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WO1996009690A1 - Circuit pour la compensation des effets de diaphonie aux entrees de melangeurs - Google Patents

Circuit pour la compensation des effets de diaphonie aux entrees de melangeurs Download PDF

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Publication number
WO1996009690A1
WO1996009690A1 PCT/DE1995/001238 DE9501238W WO9609690A1 WO 1996009690 A1 WO1996009690 A1 WO 1996009690A1 DE 9501238 W DE9501238 W DE 9501238W WO 9609690 A1 WO9609690 A1 WO 9609690A1
Authority
WO
WIPO (PCT)
Prior art keywords
signal
mixer
circuit
compensation
input
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.)
Ceased
Application number
PCT/DE1995/001238
Other languages
German (de)
English (en)
Inventor
Hermann Behrent
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.)
Sican Gesellschaft fur Silizium-Anwendungen und Cad/cat Niedersachsen Mbh
SICAN GmbH
Original Assignee
Sican Gesellschaft fur Silizium-Anwendungen und Cad/cat Niedersachsen Mbh
SICAN GmbH
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 Sican Gesellschaft fur Silizium-Anwendungen und Cad/cat Niedersachsen Mbh, SICAN GmbH filed Critical Sican Gesellschaft fur Silizium-Anwendungen und Cad/cat Niedersachsen Mbh
Publication of WO1996009690A1 publication Critical patent/WO1996009690A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C1/00—Amplitude modulation
    • H03C1/02—Details
    • H03C1/06—Modifications of modulator to reduce distortion, e.g. by feedback, and clearly applicable to more than one type of modulator

