CN102420625A - Matching circuit, matching circuit network and signal transmit-receive device - Google Patents
Matching circuit, matching circuit network and signal transmit-receive device Download PDFInfo
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- H—ELECTRICITY
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Abstract
The invention discloses a matching circuit, which comprises an isolating module, a filtering module and a matching module. The filtering module is connected between the isolating module and the matching module; the isolating module is used for isolating signals outside an assigned frequency and sending signals at the assigned frequency; the filtering module is used for filtering away the signals outside the assigned frequency; and the matching module is used for matching the signals at the assigned frequency. Correspondingly, the invention also discloses a matching circuit network and a signal transmit-receive device. The matching circuit, the matching circuit network and the signal transmit-receive device disclosed by the invention not only reduces complexity of the signal transmit-receive device, decreases cost and saves hardware resources, but also solves a problem that multiple paths of signals cannot be received at the same time in the case of using antenna switches and the like in the prior art and improves signal receiving efficiency.
Description
Technical Field
The present invention relates to signal receiving technologies, and in particular, to a matching circuit, a matching circuit network, and a signal transceiver.
Background
Multiband antennas are common in antenna design. Usually, different branches are designed on one antenna, so that multi-band reception of a single antenna is realized. However, with the increasing number of antennas on mobile phones, the multi-antenna technology will cause a lot of area consumption. In fact, with the development of antenna matching technology, when matching parameters of the same antenna are different, the receiving requirements of different frequency bands can be met. Therefore, a single-frequency antenna can be matched with different antenna matching schemes, and multi-band receiving of the antenna can be achieved.
Currently, in the prior art, the antenna switch is switched to different matching circuits, so as to realize multi-band reception of a single antenna. Fig. 1 shows a signal transceiver when a single-frequency antenna in the prior art implements dual-frequency reception, where the signal transceiver includes an antenna switch, a low-frequency transmission branch 1 and a high-frequency transmission branch 2, where the low-frequency transmission branch 1 includes a matching circuit 1, a low-noise amplifier, a matching circuit 2 and a transceiver circuit 1, and the high-frequency transmission branch 2 includes a matching circuit 2, a filter, a matching circuit 4 and a transceiver circuit 2, and a circuit structure of the matching circuit 1 is as shown in fig. 2 and is formed by a series inductor and a parallel capacitor. The circuit configuration of the matching circuit 2 is, as shown in fig. 3, composed of a series capacitor and a parallel inductor. In the signal receiving and transmitting device, the antenna switch is used for switching among different receiving branches, so that the switching of the receiving channels is realized, and the purpose of multi-band receiving by using the same single-frequency antenna is achieved.
The signal transceiver includes an antenna switch, and accordingly, in a device (such as a notebook computer, a portable tablet computer, a handheld mobile phone, a media player with a wireless function, etc.) using the signal transceiver, a circuit for the antenna switch and a logic control module are also required to be added, so that the complexity of the whole signal transceiver is increased, and the implementation process of single-antenna multi-band transceiving is realized.
Disclosure of Invention
In view of the above, the present invention provides a matching circuit, a matching circuit network and a signal transceiver, so as to solve the problem of high complexity of the conventional signal transceiver.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
the present invention provides a matching circuit, comprising: the filter module is connected between the isolation module and the matching module, wherein the isolation module is used for isolating signals except for specified frequency and transmitting signals of the specified frequency; the filtering module is used for filtering out signals except the specified frequency; and the matching module is used for matching the signals with the specified frequency.
The present invention also provides a matching circuit network, comprising: a high frequency transmission branch and a low frequency transmission branch, wherein,
the high frequency transmission branch includes one or two high frequency matching circuits, the high frequency matching circuits including: the filter comprises a first isolation module, a first filtering module and a first matching module, wherein the first filtering module is connected between the first isolation module and the first matching module, and the first isolation module is used for isolating low-frequency signals and transmitting high-frequency signals; the first filtering module is used for filtering out other signals except the high-frequency signal; the first matching module is used for matching the high-frequency signal;
the low frequency transmission branch comprises one or two low frequency matching circuits, and the low frequency matching circuit comprises: the second filter module is connected between the second isolation module and the second matching module, wherein the second isolation module is used for isolating high-frequency signals and transmitting low-frequency signals; the second filtering module is used for filtering out other signals except the low-frequency signal; and the second matching module is used for matching the low-frequency signal.
In the above solution, the first isolation module includes a first capacitor, the first filtering module includes a first series resonant tank, and the first matching module includes the third capacitor and a third inductor;
the third capacitor is connected in series with the third inductor, the third inductor is grounded, one end of the first series resonant circuit is grounded, one end of the first capacitor is connected with the other end of the first series resonant circuit and one end of the third capacitor respectively, the other end of the first capacitor is used as one end of the high-frequency matching circuit, and a connection point between the third capacitor and the third inductor is used as the other end of the high-frequency matching circuit.
In the above scheme, the first isolation module further includes a first inductor, and the first inductor is connected in parallel with the first capacitor;
wherein, satisfy the formula between first inductance and the first electric capacity:
wherein L represents an inductance value of the first inductor, C represents a capacitance value of the first capacitor, and F represents a center frequency of a specified rejection band of the high frequency signal, which is lower than a passband frequency of the first isolation module.
In the above scheme, the first series resonant tank includes a second inductor and a second capacitor connected in series, where a formula is satisfied between the second inductor and the second capacitor:
wherein L represents an inductance value of the second inductor, C represents a capacitance value of the second capacitor, and F represents a center frequency of a specified rejection band of the high frequency signal, which is lower than a passband frequency of the first isolation module.
