CN1081409C - Long-wave signal and medium-wave signal receiver circuit - Google Patents
Long-wave signal and medium-wave signal receiver circuit Download PDFInfo
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- CN1081409C CN1081409C CN97116610A CN97116610A CN1081409C CN 1081409 C CN1081409 C CN 1081409C CN 97116610 A CN97116610 A CN 97116610A CN 97116610 A CN97116610 A CN 97116610A CN 1081409 C CN1081409 C CN 1081409C
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Abstract
To provide a small receiver circuit for a long wave signal and a medium wave signal at a low cost by simplifying the circuit configuration for local oscillation signals in the case of receiving a long wave signal so as to reduce the number of components. The circuit is provided with a 1st resonance circuit tuned to a medium wave signal, a 2nd resonance circuit connected in series with the 1st resonance circuit and tuned to a long wave signal, a 3rd resonance circuit tuned to a local oscillation signal, a 1st switch element 51 connected in parallel with the 2nd resonance circuit, a series circuit consisting of a capacitor 45 and a 2nd switch element 52 in parallel connection to the 3rd resonance circuit and a switch control section which closes the 1st switch element 51 in the case of receiving the medium wave signal, opens the 2nd switch element 52, opens the 1st switch element 51 in the case of receiving the long wave signal and closes the 2nd switch element 52.
Description
The present invention relates to a kind of long-wave signal and medium wave signal receiving circuit, can select to switch the reception of these two kinds of signals.Particularly when utilizing the switching circuit contain switch element,, simplified the formation of the switching circuit of local oscillation loop one side to the occasion that long-wave signal and medium wave signal receiving circuit are switched.
The broadcasting frequency scope of Europe regulation medium wave signal is that the broadcasting frequency scope of 522～1611kHz, long-wave signal is 153～281kHz.Like this, in the time will receiving medium wave signal and long-wave signal, will use radio receiver with long-wave signal and medium wave signal receiving circuit with a radio receiver.
When the broadcast receiver with such long-wave signal and medium wave signal receiving circuit receives long-wave signal or medium wave signal, become these signals the intermediate frequency signal of 450kHz at frequency converter.When carrying out this frequency translation, the medium wave signal of 522～1611kHz broadcasting frequency scope mixes mutually with the oscillation signals according of 972～2061kHz frequency; The long-wave signal of 153～281kHz broadcasting frequency scope mixes mutually with the oscillation signals according of 603～731kHz frequency.
As shown in Figure 2, transformer 1 is a medium wave signal input transformer, has the 1st winding the 11, the 2nd winding 12 and the 3rd winding 13; Transformer 2 is long-wave signal input transformers, has the 1st winding 21 and has tapped the 2nd winding 22; Transformer 3 is medium wave signal local oscillation coupling transformers, has the 1st winding 31 and the 2nd winding 32; Transformer 4 is long-wave signal local oscillation coupling transformers, has the 1st winding 41 and the 2nd winding 42.The 1st winding 11, one ends connect antenna input 5, and the other end connects the centre tap of the 2nd winding 22.The 2nd winding 12, one ends are by capacitor 14 ground connection, simultaneously again by the 1st variable capacitance diode 15 and capacitor 16 ground connection; The other end links to each other with an end of the 2nd winding 22.The tie point of the 1st variable capacitance diode 15 and capacitor 16 links to each other with tuning voltage supply terminal 8 by resistance 17.The 3rd winding 13, one ends link to each other other end ground connection with an end of medium wave signal output terminal 6 and the 1st winding 21.The other end of the 1st winding 21 links to each other with long-wave signal lead-out terminal 7.The 2nd winding 22 is with capacitor 23 parallel connections, and the end that same the 2nd winding 12 is connected, by collector electrode, the grounded emitter of the 1st switching transistor 51, its other end is ground connection also.The 1st winding 31, one ends link to each other with the other end by capacitor 33, simultaneously by capacitor 34 and resistance 35 ground connection, and the tie point of capacitor 34 and resistance 35, by the 2nd variable capacitance diode 36, the tie point of the 1st variable capacitance diode 15 and capacitor 16 links to each other together; The other end links to each other by the end of capacitor 43 with the 1st winding 41, passes through collector electrode, the grounded emitter of the 2nd switching transistor 52 simultaneously.The 2nd winding 32, one ends link to each other with local oscillation sound feeding terminal 9, and the other end links to each other with an end of the 2nd winding 42.The 1st winding 41, one ends link to each other with the other end by capacitor 44, and the other end is by collector electrode, the grounded emitter of the 3rd switching transistor 53.The other end of the 2nd winding 42 links to each other with standard DC power supply feeding terminal 10.The 1st switching transistor 51, base stage links to each other with power supply terminal 61 with resistance 55 by resistance 54; The 2nd switching transistor 52, base stage links to each other with the tie point of resistance 54 with resistance 55 by resistance 56.The 3rd switching transistor 53, base stage links to each other by resistance 57 same medium waves/long wave switching signal terminal 62.
