US2617022A - Mixing detector circuit arrangement - Google Patents

Mixing detector circuit arrangement Download PDF

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Publication number
US2617022A
US2617022A US3476A US347648A US2617022A US 2617022 A US2617022 A US 2617022A US 3476 A US3476 A US 3476A US 347648 A US347648 A US 347648A US 2617022 A US2617022 A US 2617022A
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United States
Prior art keywords
frequency
resonant circuit
circuit
voltage
central frequency
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Expired - Lifetime
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US3476A
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English (en)
Inventor
Adrianus Johannes Wilhel Marie
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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
    • H03D3/00—Demodulation of angle-, frequency- or phase- modulated oscillations
    • H03D3/02—Demodulation of angle-, frequency- or phase- modulated oscillations by detecting phase difference between two signals obtained from input signal
    • H03D3/22—Demodulation of angle-, frequency- or phase- modulated oscillations by detecting phase difference between two signals obtained from input signal by means of active elements with more than two electrodes to which two signals are applied derived from the signal to be demodulated and having a phase difference related to the frequency deviation, e.g. phase detector

Definitions

  • the invention relates to a mixing detector circuit-arrangement for detecting frequencymodulated oscillations, in which the frequencymodulated oscillations required to be detected are fed to one of two interconnected circuits and in which the phase-displaced oscillations set up across the two circuits are fed to two controlgrids of a mixing tube. If the phase-displacement between the oscillations fed to the two controlgrids varies with the frequency of the oscillations supplied, the anode current of the mixing tube contains a low-frequency component which, to a first approximation, is proportional to the frequency sweep of the oscillations to be detected.
  • a circuit-arrangement of this kind is described, for example, in the prior patent specification No. 660,875 (PH. 9272).
  • the coupled circuits, from which the two phase-displaced oscillations are taken must constitute a network which satisfies the following conditions:
  • phase-displacement between the two output oscillations must be approximately 90 for the central frequency of the oscillations to be detected.
  • phase-displacement must, even for the greatest frequency sweep, be proportional to the frequency sweep.
  • the characteristic curve which illustrates the phase-displacement as a function of frequency must extend horizontally for frequency sweeps exceeding the highest frequency sweep occurring.
  • the first condition guarantees a symmetrical field of operation.
  • the fourth condition has the effect of cutting 01f peaks in the transmitted signal. This condition excludes a receding characteristic curve corresponding to circuits not tuned to the central frequency, for great frequency sweeps; in this case peak voltages in the signal to be transmitted would lead to excessive distortions of the detected signal.
  • a circuit-arrangement comprising two coupled circuits satisfies the first, third and fourth of the aforesaid conditions but the linearity is insufiicient for great frequency sweeps.
  • the invention has for its object to provide a circuit-arrangement which while complying with all the above mentioned requirements is adapted to be carried out at a very low cost.
  • the second of the two coupled circuits has coupled to it a third circuit which is tuned to the central frequency of the oscillations to be detected.
  • the coupling and the damping of this third circuit may be such that a more satisfactory straight-line relationship is ensured.
  • the oscillations to be detested are fed through a lead I to a network 2 which comprises the two coupled circuits 3 and 4 across which are produced two voltages which are fed to the two control-grids 5 and 6 of a mixing tube I.
  • the circuit 4 is tuned to the central frequency of the oscillations to be detected, so that the phase difference between the voltage across the grid 5 and that across the grid 6 is for the central frequency.
  • the anode current of the tube 1 contains a lowfreqeuncy component which, to a first approximation, is proportional to the frequency sweep of the oscillations to be detected. For great frequency sweeps, however, the divergence from the straight-line relationship is inadmissibly large.
  • a circuit 8 which is coupled to the circuit 4 and which is also tuned to the central frequency of the oscillations to be detected.
  • a mixing detector circuit arrangement for a signal voltage having frequency deviations about a given central frequency comprising an electron discharge tube having in the order named a cathode, first and second control grids and an anode, a first resonant circuit tuned to said given central frequency, a second resonant circuit tuned to said given central frequency and coupled to said first resonant circuit, means to apply said signals to said first resonant circuit, means to derive a first voltage from said first resonant circuit and to apply said first voltage to one of said control grids, means to derive a second voltage in phase quadrature with said first voltage at said given central frequency from said second resonant circuit and to apply said second voltage to the other of said control grids thereby to vary the anode current of said tube proportional to the frequency deviations of said signals, and a third resonant circuit tuned to. said given central frequency and inductively coupled solely to said second resonant circuit thereby to linearize the relationship between said anode current variation and the frequency deviations of said signals
  • a mixing detector circuit arrangement for a signal voltage having frequency deviations about a given central frequency comprising an electron discharge tube having in the order named a cathode, first and second control grids and an anode, a first parallel resonant circuit tuned to said given central frequency, a second parallel resonant circuit tuned to said given central frequency and inductively coupled to said first resonant circuit, means to apply said signals to said first resonant circuit, means to derive a first voltage from said first resonant circuit and to apply said first voltage to one of said control grids, means to derive a second voltage in phase quadrature with said first voltage at said given central frequency from said second resonant circuit and to apply said second voltage to the other of said control grids thereby to vary the anode current of said tube proportional to the frequency deviations of said signals, and a third parallel resonant circuit tuned to said given central frequency and inductively coupled solely to said second parallel resonant circuit thereby to linearize the relationship between said anode current variation and
  • a mixing detector circuit arrangement for a signal voltage having frequency deviations 4 about a given central frequency comprising an electron discharge tube having in the order named a cathode, first and second control grids and an anode, a first resonant circuit tuned to said given central frequency, a second resonant circuit having a given damping factor and being tuned to said given central frequency and coupled to said first resonant circuit, means to apply said, signals to said first resonant circuit, means to derive a first voltage from said first resonant circuit and to apply said first voltage to one of said control grids, means to derive a second voltage in phase quadrature with said first voltage at said given central frequency from said second resonant circuit and to apply said second voltage to the other of said control grids thereby to vary the anode current of said tube proportional to the frequency deviations of said signals, and a third resonant circuit having a second given damping factor and being tuned to said given central frequency and inductively coupled with a given coupling solely to said second
  • D32 represents the quotient of the damping factors of the third resonant circuit and the second resonant circuit
  • a is a first constant having a value between 1.5 and 2.5
  • K32 represents the quotient of the given coupling between said third resonant circuit and said second resonant circuit multiplied by said given central frequency and the loss resistance of said second resonant circuit
  • b is a second constant having a value between 0.2 and 0.3.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Gyroscopes (AREA)
  • Optical Transform (AREA)
US3476A 1947-01-24 1948-01-21 Mixing detector circuit arrangement Expired - Lifetime US2617022A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL642782X 1947-01-24