In the above scheme, the second isolation module includes a fourth inductor, the second filtering module includes a series resonant tank, and the second matching module includes the sixth inductor and a fifth capacitor;
the sixth inductor is connected in series with the fifth capacitor, the fifth capacitor is grounded, one end of the second series resonant circuit is grounded, one end of the fourth inductor is connected with the other end of the second series resonant circuit and one end of the sixth inductor respectively, the other end of the fourth inductor serves as one end of the low-frequency matching circuit, and a connection point between the sixth inductor and the fifth capacitor serves as the other end of the low-frequency matching circuit.
In the above solution, the second series resonant tank includes a fifth inductor and a fourth capacitor connected in series, where a formula is satisfied between the fifth inductor and the fourth capacitor:
wherein L represents an inductance value of the fifth inductor, C represents a capacitance value of the fourth capacitor, and F represents a center frequency of a designated rejection band of the low-frequency signal, which is higher than a passband frequency of the second isolation module.
In the above solution, when the high frequency transmission circuit includes two high frequency matching circuits, first matching modules of the two high frequency matching circuits are connected in series; when the low-frequency transmission circuit comprises two low-frequency matching circuits, second matching modules of the two low-frequency matching circuits are connected in series.
In the above solution, the low frequency transmission branch further includes: and the low-noise amplifier is connected to the second matching module of the low-frequency matching circuit or between the second matching modules of the two low-frequency matching circuits.
In the above scheme, the low noise amplifier operates when the low frequency signal needs to be received, and does not operate when the low frequency signal does not need to be received.
In the above solution, the high-frequency transmission branch further includes: a filter connected to the first matching block of the one high frequency matching circuit or between the first matching blocks of the two high frequency matching circuits.
The present invention also provides a signal transceiving apparatus, comprising: the antenna comprises an antenna, a matching circuit network, a first transceiving circuit and a second transceiving circuit, wherein the matching circuit network transmits low-frequency signals between the antenna and the first transceiving circuit and transmits high-frequency signals between the antenna and the second transceiving circuit;
the matching circuit network includes: a high frequency transmission branch and a low frequency transmission branch; wherein,
the high frequency transmission branch includes a high frequency matching circuit, the high frequency matching circuit including: the filter comprises a first isolation module, a first filtering module and a first matching module, wherein the first filtering module is connected between the first isolation module and the first matching module, and the first isolation module is used for isolating low-frequency signals and transmitting high-frequency signals; the first filtering module is used for filtering out other signals except the high-frequency signal; the first matching module is used for matching the high-frequency signal;
the low frequency transmission branch comprises a low frequency matching circuit, which comprises: the second filter module is connected between the second isolation module and the second matching module, wherein the second isolation module is used for isolating high-frequency signals and transmitting low-frequency signals; the second filtering module is used for filtering out other signals except the low-frequency signal; and the second matching module is used for matching the low-frequency signal.
The present invention also provides a signal transceiving apparatus, comprising: the antenna comprises an antenna, at least one matching circuit network and a transceiving circuit, wherein the at least one matching circuit network divides signals with a plurality of frequencies into high-frequency signals and low-frequency signals, and the high-frequency signals and the low-frequency signals are respectively transmitted between the antenna and the transceiving circuit;
the matching circuit network includes: a high frequency transmission branch and a low frequency transmission branch; wherein,
the high-frequency transmission branch circuit includes two high-frequency matching circuits connected in series, the high-frequency matching circuits including: the filter comprises a first isolation module, a first filtering module and a first matching module, wherein the first filtering module is connected between the first isolation module and the first matching module, and the first isolation module is used for isolating low-frequency signals and transmitting high-frequency signals; the first filtering module is used for filtering out other signals except the high-frequency signal; the first matching module is used for matching the high-frequency signal;
the low frequency transmission branch comprises two low frequency matching circuits connected in series, the low frequency matching circuits comprising: the second filter module is connected between the second isolation module and the second matching module, wherein the second isolation module is used for isolating high-frequency signals and transmitting low-frequency signals; the second filtering module is used for filtering out other signals except the low-frequency signal; and the second matching module is used for matching the low-frequency signal.
In the above scheme, the matching circuit network is configured to divide signals of two frequencies into a high-frequency signal or a low-frequency signal; and respectively transmitting between the antenna and the transceiver circuit, or transmitting on a high-frequency transmission branch or a low-frequency transmission branch in other matching circuit networks connected with the antenna.
According to the matching circuit, the matching circuit network and the signal receiving and transmitting device provided by the invention, the isolation module for isolating signals except for the specified frequency and the filtering module for filtering the signals except for the specified frequency are added in the matching circuit, so that the matching circuit has the function of isolating the signals, and thus, the purpose of carrying out multi-band receiving on the same single-frequency antenna can be achieved without using an antenna switch in the corresponding signal receiving and transmitting device.
Drawings
Fig. 1 is a schematic structural diagram of a signal transceiver in the prior art;
fig. 2 is a schematic diagram of a structure of a low-frequency transmission branch in the signal transceiver shown in fig. 1;
fig. 3 is a schematic diagram illustrating a structure of a high frequency transmission branch in the signal transceiver shown in fig. 1;
FIG. 4 is a schematic diagram of a matching circuit according to the present invention;
FIG. 5 is a schematic circuit diagram of a high frequency matching circuit in the matching circuit network according to the present invention;
FIG. 6 is a schematic diagram of another circuit structure of the high frequency matching circuit in the matching circuit network according to the present invention;
FIG. 7 is a schematic diagram of a circuit structure of a low frequency matching circuit in the matching circuit network of the present invention;
fig. 8 is a schematic structural diagram of a signal transceiver according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of another signal transceiver according to an embodiment of the present invention;
fig. 10 is a schematic structural diagram of a signal transceiver according to a second embodiment of the present invention;
fig. 11 is a schematic structural diagram of another signal transceiver according to a second embodiment of the present invention;
fig. 12 is a schematic structural diagram of a signal transceiver in a third embodiment of the present invention;
fig. 13 is a schematic diagram of a part of WCDMA system structure to which the signal transceiver of the present invention is applied.
