CN218473162U - Two-tone signal combiner circuit - Google Patents
Two-tone signal combiner circuit Download PDFInfo
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- CN218473162U CN218473162U CN202222448160.5U CN202222448160U CN218473162U CN 218473162 U CN218473162 U CN 218473162U CN 202222448160 U CN202222448160 U CN 202222448160U CN 218473162 U CN218473162 U CN 218473162U
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Abstract
The utility model provides a two-tone signal closes way circuit, include: a first group of isolator links, each isolator link being connected in series by a plurality of isolators of the same model; the first switch group comprises a first switch and a second switch which are controlled in a linkage manner and are respectively connected with two ends of the first isolator link group; the second isolator link group and the second switch group are structurally related to the first isolator link group and the first switch group; and the combiner is used for combining the signals and then outputting the two-tone signals to the equipment to be tested. The utility model provides a two tone signal closes way circuit utilizes a plurality of isolators to constitute isolator link group and improves the isolation of two way transmission links of two tone signals, has avoided the attenuator to signal power's influence, has reduced the structure degree of difficulty that closes the way circuit, and power loss is little, easily realizes the design demand of the higher isolation of high-power more, obtains the two tone signal source of the less IMD of high-power more easily promptly.
Description
Technical Field
The utility model relates to a radio frequency test technical field, concretely relates to two tone signal way circuit.
Background
When the double-tone signals are combined, the isolation between the two signals has great influence on the intermodulation signals generated by the double-tone signals, and the better the isolation between the two signals is, the smaller the generated intermodulation signals are. In the prior art, when a Device Under Test (DUT) is tested for a dual-tone signal, a structure of a combiner for two single-tone signal sources is adopted, and in order to increase isolation between two paths, schemes of adding an isolator and an attenuator to a single path are often adopted, and when requirements for transmitting an inter-modulation Distortion (IMD) signal to the Test equipment are not high, required performance indexes can be often realized by the isolation of the combiner or the scheme of adding the isolator and the attenuator to increase the isolation, but increasing the attenuator means reduction of output power, and a final power amplifier with higher power needs to be adapted, so that design difficulty and cost during testing of the high-power IMD are increased.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides a two-tone signal closes way circuit solves the problem of the design degree of difficulty and cost when the attenuator has increased high-power IMD test among the prior art.
The utility model provides a two-tone signal closes way circuit for carrying out the linearity test to DTU with two-tone signal, make two signal sources pass the utility model provides a pair of two-tone signal closes behind the way circuit, produce the suitable two-tone signal that IMD is littleer of power, include: a first isolator link group, a first switch group, a second isolator link group, a second switch group, and a combiner,
a first isolator link group comprising: the system comprises at least two isolator links, a first single-tone signal source, a second single-tone signal source and a third single-tone signal source, wherein each isolator link is formed by connecting a plurality of isolators with the same type in series and is respectively used for isolating different frequency signals, and the range of the isolated frequency signals is determined according to the signal frequency of the first single-tone signal source;
the first switch group comprises a first switch and a second switch which are controlled in a linkage manner, one end of the first switch is connected with the first single-tone signal source, the other end of the first switch is connected with the input end of the first isolator link group, one end of the second switch is connected with the output end of the first isolator link group, and the other end of the second switch is connected with the input end of the combiner and used for switching on the corresponding isolator link in the first isolator link group according to the signal frequency of the first single-tone signal source;
the second isolator link group comprises at least two isolator links, each isolator link is formed by connecting a plurality of isolators with the same type in series and is respectively used for isolating different frequency signals, and the range of the isolated frequency signals is determined according to the signal frequency of the first single-tone signal source;
the second switch group comprises a third switch and a fourth switch which are controlled in a linkage manner, one end of the third switch is connected with the second single-tone signal source, the other end of the third switch is connected with the input end of the second isolator link group, one end of the fourth switch is connected with the output end of the second isolator link group, and the other end of the fourth switch is connected with the input end of the combiner and used for switching on the corresponding isolator link in the first isolator link group according to the signal frequency of the second single-tone signal source;
and one end of the combiner is connected with the output end of the second switch and the output end of the fourth switch, and the other end of the combiner is connected with the equipment to be tested and is used for combining the signal of the first single-tone signal source and the signal of the second single-tone signal source and outputting a double-tone signal to the equipment to be tested.