Publications (1)

Publication Number Publication Date
US2617022A true US2617022A (en) 1952-11-04

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ID=19791820

Family Applications (1)

Application Number Title Priority Date Filing Date
US3476A Expired - Lifetime US2617022A (en) 1947-01-24 1948-01-21 Mixing detector circuit arrangement

Country Status (5)

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US (1) US2617022A (it)
DE (1) DE810521C (it)
FR (1) FR960109A (it)
GB (1) GB642782A (it)
NL (1) NL66627C (it)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2773182A (en) * 1951-07-19 1956-12-04 Hartford Nat Bank & Trust Co Circuit-arrangement for silent tuning in a frequency-modulation receiver
US2844720A (en) * 1954-12-06 1958-07-22 Radio Frequency Lab Inc Frequency shift discriminator
US2888558A (en) * 1954-11-18 1959-05-26 Radio Frequency Lab Inc Frequency shift discriminator
US2994830A (en) * 1959-04-13 1961-08-01 Texas Instruments Inc Tetrode transistor fm detector

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1018480B (de) * 1956-03-26 1957-10-31 Telefunken Gmbh Diskriminatoranordnung fuer sehr hohe Frequenzen

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2343263A (en) * 1942-05-06 1944-03-07 Hazeltine Corp Carrier-signal frequency detector
US2445996A (en) * 1945-01-13 1948-07-27 Philco Corp Frequency modulation detector circuit
US2448177A (en) * 1943-08-27 1948-08-31 Hazeltine Research Inc Variable-frequency oscillator system
US2448908A (en) * 1944-07-13 1948-09-07 Louis W Parker Television receiver
US2457016A (en) * 1945-10-26 1948-12-21 Rca Corp Frequency modulation receiver tuning aid

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2343263A (en) * 1942-05-06 1944-03-07 Hazeltine Corp Carrier-signal frequency detector
US2448177A (en) * 1943-08-27 1948-08-31 Hazeltine Research Inc Variable-frequency oscillator system
US2448908A (en) * 1944-07-13 1948-09-07 Louis W Parker Television receiver
US2445996A (en) * 1945-01-13 1948-07-27 Philco Corp Frequency modulation detector circuit
US2457016A (en) * 1945-10-26 1948-12-21 Rca Corp Frequency modulation receiver tuning aid

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2773182A (en) * 1951-07-19 1956-12-04 Hartford Nat Bank & Trust Co Circuit-arrangement for silent tuning in a frequency-modulation receiver
US2888558A (en) * 1954-11-18 1959-05-26 Radio Frequency Lab Inc Frequency shift discriminator
US2844720A (en) * 1954-12-06 1958-07-22 Radio Frequency Lab Inc Frequency shift discriminator
US2994830A (en) * 1959-04-13 1961-08-01 Texas Instruments Inc Tetrode transistor fm detector

Also Published As

Publication number Publication date
GB642782A (en) 1950-09-13
FR960109A (it) 1950-04-13
DE810521C (de) 1951-08-13
NL66627C (it)

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