US2591749A - Amplitude modulation system - Google Patents

Amplitude modulation system Download PDF

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Publication number
US2591749A
US2591749A US160755A US16075550A US2591749A US 2591749 A US2591749 A US 2591749A US 160755 A US160755 A US 160755A US 16075550 A US16075550 A US 16075550A US 2591749 A US2591749 A US 2591749A
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transformer
pair
rectifiers
amplitude modulation
pentode
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US160755A
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Villemagne Jean Marie
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International Standard Electric Corp
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International Standard Electric Corp
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C1/00—Amplitude modulation
    • H03C1/52—Modulators in which carrier or one sideband is wholly or partially suppressed
    • H03C1/54—Balanced modulators, e.g. bridge type, ring type or double balanced type

Definitions

  • the present invention relates to very wide frequency band amplitude modulation devices, particularly those providing carrier suppression.
  • modulating devices there is obtained generally in the output besides modulation products; currents comprising either the carrier current or the modulating current or combinations of these currents and of their harmonics.
  • currents comprising either the carrier current or the modulating current or combinations of these currents and of their harmonics.
  • filters have been employed, in the output of the modulating device which introduce undesirable effects, such as different phase shifting at different operating frequencies, etc.
  • One of the objects of the present invention is to provide an amplitude modulation device with a very wide frequency band which delivers in its output only modulation products, without the need for the use of filters.
  • Another object of the present invention is to provide a multiplier device in which the two voltages to be multiplied play effectively the same role in order to obtain an output voltage which is effectively proportional to the two input voltages.
  • a translation system comprising two pairs of rectifiers, a first means for applying a sinusoidal voltage in push-pull to each pair of rectifiers, a second means for applying a sinusoidal voltage in push-pull to each pair of rectifiers in the same sense as the first means with respect to one pair of rectifiers but in the opposite sense with respect to the other pair of rectifiers, and a pair of output terminals each terminal connected to the output of one pair of rectifiers.
  • the mid-point I2 of the secondary winding of transformer II is connected to a biasing battery l3.
  • the terminal l4 of the secondary winding 10 of transformer II is connected by means of a resistance [5, on the one hand to the control grid I6 of pentode 4 and on the other hand to the control grid ll of pentode 2;
  • the terminal I8 of the secondary winding l0 of transformer H is connected by means of resistance 19 on the one hand to the grid 20 of pentode l and on the other hand to the grid 2
  • the mid-point 22 of the secondary winding 23 of transformer 24 is connected through a resistance 25 to the positive terminal of a high tension battery 26.
  • the terminal 21 of secondary winding 23 of the transformer 24 is connected on the one hand to the grid 28 of pentode 3 and on the other hand to the grid 29 of pentode 4.
  • the terminal 30 of the secondary winding 23 of transformer 24 is connected on the one hand to the grid 3
  • the anodes 33 and 34 of pentodes l and 4 are connected to the terminal 35 of the primary winding 36 of transformer 31.
  • the anodes 38 and 39 are connected to the terminal 40 of the primary winding 36 of transformer 31.
  • of the primary winding 36 of transformer 31 is connected to the positive terminal of the high tension battery 26.
  • transformers II and 24 may be replaced by outphasing tubes as well known in the art.
  • A- translation system according: to claim 1 further including a plurality of adjustable resistant elements, at least one of said resistant elements being inserted in series in the connections from each of said cathodes to ground.