The utility model provides a two-tone signal closes way circuit utilizes a plurality of isolators to constitute isolator link group and improves the isolation of two way transmission links of two-tone signal, has avoided the attenuator to signal power's influence, has reduced the structure degree of difficulty that closes the way circuit, and power loss is little, easily realizes the design demand of the higher isolation of higher power, obtains the two-tone signal source of the less IMD of higher power more easily promptly.
Optionally, the isolator links included in the first isolator link group and the second isolator link group are each composed of 2 or 3 isolators of the same type.
The utility model provides an isolator link that contains in the two-tone signal closes way circuit comprises the isolator of 2 or 3 the same models, and the isolator has frequency selectivity, and the isolator of different links has the same frequency response, and every isolator link adopts the design of 2 or 3 isolator series connection, improves the isolation of whole link to realize the high isolation target of link in full frequency channel.
Optionally, the combiner is a resistive combiner.
The utility model provides a two tone signal way circuits circuit is applicable to ordinary resistance type combiner, does not need to optimize the isolation of combiner, and adaptability is good, and ordinary resistance type combiner is low in price, has reduced the hardware cost of way circuit.
Optionally, the two-tone signal combining circuit further includes:
the first input signal amplifier is connected with the first switch and the first tone signal source and is used for amplifying the input signal of the first tone signal source;
and the second input signal amplifier is connected with the third switch and the second single-tone signal source and is used for amplifying the input signal of the second single-tone signal source.
The utility model provides a two-tone signal closes way circuit can increase input signal amplifier according to the in-service use condition, and the adaptation broadband performance matches broadband power amplifier and resistance type combiner through the isolator link of switch selection different frequencies, has realized the processing of automatic quick different frequencies.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following descriptions are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a two-tone signal combining circuit provided in an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a specific embodiment of a two-tone signal combiner circuit provided in an embodiment of the present invention.
Detailed Description
To make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the attached drawings in the embodiments of the present invention are combined to clearly and completely describe the technical solution in the embodiments of the present invention, and obviously, the described embodiments are part of the embodiments of the present invention, rather than all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; the two elements may be directly connected or indirectly connected through an intermediate medium, or may be communicated with each other inside the two elements, or may be wirelessly connected or wired connected. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
The technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.
The embodiment of the utility model provides a two-tone signal closes way circuit, for carrying out the linearity test to DTU with two-tone signal, make two signal sources pass the utility model provides a pair of two-tone signal closes way circuit after, produce the less two-tone signal of IMD that power is suitable, as shown in fig. 1, include: a first isolator link group 1, a first switch group 2, a second isolator link group 3, a second switch group 4, a combiner 5, wherein,
a first isolator link set 1 comprising: the isolator comprises at least two isolator links, each isolator link is formed by connecting a plurality of isolators with the same type in series and is used for isolating different frequency signals respectively, and the range of the isolated frequency signals is determined according to the signal frequency of a first single-tone signal source.
The first switch group 2 comprises a first switch and a second switch which are controlled in a linkage mode, one end of the first switch is connected with the first single-tone signal source, the other end of the first switch is connected with the input end of the first isolator link group, one end of the second switch is connected with the output end of the first isolator link group, the other end of the second switch is connected with the input end of the combiner, and the first switch is used for switching on the corresponding isolator link in the first isolator link group according to the signal frequency of the first single-tone signal source.
The second isolator link group 3 comprises at least two isolator links, each isolator link is formed by connecting a plurality of isolators with the same type in series and is respectively used for isolating different frequency signals, and the range of the isolated frequency signals is determined according to the signal frequency of the first single-tone signal source.
