WO1993007677A1 - Agencement de filtres - Google Patents

Agencement de filtres Download PDF

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Publication number
WO1993007677A1
WO1993007677A1 PCT/EP1992/002196 EP9202196W WO9307677A1 WO 1993007677 A1 WO1993007677 A1 WO 1993007677A1 EP 9202196 W EP9202196 W EP 9202196W WO 9307677 A1 WO9307677 A1 WO 9307677A1
Authority
WO
WIPO (PCT)
Prior art keywords
filter
frequency range
sub
mhz
partial
Prior art date
Application number
PCT/EP1992/002196
Other languages
German (de)
English (en)
Inventor
Gerhard Maier
Veit Armbruster
Original Assignee
Deutsche Thomson-Brandt 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 Deutsche Thomson-Brandt Gmbh filed Critical Deutsche Thomson-Brandt Gmbh
Publication of WO1993007677A1 publication Critical patent/WO1993007677A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J5/00—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner
    • H03J5/24—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with a number of separate pretuned tuning circuits or separate tuning elements selectively brought into circuit, e.g. for waveband selection or for television channel selection
    • H03J5/246—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with a number of separate pretuned tuning circuits or separate tuning elements selectively brought into circuit, e.g. for waveband selection or for television channel selection using electronic means
    • 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
    • H04B1/26—Circuits for superheterodyne receivers

Definitions

  • the present invention relates to a filter arrangement according to the preamble of claim 1.
  • filters are also used in addition to preamplifier stages and regulator stages, which filter out and pass on individual sections of this frequency range to be received.
  • Such systems first convert the received high-frequency signal from the received frequency range into a first intermediate frequency with a higher frequency, which is, for example, in the range of 2 GHz.
  • filters influence to a large extent the reception quality of the television signals received. It is known to implement such filters as so-called octave filters. Filter stages are arranged in parallel, the pass ranges of the individual filter stages complementing each other and the upper pass frequency of each filter is approximately twice as high as its lower pass frequency.
  • the last filter stage of an octave filter is designed in such a way that it passes the range from 450 MHz to 900 MHz.
  • Such a large passband is, however, insufficient for many reception conditions. It is the object of the present invention to design a filter arrangement for a high-frequency receiver with double conversion in such a way that, with low insertion loss, interference, such as intermodulation interference in particular, is largely avoided.
  • a filter arrangement is provided in the input stage of a double converter receiver, such as is used for television receivers, for example, which consists of controllable partial filters.
  • a single filter is provided in each of these branches, the pass band of which is controlled by capacitance diodes.
  • controllable partial filters especially in comparison with the octave filters mentioned, large amounts of nonlinearities can be avoided, the selection can be increased, and a small insertion loss can be realized.
  • the signal / noise ratio of the input stage can be improved in conjunction with preamplifier stages and pin diode controllers.
  • Another advantage of the invention is that interference radiation emitted by a local oscillator which is assigned to a first mixer is kept away from the antenna input of a receiver.
  • Amplifier, controller, etc. arranged that has the particular
  • Figure 1 is a block diagram of a preferred embodiment example of an input stage using a double filter.
  • Fig. 2 shows the circuit diagram of a preferred embodiment
  • FIG. 1 shows the block diagram of a preferredisersbei game.
  • a radio frequency signal for example a television signal L
  • the antenna 10 is connected directly to the input 20 of a filter 11, which consists of a first single-circuit partial filter 11a with a downstream first switch 11b and a second single-circuit partial filter 11c with a downstream second switch 11d.
  • the first sub-filter 11a is provided for a first sub-frequency range from approximately 45 MHz to 230 MHz and the second sub-filter 11 c for a second sub-frequency range from approximately 230 MHz to 860 MHz.
  • the output 40 of the filter 11 is connected to the input of a preamplifier 12, which in this exemplary embodiment is designed as a broadband amplifier and has an output resistance of 75 ohms.
  • the amplifier 12 outputs its output signal to the input of an attenuator 13, which is designed here as a pin diode controller 13, which can be implemented in a T or in a Pi arrangement. However, the pi arrangement is preferred to reduce the series resistance.
  • the output of the Pindiodereglers 13 is connected to further, known stages of a double converter receiver, such as a mixer 14 for the first intermediate frequency, which in this embodiment has an input resistance of 75 ohms, a further filter 15 and a second mixer 16 for the second intermediate frequency.
  • a double converter receiver such as a mixer 14 for the first intermediate frequency, which in this embodiment has an input resistance of 75 ohms, a further filter 15 and a second mixer 16 for the second intermediate frequency.
  • the signal emitted by these stages 14,... 16 is further processed by stages, not shown. These stages should not be discussed further at this point because they are known per se.
  • the pin diode regulator 13 has an input resistance and an output resistance with a value of 75 ohms.
  • the first filter 11a is controlled by a control device 17 by means of a control signal A and thereupon changes its filter characteristic. Furthermore, the control device 17 controls the first switch 11b by means of a control signal B.
  • the second filter 11c and the second switch 11d are controlled by the control device 17 by means of control signals A 1 and B '.
  • the control device 17 itself is connected to means (not shown) via which the frequency range to be selected can be determined, for example by a television viewer.
  • the filter effect is controlled by the control unit 17, which controls both the individual filters 11a, 11c and thus determines their passband, and controls the switches 11b, 11d, the positions of which connect the required individual filter 11a or 11c to the output of the filter 11 .
  • the circuit diagram in FIG. 2 shows a preferred embodiment of the filter 11.
  • the received high-frequency signal is coupled via the input 20 to a first coupling element 100 consisting of a coil 21 which is damped by a resistor 22 and a coupling capacitor 23. a tap of a coil 24 supplied. This has one end connected to ground and the other end is connected to the anode of a first capacitance diode 25, the cathode of which is connected to the cathode of a second capacitance diode 26 and the cathode of a third capacitance diode 27. The anode of the second capacitance diode 26 is connected to ground switched.
  • the anode of the third capacitance diode 27 is connected via a further coupling capacitor to the switching input of the switch 11b, which in this exemplary embodiment is designed as a diode switch and has the first switching diode 29.
  • This switch 11b is controlled by the control signal B, which is designed here as a DC voltage signal.
  • the high-frequency signal present at input 20 is conducted via a second input decoupler Igli ed 101, which consists of a coupling capacitor 30 and a fourth capacitance diode 31. Its anode is connected to a tap of a coil 32, the first end of which is connected to ground and the second end of which is connected to the anode of a fifth capacitance diode 33.
  • the cathode of the diode 33 is led to the cathode of a sixth capacitance diode 34 and to the first end of a coil 35. This coil 35 is damped via a damping resistor 35a.
  • the signal present at the second end of the coil 35 is fed via a further coupling capacitor to the switching input of the switch 11d, which is also designed as a diode switch and has the two diodes 36 and 37.
  • the switch 11d is controlled by the control device 17 by means of the signal B '.
  • the components 27, 28, 29 form a first output decoupler 102 and the components 35, 35a, 36, 37, 38 form a second output decoupler 103.
  • the C 1 / C 28 ratio is defined as the capacitance value at 1 volt in relation to that at 28 volt reverse voltage.
  • the filter 11 can be arranged after the preamplifier 12 or after the pin diode controller 13;
  • another high-frequency signal source such as a broadband cable, can be provided;
  • switches 11b, 11d switches can be arranged in front of the individual filters 11a, 11c.
  • a filter arrangement for a receiver with double conversion which consists of parallel circuits.
  • suitable components for example capacitance diodes, it is possible to process a wide frequency range, for example from 45 MHz to 860 MHz, with only two individual circuits connected in parallel.
  • the filter arrangement according to the invention is preferably suitable for a receiver, for example for a television set, with double conversion, the invention is not restricted to such use.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Filters And Equalizers (AREA)
  • Superheterodyne Receivers (AREA)