The long-wave signal of above-mentioned formation and medium wave signal receiving circuit, its action is as follows:
At first, when receiving the medium wave signal, provide the switching signal of negative polarity or earthing potential by medium wave/long wave switching signal terminal 62.Because this switching signal disconnects the 3rd switching transistor 53, the 1st switching transistor 51 and the 2nd switching transistor 52 are connected.So because the connection of the 1st switching transistor 51, an end ground connection of the 2nd winding 22 of the other end of the 2nd winding 12 of transformer 1 and transformer 2 is communicated with; Because the connection of the 2nd switching transistor 52, the other end ground connection of the 1st winding 31 of transformer 3 is communicated with; Because the disconnection of transistor 53, the ground connection of the other end of the 1st winding 41 of transformer 4 disconnects.
During this state, the 2nd winding 12 of transformer 1, capacitor the 14, the 1st variable capacitance diode 15, capacitor 16 constitute the 1st oscillation circuit of the medium wave signal tuning that antenna input 5 is introduced; The 1st winding 31 of transformer 3, capacitor 33, capacitor the 34, the 2nd variable capacitance diode 36, capacitor 16 constitute 3rd oscillation circuit tuning to the oscillation signals according that is transmitted by oscillation signals according feeding terminal 9.Like this, if supply with tuning voltage feeding terminal 8 needed tuning voltage, this tuning voltage just puts on the negative electrode of the 1st variable capacitance diode 15 and the 2nd variable capacitance diode 36 by resistance 17, the capability value of the capability value of the 1st variable capacitance diode 15 and the 2nd variable capacitance diode 36, all corresponding respectively tuning voltage numerical value that is applied that changes to.At this moment, a certain receiving signal tuning of the 1st oscillation circuit same frequency 522～1611kHz, the 2nd oscillation circuit is corresponding with the tuned frequency of the 1st oscillation circuit, and a certain oscillation signals according of same frequency 972～2061kHz is tuning.Its result, received signal just output to medium wave signal output terminal 6 from the 3rd winding 13 of transformer 1, supply with and do not give illustrated mixed circuit.Mix mutually with oscillation signals according in the mixed circuit received signal, both difference on the frequencies just generate the intermediate frequency signal of 450kHz.
On the other hand, when receiving long-wave signal, provide the switching signal of positive polarity by medium wave/long wave switching signal terminal 62.Because this switching signal is connected the 3rd switching transistor 53, the 1st switching transistor 51 and the 2nd switching transistor 52 disconnect.So, because the disconnection of the 1st switching transistor 51, the other end of the 2nd winding 12 of transformer 1, disconnect with the ground connection of an end of the 2nd winding 22 of transformer 2, because the disconnection of the 2nd switching transistor 52, the ground connection of the other end of the 1st winding 31 of transformer 3 disconnects, because the connection of the 3rd switching transistor 53, the other end ground connection of the 1st winding 41 of transformer 4 is communicated with.