Description

April 8, 1952 J. M. VILLEMAGNE AMPLITUDE MODULATION SYSTEM Filed May 8, 1950 INVENTOR JEAN M. VILLEMAGNE Q BY ATTORNEY Patented Apr. 8, 1952 AMPLITUDE MODULATION SYSTEM Jean Marie Villemagne, Paris, France, assignor to International Standard Electric Corporation, New York, N. Y., a corporation of Delaware Application May 8, 1950, Serial No. 160,755
In France June 3, 1949 3 Claims. (01. 332-44) The present invention relates to very wide frequency band amplitude modulation devices, particularly those providing carrier suppression.
In known modulating devices, there is obtained generally in the output besides modulation products; currents comprising either the carrier current or the modulating current or combinations of these currents and of their harmonics. When it is necessary to obtain pure modulation products, filters have been employed, in the output of the modulating device which introduce undesirable effects, such as different phase shifting at different operating frequencies, etc.
One of the objects of the present invention is to provide an amplitude modulation device with a very wide frequency band which delivers in its output only modulation products, without the need for the use of filters.
Another object of the present invention is to provide a multiplier device in which the two voltages to be multiplied play effectively the same role in order to obtain an output voltage which is effectively proportional to the two input voltages.
7 According to a feature of the invention, there is provided a translation system comprising two pairs of rectifiers, a first means for applying a sinusoidal voltage in push-pull to each pair of rectifiers, a second means for applying a sinusoidal voltage in push-pull to each pair of rectifiers in the same sense as the first means with respect to one pair of rectifiers but in the opposite sense with respect to the other pair of rectifiers, and a pair of output terminals each terminal connected to the output of one pair of rectifiers.
The above-mentioned and other features and objects of this invention and the manner of attaining them will become more apparent and the invention itself will be best understood, by reference to the following description of an embodiment of the invention taken in conjunction with the accompanying drawings, wherein the single figure is a schematic diagram of a system for combining signals which may be used either as a modulator or as a frequency enerator.
In the drawing there is shown four vacuum tubes of the pentode type i, 2, 3 and 4 and adjustable resistances 5, 6, l and 8 and a fixed resistance 9 used for adjusting the working conditions of the said tubes.
The mid-point I2 of the secondary winding of transformer II is connected to a biasing battery l3. lThe terminal l4 of the secondary winding 10 of transformer II is connected by means of a resistance [5, on the one hand to the control grid I6 of pentode 4 and on the other hand to the control grid ll of pentode 2; the terminal I8 of the secondary winding l0 of transformer H is connected by means of resistance 19 on the one hand to the grid 20 of pentode l and on the other hand to the grid 2| of pentode 3. The mid-point 22 of the secondary winding 23 of transformer 24 is connected through a resistance 25 to the positive terminal of a high tension battery 26. The terminal 21 of secondary winding 23 of the transformer 24 is connected on the one hand to the grid 28 of pentode 3 and on the other hand to the grid 29 of pentode 4. The terminal 30 of the secondary winding 23 of transformer 24 is connected on the one hand to the grid 3| of pentode 2 and on the other hand to the grid 32 of pentode l. The anodes 33 and 34 of pentodes l and 4 are connected to the terminal 35 of the primary winding 36 of transformer 31. The anodes 38 and 39 are connected to the terminal 40 of the primary winding 36 of transformer 31. The midpoint 4| of the primary winding 36 of transformer 31 is connected to the positive terminal of the high tension battery 26.
The arrangement having been described, its operation is as follows: if a sinusoidal voltage is applied to the primary winding 42 of transformer I I it will be seen on the drawing that the pentodes l and 2, 3 and 4 act as the vacuum tubes of two push-pull sets or pairs placed in opposition and no current is then obtained in the secondary winding 43 of transformer 37. The same result is obtained when the primary winding of transformer 24 is fed with a sinusoidal current. On the contrary if two sinusoidal voltages, such as a carrier wave and a modulating wave, are respectively applied to the terminals 44 and 45 of the primary winding 42 of transformer II and to the terminals 46 and 41 of the primary winding 48 of transformer 24, it follows from the fact these voltages are applied by means of the circuits described above, to different grids of each one of the pentodes I, 2, 3 and 4 that there is obtained in the output of transformer 31 a modulated current comprising only the side bands, the carrier frequency and the modulation frequency having been eliminated by the operation of the circuits placed in opposition.
If there is applied to the primary windings 42 and 48 of the two transformers H and 24 the same sinusoidal voltage, there is obtained in the secondary winding 43 of transformer 31 the second harmonic of the input current to the device which in this case operates as a multiplier.
It is obvious that the transformers II and 24 may be replaced by outphasing tubes as well known in the art.
While I have described above the principles of my invention in connection with specific apparatus, it is to be clearly understood that this a ment of each tube, a second means for applying a sinusoidal voltage balanced with respect. to. ground in push-pull to each pair of tubes. in the; same sense as the first means with respect to one pair of tubes but in the. opposite sensewith re-- spect to the other pair oi tubes, said second means including connections. to. another control element of each tube, said firstand. second means: including connections to ground, andapair: of output terminals, each terminal connected: to the output of onepair'of tubes.
2; A- translation system according: to claim 1 further including a plurality of adjustable resistant elements, at least one of said resistant elements being inserted in series in the connections from each of said cathodes to ground.
3. A frequency multiplier comprising two pairs of rectifiers, a first means for applying a sinusoidal: voltage. inpush-pull' to each; pain of rectifiers, a=second means for applying the-same-sinusoidal voltage in push-pull to each pair of rectifiers in the same sense as the first means with respect to one pair of rectifiers but in the opposite sense with respect to the other pair of rectifiers, and a pair oi'output. terminals each terminal connected to; the. outputrn". one pair of rectifiers.
JEAN MARIE VI-LLEMAGNE.
REFERENCES CITED The following references are of record in the file of this patent:
UNITED STATES- PATENTS Number Name Date.
2,239,376 Brunrr Apr..29, 1941 2,275,020 Purington Mar..3,,1942 2,484,107 Maron: Oct. 11, 1949
US160755A 1949-06-03 1950-05-08 Amplitude modulation system Expired - Lifetime US2591749A (en)