Detailed Description
The basic idea of the invention is: the matching circuit of the antenna is improved, so that the matching circuit has the function of isolating high-frequency signals or low-frequency signals, the high-frequency signals can be directly isolated for the matching circuit used for matching the low-frequency signals, only the low-frequency signals are transmitted to the receiving and transmitting circuit, and the low-frequency signals can be directly isolated for the matching circuit used for matching the high-frequency signals, and only the high-frequency signals are transmitted to the receiving and transmitting circuit. Therefore, the signal transceiver does not need to use an antenna switch, and can realize multi-band transceiving of a single antenna, thereby reducing the complexity of the signal transceiver on the premise of ensuring the normal work of the signal transceiver.
As shown in fig. 4, a matching circuit of the present invention includes: the filter module is connected between the isolation module and the matching module, wherein the isolation module is used for isolating signals except for specified frequency and transmitting signals of the specified frequency; the filtering module is used for filtering out signals except the specified frequency so as to enhance the isolation effect of the matching circuit on the signals except the specified frequency; and the matching module is used for matching the signals with the specified frequency.
Here, the signal of the designated frequency may be a high frequency signal of the designated frequency, or a low frequency signal of the designated frequency. Here, the high frequency signal and the low frequency signal are relative concepts, and for two different frequency band signals to be transmitted and received, the high frequency band signal is the high frequency signal, and the low frequency band signal is the low frequency signal. For example, for W850 band signals and W2100 band signals to be received in a Wideband Code Division Multiple Access (WCDMA) system, the W850 band signals are the low frequency signals, and the W2100 band signals are the high frequency signals.
In addition, the present invention also provides a matching circuit network, comprising: a high frequency transmission branch and a low frequency transmission branch, wherein the high frequency transmission branch comprises one or two high frequency matching circuits, the high frequency matching circuits comprising: the filter comprises a first isolation module, a first filtering module and a first matching module, wherein the first filtering module is connected between the first isolation module and the first matching module, and the first isolation module is used for isolating low-frequency signals and transmitting high-frequency signals; the first filtering module is used for filtering out other signals except the high-frequency signal; the first matching module is used for matching the high-frequency signal; the low frequency transmission branch comprises one or two low frequency matching circuits, and the low frequency matching circuit comprises: the second filter module is connected between the second isolation module and the second matching module, wherein the second isolation module is used for isolating high-frequency signals and transmitting low-frequency signals; the second filtering module is used for filtering out other signals except the low-frequency signal; and the second matching module is used for matching the low-frequency signal.
The first isolation module comprises a first capacitor, the first filtering module comprises a first series resonant tank, and the first matching module comprises a third capacitor and a third inductor; the third capacitor is connected in series with the third inductor, the third inductor is grounded, one end of the first series resonant circuit is grounded, one end of the first capacitor is connected with the other end of the first series resonant circuit and one end of the third capacitor respectively, the other end of the first capacitor is used as a signal transmitting end of the high-frequency matching circuit, and a connecting point between the third capacitor and the third inductor is used as the other signal transmitting end of the high-frequency matching circuit. The first series resonant tank comprises an inductance and a capacitance connected in series.
Specifically, the high-frequency matching circuit may have two circuit configurations as follows:
the first, as shown in fig. 5, includes: the high-frequency matching circuit comprises a first capacitor C1, a second inductor L2, a second capacitor C2, a third capacitor C3 and a third inductor L3, wherein the second inductor L2 is connected with the second capacitor C2 in series, the second capacitor C2 is grounded, the third capacitor C3 is connected with the third inductor L3 in series, the third inductor L3 is grounded, one end of the first capacitor C1 serves as one end of the first high-frequency matching circuit, the other end of the first capacitor C1 is connected with the second inductor L2 and the third capacitor C3 respectively, and a connection point between the third capacitor C3 and the third inductor L3 serves as the other end of the first high-frequency matching circuit. Wherein, the first isolation module comprises the first capacitor C1, the first filtering module comprises the second inductor L2 and the second capacitor C2, and the first matching module comprises the third capacitor C3 and the third inductor L3.
The second, as shown in fig. 6, includes: the high-frequency matching circuit comprises a first inductor L1, a first capacitor C1, a second inductor L2, a second capacitor C2, a third capacitor C3 and a third inductor L3, wherein the second inductor L2 is connected with the second capacitor C2 in series, the second capacitor C2 is grounded, the third capacitor C3 is connected with the third inductor L3 in series, the third inductor L3 is grounded, the first inductor L1 is connected with the first capacitor C1 in parallel, one end of the first capacitor C1 serves as one end of the first high-frequency matching circuit, the other end of the first capacitor C1 is connected with the second inductor L2 and the third capacitor C3 respectively, and a connection point between the third capacitor C3 and the third inductor L3 serves as the other end of the first high-frequency matching circuit. The first isolation module comprises the first inductor L1 and a first capacitor C1, the first filtering module comprises the second inductor L2 and a second capacitor C2, and the first matching module comprises the third capacitor C3 and a third inductor L3.
The second isolation module comprises a fourth inductor, the second filtering module comprises a series resonant circuit, and the second matching module comprises a sixth inductor and a fifth capacitor; the sixth inductor is connected in series with the fifth capacitor, the fifth capacitor is grounded, one end of the second series resonant circuit is grounded, one end of the fourth inductor is connected with the other end of the second series resonant circuit and one end of the sixth inductor respectively, the other end of the fourth inductor serves as one end of the low-frequency matching circuit, and a connection point between the sixth inductor and the fifth capacitor serves as the other end of the low-frequency matching circuit.