During this state, the 2nd winding 22 of transformer 2, capacitor 23 with the 1st oscillation circuit together, constitute the 2nd tuning oscillation circuit of long-wave signal that antenna input 5 is introduced; The 1st winding 41 of transformer 4, capacitor 43,44 with the 3rd oscillation circuit together, constitute the 4th tuning oscillation circuit of oscillation signals according that oscillation signals according feeding terminal 9 is transmitted.Like this, if supply with tuning voltage feeding terminal 8 needed tuning voltage, this tuning voltage just puts on the negative electrode of the 1st variable capacitance diode 15 and the 2nd variable capacitance diode 36 by resistance 17, the capability value of the capability value of the 1st variable capacitance diode 15 and the 2nd variable capacitance diode 36, all respectively respective change to the numerical value of the tuning voltage that is applied.At this moment, the receiving signal tuning of a certain frequency of the 2nd oscillation circuit same frequency 153～281kHz, the 4th oscillation circuit is corresponding with the tuned frequency of the 2nd oscillation circuit, and a certain local oscillation frequency of same frequency 603～731kHz is tuning.Its result, received signal just output to long-wave signal lead-out terminal 7 from the 1st winding 21 of transformer 2, supply with and do not give illustrated mixed circuit.Mix mutually with oscillation signals according in the mixed circuit received signal, both difference on the frequencies just generate the intermediate frequency signal of 450kHz.
So in the past long-wave signal and medium wave signal receiving circuit when receiving long-wave signal, must be provided with transformer 4, utilize its 1st winding 41 and the 2nd winding 42, transmit oscillation signals according.Moreover, also must connect the 2nd switching transistor 52,, the 1st winding 41 of transformer 4 be worked or inoperative so that when receiving long-wave signal or medium wave signal.Therefore, the problem of existence is: the circuit of oscillation signals according one side constitute complicated, composed component quantity is many, cost is high, miniaturization difficulty etc.
It is target that the present invention is exactly to address the above problem, and the circuit of simplifying oscillation signals according one side when receiving long-wave signal constitutes, and provides that a kind of composed component quantity is few, cost is low, can realize the long-wave signal and the medium wave signal receiving circuit of miniaturization.
For achieving the above object, long-wave signal of the present invention and medium wave signal receiving circuit, on 3rd oscillation circuit tuning to the oscillation signals according of medium wave signal, the capacitor of a parallel connection of configuration, and make it the switching that can switch on and off.With the 3rd oscillation circuit that comprises this capacitor, replace 4th oscillation circuit tuning to the oscillation signals according of long-wave signal.When receiving the medium wave signal, make this capacitor be off-state with the 3rd oscillation circuit; And when receiving long-wave signal, make this capacitor be on-state with the 3rd oscillation circuit.
By above-mentioned measure, only on 3rd oscillation circuit tuning to the oscillation signals according of medium wave signal, the capacitor that can select on-state or off-state in parallel is configured long-wave signal and the medium wave signal receiving circuit of simplifying with greatly with regard to the circuit that has obtained oscillation signals according one side.
In example of the present invention, long-wave signal and medium wave signal receiving circuit include: the 1st oscillation circuit, to the medium wave signal tuning; The 2nd oscillation circuit, with the series connection of the 1st oscillation circuit, tuning to long-wave signal; The 3rd oscillation circuit, tuning to oscillation signals according; The 1st switch element is with the 2nd oscillation circuit parallel connection; Capacitor, the 2nd switch element and series circuit thereof are with the 3rd oscillation circuit parallel connection; On-off controller when receiving the medium wave signal, disconnects the connection of the 1st switch element, the 2nd switch element; When receiving long-wave signal, the disconnection of the 1st switch element, the 2nd switch element are connected.