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Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2856586A (en) * 1953-08-13 1958-10-14 Gen Precision Lab Inc Mixer-modulator
US7184723B2 (en) 2004-10-22 2007-02-27 Parkervision, Inc. Systems and methods for vector power amplification
US20070247217A1 (en) * 2006-04-24 2007-10-25 Sorrells David F Systems and methods of rf power transmission, modulation, and amplification, including embodiments for amplifier class transitioning
US20080285681A1 (en) * 2007-05-18 2008-11-20 Sorrells David F Systems and Methods of RF Power Transmission, Modulation, and Amplification
US7620129B2 (en) 2007-01-16 2009-11-17 Parkervision, Inc. RF power transmission, modulation, and amplification, including embodiments for generating vector modulation control signals
US20100075623A1 (en) * 2007-06-19 2010-03-25 Parkervision, Inc. Systems and Methods of RF Power Transmission, Modulation, and Amplification, Including Embodiments for Controlling a Transimpedance Node
US7885682B2 (en) 2006-04-24 2011-02-08 Parkervision, Inc. Systems and methods of RF power transmission, modulation, and amplification, including architectural embodiments of same
US7911272B2 (en) 2007-06-19 2011-03-22 Parkervision, Inc. Systems and methods of RF power transmission, modulation, and amplification, including blended control embodiments
US8031804B2 (en) 2006-04-24 2011-10-04 Parkervision, Inc. Systems and methods of RF tower transmission, modulation, and amplification, including embodiments for compensating for waveform distortion
US8334722B2 (en) 2007-06-28 2012-12-18 Parkervision, Inc. Systems and methods of RF power transmission, modulation and amplification
US8755454B2 (en) 2011-06-02 2014-06-17 Parkervision, Inc. Antenna control
US9106316B2 (en) 2005-10-24 2015-08-11 Parkervision, Inc. Systems and methods of RF power transmission, modulation, and amplification
US9608677B2 (en) 2005-10-24 2017-03-28 Parker Vision, Inc Systems and methods of RF power transmission, modulation, and amplification
US10278131B2 (en) 2013-09-17 2019-04-30 Parkervision, Inc. Method, apparatus and system for rendering an information bearing function of time

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2239776A (en) * 1939-03-03 1941-04-29 Hazeltine Corp Balanced modulator circuit
US2275020A (en) * 1939-07-06 1942-03-03 John Hays Hammond Jr Modulation system
US2484107A (en) * 1946-09-21 1949-10-11 Du Mont Allen B Lab Inc Oscillograph circuit to modulate a signal

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2239776A (en) * 1939-03-03 1941-04-29 Hazeltine Corp Balanced modulator circuit
US2275020A (en) * 1939-07-06 1942-03-03 John Hays Hammond Jr Modulation system
US2484107A (en) * 1946-09-21 1949-10-11 Du Mont Allen B Lab Inc Oscillograph circuit to modulate a signal

