of said intermediate-frequency oscillations.
  • a mixing circuit as claimed in claim 1 including a source of operating voltage and a resistor connected at an end thereof to a terminal of said source of operating voltage, the remaining end of said resistor being connected to the end of said primary inductance which is connected electrically to said junction of the two series-connected capacitors.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
US408512A 1953-02-12 1954-02-05 Mixing circuit comprising a self-oscillating triode with intermediate-frequency feed-back Expired - Lifetime US2828410A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL754226X 1953-02-12

Publications (1)

Publication Number Publication Date
US2828410A true US2828410A (en) 1958-03-25

Family

ID=19825225

Family Applications (1)

Application Number Title Priority Date Filing Date
US408512A Expired - Lifetime US2828410A (en) 1953-02-12 1954-02-05 Mixing circuit comprising a self-oscillating triode with intermediate-frequency feed-back

Country Status (5)

Country Link
US (1) US2828410A (de)
DE (1) DE1033274B (de)
FR (1) FR1098772A (de)
GB (1) GB754226A (de)
NL (2) NL176033B (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3127562A (en) * 1960-02-29 1964-03-31 Ass Elect Ind Transistor frequency converter providing neutralization of degenerating impedance elements
US3181068A (en) * 1960-08-19 1965-04-27 Pye Ltd High frequency transistor circuits

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL105942C (de) * 1956-08-24
DE1083354B (de) * 1958-03-20 1960-06-15 Telefunken Gmbh Schaltungsanordnung zur Entdaempfung des abgestimmten ZF-Kreises einer selbstschwingenden Mischstufe mit Transistor

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2582725A (en) * 1943-05-03 1952-01-15 Hartford Nat Bank & Trust Co Frequency changing circuit arrangement
US2631229A (en) * 1949-08-05 1953-03-10 Frank O Chesus Oscillator-mixer circuit with single triode tube
US2753449A (en) * 1952-01-30 1956-07-03 Gail E Boggs Superheterodyne mixer with negative feedback for stabilizing conversion gain

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR709238A (fr) * 1930-01-27 1931-08-04 Gramophone Co Ltd Perfectionnements aux soupapes thermoioniques
BE446775A (de) * 1941-08-08

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2582725A (en) * 1943-05-03 1952-01-15 Hartford Nat Bank & Trust Co Frequency changing circuit arrangement
US2631229A (en) * 1949-08-05 1953-03-10 Frank O Chesus Oscillator-mixer circuit with single triode tube
US2753449A (en) * 1952-01-30 1956-07-03 Gail E Boggs Superheterodyne mixer with negative feedback for stabilizing conversion gain

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3127562A (en) * 1960-02-29 1964-03-31 Ass Elect Ind Transistor frequency converter providing neutralization of degenerating impedance elements
US3181068A (en) * 1960-08-19 1965-04-27 Pye Ltd High frequency transistor circuits

Also Published As

Publication number Publication date
FR1098772A (fr) 1955-08-22
DE1033274B (de) 1958-07-03
GB754226A (en) 1956-08-08
NL176033B (nl)
NL84011C (de)

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