As preferred embodiment of the present invention, the 1st switch element and the 2nd switch element are respectively switching transistor, and their base stage is accepted the complementary transitions signal that sent by on-off controller respectively.
According to example of the present invention, when receiving the medium wave signal, this receiving loop in the past is the same together, and the circuit of the 3rd oscillation circuit as oscillation signals according one side used, and is tuning to the oscillation signals according of medium wave signal; On the other hand, when receiving long-wave signal, the 4th oscillation circuit that the 3rd oscillation circuit is formed in parallel with capacitor uses as the circuit of oscillation signals according one side.So when alternately receiving long-wave signal or medium wave signal, the circuit of local oscillation loop one side selects off-state or on-state just to be enough to constitute with the capacitor of the same parallel connection of the 3rd oscillation circuit.Compare with this receiving circuit in the past, the circuit of oscillation signals according one side constitutes greatly to be simplified, and composed component quantity reduces, and cost reduces, and will become possibility to miniaturization.
Fig. 1 is the circuit diagram according to an embodiment of long-wave signal of the present invention and medium wave signal receiving circuit.
Fig. 2 be exactly in the past long-wave signal and the circuit diagram of an example constituting of medium wave signal receiving circuit.
Below, to embodiments of the invention, be illustrated with reference to diagram.
In the middle of Fig. 1, the identical person of composed component all with shown in Figure 2 is with identical code name mark.
The long-wave signal of this present embodiment and medium wave signal are accepted circuit (hereinafter referred to as ＂ present embodiment circuit ＂), (hereinafter referred to as ＂ circuit ＂ in the past) compares with in the past long-wave signal and medium wave signal receiving circuit, as the following stated, the circuit of oscillation signals according one side of long-wave signal formation differs widely; And the part that the circuit of on-off controller one side constitutes is also inequality.In addition, circuit constitutes constant.
See difference earlier: the circuit about oscillation signals according one side of long-wave signal constitutes, and circuit had transformer 4 and two capacitors 43,44 in the past, and the present embodiment circuit has only 1 capacitor 45; Circuit about on-off controller one side constitutes, and circuit had the 2nd switching transistor 52 and the 3rd switching transistor 53 in the past, and the present embodiment circuit has the 2nd switching transistor 52 and inverter 58.
Specifically, in the present embodiment circuit, an end of capacitor 45 links to each other with an end of the 1st winding 31 of transformer 3; The other end of capacitor 45, continuous with the collector electrode of the 2nd switching transistor 52.The emitter of the other end of the 1st winding 31 and the 2nd switching transistor 52 is ground connection respectively.The base stage of the 2nd switching transistor 52, by resistance 57, same medium wave/long wave switching signal terminal 62 links to each other.Inverter 58, the same medium wave of input/long wave switching signal terminal 62 links to each other, and output links to each other by the base stage of resistance 54 with the 1st switching transistor 51.
Connect the present embodiment circuit of above-mentioned formation, its action is as follows.
When receiving the medium wave signal, medium wave/long wave switching signal terminal 62, the switching signal of negative polarity or earthing potential.Because the effect of this switching signal disconnects the 2nd switching transistor 52; The 1st switching transistor 51 is connected owing to inverter 58 makes the polarity inversion of switching signal.So, because the connection of the 1st switching transistor 51, an end ground connection of the 2nd winding 12 of transformer 1 is communicated with, because the disconnection of the 2nd switching transistor 52, the other end ground connection of capacitor 45 disconnects, and the connection of capacitor 45 of an end of the 1st winding 31 of leading to transformer 3 is invalid.