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US2856586A (en) * 1953-08-13 1958-10-14 Gen Precision Lab Inc Mixer-modulator
US8781418B2 (en) 2004-10-22 2014-07-15 Parkervision, Inc. Power amplification based on phase angle controlled reference signal and amplitude control signal
US7327803B2 (en) 2004-10-22 2008-02-05 Parkervision, Inc. Systems and methods for vector power amplification
US9166528B2 (en) 2004-10-22 2015-10-20 Parkervision, Inc. RF power transmission, modulation, and amplification embodiments
US7184723B2 (en) 2004-10-22 2007-02-27 Parkervision, Inc. Systems and methods for vector power amplification
US8406711B2 (en) 2004-10-22 2013-03-26 Parkervision, Inc. Systems and methods of RF power transmission, modulation, and amplification, including a Cartesian-Polar-Cartesian-Polar (CPCP) embodiment
US8280321B2 (en) 2004-10-22 2012-10-02 Parkervision, Inc. Systems and methods of RF power transmission, modulation, and amplification, including Cartesian-Polar-Cartesian-Polar (CPCP) embodiments
US8233858B2 (en) 2004-10-22 2012-07-31 Parkervision, Inc. RF power transmission, modulation, and amplification embodiments, including control circuitry for controlling power amplifier output stages
US7421036B2 (en) 2004-10-22 2008-09-02 Parkervision, Inc. Systems and methods of RF power transmission, modulation, and amplification, including transfer function embodiments
US8428527B2 (en) 2004-10-22 2013-04-23 Parkervision, Inc. RF power transmission, modulation, and amplification, including direct cartesian 2-branch embodiments
US9197164B2 (en) 2004-10-22 2015-11-24 Parkervision, Inc. RF power transmission, modulation, and amplification, including direct cartesian 2-branch embodiments
US7466760B2 (en) 2004-10-22 2008-12-16 Parkervision, Inc. Systems and methods of RF power transmission, modulation, and amplification, including transfer function embodiments
US7526261B2 (en) 2004-10-22 2009-04-28 Parkervision, Inc. RF power transmission, modulation, and amplification, including cartesian 4-branch embodiments
US9197163B2 (en) 2004-10-22 2015-11-24 Parkvision, Inc. Systems, and methods of RF power transmission, modulation, and amplification, including embodiments for output stage protection
US7639072B2 (en) 2004-10-22 2009-12-29 Parkervision, Inc. Controlling a power amplifier to transition among amplifier operational classes according to at least an output signal waveform trajectory
US7647030B2 (en) 2004-10-22 2010-01-12 Parkervision, Inc. Multiple input single output (MISO) amplifier with circuit branch output tracking
US7672650B2 (en) 2004-10-22 2010-03-02 Parkervision, Inc. Systems and methods of RF power transmission, modulation, and amplification, including multiple input single output (MISO) amplifier embodiments comprising harmonic control circuitry
US9768733B2 (en) 2004-10-22 2017-09-19 Parker Vision, Inc. Multiple input single output device with vector signal and bias signal inputs
US7835709B2 (en) 2004-10-22 2010-11-16 Parkervision, Inc. RF power transmission, modulation, and amplification using multiple input single output (MISO) amplifiers to process phase angle and magnitude information
US20070116145A1 (en) * 2004-10-22 2007-05-24 Parkervision, Inc. Systems and methods of RF power transmission, modulation, and amplification, including transfer function embodiments
US7844235B2 (en) 2004-10-22 2010-11-30 Parkervision, Inc. RF power transmission, modulation, and amplification, including harmonic control embodiments
US9143088B2 (en) 2004-10-22 2015-09-22 Parkervision, Inc. Control modules
US8433264B2 (en) 2004-10-22 2013-04-30 Parkervision, Inc. Multiple input single output (MISO) amplifier having multiple transistors whose output voltages substantially equal the amplifier output voltage
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US7932776B2 (en) 2004-10-22 2011-04-26 Parkervision, Inc. RF power transmission, modulation, and amplification embodiments
US8913974B2 (en) 2004-10-22 2014-12-16 Parkervision, Inc. RF power transmission, modulation, and amplification, including direct cartesian 2-branch embodiments
US7945224B2 (en) 2004-10-22 2011-05-17 Parkervision, Inc. Systems and methods of RF power transmission, modulation, and amplification, including waveform distortion compensation embodiments
US8351870B2 (en) 2004-10-22 2013-01-08 Parkervision, Inc. Systems and methods of RF power transmission, modulation, and amplification, including cartesian 4-branch embodiments
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