Definitions

  • the invention relates to a circuit arrangement for compensating the effects of crosstalk at inputs of mixers, which are used for frequency conversion in HF communication devices, e.g. m superimposed receivers and in particular m directly converting homodyne receivers can be used. It is a monolithically integrable compensation circuit for
  • the received signal is converted in a mixer using an oscillator signal (LO or converter signal).
  • LO oscillator signal
  • the spectrum of the received signal is thus shifted to another frequency range, so that a subsequent selection and amplification can be carried out in an economically sensible manner.
  • the crosstalk of the input signals to the LO input of a mixer significantly interferes with the frequency conversion, because undesired mixing products inextricably overlap the converted useful signal.
  • Linear intermodulation products result from the mixture of two or more undesired input signals, and nonlinear amplitude-proportional products arise, in particular from the mixture of the input signals with themselves.
  • the linear intermodulation products are only annoying if they happen to arise in the spectrum of the signal to be received, but the nonlinear amplitude-proportional products are always annoying in the case of directly converting homodyne receivers because they are inseparably superimposed on the converted baseband spectrum of the useful signal at the mixer output become.
  • Neutralization circuits are already known in amplifier circuits to avoid instability. In "Meinke-Gundlach, Taschenbuch der Hochfrequenz", for example, a circuit for neutralizing amplifier inputs is described, in which signals which act from the output to the input of the amplifier are damped by feedback.
  • DE 13 03 652 discloses a circuit arrangement for compensating the carrier residue at the output of push-pull and double push-pull modulators.
  • the compensation is carried out separately for the carrier signal and the useful signal.
  • the undesired modulation products are compensated for by generating them in a separate modulator and superimposing the useful signal on the output of the modulator.
  • the disadvantage of this circuit is that an additional modulator is required.
  • the compensation is carried out subsequently at the output. This means that only the linear mixed products can be compensated.
  • the non-linear mixed products that result from the multiplication carried out before the compensation at the mixer output cannot be eliminated.
  • DE 11 07 294 describes a high-frequency tuning device for superimposed receivers, in which an oscillator interference voltage reaches the primary circuit of the pot-type band band filter in two ways with a phase shift of 180 °.
  • this invention does not enable compensation of non-linear mixed products, especially non-periodic disturbances.
  • DE 12 89 138 discloses a method and a circuit arrangement for carrier residual compensation when generating carrier-frequency pulses.
  • the amount and phase of the carrier residue is compensated by a sinusoidal voltage derived from the residual carrier voltage present in the pulse pauses.
  • a carrier signal component one for
  • Residual carrier voltage proportional, sinusoidal voltage tapped at the filter output, its phase rotated by 180 ° and fed to an addition circuit. This circuit is needed
  • SPARE BLADE (RULE 26) Blanking gaps in which the compensation is carried out. It is suitable for compensating for the periodic carrier signal, but cannot be used to compensate for non-periodic and non-linear disturbances.
  • the usual method is used to compensate the carrier residue with a derived, phase-to-phase residual carrier voltage.
  • the circuits are suitable for compensating for periodic carrier residues.
  • the object of the invention is to compensate for undesired interspersed useful signals at the converter inputs of the mixers by an oppositely acting signal, so that the undesired linear and nonlinear mixed products are damped at the outputs.
  • the circuit arrangement consists of a mixer circuit, voltage or current dividers (dividers) and a phase shifter.
  • a first divider and a second divider are coupled to the first signal.
  • a portion of the first signal (first compensation signal) is impressed by the first divider and a further portion of the first signal (second compensation signal) is impressed on the second signal by the second divider.
  • the phase shifter which is connected either upstream of the second divider or to the tap of the second divider, causes a substantial orthogonal portion of the second compensation signal with respect to the first compensation signal.
  • the dividers must then be set exactly so that the sum of the components in magnitude and phase corresponds to the unwanted signal component which is phase-shifted by 180 ° and which is fed back to the second signal.
  • ERSATZBLAH REGEL26
  • the crosstalk of the useful signal from a mixer to the converter input is compensated for by the fact that a portion of the useful signal and an orthogonal portion of the useful signal are impressed into the converter input.
  • the signals are adapted by suitable adjustment in such a way that they have the opposite effect to the interference signal.
  • the invention was distinguished from the circuit arrangement known from German patent specification 1 289 138, which is only suitable for the compensation of periodic signals in that the original signal of the disturbance is tapped in the invention. A portion of this original signal and a portion orthogonal to it are impressed into the signal to be compensated. In the ideal case, the resulting proportion of compensation is also exactly 180 ° out of phase with respect to the disturbance. However, the compensation according to the invention is carried out by setting the proportions in such a way that their sum corresponds to the disturbance. It is therefore possible to eliminate not only periodic interference, but exactly the crosstalk of the interfering signal.
  • the division factors depend on the component tolerances and must be recalibrated during manufacture and, if necessary, during operation.
  • the invention makes it possible to compensate both the linear and the non-linear mixed products.
  • An important advantage is that the mixer can be integrated. This makes it possible to convert the mixer into a one-chip complete solution, e.g. for receiving modules and to manufacture them inexpensively in large quantities.
  • FIGS. 1 to 5. Show it:
  • Fig. 1 shows a symmetrical mixer
  • Fig. 2 the compensation circuit according to the invention of a symmetrical mixer.
  • ERSATZBLAF (RULE 26)
  • Fig. 3 the compensation circuit according to the invention of an asymmetrical mixer.
  • Fig. 4 representation of the compensation in the complex signal level.
  • 5 the compensation circuit according to the invention of two mixers using a common phase shifter.
  • Fig. 1 shows a balanced mixer (8) with two balanced signal inputs (4, 5 and 6, 7).
  • the input signal (1, 2) is fed to an amplifier (3) and fed to the signal input of the mixer (4, 5) as an amplified, symmetrical useful signal.
  • the symmetrical converter signal is generated with an oscillator (9) and fed to the converter input of the mixer (6, 7).
  • FIG. 2 shows the compensation circuit according to the invention of a symmetrical mixer (8), in which one of the symmetrical compensation signals experiences an additional phase shift through a phase shifter (12).
  • a signal component is tapped at each of the actuators (10, 11) and fed separately to one pole of the symmetrical converter input.
  • FIG. 3 shows the compensation circuit according to the invention of an asymmetrical mixer (16), in which one of the compensation signals undergoes an additional phase shift through a phase shifter (20).
  • a symmetrical compensation signal is generated by inserting the inverters (18, 21) and tapped at the actuators (19, 22). The two signal components are summed with the signal from the oscillator (17) and passed to the converter input.
  • two push-pull signals which are proportional to the input signals (4, 5 and 15) and are rotated by a phase shifter (12 or 20) with an essential orthogonal signal component, are generated on the voltage dividers (10, 11 and 19, 22).
  • the compensation signals are the symmetrical mixer (8) at the input for the converter signal, as in
  • the compensation is illustrated in FIG. 4 with a sketch of the signals in a vector representation.
  • the interference component at the converter input (23) is compensated for by the sum (24) of two signal components (25, 26) that are almost orthogonally out of phase with one another.
  • the compensation signals (25, 26) are proportional to the useful signal (27) and the almost orthogonally phase-shifted useful signal component (28). She has to go with them
  • Actuators are matched that the resulting signal (24) has the same amplitude but opposite phase position as the fault signal (23).
  • Fig. 5 shows the common compensation of two mixers (8, 38) according to the invention, as e.g. is used in homodyne receivers.
  • the phase shift is generated by a single common phase shifter circuit (12) and the compensation signals are each adjusted by separate signal dividers (10, 11 and 30, 31).
  • the compensation signals are added to the LO signal and to the quadrature signal derived therefrom by phase rotation (32).
  • a common integration of the mixer, the phase shifter and the oscillator together with all phase and frequency-determining components also offers a significant advantage over a circuit with external components.
  • the unwanted crosstalk of the input signal to the LO input of the mixer is then independent of the wiring and the adjustment to compensate for the LO input can already be set in production.
  • the oscillator is connected externally, a strongly scattering detuning of the geometric EMI optimization of the integrated circuits must be expected, so that a fixed setting of the compensation does not appear to make sense.

Landscapes

  • Noise Elimination (AREA)

Abstract

L'invention concerne des mélangeurs qui sont utilisés pour des changements de fréquence dans des appareils de communication HF. L'invention a pour but de réaliser la compensation de signaux utiles captés de façon indésirable aux entrées des convertisseurs des mélangeurs, par un signal agissant en sens opposé, de telle sorte que les produits de mélange linéaires et non linéaires non désirés soient atténués aux sorties. La compensation selon l'invention est réalisée par une compensation au moyen de deux signaux d'entrée mutuellement déphasés, présentant une composante de signal sensiblement orthogonale. Le système comprend un circuit de compensation monolithiquement intégrable, en vue de supprimer les produits de mélange linéaires et non linéaires non désirés, qui se forment par captage parasite du signal d'entrée, à l'entrée du convertisseur, et qui entraînent des interférences inséparables du signal utile à la sortie du mélangeur.
PCT/DE1995/001238 1994-09-20 1995-09-08 Circuit pour la compensation des effets de diaphonie aux entrees de melangeurs Ceased WO1996009690A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19944433478 DE4433478C2 (de) 1994-09-20 1994-09-20 Schaltungsanordnung zur Kompensation unerwünschter linearer und nichtlinearer Mischprodukte bei Mischern, die durch das Übersprechen eines ersten Signals auf ein zweites Signal entstehen
DEP4433478.8 1994-09-20

Publications (1)

Publication Number Publication Date
WO1996009690A1 true WO1996009690A1 (fr) 1996-03-28

Family

ID=6528685

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1995/001238 Ceased WO1996009690A1 (fr) 1994-09-20 1995-09-08 Circuit pour la compensation des effets de diaphonie aux entrees de melangeurs

Country Status (2)

Country Link
DE (1) DE4433478C2 (fr)
WO (1) WO1996009690A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19722792C1 (de) * 1997-05-30 1999-02-04 Hirschmann Richard Gmbh Co Hochentkoppeltes Hochfrequenz-Verteilnetz
GB2569800B (en) 2017-12-22 2022-09-07 Thermo Fisher Scient Bremen Gmbh Method and device for crosstalk compensation

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4163944A (en) * 1976-12-22 1979-08-07 Ncr Corporation Compensation circuit for an electrical signal mixer
US5343171A (en) * 1992-09-28 1994-08-30 Kabushiki Kaish Toshiba Circuit for improving carrier rejection in a balanced modulator

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1107294B (de) * 1959-12-17 1961-05-25 Telefunken Patent Hochfrequenzabstimmeinrichtung fuer UEberlagerungsempfaenger
DE1303652B (fr) * 1963-09-10 1972-05-31 Siemens Ag
DE1289138B (de) * 1966-08-03 1969-02-13 Siemens Ag Verfahren und Schaltugnsanordnung zur Traegerrestkompensation

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4163944A (en) * 1976-12-22 1979-08-07 Ncr Corporation Compensation circuit for an electrical signal mixer
US5343171A (en) * 1992-09-28 1994-08-30 Kabushiki Kaish Toshiba Circuit for improving carrier rejection in a balanced modulator

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
TON ET AL.:: "An X-band monolithic double double-balanced mixer for high dynamic receiver application", IEEE MTT-S INTERNATIONAL MICROWAVE SYMPOSIUM DIGEST, 8 May 1990 (1990-05-08) - 10 May 1990 (1990-05-10), NEW YORK, USA, pages 197 - 200 *

Also Published As

Publication number Publication date
DE4433478C2 (de) 1997-07-03
DE4433478A1 (de) 1996-03-28

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