And the second switch group 4 comprises a third switch and a fourth switch which are controlled in a linkage manner, one end of the third switch is connected with the second single-tone signal source, the other end of the third switch is connected with the input end of the second isolator link group, one end of the fourth switch is connected with the output end of the second isolator link group, the other end of the fourth switch is connected with the input end of the combiner, and the second switch group is used for switching on the corresponding isolator link in the first isolator link group according to the signal frequency of the second single-tone signal source.
For example, in practical use, the signal frequency of the first single-tone signal source and the signal frequency of the second single-tone signal source are not greatly different, and in order to simplify circuit design, when the type selection is performed, ISO111-ISO11n in the first isolator link group and ISO211-ISO21n in the second isolator link group are both isolators with the same type, ISO121-ISO12n in the first isolator link group and ISO221-ISO22n in the second isolator link group are isolators with the same type, and ISO131-ISO13n in the first isolator link group and ISO231-ISO23n in the second isolator link group are isolators with the same type. The corresponding signal isolation frequencies of the isolators ISO111-ISO11n, ISO121-ISO12n and ISO131-ISO13n in the first isolator link set are all different, and the corresponding signal isolation frequencies of the isolators ISO211-ISO21n, ISO221-ISO22n and ISO231-ISO23n in the second isolator link set are all different.
Illustratively, the SW11 and the SW12 adopt linkage control, and switch to the corresponding isolator link according to the signal frequency of the first single-tone signal source to ensure that the same link is conducted, where f1_ in fig. 1 is the first single-tone signal. The SW21 and the SW22 adopt linkage control, and switch to the corresponding isolator link according to the signal frequency of the second single-tone signal source to ensure that the same link is conducted, wherein f2_ in fig. 1 is the second single-tone signal. Through the isolation effect of the multi-stage isolator, the physical isolation between the receiving and transmitting ports is realized, the IMD signal deterioration caused by the non-ideal output circuits of the f1_ in and the f2_ in is reduced, and the good IMD signal output performance is realized.
And the combiner 5 is connected with the output end of the second switch and the output end of the fourth switch at one end, and connected with the equipment to be tested at the other end, and is used for combining the signal of the first single-tone signal source and the signal of the second single-tone signal source and outputting a double-tone signal to the equipment to be tested.
It should be noted that, in the wireless handset communication system, the combiner mainly functions to combine the input signals of multiple frequency bands and output the combined signals to the same indoor distribution system. In engineering applications, for example, 800MHz C network, 900MHz G network or other different frequencies need to be output simultaneously, and a combiner is adopted, so that a set of indoor distribution system can simultaneously operate in CDMA frequency band, GSM frequency band or other frequency bands.
Specifically, in one embodiment, the combiner is a resistive combiner. The utility model provides a two tone signal way circuits circuit is applicable to ordinary resistance type combiner, does not need to optimize the isolation of combiner, and adaptability is good, and ordinary resistance type combiner is low in price, has reduced the hardware cost of way circuit. Exemplarily, after the two paths of signals f1_ in and f2_ in are respectively output from the second switch and the fourth switch, the signals are combined by the resistance type combiner with less ideal isolation degree to output pure dual-tone signals, so that the requirement on the isolation degree of the output combiner and the design difficulty of the whole circuit are reduced. In addition, it is required to explain that the combiner of high isolation means great insertion loss, the utility model discloses mean when reducing the isolation requirement that insertion loss has been reduced to when realizing high-power output demand, the design realization of the signal source of being more convenient for.
The utility model provides a two-tone signal closes way circuit utilizes a plurality of isolators to constitute isolator link group and improves the isolation of two way transmission links of two-tone signal, has avoided the attenuator to signal power's influence, has reduced the structure degree of difficulty that closes the way circuit, and power loss is little, easily realizes the design demand of the higher isolation of higher power, obtains the two-tone signal source of the less IMD of higher power more easily promptly.
Specifically, in one embodiment, the isolator links included in the first isolator link group and the second isolator link group are each composed of 2 or 3 isolators of the same model. Illustratively, the number of isolators per link is in principle not limited, but the effect on the final output IMD tends to be less pronounced at levels greater than 2 or 3, so2 or 3 isolators are typically employed, both from an isolation standpoint and cost standpoint.
The utility model provides an isolator link that contains in the two-tone signal way circuit comprises the isolator of 2 or 3 the same models, and the isolator of the same model has the same frequency response, and the isolator has frequency selectivity, and every isolator link adopts the design of 2 or 3 isolator series connections, improves the isolation of whole link to realize the high isolation target of link in full frequency channel.
Specifically, in a specific embodiment, as shown in fig. 2, the two-tone signal combining circuit further includes:
and the first input signal amplifier 6 is connected with the first switch and the first tone signal source and is used for amplifying the input signal of the first tone signal source. And a second input signal amplifier 7 connected to the third switch and the second tone signal source for amplifying the input signal of the second tone signal source.
The utility model provides a two-tone signal closes way circuit can increase input signal amplifier according to the in-service use condition, and the adaptation broadband performance matches broadband power amplifier and resistance type combiner through the isolator link of switch selection different frequencies, has realized the processing of automatic quick different frequencies.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope defined by the appended claims.
Claims (4)
1. A two-tone signal combining circuit, comprising: a first isolator link group, a first switch group, a second isolator link group, a second switch group, and a combiner,
a first isolator link group comprising: the system comprises at least two isolator links, a first single-tone signal source, a second single-tone signal source and a third single-tone signal source, wherein each isolator link is formed by connecting a plurality of isolators with the same type in series and is respectively used for isolating different frequency signals, and the range of the isolated frequency signals is determined according to the signal frequency of the first single-tone signal source;
the first switch group comprises a first switch and a second switch which are controlled in a linkage manner, one end of the first switch is connected with the first single-tone signal source, the other end of the first switch is connected with the input end of the first isolator link group, one end of the second switch is connected with the output end of the first isolator link group, and the other end of the second switch is connected with the input end of the combiner and used for switching on the corresponding isolator link in the first isolator link group according to the signal frequency of the first single-tone signal source;
the second isolator link group comprises at least two isolator links, each isolator link is formed by connecting a plurality of isolators with the same type in series and is respectively used for isolating different frequency signals, and the range of the isolated frequency signals is determined according to the signal frequency of the first single-tone signal source;
the second switch group comprises a third switch and a fourth switch which are controlled in a linkage manner, one end of the third switch is connected with the second single-tone signal source, the other end of the third switch is connected with the input end of the second isolator link group, one end of the fourth switch is connected with the output end of the second isolator link group, and the other end of the fourth switch is connected with the input end of the combiner and used for switching on the corresponding isolator link in the first isolator link group according to the signal frequency of the second single-tone signal source;
and one end of the combiner is connected with the output end of the second switch and the output end of the fourth switch, and the other end of the combiner is connected with the equipment to be tested and is used for combining the signal of the first single-tone signal source and the signal of the second single-tone signal source and then outputting a double-tone signal to the equipment to be tested.
2. The two-tone signal combiner circuit of claim 1, wherein the isolator links included in the first and second isolator link sets each consist of 2 or 3 isolators of the same type.
3. The two-tone signal combining circuit of claim 1, wherein the combiner is a resistive combiner.
4. The two-tone signal combining circuit of claim 1, further comprising:
the first input signal amplifier is connected with the first switch and the first tone signal source and is used for amplifying the input signal of the first tone signal source;
and the second input signal amplifier is connected with the third switch and the second single-tone signal source and is used for amplifying the input signal of the second single-tone signal source.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202222448160.5U CN218473162U (en) | 2022-09-14 | 2022-09-14 | Two-tone signal combiner circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202222448160.5U CN218473162U (en) | 2022-09-14 | 2022-09-14 | Two-tone signal combiner circuit |
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| CN218473162U true CN218473162U (en) | 2023-02-10 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116400111A (en) * | 2023-06-07 | 2023-07-07 | 中星联华科技（北京）有限公司 | Double-sound signal source |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116400111A (en) * | 2023-06-07 | 2023-07-07 | 中星联华科技（北京）有限公司 | Double-sound signal source |
| CN116400111B (en) * | 2023-06-07 | 2023-10-03 | 中星联华科技（北京）有限公司 | Double-sound signal source |
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