Specifically, the circuit structure of the low frequency matching circuit is shown in fig. 7, and includes: a fourth inductor L4, a fifth inductor L5, a fourth capacitor C4, a sixth inductor L6, and a fifth capacitor C5, wherein the fifth inductor L5 is connected in series with the fourth capacitor C4, the second capacitor C4 is grounded, the sixth inductor L6 is connected in series with the fifth capacitor C5, the fifth capacitor C5 is grounded, one end of the fourth inductor L4 is used as one end of the first low-frequency matching circuit, the other end of the fourth inductor L4 is connected to the fifth inductor L5 and the sixth inductor L6, and a connection point between the sixth inductor L6 and the fifth capacitor C5 is used as the other end of the first low-frequency matching circuit. The second isolation module comprises the fourth inductor L4, the second filtering module comprises the fifth inductor L5 and a fourth capacitor C4, and the second matching module comprises the sixth inductor L6 and a fifth capacitor C5.
The first capacitor C1 is used to isolate the signal of the lower frequency band from affecting the operation of the high frequency band, and reduce the effect of the fifth inductor L5 and the fourth capacitor C4 on the second inductor L2 and the second capacitor C2; the fourth inductor L4 is used to isolate the signal of the higher frequency band from affecting the operation of the lower frequency band, and reduce the effect of the second inductor L2 and the second capacitor C2 on the fifth inductor L5 and the fourth capacitor C4; the third capacitor C3 and the third inductor L3, and the fifth capacitor C5 and the sixth inductor L6 are mainly used for tuning, i.e., performing matching processing on signals; the second inductor L2 and the second capacitor C2 are used for filtering low-frequency band signals and form a high-pass filter together with the first capacitor C1; the fifth inductor L5 and the fourth capacitor C4 are used for filtering high-frequency band signals, and form a low-pass filter together with the fourth inductor L4.
Wherein, the first inductor L1 and the first capacitor C1, the second inductor L2 and the second capacitor C2, and the fifth inductor L5 and the fourth capacitor C4 all satisfy the following formula:
where L represents the inductance value of the corresponding inductor, C represents the capacitance value of the corresponding capacitor, and F represents the center frequency of the specified rejection band of the corresponding signal. Specifically, F represents the center frequency of the specified rejection band of the high frequency signal, lower than the pass band frequency of the first isolation module, for the first inductor L1 and the first capacitor C1, and for the second inductor L2 and the second capacitor C2. For the fifth inductor L5 and the fourth capacitor C4, F is the center frequency of the designated rejection band of the low-frequency signal, which is higher than the passband frequency of the second isolation module.
In practical applications, for the high-frequency matching circuit shown in fig. 6, due to the addition of the first inductor L1, the high-frequency matching circuit has a higher performance isolation effect than the first high-frequency matching circuit, and the low-frequency bandwidth is also narrowed. Therefore, the second high-frequency matching circuit is suitable for a case where the low-frequency bandwidth is slightly narrow, and for example, the low-frequency relative bandwidth may be 40% or less.
When the high-frequency transmission circuit comprises two high-frequency matching circuits, first matching modules of the two high-frequency matching circuits are connected in series; when the low-frequency transmission circuit comprises two low-frequency matching circuits, second matching modules of the two low-frequency matching circuits are connected in series.
Here, the low frequency transmission branch may further include: and the low-noise amplifier is connected to the second matching module of the low-frequency matching circuit or between the second matching modules of the two low-frequency matching circuits. The low noise amplifier works when the low frequency signal needs to be received, and does not work when the low frequency signal does not need to be received.
Here, the high-frequency transmitting branch may further include: a filter connected to the first matching block of the one high frequency matching circuit or between the first matching blocks of the two high frequency matching circuits.
For example, for the application of analog television, when receiving signals with a frequency band greater than 160MHz and signals with a frequency band less than 120MHz, the two high frequency matching circuits on the high frequency transmission branch both adopt the circuit structure shown in fig. 5, and the two low frequency matching circuits on the low frequency transmission branch both adopt the circuit structure shown in fig. 7, then the specific parameters may be: specific parameters of C1 ═ 22pF, C2 ═ 56pF, C3 ═ 22pF, C4 ═ 27pF, and C5 may be adjusted as appropriate, in this example, C5 is empty, L2 ═ 56nH, and L3 may be adjusted as appropriate, in this example, L3 is empty, L4 ═ 68nH, L5 ═ 22nH, and L6 ═ 68 nH.
In addition, the present invention also provides a signal transceiving apparatus, comprising: the antenna comprises an antenna, a matching circuit network, a first transceiving circuit and a second transceiving circuit, wherein the matching circuit network transmits low-frequency signals between the antenna and the first transceiving circuit and transmits high-frequency signals between the antenna and the second transceiving circuit;
the matching circuit network includes: a high frequency transmission branch and a low frequency transmission branch; wherein the high frequency transmission branch includes a high frequency matching circuit, the high frequency matching circuit including: the filter comprises a first isolation module, a first filtering module and a first matching module, wherein the first filtering module is connected between the first isolation module and the first matching module, and the first isolation module is used for isolating low-frequency signals and transmitting high-frequency signals; the first filtering module is used for filtering out other signals except the high-frequency signal; the first matching module is used for matching the high-frequency signal; the low frequency transmission branch comprises a low frequency matching circuit, which comprises: the second filter module is connected between the second isolation module and the second matching module, wherein the second isolation module is used for isolating high-frequency signals and transmitting low-frequency signals; the second filtering module is used for filtering out other signals except the low-frequency signal; and the second matching module is used for matching the low-frequency signal.