When being in this state, with circuit was the same in the past, the 2nd winding 12 of transformer 1, capacitor the 14, the 1st variable capacitance diode 15, capacitor 16 just constitute the 1st oscillation circuit of the medium wave signal tuning that antenna input 5 is introduced; The 1st winding 31 of transformer 3, capacitor the 33,34, the 2nd variable capacitance diode 36, capacitor 16, just constitute the 3rd tuning oscillation circuit of oscillation signals according that oscillation signals according feeding terminal 9 is transmitted.Like this, if supply with the required tuning voltage of tuning voltage feeding terminal 8, this tuning voltage just puts on the negative electrode of the 1st variable capacitance diode 15 and the 2nd variable capacitance diode 36 by resistance 17, the capability value of the capability value of the 1st variable capacitance diode 15 and the 2nd variable capacitance diode 36, all respectively respective change to the numerical value of the tuning voltage that is applied.At this moment, the receiving signal tuning of a certain frequency of the 1st oscillation circuit same frequency 522～1611kHz, the 2nd oscillation circuit is corresponding with the tuned frequency of the 1st oscillation circuit, and the oscillation signals according of a certain frequency of same frequency 972～2061kHz is tuning.Its result, received signal outputs to medium wave signal output terminal 6 by the 3rd winding 13 of transformer 1, supplies with and does not give illustrated mixed circuit.At mixed circuit, received signal is mixed mutually with oscillation signals according, and both difference on the frequencies just generate the intermediate frequency signal of 450kHz.
On the other hand, when receiving long-wave signal, provide the positive polarity switching signal by medium wave/long wave switching signal terminal 62.Because this switching signal is connected the 2nd switching transistor 52; The 1st switching transistor 51 disconnects owing to inverter 58 makes the polarity inversion of switching signal.So because the disconnection of the 1st switching transistor 51, the ground connection of an end of the 2nd winding 22 of the other end of the 2nd winding 12 of transformer 1 and transformer 2 disconnects; Because the connection of the 2nd switching transistor 52, the other end ground connection of capacitor 45 is communicated with, and capacitor 45 is just connected with the 1st winding 31 parallel connections of transformer 3.
During this state, the 2nd winding 22 of transformer 2, capacitor 23 just with the 1st oscillation circuit together, constitute the 2nd tuning oscillation circuit of long-wave signal that antenna input 5 is introduced; Capacitor 45 constitutes the 4th tuning oscillation circuit of oscillation signals according that oscillation signals according feeding terminal 9 is provided with the 3rd oscillation circuit together.Like this, if supply with the required tuning voltage of tuning voltage feeding terminal 8, this tuning voltage just puts on the negative electrode of the 1st variable capacitance diode 15 and the 2nd variable capacitance diode 36 by resistance 17, the capability value of the capability value of the 1st variable capacitance diode 15 and the 2nd variable capacitance diode 36, all corresponding respectively numerical value that changes to the tuning voltage that is applied.At this moment, the 2nd oscillation circuit is with regard to a certain receiving signal tuning of same frequency 153～281kHz; The 4th oscillation circuit, corresponding with the tuned frequency of the 2nd oscillation circuit, the frequency tuning in a certain local oscillation loop of same frequency 603～731kHz.Its result, received signal outputs to long-wave signal lead-out terminal 7 by the 1st winding 21 of transformer 2, supplies with and does not give illustrated mixed circuit.At mixed circuit, received signal is mixed mutually with oscillation signals according, and both difference on the frequencies just generate the intermediate frequency signal of 450kHz.
But the highest frequency of the local oscillation frequency when receiving the medium wave signal with the ratio of low-limit frequency is: 2061/972=2.12.
Corresponding, the highest frequency of the local oscillation frequency when receiving long-wave signal with the ratio of low-limit frequency is: 731/603=1.21.
Like this, the variable ratio of the frequency of oscillation of the 2nd oscillation circuit when receiving the medium wave signal is 2.12, and by contrast, the variable ratio of the local oscillation frequency of the 4th oscillation circuit when receiving long-wave signal is just very little, has only 1.21.So, on the parallel circuits of the 1st winding 31 of transformer 3 and capacitor 33, only be by the in parallel or not change of shunt capacitor 45, just can constitute the circuit of oscillation signals according one side of medium wave signal or formation circuit to oscillation signals according one side of long-wave signal.