Abstract

Dans des agencements de filtres connus pour récepteurs à double conversion se produisent de plus en plus de perturbations d'intermodulation et de non-linéarités. Dans l'agencement de filtres selon l'invention, deux filtres individuels ont été montés en parallèle. Grâce à un choix adéquat de composants, tels que des diodes de capacité avec des valeurs caractéristiques prédéterminées, on a réussi à couvrir la gamme de fréquence de 45 MHz à 860 MHz avec seulement deux filtres individuels. La présente invention peut être appliquée de préférence à des récepteurs de télévision à double conversion.
PCT/EP1992/002196 1991-10-04 1992-09-23 Agencement de filtres WO1993007677A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19914132907 DE4132907A1 (de) 1991-10-04 1991-10-04 Filteranordnung
DEP4132907.4 1991-10-04

Publications (1)

Publication Number Publication Date
WO1993007677A1 true WO1993007677A1 (fr) 1993-04-15

Family

ID=6442033

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1992/002196 WO1993007677A1 (fr) 1991-10-04 1992-09-23 Agencement de filtres

Country Status (2)

Country Link
DE (1) DE4132907A1 (fr)
WO (1) WO1993007677A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09121138A (ja) * 1995-08-24 1997-05-06 Fujitsu Ltd フィルタ装置及びこれを用いた無線装置
TW325607B (en) * 1995-08-24 1998-01-21 Fujitsu Ltd Filter device and dual-band radio system in which the filter device is used

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3903487A (en) * 1974-05-01 1975-09-02 Gte International Inc Multi-circuit selection filter for two different frequency ranges
EP0145076A2 (fr) * 1983-12-05 1985-06-19 North American Philips Consumer Electronics Corp. Circuit d'entrée d'un récepteur de télévision
EP0429914A2 (fr) * 1989-12-01 1991-06-05 TEMIC TELEFUNKEN microelectronic GmbH Circuit d'accord

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL175575C (nl) * 1976-05-28 1984-11-16 Philips Nv Filter- en demodulatie-inrichting.
IT1071537B (it) * 1976-10-25 1985-04-10 Indesit Dispositivo per la sintonizzazione di un televisione
FI75962C (fi) * 1982-03-30 1988-08-08 Rca Corp Avstaemningssystem foer en flerbandig televisionsmottagare.
US4555809A (en) * 1983-10-26 1985-11-26 Rca Corporation R.F. Diplexing and multiplexing means
DE3507865A1 (de) * 1985-03-06 1986-09-11 Philips Patentverwaltung Gmbh, 2000 Hamburg Schaltungsanordnung fuer einen tuner zur umschaltung mehrerer frequenzbereiche
JPH0389720A (ja) * 1989-09-01 1991-04-15 Pioneer Electron Corp ラジオ受信機
US5115317A (en) * 1989-12-22 1992-05-19 Alps Electric Co., Ltd. Tuning apparatus for a television receiver including selectively activated amplifier and local oscillator circuits

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3903487A (en) * 1974-05-01 1975-09-02 Gte International Inc Multi-circuit selection filter for two different frequency ranges
EP0145076A2 (fr) * 1983-12-05 1985-06-19 North American Philips Consumer Electronics Corp. Circuit d'entrée d'un récepteur de télévision
EP0429914A2 (fr) * 1989-12-01 1991-06-05 TEMIC TELEFUNKEN microelectronic GmbH Circuit d'accord

Also Published As

Publication number Publication date
DE4132907A1 (de) 1993-04-08

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