The present invention also provides another signal transceiving apparatus, comprising: the antenna comprises an antenna, at least one matching circuit network and a transceiving circuit, wherein the at least one matching circuit network divides signals with a plurality of frequencies into high-frequency signals and low-frequency signals, and the high-frequency signals and the low-frequency signals are respectively transmitted between the antenna and the transceiving circuit;
the matching circuit network includes: a high frequency transmission branch and a low frequency transmission branch; wherein the high-frequency transmission branch circuit includes two high-frequency matching circuits connected in series, the high-frequency matching circuits including: the filter comprises a first isolation module, a first filtering module and a first matching module, wherein the first filtering module is connected between the first isolation module and the first matching module, and the first isolation module is used for isolating low-frequency signals and transmitting high-frequency signals; the first filtering module is used for filtering out other signals except the high-frequency signal; the first matching module is used for matching the high-frequency signal; the low frequency transmission branch comprises two low frequency matching circuits connected in series, the low frequency matching circuits comprising: the second filter module is connected between the second isolation module and the second matching module, wherein the second isolation module is used for isolating high-frequency signals and transmitting low-frequency signals; the second filtering module is used for filtering out other signals except the low-frequency signal; and the second matching module is used for matching the low-frequency signal.
The matching circuit network is used for dividing signals of two frequencies into high-frequency signals or low-frequency signals; and respectively transmitting between the antenna and the transceiver circuit, or transmitting on a high-frequency transmission branch or a low-frequency transmission branch in other matching circuit networks connected with the antenna.
Example one
As shown in fig. 8, the signal transceiver in this embodiment mainly includes: the antenna comprises an antenna, a high-frequency transmission branch, a low-frequency transmission branch, a first transceiving circuit and a second transceiving circuit, wherein the high-frequency transmission branch and the low-frequency transmission branch are connected in parallel between the antenna and the first transceiving circuit and the second transceiving circuit, the input end of the high-frequency transmission branch and the input end of the low-frequency transmission branch are connected with the antenna, the output end of the high-frequency transmission branch is connected with the second transceiving circuit, and the output end of the low-frequency transmission branch is connected with the first transceiving circuit.
The high-frequency transmission branch comprises a first high-frequency matching circuit, and the low-frequency transmission branch comprises a first low-frequency matching circuit. The second transceiver circuit is configured to transceive a high-frequency signal transmitted via the high-frequency transmission branch, and the first transceiver circuit is configured to transceive a low-frequency signal transmitted via the low-frequency transmission branch.
Here, the first high-frequency matching circuit has a configuration identical to that of the high-frequency matching circuit described above, in which the first high-frequency matching circuit has an input terminal of the first isolation block as its own input terminal, and an output terminal of the first matching block as its own output terminal.
The first low-frequency matching circuit has the same structure as the low-frequency matching circuit, wherein the first low-frequency matching circuit takes the input end of the second isolation module as the input end of the first low-frequency matching circuit, and takes the output end of the second low-frequency matching circuit as the output end of the first low-frequency matching circuit.
In the signal transceiver in this embodiment, a low-noise amplifier may be further added to the low-frequency transmission branch, a filter may be further added to the high-frequency transmission branch, and the signal transceiver after adding the low-noise amplifier and the filter is as shown in fig. 9, where an input end of the low-noise amplifier is connected to an output end of the first low-frequency matching circuit, an output end of the low-noise amplifier is connected to an input end of the first transceiver, and the low-noise amplifier operates when it is necessary to receive a low-frequency signal and does not operate when it is not necessary to receive the low-frequency. Specifically, the low noise amplifier is controlled by a baseband chip, and when a low frequency signal needs to be received, the baseband chip switches on a power supply for the low noise amplifier, so that the low noise amplifier works; when the baseband chip does not need to receive low-frequency signals, the power supply of the low-noise amplifier is turned off, so that the low-noise amplifier does not work. Therefore, the isolation of the low-frequency transmission branch circuit to high-frequency signals can be enhanced through the opening and closing of the low-noise amplifier, so that the high-frequency receiving and the low-frequency receiving can be not influenced by time division operation.
If the isolation effect of the high-frequency matching circuit on low frequency is not good or better isolation effect is needed, a filter can be added on the high-frequency transmission branch, the input end of the filter is connected with the output end of the first high-frequency matching circuit, and the output end of the filter is connected with the input end of the second transceiver circuit, so that interference signals can be filtered, and self-oscillation of the low-noise amplifier can be prevented. And, through increasing the wave filter, can strengthen the high frequency and transmit the segregation of the branch road to the low frequency signal, make high frequency receive and low frequency receive and can not influence by the time division work, while working at the same time, can reduce the mutual influence.
Specifically, when the antenna receives an electric signal of a low frequency, the low noise amplifier operates, and the electric signal reaches the first transceiver circuit via the low frequency transmission branch. When the antenna receives a high-frequency electric signal, the low-noise amplifier does not work, and the electric signal reaches the second transceiver circuit through the high-frequency transmission branch.
In this embodiment, by adding the low noise amplifier to the low frequency transmission branch and adding the filter to the high frequency transmission branch, the isolation between the high frequency transmission branch and the low frequency signal is greater than 20dB when receiving the high frequency signal, and the performance that the antenna switch can achieve can be achieved completely.
The present embodiment is applied to the case of dual receivers.
Example two
As shown in fig. 10, the signal transceiver in this embodiment mainly includes: the antenna comprises an antenna, a high-frequency transmission branch, a low-frequency transmission branch and a transceiving circuit, wherein the high-frequency transmission branch and the low-frequency transmission branch are connected between the antenna and the transceiving circuit in parallel, the input end of the high-frequency transmission branch and the input end of the low-frequency transmission branch are connected with the antenna, and the output end of the high-frequency transmission branch is connected with the transceiving circuit. The high-frequency transmission branch circuit comprises a first high-frequency matching circuit and a second high-frequency matching circuit, the low-frequency transmission branch circuit comprises a first low-frequency matching circuit and a second low-frequency matching circuit, and the transceiver circuit is used for receiving high-frequency signals and low-frequency signals.
The first high-frequency matching circuit is connected with the antenna in series, and the second high-frequency matching circuit is connected with the transceiving circuit; the first low-frequency matching circuit is connected with the second low-frequency matching circuit in series, the first low-frequency matching circuit is connected with the antenna, and the second low-frequency matching circuit is connected with the transceiver circuit.
Here, the first high-frequency matching circuit and the second high-frequency matching circuit have the same structure as the high-frequency matching circuit described above, and are not repeated herein, where the first high-frequency matching circuit uses the input terminal of the first isolation module as its input terminal, and uses the output terminal of the first matching module as its output terminal, and the second high-frequency matching circuit uses the input terminal of the first matching module as its input terminal, and uses the output terminal of the first isolation module as its output terminal.
The first low-frequency matching circuit and the second low-frequency matching circuit have the same structure as the high-frequency matching circuit described above, and are not repeated, wherein the first low-frequency matching circuit uses the input terminal of the second isolation module as its own input terminal, uses the output terminal of the second matching module as its own output terminal, and the second low-frequency matching circuit uses the input terminal of the second matching module as its own input terminal, and uses the output terminal of the second isolation module as its own output terminal.
Similarly, the signal transceiver in this embodiment may also add a low noise amplifier to the low frequency transmission branch, add a filter to the high frequency transmission branch, and add the low noise amplifier and the filter to the signal transceiver as shown in fig. 11. The low noise amplifier is connected between the first low frequency matching circuit and the second low frequency matching circuit, and the filter is connected between the first high frequency matching circuit and the second high frequency matching circuit. Specifically, the input end of the filter is connected to the first high-frequency matching circuit, and the output end of the filter is connected to the second high-frequency matching circuit. The input end of the low-noise amplifier is connected with the first low-frequency matching circuit, and the output end of the low-noise amplifier is connected with the second low-frequency matching circuit.
The low-noise amplifier works when the low-frequency signal needs to be received, and does not work when the low-frequency signal does not need to be received.
EXAMPLE III
In practical applications, the high-frequency transmission branch and the low-frequency transmission branch of the signal transceiver in the second embodiment may be further subdivided, and the received signals of the antenna are transmitted in a matching manner through the four branches, so that the effect of respectively matching the single-frequency antenna to the four frequency bands is achieved, and the bandwidth of the antenna is improved.
As shown in fig. 12, the signal transceiver in this embodiment includes three matching circuit networks, one of which is a first-stage matching circuit network, and the other two of which are second-stage matching circuit networks, a low-frequency transmission branch in the first-stage matching circuit network includes a first low-frequency matching circuit and a second low-frequency matching circuit, and a high-frequency transmission branch includes a first high-frequency matching circuit and a second high-frequency matching circuit; and the two secondary matching circuit networks are respectively connected to the high-frequency transmission branch and the low-frequency transmission branch of the primary matching circuit network.
The low-frequency transmission branch of the second-stage matching circuit network is connected to the high-frequency transmission branch of the first-stage matching circuit network, comprises a fifth low-frequency matching circuit and a sixth low-frequency matching circuit, and is used for subdividing signals of two frequency bands in a high-frequency signal on the high-frequency transmission branch of the first-stage matching circuit network into a high-frequency signal and a low-frequency signal, and transmitting the high-frequency signal and the low-frequency signal through the high-frequency transmission branch and the low-frequency transmission branch of the second-stage matching circuit network in the first-stage matching circuit network respectively; the high-frequency transmission branch circuit comprises a fifth high-frequency matching circuit and a sixth high-frequency matching circuit;
the second-stage matching circuit network is connected to the high-frequency transmission branch of the first-stage matching circuit network and is used for subdividing signals of two frequency bands in the high-frequency signals on the low-frequency transmission branch of the first-stage matching circuit network into high-frequency signals and low-frequency signals, and transmitting the high-frequency signals and the low-frequency signals through the high-frequency transmission branch and the low-frequency transmission branch of the second-stage matching circuit network respectively; the low-frequency transmission branch comprises a third low-frequency matching circuit and a fourth low-frequency matching circuit, and the high-frequency transmission branch comprises a third high-frequency matching circuit and a fourth high-frequency matching circuit.
Specifically, the structure of each high-frequency matching circuit is completely the same as that of the high-frequency matching circuit described above, and is not repeated here, where the first high-frequency matching circuit, the third high-frequency matching circuit, and the fifth high-frequency matching circuit all use the input end of the first isolation module as their own input end, use the output end of the first matching module as their own output end, and the second high-frequency matching circuit, the fourth high-frequency matching circuit, and the sixth high-frequency matching circuit use the input end of the first matching module as their own input end, and use the output end of the first isolation module as their own output end.
The structure of each low-frequency matching circuit is completely the same as that of the low-frequency matching circuit described above, and is not repeated, wherein the first low-frequency matching circuit, the third low-frequency matching circuit, and the fifth low-frequency matching circuit all use the input end of the second isolation module as their input ends, use the output end of the second matching module as their output ends, and use the input end of the second matching module as their input ends, and use the output end of the second isolation module as their output ends.
In this embodiment, the structure of the signal processing apparatus is similar to that in the embodiment, except that the high-frequency transmission branch and the low-frequency transmission branch receive signals of two specified frequency bands respectively in a branch adding manner. For example, if it is required to receive signals of four frequency bands of GSM1800/1900 and GSM850/900, the GSM1800/1900 signal may be designated as a high frequency signal, the GSM850/900 signal may be designated as a low frequency signal, the high frequency transmission branch may receive the GSM1800/1900 signal, and the low frequency transmission branch may receive the GSM850/900 frequency band signal. Specifically, when the high frequency transmitting branch receives the GSM1800/1900 signal, the GSM1900 signal is received through the second high frequency receiving sub-branch, the GSM1800 signal is received through the second low frequency receiving sub-branch, and when the low frequency transmitting branch receives the GSM850/900 signal, the GSM900 signal is received through the first high frequency receiving sub-branch, and the GSM850 signal is received through the first low frequency receiving sub-branch.
In this embodiment, the low-frequency transmitting branch and each low-frequency receiving sub-branch may be provided with a low-noise amplifier, and the low-noise amplifier is disposed between two low-frequency matching circuits on the branch. Correspondingly, a filter may be added to the high-frequency transmitting branch and each high-frequency receiving sub-branch, and the filter is set between two high-frequency matching circuits in the branch, which is not described again.
Similarly, if signals of six frequency bands need to be received, a matching circuit network can be further arranged in one of the two second-stage matching circuit networks, if signals of eight frequency bands need to be received, matching circuit networks can be further arranged in two of the two second-stage matching circuit networks respectively, and so on, and the specific implementation process is similar to the process and is not repeated.
Example four
The present embodiment specifically describes the application of the signal transceiver provided in the present invention.
As shown in fig. 13, which is a block diagram of a WCDMA system with GSM850/900/1800/1900 band and W850/1900/2100 band, the signal transceiver in the first embodiment is applied in fig. 13 to distinguish the W850 band from the W2100 band.
Specifically, the common branch of W850/2100 is connected to a high frequency matching circuit and a low frequency matching circuit, respectively, wherein, after the transmission signal of W2100 is generated by the transmitting part of the rf transceiver chip, the signal is transmitted to a Power Amplifier (PA) of W2100 for amplification, and the amplified signal passes through a W2100 duplexer (including the above-mentioned filter), reaches the high frequency matching circuit, and is transmitted to an antenna through an antenna switch to be transmitted to a space. The reception signal of W2100 reaches the high-frequency matching circuit via the antenna switch, and reaches the W2100 transceiver circuit of the rf transceiver chip via the duplexer (including the above-mentioned filter). The transmitting signal of W850 is generated by the transmitting part of the rf transceiver chip, then transmitted to the power amplifier of W850 for amplification, and the amplified signal passes through the W850 duplexer (including the above-mentioned filter), reaches the low frequency matching circuit, and is transmitted to the antenna through the antenna switch to be transmitted to the space. The reception signal of W850 reaches the low frequency matching circuit via the antenna switch, and reaches the W850 transceiver circuit of the rf transceiver chip via the duplexer (including the above-mentioned filter). Thus, the W2100 frequency band signal and the W850 frequency band signal can be received without arranging an antenna switch behind the shared branch of the W850/2100.
Specifically, in this embodiment, the low-frequency matching circuit has the circuit structure shown in fig. 7, and the high-frequency matching circuit has the circuit structure shown in fig. 6, and the specific parameters thereof may be: c1 ═ 4.7pF, C2 ═ 4.7pF, C3 ═ 5.6pF, C4 ═ 2.2pF, and the specific parameters of C5 were adjusted according to the circuit conditions, in this case C5 was empty, L1 ═ 6.8nH, L2 ═ 6.8nH, and the specific parameters of L3 were adjusted according to the circuit conditions, in this case C5 was empty, L4 ═ 6.8nH, L5 ═ 2.2nH, and L6 ═ 6.8 nH.
It was measured that the isolation was better than 20dB when the W2100 and W850 signals were received in the above manner. The receiving loss of the W850 frequency band is 0.5-0.6dB, and the receiving loss of the W2100 frequency band is 0.22-0.3dB, so that the signal receiving and transmitting device can not only save an antenna switch and reduce the complexity of a system, but also achieve high isolation and low loss.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.
Claims (14)
1. A matching circuit, characterized in that the matching circuit comprises: the filter module is connected between the isolation module and the matching module, wherein the isolation module is used for isolating signals except for specified frequency and transmitting signals of the specified frequency; the filtering module is used for filtering out signals except the specified frequency; and the matching module is used for matching the signals with the specified frequency.
2. A matching circuit network, characterized in that the matching circuit network comprises: a high frequency transmission branch and a low frequency transmission branch, wherein,
the high frequency transmission branch includes one or two high frequency matching circuits, the high frequency matching circuits including: the filter comprises a first isolation module, a first filtering module and a first matching module, wherein the first filtering module is connected between the first isolation module and the first matching module, and the first isolation module is used for isolating low-frequency signals and transmitting high-frequency signals; the first filtering module is used for filtering out other signals except the high-frequency signal; the first matching module is used for matching the high-frequency signal;
the low frequency transmission branch comprises one or two low frequency matching circuits, and the low frequency matching circuit comprises: the second filter module is connected between the second isolation module and the second matching module, wherein the second isolation module is used for isolating high-frequency signals and transmitting low-frequency signals; the second filtering module is used for filtering out other signals except the low-frequency signal; and the second matching module is used for matching the low-frequency signal.
3. The matching circuit network of claim 2, wherein the first isolation module comprises a first capacitor, the first filtering module comprises a first series resonant tank, and the first matching module comprises the third capacitor and a third inductor;
the third capacitor is connected in series with the third inductor, the third inductor is grounded, one end of the first series resonant circuit is grounded, one end of the first capacitor is connected with the other end of the first series resonant circuit and one end of the third capacitor respectively, the other end of the first capacitor is used as one end of the high-frequency matching circuit, and a connection point between the third capacitor and the third inductor is used as the other end of the high-frequency matching circuit.
4. The matching circuit network of claim 3, wherein the first isolation module further comprises a first inductor connected in parallel with the first capacitor;
wherein, satisfy the formula between first inductance and the first electric capacity:wherein L represents an inductance value of the first inductor, C represents a capacitance value of the first capacitor, and F represents a center frequency of a specified rejection band of the high frequency signal, which is lower than a passband frequency of the first isolation module.
5. The matching circuit network of claim 3 or 4, wherein the first series resonant tank comprises a second inductor and a second capacitor connected in series, wherein the second inductor and the second capacitor satisfy the formula:
wherein L represents an inductance value of the second inductor, C represents a capacitance value of the second capacitor, and F represents a center frequency of a specified rejection band of the high frequency signal, which is lower than a passband frequency of the first isolation module.
6. The matching circuit network of claim 2, wherein the second isolation module comprises a fourth inductor, the second filtering module comprises a series resonant tank, and the second matching module comprises the sixth inductor and a fifth capacitor;
the sixth inductor is connected in series with the fifth capacitor, the fifth capacitor is grounded, one end of the second series resonant circuit is grounded, one end of the fourth inductor is connected with the other end of the second series resonant circuit and one end of the sixth inductor respectively, the other end of the fourth inductor serves as one end of the low-frequency matching circuit, and a connection point between the sixth inductor and the fifth capacitor serves as the other end of the low-frequency matching circuit.
7. The matching circuit network of claim 6, whichCharacterized in that the second series resonant tank comprises a fifth inductor and a fourth capacitor connected in series, wherein the fifth inductor and the fourth capacitor satisfy the formula:wherein L represents an inductance value of the fifth inductor, C represents a capacitance value of the fourth capacitor, and F represents a center frequency of a designated rejection band of the low-frequency signal, which is higher than a passband frequency of the second isolation module.
8. Matching circuit network according to one of the claims 2 to 7,
when the high-frequency transmission circuit comprises two high-frequency matching circuits, first matching modules of the two high-frequency matching circuits are connected in series;
when the low-frequency transmission circuit comprises two low-frequency matching circuits, second matching modules of the two low-frequency matching circuits are connected in series.
9. Matching circuit network according to any of claims 2 to 7, characterized in that said low frequency transmission branch further comprises: and the low-noise amplifier is connected to the second matching module of the low-frequency matching circuit or between the second matching modules of the two low-frequency matching circuits.
10. The matching circuit network of claim 8, wherein the low noise amplifier is operative when reception of low frequency signals is desired and is inoperative when reception of low frequency signals is not desired.
11. Matching circuit network according to one of claims 2 to 7, characterized in that the high frequency transmission branch further comprises: a filter connected to the first matching block of the one high frequency matching circuit or between the first matching blocks of the two high frequency matching circuits.
12. A signal transceiving apparatus, comprising: the antenna comprises an antenna, a matching circuit network, a first transceiving circuit and a second transceiving circuit, wherein the matching circuit network transmits low-frequency signals between the antenna and the first transceiving circuit and transmits high-frequency signals between the antenna and the second transceiving circuit;
the matching circuit network includes: a high frequency transmission branch and a low frequency transmission branch; wherein,
the high frequency transmission branch includes a high frequency matching circuit, the high frequency matching circuit including: the filter comprises a first isolation module, a first filtering module and a first matching module, wherein the first filtering module is connected between the first isolation module and the first matching module, and the first isolation module is used for isolating low-frequency signals and transmitting high-frequency signals; the first filtering module is used for filtering out other signals except the high-frequency signal; the first matching module is used for matching the high-frequency signal;
the low frequency transmission branch comprises a low frequency matching circuit, which comprises: the second filter module is connected between the second isolation module and the second matching module, wherein the second isolation module is used for isolating high-frequency signals and transmitting low-frequency signals; the second filtering module is used for filtering out other signals except the low-frequency signal; and the second matching module is used for matching the low-frequency signal.
13. A signal transceiving apparatus, comprising: the antenna comprises an antenna, at least one matching circuit network and a transceiving circuit, wherein the at least one matching circuit network divides signals with a plurality of frequencies into high-frequency signals and low-frequency signals, and the high-frequency signals and the low-frequency signals are respectively transmitted between the antenna and the transceiving circuit;
the matching circuit network includes: a high frequency transmission branch and a low frequency transmission branch; wherein,
the high-frequency transmission branch circuit includes two high-frequency matching circuits connected in series, the high-frequency matching circuits including: the filter comprises a first isolation module, a first filtering module and a first matching module, wherein the first filtering module is connected between the first isolation module and the first matching module, and the first isolation module is used for isolating low-frequency signals and transmitting high-frequency signals; the first filtering module is used for filtering out other signals except the high-frequency signal; the first matching module is used for matching the high-frequency signal;
the low frequency transmission branch comprises two low frequency matching circuits connected in series, the low frequency matching circuits comprising: the second filter module is connected between the second isolation module and the second matching module, wherein the second isolation module is used for isolating high-frequency signals and transmitting low-frequency signals; the second filtering module is used for filtering out other signals except the low-frequency signal; and the second matching module is used for matching the low-frequency signal.
14. The signal transceiving apparatus of claim 13, wherein the one matching circuit network is configured to divide signals of two frequencies into a high frequency signal or a low frequency signal;
and respectively transmitting between the antenna and the transceiver circuit, or transmitting on a high-frequency transmission branch or a low-frequency transmission branch in other matching circuit networks connected with the antenna.
Priority Applications (2)
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| CN201110376547.8A CN102420625B (en) | 2011-11-23 | 2011-11-23 | Matching circuit, matching circuit network and signal transmit-receive device |
| PCT/CN2012/070765 WO2013075404A1 (en) | 2011-11-23 | 2012-01-30 | Matching circuit, matching circuit network, and signal transceiver device |
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| CN201110376547.8A CN102420625B (en) | 2011-11-23 | 2011-11-23 | Matching circuit, matching circuit network and signal transmit-receive device |
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| CN102420625B (en) | 2014-04-30 |
| WO2013075404A1 (en) | 2013-05-30 |
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