In a word, according to present embodiment, having saved transformer 4, capacitor 43,44 etc. than circuit in the past, is to simplify circuit, can reduce composed component quantity, reduces manufacturing cost, can miniaturization.
But in the present embodiment, the 1st switch element and the 2nd switch element just illustrate with switching transistor 51,52.Certainly,, not merely be to use switching transistor, also can use other switch elements, for example switching field effect transistor etc. according to the 1st switch element of the present invention and the 2nd switch element.
Claims (2)
1. the receiving circuit of long-wave signal and medium wave signal is characterized in that including: the 1st oscillation circuit, to the medium wave signal tuning; The 2nd oscillation circuit, tuning to long-wave signal, with above-mentioned first oscillation circuit series connection; The 3rd oscillation circuit, tuning to oscillation signals according; The 1st switch element is with above-mentioned the 2nd oscillation circuit parallel connection; Capacitor, the 2nd switch element and series circuit thereof are with above-mentioned the 3rd oscillation circuit parallel connection; On-off controller when receiving above-mentioned medium wave signal, makes above-mentioned the 1st switch element connect, and makes above-mentioned the 2nd switch element disconnect; When receiving above-mentioned long-wave signal, make above-mentioned the 1st switch element disconnect, make above-mentioned the 2nd switch element connect.
2. according to the long-wave signal and the medium wave signal receiving circuit of claim 1, it is characterized in that: above-mentioned the 1st switch element and above-mentioned the 2nd switch element all are respectively switching transistors, the complementary transitions signal that their base stage acceptance is sent by on-off controller.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20202696A JPH1051340A (en) | 1996-07-31 | 1996-07-31 | Receiver circuit for long wave signal and medium wave signal |
| JP202026/96 | 1996-07-31 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1176537A CN1176537A (en) | 1998-03-18 |
| CN1081409C true CN1081409C (en) | 2002-03-20 |
Family
ID=16450700
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN97116610A Expired - Fee Related CN1081409C (en) | 1996-07-31 | 1997-07-31 | Long-wave signal and medium-wave signal receiver circuit |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPH1051340A (en) |
| CN (1) | CN1081409C (en) |
| MY (1) | MY125678A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0032878A2 (en) * | 1980-01-21 | 1981-07-29 | Fujitsu Ten, Ltd. | Radio receiver |
| JPS581336A (en) * | 1981-06-26 | 1983-01-06 | Sanyo Electric Co Ltd | Am receiver |
| JPH07264088A (en) * | 1994-03-24 | 1995-10-13 | Yamaha Corp | Mw/lw continuous reception am receiver |
-
1996
- 1996-07-31 JP JP20202696A patent/JPH1051340A/en active Pending
-
1997
- 1997-07-30 MY MYPI9703480 patent/MY125678A/en unknown
- 1997-07-31 CN CN97116610A patent/CN1081409C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0032878A2 (en) * | 1980-01-21 | 1981-07-29 | Fujitsu Ten, Ltd. | Radio receiver |
| JPS581336A (en) * | 1981-06-26 | 1983-01-06 | Sanyo Electric Co Ltd | Am receiver |
| JPH07264088A (en) * | 1994-03-24 | 1995-10-13 | Yamaha Corp | Mw/lw continuous reception am receiver |
Also Published As
| Publication number | Publication date |
|---|---|
| MY125678A (en) | 2006-08-30 |
| CN1176537A (en) | 1998-03-18 |
| JPH1051340A (en) | 1998-02-20 |
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| PB01 | Publication | ||
| CI01 | Correction of invention patent gazette |
Correction item: Inventor Correct: Sako Shigehiroaki False: Sako Shigehiroaki Number: 11 Page: 90 Volume: 14 |
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| C14 | Grant of patent or utility model | ||
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| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |