DE3344318C1 - Frequency converter with a circuit arrangement for suppressing an oscillator signal in the output signal of a mixer - Google Patents
Frequency converter with a circuit arrangement for suppressing an oscillator signal in the output signal of a mixerInfo
- Publication number
- DE3344318C1 DE3344318C1 DE19833344318 DE3344318A DE3344318C1 DE 3344318 C1 DE3344318 C1 DE 3344318C1 DE 19833344318 DE19833344318 DE 19833344318 DE 3344318 A DE3344318 A DE 3344318A DE 3344318 C1 DE3344318 C1 DE 3344318C1
- Authority
- DE
- Germany
- Prior art keywords
- signal
- mixer
- output
- oscillator
- oscillator signal
- 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
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
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
- H03D2200/00—Indexing scheme relating to details of demodulation or transference of modulation from one carrier to another covered by H03D
- H03D2200/0041—Functional aspects of demodulators
- H03D2200/009—Reduction of local oscillator or RF leakage
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Superheterodyne Receivers (AREA)
- Noise Elimination (AREA)
Abstract
The invention is based on a frequency converter with a circuit arrangement for suppressing an oscillator signal in the output signal of a mixer from a radio-frequency input signal and an oscillator signal. The circuit arrangement consists in that a signal component is coupled out of the oscillator signal (OZ) applied to the mixer (M) and is superimposed on the output signal of the mixer so that this signal component compensates for the oscillator signal in the mixed product (Figure 1). <IMAGE>
Claims (1)
sen anderem Eingang das Oszillatorsignal anliegt, · Der in F i g. 1 dargestellte Frequenzumsetzer enthält dadurch gekennzeichnet, daß ein erster einen Mischer Mund einen daran angeschlossenen Os-Koppler (K 1) aus dem an den anderen Eingang ge- ίο zillator O. Dieser Mischer M, hier ist es z. B. ein Auflegten Oszillatorsignal (OZ) einen Signalanteil aus- wärtsmischer, erzeugt an seinem Ausgang ein Mischkoppelt, daß dieser Signalanteil über ein Dämp- produkt aus dem Oszillatorsignal OZ und einem an seifungsglied (D) und einen Phasenschieber (P) an ei- nem Eingang liegenden Zwischenfrequenzsignal ZF. nen zweiten an den Mischerausgang geschalteten Das Frequenzspektrum des Mischprodukts zeigt die Koppler (K 2) gelangt, der den ausgekoppelten Si- 15 Fi g. 2; es besteht aus dem oberen Seitenband der Fregnal-Anteil des Oszillatorsignals dem Ausgangssi- quenz foz + fzF, dem unteren Seitenband foz — fzF und gnal des Mischers (M) überlagert, und daß das dem Oszillatorsignal mit der Frequenz foz, wobei fzF die Dämpfungsglied (D) und der Phasenschieber (P) so Frequenz des Zwischenfrequenzsignals ist.
eingestellt sind, daß der ausgekoppelte Anteil des Das in dem Mischprodukt auftretende Oszillatorsi-A high-frequency signal at an input and a mixed product appearing at the mixer,
sen other input the oscillator signal is present, · The in F i g. 1 contains the frequency converter shown, characterized in that a first mixer mouth an Os coupler (K 1) connected to it from the zillator O connected to the other input. This mixer M, here it is z. B. an applied oscillator signal (OZ) a signal component outward mixer, generates a mixing coupling at its output that this signal component via a damping product from the oscillator signal OZ and a soaping element (D) and a phase shifter (P) to one Input lying intermediate frequency signal ZF. nen second connected to the mixer output The frequency spectrum of the mixed product shows the coupler (K 2) arrives, which the decoupled Si 15 Fi g. 2; It consists of the upper sideband of the frequency component of the oscillator signal superimposed on the output sequence foz + fzF, the lower sideband foz - fzF and gnal of the mixer (M) , and that this is superimposed on the oscillator signal with the frequency foz, where fzF is the attenuator ( D) and the phase shifter (P) is the frequency of the intermediate frequency signal.
are set so that the decoupled portion of the oscillator occurring in the mixed product
erforderlich. Da Filter immer gewisse Signalverzerrun- 45
gen hervorrufen, sollte man die Zahl der Filter möglichst gering halten.very complex filters with steep slopes
necessary. Since filters always have a certain amount of signal distortion 45
genes, the number of filters should be kept as low as possible.
ein Anteil des einen Mischereingangssignals nach einer
90° Phasenverschiebung mit dem anderen ebenfalls um
90° phasenverschobenen Mischereingangssignal in einem zweiten Mischer multipliziert und das Ausgangssignal dieses zweiten Mischers dem Ausgangssignal des 55
ersten Mischers überlagert. Ein Nachteil dieser recht
aufwendigen Schaltungsanordnung ist, daß zusätzlich
zum ersten Mischer auch noch der zweite Mischer unerwünschte Mischprodukte liefert.From DE-OS 23 61 546 a circuit arrangement is known for suppressing one of the two mixed products produced in a mixer. In addition, 50
a portion of a mixer input signal after a
90 ° phase shift with the other also by
90 ° phase-shifted mixer input signal is multiplied in a second mixer and the output signal of this second mixer is matched to the output signal of the 55th mixer
first mixer superimposed. A disadvantage of this right
complex circuit arrangement is that in addition
In addition to the first mixer, the second mixer also delivers undesired mixed products.
Frequenzumsetzer mit einer Schaltungsanordnung der
eingangs genannten Art anzugeben, die mit einfachen,
möglichst wenig Störungen verursachenden Schaltungsteilen zum Unterdrücken des Oszillatorsignals
realisiert ist. 65The invention is now based on the object of providing a 60
Frequency converter with a circuit arrangement of
to specify the type mentioned at the beginning, which is with simple,
Circuit parts causing as little interference as possible to suppress the oscillator signal
is realized. 65
Kennzeichen des Anspruchs aufgeführten Merkmale
gelöst.According to the invention, this object is achieved by the im
Characteristics of the claim listed features
solved.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19833344318 DE3344318C1 (en) | 1983-12-08 | 1983-12-08 | Frequency converter with a circuit arrangement for suppressing an oscillator signal in the output signal of a mixer |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19833344318 DE3344318C1 (en) | 1983-12-08 | 1983-12-08 | Frequency converter with a circuit arrangement for suppressing an oscillator signal in the output signal of a mixer |
Publications (1)
Publication Number | Publication Date |
---|---|
DE3344318C1 true DE3344318C1 (en) | 1985-05-15 |
Family
ID=6216304
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19833344318 Expired DE3344318C1 (en) | 1983-12-08 | 1983-12-08 | Frequency converter with a circuit arrangement for suppressing an oscillator signal in the output signal of a mixer |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE3344318C1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0243733A2 (en) * | 1986-04-22 | 1987-11-04 | ANT Nachrichtentechnik GmbH | Method and system for the regulation of a single side band up-converter |
EP0338125A1 (en) * | 1988-04-20 | 1989-10-25 | Hewlett-Packard Company | Method and apparatus for nulling local oscillator feedthrough |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2361546A1 (en) * | 1972-12-20 | 1974-06-27 | Cit Alcatel | FREQUENCY TOTALIZING DEVICE |
-
1983
- 1983-12-08 DE DE19833344318 patent/DE3344318C1/en not_active Expired
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2361546A1 (en) * | 1972-12-20 | 1974-06-27 | Cit Alcatel | FREQUENCY TOTALIZING DEVICE |
Non-Patent Citations (2)
Title |
---|
"Modulation und Demodulation" Elitera-Verlag 1975,S.56,57 * |
IRE Transactions on Circuit Theory, No.2, 1957, June, Vol.CT-4, S.41-53 * |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0243733A2 (en) * | 1986-04-22 | 1987-11-04 | ANT Nachrichtentechnik GmbH | Method and system for the regulation of a single side band up-converter |
EP0243733A3 (en) * | 1986-04-22 | 1989-04-12 | Ant Nachrichtentechnik Gmbh | Method and system for the regulation of a single side band up-converter |
EP0338125A1 (en) * | 1988-04-20 | 1989-10-25 | Hewlett-Packard Company | Method and apparatus for nulling local oscillator feedthrough |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
8100 | Publication of the examined application without publication of unexamined application | ||
D1 | Grant (no unexamined application published) patent law 81 | ||
8363 | Opposition against the patent | ||
8331 | Complete revocation |