WO2013075404A1

WO2013075404A1 - Matching circuit, matching circuit network, and signal transceiver device

Info

Publication number: WO2013075404A1
Application number: PCT/CN2012/070765
Authority: WO
Inventors: 何文卿
Original assignee: 中兴通讯股份有限公司
Priority date: 2011-11-23
Filing date: 2012-01-30
Publication date: 2013-05-30
Also published as: CN102420625B; CN102420625A

Abstract

Disclosed is a matching circuit. The matching circuit comprises an isolation module, a filtering module, and a matching module. The filtering module is connected between the isolation module and the matching module. The isolation module is used for isolating signals not having a specified frequency, and transmitting a signal of the specified frequency. The filtering module is used for filtering out signals not having the specified frequency. The matching module is used for performing matching on the signal of the specified frequency. Correspondingly, also disclosed are a matching circuit network and a signal transceiver device. The complexity of the signal transceiver device can be decreased, the costs can be decreased, and the hardware resources can be conserved; furthermore, the problem of the incapability in receiving signals of multiple paths at the same time in a situation that an antenna switch is used in the prior art is solved, and the signal receiving efficiency is improved.

Description

Matching circuit, matching circuit network and signal transceiver device

The present invention relates to signal receiving technologies, and in particular, to a matching circuit, a matching circuit network, and a signal transceiving device. Background technique

Multi-band antennas are very common in antenna design. It is usually manifested by designing different antennas for one antenna to achieve multi-band reception of a single antenna. However, with the ever-increasing number of antennas on mobile phones, multi-antenna technology will cause a large amount of area consumption. In fact, with the development of the antenna matching technology, the same antenna can meet the receiving requirements of different frequency bands when the matching parameters are different. Therefore, a single-frequency antenna can be combined with different antenna matching schemes to achieve multi-band reception of the antenna.

At present, the prior art realizes multi-band reception of a single antenna by switching to different matching circuits using an antenna switch. FIG. 1 shows a signal transceiving device for realizing dual-frequency reception in a conventional single-frequency antenna, and the signal transceiving device includes an antenna switch, a low-frequency transmission branch 1 and a high-frequency transmission branch 2, wherein the low-frequency transmission branch The circuit 1 includes a matching circuit 1, a low noise amplifier, and a transceiver circuit 1. The high frequency transmission branch 2 includes a matching circuit 2, a filter, and a transceiver circuit 2. The circuit structure of the matching circuit 1 is as shown in FIG. The series inductor and the parallel capacitor are formed. The circuit structure of the matching circuit 2 is as shown in Fig. 3, and is composed of a series capacitor and a shunt inductor. In the above signal transmitting and receiving device, the antenna switch is switched on different receiving branches to realize switching of the receiving channel, and the same single-frequency antenna is used for multi-band reception.

The above-mentioned signal transceiving device includes an antenna switch, and correspondingly, in a device using the signal transceiving device (such as a notebook computer, a portable tablet computer, a handheld mobile phone, a media player with a wireless function, etc.), it is also required to increase accordingly. Circuit to antenna switch and logic control mode The block, in this way, increases the complexity of the entire signal transceiving device and the implementation of single-antenna multi-band transceiving. Summary of the invention

In view of this, the main object of the present invention is to provide a matching circuit, a matching circuit network, and a signal transceiving device to solve the problem of high complexity of the existing signal transceiving device.

In order to achieve the above object, the technical solution of the present invention is achieved as follows:

The present invention provides a matching circuit, the matching circuit includes: an isolation module, a filtering module, and a matching module, wherein the filtering module is connected between the isolation module and the matching module, wherein the isolation module is configured to isolate a specified frequency a signal other than the specified frequency, a filtering module for filtering out signals other than the specified frequency, and a matching module for performing matching processing on the signal of the specified frequency.

The present invention also provides a matching circuit network, the 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, and the high frequency matching circuit includes: a first isolation module, a first filtering module, and a first matching module, wherein the first filtering module is connected to the Between the first isolation module and the first matching module, wherein the first isolation module is configured to isolate the low frequency signal and transmit the high frequency signal; the first filtering module is configured to filter out the signal other than the high frequency signal a first matching module, configured to perform matching processing on the high frequency signal; the low frequency transmission branch includes one or two low frequency matching circuits, and the low frequency matching circuit includes: a second isolation module, a second filtering module, and a a second matching module, the second filtering module is connected between the second isolation module and the second matching module, wherein the second isolation module is configured to isolate a high frequency signal and transmit a low frequency signal; And filtering the signal other than the low frequency signal; and the second matching module is configured to perform matching processing on the low frequency signal.

In the above solution, the first isolation module includes a first capacitor, the first filter module includes a first series resonant circuit, and the first matching module includes a third capacitor and a third inductor; The third capacitor is connected in series with the third inductor, and the third inductor is grounded, the first series resonant loop is grounded at one end, and one end of the first capacitor is respectively connected to the other end of the first series resonant loop and the third One end of the capacitor has the other end as one end of the high frequency matching circuit, and a connection point between the third capacitor and the third inductor serves as the other end of the high frequency matching circuit.

In the above solution, the first isolation module further includes a first inductor, and the first inductor is connected in parallel with the first capacitor; wherein, the formula between the first inductor and the first capacitor is satisfied:

^ C ^F , where L represents the inductance value of the first inductor, C represents the capacitance value of the first capacitor, and F represents the center frequency of the specified suppression band of the high frequency signal, which is lower than the passband frequency of the first isolation module .

In the above solution, the first series resonant tank includes a second inductor and a second capacitor connected in series, wherein the second inductor and the second capacitor satisfy a formula: ^F , where L represents an inductance of the second inductor The value C represents the capacitance value of the second capacitor, and F represents the center frequency of the specified suppression band of the high frequency signal, which is lower than the passband frequency of the first isolation module.

In the above solution, the second isolation module includes a fourth inductor, the second filter module includes a second series resonant circuit, and the second matching module includes the sixth inductor and the fifth capacitor;

The sixth inductor is connected in series with the fifth capacitor, and the fifth capacitor is grounded, the second series resonant loop is grounded at one end, and one end of the fourth inductor is respectively connected to the other end of the second series resonant loop One end of the sixth inductor is used, and the other end is used as one end of the low frequency matching circuit, and a connection point between the sixth inductor and the fifth capacitor is used as the other end of the low frequency matching circuit.

In the above solution, the second series resonant circuit includes a fifth inductor and a fourth capacitor connected in series, wherein the fifth inductor and the fourth capacitor satisfy a formula: ^F , where L represents an inductance of the fifth inductor The value C represents the capacitance value of the fourth capacitor, and F represents the center frequency of the specified suppression band of the low frequency signal, which is higher than the pass band frequency of the second isolation module. In the above solution, when the high frequency transmission circuit includes two high frequency matching circuits, the first matching modules of the two high frequency matching circuits are connected in series; and the low frequency transmission circuit includes two low frequency matching circuits. The 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: a low noise amplifier connected to the second matching module of the one low frequency matching circuit, or the second matching of the two low frequency matching circuits Between modules.

In the above scheme, the low noise amplifier operates when it is required to receive a low frequency signal and does not operate when it does not need to receive a low frequency signal.

In the above solution, the high frequency transmission branch further includes: a filter connected to the first matching module of the one high frequency matching circuit, or the first of the two high frequency matching circuits Match between modules.

The present invention also provides a signal transceiving device, the signal transceiving device comprising: an antenna, a matching circuit network, a first transceiver circuit and a second transceiver circuit, wherein the matching circuit network has a low frequency signal in the antenna and the Transmitting between a transceiver circuit, transmitting a high frequency signal between the antenna and the second transceiver 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, and the high frequency matching circuit includes: a first isolation module, a first filter a module and a first matching module, the first filtering module is connected between the first isolation module and the first matching module, wherein the first isolation module is configured to isolate a low frequency signal and transmit a high frequency signal; a filtering module, configured to filter out other signals than the high frequency signal; a first matching module, configured to perform matching processing on the high frequency signal; the low frequency transmission branch includes a low frequency matching circuit, the low frequency matching The circuit includes: a second isolation module, a second filtering module, and a second matching module, wherein the second filtering module is connected between the second isolation module and the second matching module, wherein the second isolation module is used The high frequency signal is isolated to transmit the low frequency signal; the second filtering module is configured to filter out the low frequency signal Other signals; a second matching module, configured to perform matching processing on the low frequency signal.

The present invention further provides a signal transceiving device, the signal transceiving device comprising: an antenna, at least one matching circuit network, and a transceiver circuit, wherein the at least one matching circuit network divides signals of a plurality of frequencies into high frequency signals and a low frequency signal, and respectively transmitted between the antenna and the transceiver circuit;

The matching circuit network includes: a high frequency transmission branch and a low frequency transmission branch; wherein the high frequency transmission branch includes two high frequency matching circuits connected in series, and the high frequency matching circuit includes: 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, wherein the first isolation module is configured to isolate a low frequency signal and transmit the high a frequency filtering signal; a first filtering module, configured to filter out other signals than the high frequency signal; and a first matching module, configured to perform matching processing on the high frequency signal;

The low frequency transmission branch includes two low frequency matching circuits connected in series, the low frequency matching circuit includes: a second isolation module, a second filtering module, and a second matching module, wherein the second filtering module is connected to the second isolation Between the module and the second matching module, wherein the second isolation module is configured to isolate the high frequency signal and transmit the low frequency signal; the second filtering module is configured to filter out the signal other than the low frequency signal; And a module, configured to perform matching processing on the low frequency signal.

In the above solution, the one matching circuit network is configured to divide the signals of the two frequencies into a high frequency signal or a low frequency signal; respectively, transmitting between the antenna and the transceiver circuit, or being connected by itself; The high frequency transmission branch or the low frequency transmission branch in the matching circuit network is transmitted.

The matching circuit, the matching circuit network and the signal transceiving device provided by the invention provide an isolation module for isolating signals outside the specified frequency and a filtering module for filtering out signals outside the designated frequency in the matching circuit, so that the matching circuit itself has The function of isolating the signal, so that the same single-frequency antenna can be achieved without using an antenna switch in the corresponding signal transceiver The purpose of multi-band reception is not only to reduce the complexity of the signal transceiving device, reduce the cost, and save hardware resources, but also eliminates the need for the switching process of the antenna switch during signal reception, thereby solving the problem of using the antenna switch in the prior art. In other cases, the multiplex signal cannot achieve the problem of simultaneous reception, and the signal reception efficiency is improved. DRAWINGS

1 is a schematic structural diagram of a signal transmitting and receiving apparatus in the prior art;

2 is a schematic diagram showing the structure of a low-frequency transmission branch in the signal transceiving device shown in FIG. 1. FIG. 3 is a schematic diagram showing the structure of a high-frequency transmission branch in the signal transceiving device shown in FIG. 1. FIG. 4 is a matching circuit of the present invention. Schematic diagram of the composition;

5 is a schematic diagram of a circuit structure of a high frequency matching circuit in a matching circuit network according to the present invention; FIG. 6 is a schematic diagram of another circuit structure of a high frequency matching circuit in a matching circuit network according to the present invention; FIG. 7 is a low frequency matching in a matching circuit network according to the present invention; FIG. 8 is a schematic structural diagram of a signal transmitting and receiving apparatus according to Embodiment 1 of the present invention; FIG. 9 is a schematic structural diagram of another signal transmitting and receiving apparatus according to Embodiment 1 of the present invention; FIG. 11 is a schematic structural diagram of another signal transmitting and receiving apparatus according to Embodiment 2 of the present invention; FIG. 12 is a schematic structural diagram of a signal transmitting and receiving apparatus according to Embodiment 3 of the present invention; Schematic;

Fig. 13 is a partial schematic structural view of a WCDMA system to which a signal transmitting and receiving apparatus of the present invention is applied. detailed description

The basic idea of the invention is: By improving the matching circuit of the antenna, the matching circuit has the function of isolating the high frequency signal or the low frequency signal, and the matching circuit for matching the low frequency signal can directly isolate the high frequency signal. Off, only the low frequency signal is transmitted to the transceiver circuit. For the matching circuit for matching the high frequency signal, the low frequency signal can be directly isolated, and only the high frequency signal is transmitted to the transceiver circuit. In this way, there is no need to use an antenna in the signal transceiving device. The switch can realize multi-band transceiving of a single antenna, thereby reducing the complexity of the signal transceiving device under the premise of ensuring the normal operation of the signal transceiving device.

A matching circuit of the present invention, as shown in FIG. 4, the matching circuit includes: an isolation module, a filtering module, and a matching module, wherein the filtering module is connected between the isolation module and the matching module, wherein the isolation module, The signal is used to isolate a signal other than the specified frequency, and the signal of the specified frequency is transmitted; the filtering module is configured to filter out signals other than the specified frequency to enhance the isolation effect of the matching circuit on signals other than the specified frequency; The signal of the specified frequency is matched.

Here, the signal of the specified frequency may be a high frequency signal of a specified frequency or a low frequency signal of a specified frequency. Here, the high frequency signal and the low frequency signal are relative concepts. For signals of two different frequency bands to be transmitted and received, the signal of the high frequency band is the high frequency signal, and the signal of the low frequency band is the low frequency signal. For example, for a W850 band signal and a W2100 band signal to be received in a Wideband Code Division Multiple Access (WCDMA) system, the W850 band signal is the above low frequency signal, and the W2100 band signal is the above high frequency signal. .

In addition, the present invention further provides a matching circuit network, the 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 circuit includes: 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, where An isolation module for isolating the low frequency signal and transmitting the high frequency signal; a first filtering module, configured to filter out the signal other than the high frequency signal; and a first matching module, configured to perform matching processing on the high frequency signal The low frequency transmission branch includes one or two low frequency matching circuits, and the low frequency matching circuit includes: a second isolation module, a second filtering module, and a second matching module, wherein the second filtering module is connected to the second isolation Between the module and the second matching module, wherein the second isolation module is configured to isolate the high frequency signal and transmit the low frequency signal; a filtering module, configured to filter out signals other than the low frequency signal; and a second matching module, configured to perform matching processing on the low frequency signal.

The first isolation module includes a first capacitor, the first filter module includes a first series resonant circuit, the first matching module includes a third capacitor and a third inductor, and the third capacitor is connected in series with the third inductor. And the third inductor is grounded, the first series resonant circuit is grounded at one end, and one end of the first capacitor is respectively connected to the other end of the first series resonant circuit and one end of the third capacitor, and the other end is used as the high A signal transmitting end of the frequency matching circuit, and a connection point between the third capacitor and the third inductor serves as another signal transmitting end of the high frequency matching circuit. The first series resonant tank includes an inductor and a capacitor connected in series.

Specifically, the high frequency matching circuit can have the following two circuit configurations:

The first type, as shown in FIG. 5, includes: 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 in series with the second capacitor C2 And the second capacitor C2 is connected to the ground, the third capacitor C3 is connected in series with the third inductor L3, and the third inductor L3 is grounded, and one end of the first capacitor C1 is used as the first high frequency matching circuit. One end and the other end are respectively connected to the second inductor L2 and the third capacitor C3, 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 includes the first capacitor C1, the first filter module includes the second inductor L2 and the second capacitor C2, and the first matching module includes the third capacitor C3 and the third inductor L3.

The second type, as shown in FIG. 6, includes: 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 The second capacitor C2 is connected in series, and the second capacitor C2 is grounded, the third capacitor C3 is connected in series with the third inductor L3, and the third inductor L3 is grounded, the first inductor L1 and the first capacitor C1 In parallel, one end of the first capacitor C1 serves as one end of the first high frequency matching circuit, and the other end is connected to the second inductor L2 and the third capacitor C3, respectively, and the third capacitor C3 and the third inductor L3 The connection point between them serves as the other end of the first high frequency matching circuit. Where the first isolation The module includes the first inductor L1 and the first capacitor C1, the first filter module includes the second inductor L2 and the second capacitor C2, and the first matching module includes the third capacitor C3 and the third inductor L3.

The second isolation module includes a fourth inductor, the second filter module includes a second series resonant circuit, the second matching module includes the sixth inductor and the fifth capacitor, and the sixth inductor is connected in series with the fifth capacitor. And the fifth capacitor is grounded, one end of the second series resonant circuit is grounded, and one end of the fourth inductor is respectively connected to the other end of the second series resonant circuit and one end of the sixth inductor, and the other end serves as a One end of the low frequency matching circuit, a connection point between the sixth inductance and the fifth capacitance is used as the other end of the low frequency matching circuit.

Specifically, the circuit structure of the low frequency matching circuit is as 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 The inductor L5 is connected in series with the fourth capacitor C4, and the second capacitor C4 is grounded, the sixth inductor L6 is connected in series with the fifth capacitor C5, and the fifth capacitor C5 is grounded, and one end of the fourth inductor L4 is One end of the first low frequency matching circuit 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 first low frequency matching circuit. another side. The second isolation module includes the fourth inductor L4, the second filter module includes the fifth inductor L5 and the fourth capacitor C4, and the second matching module includes the sixth inductor L6 and the fifth capacitor C5.

The first capacitor C1 is used to isolate the signal of the lower frequency band so as not to affect the operation of the high frequency band, and reduce the influence of the fifth inductance L5 and the fourth capacitance C4 on the second inductance L2 and the second capacitance C2; The four inductor L4 is used to isolate the signal of the higher frequency band so as not to affect the operation of the low frequency band, and reduce the influence of the second inductance L2 and the second capacitance C2 on the fifth inductance L5 and the fourth capacitance C4; the third capacitance C3 And the third inductor L3, the fifth capacitor C5 and the sixth inductor L6 are mainly used for realizing tuning of the signal, that is, performing matching processing; the second inductor L2 and the second capacitor C2 are used for filtering the low-band signal, and the first capacitor C1 together constitutes a high-pass filter; fifth inductor L5 and fourth capacitor C4 are used to filter out the high-band signal, and together with the fourth inductor L4 constitute a low-pass filter. Wherein, the first inductor LI and the first capacitor CI, the second inductor L2 and the second capacitor C2, and the fifth inductor L5 and the fourth capacitor C4 satisfy the 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 suppression band of the corresponding signal. Specifically, for the first inductor L1 and the first capacitor C1, and the second inductor L2 and the second capacitor C2, F represents a center frequency of the specified suppression band of the high frequency signal, which is lower than that of the first isolation module. With frequency. For the fifth inductor L5 and the fourth capacitor C4, F is a center frequency of a specified suppression band of the low frequency signal, higher than a passband frequency of the second isolation module.

In practical applications, for the high frequency matching circuit shown in FIG. 6, since the first inductance L1 is added, the higher frequency isolation effect is obtained compared to the first high frequency matching circuit, and the low frequency bandwidth is also narrowed. . Therefore, the second type of high frequency matching circuit is suitable for a case where the low frequency bandwidth is slightly narrow, for example, the case where the low frequency relative bandwidth is 40% or less.

Wherein, when the high frequency transmission circuit includes two high frequency matching circuits, the first matching modules of the two high frequency matching circuits are connected in series; when the low frequency transmission circuit includes two low frequency matching circuits, The second matching modules of the two low frequency matching circuits are connected in series.

Here, the low frequency transmission branch may further include: a low noise amplifier connected to the second matching module of the one low frequency matching circuit, or the second matching module of the two low frequency matching circuits between. The low noise amplifier operates when it is desired to receive low frequency signals and does not operate when it does not need to receive low frequency signals.

Here, the high frequency transmission branch may further include: a filter connected to the first matching module of the one high frequency matching circuit, or the first matching module of the two high frequency matching circuits between.

For example, for analog TV applications, when receiving signals with a frequency band greater than 160 MHz and signals with a frequency band less than 120 MHz, the two high-frequency matching circuits on the high-frequency transmission branch adopt the circuit structure shown in Figure 5, on the low-frequency transmission branch. Both low frequency matching circuits are shown in Figure 7. The circuit structure, then, its specific parameters can be: Cl = 22pF, C2 = 56pF, C3 = 22pF, C4 = 27pF, the specific parameters of C5 can be adjusted according to the specific circumstances, in this example C5 is vacant, L2 = 56nH, L3 The specific parameters can be adjusted according to the specific situation. In this example, L3 is vacant, L4 = 68nH, L5 = 22nH, L6 = 68nH.

In addition, the present invention further provides a signal transceiving device, the signal transceiving device comprising: an antenna, a matching circuit network, a first transceiver circuit and a second transceiver circuit, wherein the matching circuit network has a low frequency signal at the antenna Transmitting with the first transceiver circuit to transmit a high frequency signal between the antenna and the second transceiver 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, and the high frequency matching circuit includes: a first isolation module, a first filter a module and a first matching module, the first filtering module is connected between the first isolation module and the first matching module, wherein the first isolation module is configured to isolate a low frequency signal and transmit a high frequency signal; a filtering module, configured to filter out other signals than the high frequency signal; a first matching module, configured to perform matching processing on the high frequency signal; the low frequency transmission branch includes a low frequency matching circuit, the low frequency matching The circuit includes: a second isolation module, a second filtering module, and a second matching module, wherein the second filtering module is connected between the second isolation module and the second matching module, wherein the second isolation module is used The second high-frequency signal is transmitted to transmit a low-frequency signal; the second filtering module is configured to filter out other signals than the low-frequency signal; Means for matching the low-frequency signal processing.

The present invention further provides another signal transceiving device, the signal transceiving device comprising: an antenna, at least one matching circuit network, and a transceiver circuit, wherein the at least one matching circuit network divides signals of multiple frequencies into high frequency signals And low frequency signals, and respectively transmitted between the antenna and the transceiver circuit;

The matching circuit network includes: a high frequency transmission branch and a low frequency transmission branch; wherein the high frequency transmission branch includes two high frequency matching circuits connected in series, and the high frequency matching circuit includes: 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, wherein the first isolation module is configured to isolate the low frequency a signal, a high frequency signal is transmitted; a first filtering module, configured to filter out other signals than the high frequency signal; a first matching module, configured to perform matching processing on the high frequency signal; and the low frequency transmission branch includes Two low frequency matching circuits connected in series, the low frequency matching circuit includes: a second isolation module, a second filtering module, and a second matching module, wherein the second filtering module is connected to the second isolation module and the second matching Between the modules, wherein the second isolation module is configured to isolate the high frequency signal and transmit the low frequency signal; the second filtering module is configured to filter out the signal other than the low frequency signal; and the second matching module is configured to The low frequency signal is matched.

Wherein, the one matching circuit network is configured to divide the signals of the two frequencies into high frequency signals or low frequency signals; and respectively, transmit between the antennas and the transceiver circuits, or connect with other ones connected by themselves; The high frequency transmission branch or the low frequency transmission branch in the circuit network is transmitted.

Embodiment 1

The signal transceiving device in this embodiment, as shown in FIG. 8, mainly includes: an antenna, a high frequency transmission branch, a low frequency transmission branch, a first transceiver circuit, and a second transceiver circuit, wherein the high frequency transmission branch and the low frequency transmission a branch is connected in parallel between the antenna and the first transceiver circuit and the second transceiver circuit, an input end of the high frequency transmission branch, and an input end of the low frequency transmission branch are connected to the antenna, the high frequency transmission branch The output end of the circuit is connected to the second transceiver circuit, and the output end of the low frequency transmission branch is connected to the first transceiver circuit.

Wherein, the high frequency transmission branch includes a first high frequency matching circuit, and the low frequency transmission branch includes a first low frequency matching circuit. The second transceiver circuit is configured to transmit and receive signals transmitted via the high frequency transmission branch.

Here, the first high frequency matching circuit is identical in structure to the high frequency matching circuit described above, wherein the first high frequency matching circuit has an input end of the first isolation module as its own input end. The output of the first matching module is used as its own output.

The first low frequency matching circuit has the same structure as the low frequency matching circuit described above, wherein the first low frequency matching circuit has the input end of the second isolation module as its own input end and the output end of the second matching module as Its own output.

In the signal transceiving device in this embodiment, a low noise amplifier can also be added in the low frequency transmission branch, and a filter can be added in the high frequency transmission branch, and the signal transceiving device after adding the low noise amplifier and the filter is as shown in FIG. 9. As shown, wherein the input end of the low noise amplifier is connected to the output end of the first low frequency matching circuit, and the output end is connected to the input end of the first transceiver circuit, the low noise amplifier works when it needs to receive the low frequency signal, and does not need to receive the low frequency The signal does not work. Specifically, the low noise amplifier is controlled by a baseband chip, and the baseband chip is powered by the low noise amplifier when the low frequency signal needs to be received, so that the low noise amplifier operates; the baseband chip does not need to receive a low frequency signal. At the time, the power is turned off for the low noise amplifier, so that the low noise amplifier does not operate. Thus, by turning on and off the low noise amplifier, the isolation of the high frequency signal by the low frequency transmission branch can be enhanced, so that the high frequency reception and the low frequency reception can be time-divisionally unaffected.

If the high frequency matching circuit has poor isolation effect on the low frequency or needs better isolation effect, a filter may be added on the high frequency transmission branch, and the input end of the filter is connected to the first high frequency matching. An output end of the circuit is connected to the input end of the second transceiver circuit for filtering out interference signals and preventing self-oscillation of the low noise amplifier. Moreover, by adding a filter, the isolation of the low frequency signal by the high frequency transmission branch can be enhanced, so that the high frequency reception and the low frequency reception can be time-divisionally unaffected, and the mutual influence can be reduced at the same time.

Specifically, when the antenna receives a low frequency electrical signal, the low noise amplifier operates and the electrical signal passes through the low frequency transmission branch to the first transceiver circuit. When the antenna receives a high frequency electrical signal, the low noise amplifier does not operate and the electrical signal reaches the second transceiver circuit via the high frequency transmission branch.

In this embodiment, by adding a low noise amplifier on the low frequency transmission branch, and at a high frequency Adding a filter on the transmission branch can make the isolation between the high-frequency signal and the low-frequency signal greater than 20dB, which can fully achieve the performance that the antenna switch can achieve.

This embodiment is applied to the case of a dual receiver.

Embodiment 2

The signal transceiving device in this embodiment, as shown in FIG. 10, mainly includes: an antenna, a high frequency transmission branch, a low frequency transmission branch, and a transceiver circuit, wherein the high frequency transmission branch and the low frequency transmission branch are connected in parallel to the antenna An input end of the high frequency transmission branch and an input end of the low frequency transmission branch are connected to the transceiver circuit, and an output end is connected to the transceiver circuit. The high frequency transmission branch includes a first high frequency matching circuit and a second high frequency matching circuit, and the low frequency transmission branch includes a first low frequency matching circuit and a second low frequency matching circuit, and the transceiver circuit is configured to receive the high frequency signal and the low frequency signal, The first high frequency matching circuit is connected in series with the second high frequency matching circuit, the first high frequency matching circuit is connected to the antenna, and the second high frequency matching circuit is connected to the transceiver circuit; the first low frequency matching circuit is connected in series with the second low frequency matching circuit The first low frequency matching circuit is connected to the antenna, and the second low frequency matching circuit is connected to the transceiver circuit.

Here, the composition of the first high frequency matching circuit and the second high frequency matching circuit are exactly the same as those of the high frequency matching circuit described above, and are not described again, wherein the first high frequency matching circuit is described above. The input end of the first isolation module serves as its own output end, and the second high frequency matching circuit uses the input end of the first matching module as its own input end, The output of the first isolation module serves as its own output.

The structure of the first low-frequency matching circuit and the second low-frequency matching circuit are the same as those of the high-frequency matching circuit described above, and are not described again. The first low-frequency matching circuit is the second isolation module. The input end serves as its own input end, the output end of the second matching module serves as its own output end, and the second low frequency matching circuit uses the input end of the second matching module as its own input end, and the second isolation module The output is used as its own output. Similarly, the signal transceiving device in this embodiment can also add a low noise amplifier in the low frequency transmission branch, add a filter in the high frequency transmission branch, and add a signal transmission device after the low noise amplifier and the filter as shown in FIG. Show. The low noise amplifier is coupled between the first low frequency matching circuit and the second low frequency matching circuit, the filter being coupled between the first high frequency matching circuit and the second high frequency matching circuit. Specifically, an input end of the filter is connected to the first high frequency matching circuit, and an output end is connected to the second high frequency matching circuit. The input of the low noise amplifier is connected to the first low frequency matching circuit, and the output end is connected to the second low frequency matching circuit.

The low-noise amplifier works when it needs to receive the low-frequency signal, and does not work when it is not required to receive the low-frequency signal. The specific implementation process is the same as that in the first embodiment, and will not be described again.

Embodiment 3

In a practical application, the high-frequency transmission branch and the low-frequency transmission branch of the signal transceiver device in the second embodiment may be separately subdivided, and the received signal of the antenna is matched and transmitted through four branches, and the The effects of the single-frequency antennas matching the four frequency bands respectively increase the bandwidth of the antenna.

As shown in FIG. 12, the signal transceiving device in this embodiment includes three matching circuit networks, wherein one is a first-level matching circuit network, and the other two are two-level matching circuit networks, and the low-frequency transmission in the first-level matching circuit network. The branch circuit comprises a first low frequency matching circuit and a second low frequency matching circuit, wherein the high frequency transmission branch comprises a first high frequency matching circuit and a second high frequency matching circuit; two second matching circuit networks are respectively connected at the first level The high frequency transmission branch and the low frequency transmission branch of the matching circuit network.

Wherein, in the network of the two-level matching circuit connected to the high-frequency transmission branch of the first-level matching circuit network, the low-frequency transmission branch includes a fifth low-frequency matching circuit and a sixth low-frequency matching circuit, The signals of the two frequency bands in the high frequency signal on the high frequency transmission branch of the matching circuit network are subdivided into high frequency signals and low frequency signals, and matched at the first level through their own high frequency transmission branches and low frequency transmission branches respectively. High frequency transmission branch transmission in circuit network; high frequency transmission branch The circuit includes a fifth high frequency matching circuit and a sixth high frequency matching circuit;

Connected to the secondary matching circuit network on the high frequency transmission branch of the first level matching circuit network, for subdividing the signals of the two frequency bands in the high frequency signal of the low frequency transmission branch of the first level matching circuit network The high frequency signal and the low frequency signal are respectively transmitted through the low frequency transmission branch in the first matching circuit network through the own high frequency transmission branch and the low frequency transmission branch; the low frequency transmission branch includes the third low frequency matching circuit And a fourth low frequency matching circuit, the high frequency transmission branch comprising a third high frequency matching circuit and a fourth high frequency matching circuit.

Specifically, the structure of each high-frequency matching circuit is exactly the same as that of the high-frequency matching circuit described above, and details are not described herein, wherein the first high-frequency matching circuit, the third high-frequency matching circuit, and the fifth high-frequency matching circuit are respectively omitted. The input end of the first isolation module is used as its own input end, the output end of the first matching module is used as its own output end, the second high frequency matching circuit, the fourth high frequency matching circuit, and the sixth high frequency The matching circuit has an input end of the first matching module as its own input end, and an output end of the first isolation module as its own output end.

The structure of each low-frequency matching circuit is exactly the same as that of the low-frequency matching circuit described above, and is not described again, wherein the first low-frequency matching circuit, the third low-frequency matching circuit, and the fifth low-frequency matching circuit are all in the second isolation module. The input end serves as its own input end, and the output end of the second matching module serves as its own output end, and the second low frequency matching circuit, the fourth low frequency matching circuit, and the sixth low frequency matching circuit are input by the second matching module The terminal serves as its own input terminal, and the output terminal of the second isolation module serves as its own output terminal.

In this embodiment, the structure of the signal processing apparatus is similar to that of the second embodiment, except that the high frequency transmission branch and the low frequency transmission branch respectively receive signals of two specified frequency bands by adding branches. For example, if you need to receive signals from the four bands of GSM1800/1900 and GSM850/900, you can specify the GSM1800/1900 signal as the high frequency signal, the GSM850/900 signal as the low frequency signal, and the GSM1800/1900 signal from the high frequency transmission branch. The transmitting branch receives the GSM850/900 band signal. Specifically, the GSM1800/1900 signal is received in the high frequency transmission branch Receiving, by the second high frequency receiving sub-branch, the GSM 1900 signal, receiving the GSM 1800 signal via the second low frequency receiving sub-branch, and receiving the GSM 850/900 signal in the low-frequency transmitting branch, receiving the GSM 900 via the first high-frequency receiving sub-branch The signal receives the GSM850 signal via the first low frequency receiving sub-branch.

In this embodiment, a low noise amplifier can be added to the low frequency transmission branch and each low frequency receiving sub-branch, and the low noise amplifier can be disposed between the two low frequency matching circuits on the branch. Correspondingly, the high frequency transmission branch and the high frequency receiving sub-branch may also be provided with a filter, which is disposed between the two high frequency matching circuits on the branch, and will not be described again.

Similarly, if you need to receive signals from six frequency bands, you can also set up a matching circuit network in one of the two-level matching circuit networks. If you need to receive signals from eight frequency bands, you can also match two of them in the second level. The matching circuit network is set in the circuit network, and so on. The specific implementation process is similar to the above process, and will not be described again.

Embodiment 4

This embodiment specifically describes the application of the signal transceiving device provided by the present invention.

As shown in FIG. 13 , which is a block diagram of a WCDMA system having a GSM850/900/1800/1900 frequency band and a W850/1900/2100 frequency band, the signal transceiving device in the above first embodiment is applied in FIG. 13 to distinguish between the W850 frequency band and the W2100 frequency band. .

Specifically, the common branch of the W850/2100 is respectively connected to the high frequency matching circuit and the low frequency matching circuit, wherein the transmission signal of the W2100 is generated by the transmitting portion of the RF transceiver chip, and then transmitted to the power amplifier (PA, Power Amplifier) of the W2100. After amplification, the amplified signal passes through the W2100 duplexer (including the above filter), reaches the high frequency matching circuit, and is transmitted to the antenna through the antenna switch to be transmitted to the space. The receiving signal of W2100 passes through the antenna switch, reaches the high frequency matching circuit, and reaches the W2100 transceiver circuit of the RF transceiver chip via the duplexer (including the above filter). The transmit signal of the W850 is generated by the transmitting part of the RF transceiver chip, and then transmitted to the W850's power amplifier for amplification. The amplified signal is passed through the W850 duplexer (including the above filter). Waves), reaching the low frequency matching circuit, transmitted to the antenna through the antenna switch and transmitted to the space. The receiving signal of the W850 passes through the antenna switch, reaches the low frequency matching circuit, and reaches the W850 transceiver circuit of the RF transceiver chip via the duplexer (including the above filter). In this way, the W2100 band signal and the W850 band signal can be received without setting the antenna switch after the shared branch of the W850/2100.

Specifically, in this embodiment, the low frequency matching circuit adopts the circuit structure shown in FIG. 7, and the high frequency matching circuit can adopt the circuit structure shown in FIG. 6. The specific parameters can be: Cl=4.7pF, C2=4.7pF, C3 = 5.6pF, C4 = 2.2pF, the specific parameters of C5 are adjusted according to the circuit condition. In this example, C5 is vacant, Ll = 6.8nH, L2 = 6.8nH, and the specific parameters of L3 are adjusted according to the circuit conditions. In this example, C5 is vacant, L4 = 6.8nH, L5 = 2.2nH, L6 = 6.8nH.

After measurement, when the W2100 signal and W850 signal are received in the above manner, the isolation is better than 20dB. The receiving loss of the W850 band is 0.5-0.6dB, and the receiving loss of the W2100 band is 0.22-0.3dB. It can be seen that the signal transceiving device of the invention can not only save the antenna switch, reduce the system complexity, but also achieve high isolation and Low loss.

The above is only the preferred embodiment of the present invention and is not intended to limit the scope of the present invention.

Claims

A matching circuit, wherein the matching circuit comprises: an isolation module, a filtering module, and a matching module, wherein the filtering module is connected between the isolation module and the matching module, wherein the isolation module is used for isolating a signal other than the designated frequency, the signal of the specified frequency is transmitted; a filtering module is configured to filter out the signal other than the specified frequency; and a matching module is configured to perform matching processing on the signal of the specified frequency.

2. A matching circuit network, wherein the matching circuit network comprises: a high frequency transmission branch and a low frequency transmission branch, wherein

The matching circuit network according to claim 2, wherein the first isolation module comprises a first capacitor, the first filtering module comprises a first series resonant circuit, and the first matching module comprises a third Capacitor and third inductance;

The third capacitor is connected in series with the third inductor, and the third inductor is grounded, the first series resonant circuit is grounded at one end, and one end of the first capacitor is respectively connected to the other end of the first series resonant circuit and One end of the three capacitors has the other end as one end of the high frequency matching circuit, and a connection point between the third capacitor and the third inductor serves as the other end of the high frequency matching circuit.

The matching circuit network according to claim 3, wherein the first isolation module further includes a first inductor, the first inductor is connected in parallel with the first capacitor; wherein, the first inductor and The formula is satisfied between the first capacitors: where L represents the inductance value of the first inductor, C represents the capacitance value of the first capacitor, and F represents the center frequency of the specified suppression frequency band of the high frequency signal, which is lower than the first isolation module Passband frequency.

The matching circuit network according to claim 3, wherein the first series resonant circuit comprises a second inductor and a second capacitor connected in series, wherein the second inductor and the second capacitor meet Formula: ^F , where L represents the inductance value of the second inductor, C represents the capacitance value of the second capacitor, and F represents the center frequency of the specified suppression band of the high frequency signal, which is lower than the passband frequency of the first isolation module .

The matching circuit network according to claim 2, wherein the second isolation module comprises a fourth inductance, the second filtering module comprises a second series resonant circuit, and the second matching module comprises the sixth inductance and Fifth capacitor

The matching circuit network according to claim 6, wherein the second series resonant circuit comprises a fifth inductor and a fourth capacitor connected in series, wherein the fifth inductor and the fourth capacitor meet Formula: ^F , where L represents the inductance value of the fifth inductance, C represents the capacitance value of the fourth capacitance, and F represents the center frequency of the specified suppression frequency band of the low frequency signal, which is higher than the passband frequency of the second isolation module.

8. A matching circuit network according to any one of claims 2 to 7, characterized in that When the high frequency transmission circuit includes two high frequency matching circuits, the first matching modules of the two high frequency matching circuits are connected in series;

When the low frequency transmission circuit includes two low frequency matching circuits, the second matching modules of the two low frequency matching circuits are connected in series.

The matching circuit network according to any one of claims 2 to 7, wherein the low frequency transmission branch further comprises: a low noise amplifier, wherein the low noise amplifier is connected to the first low frequency matching circuit On the two matching modules, or between the two matching modules of the two low frequency matching circuits.

10. The matching circuit network according to claim 8, wherein the low noise amplifier operates when it is required to receive a low frequency signal and does not operate when it is not required to receive the low frequency signal.

The matching circuit network according to any one of claims 2 to 7, wherein the high frequency transmission branch further comprises: a filter, wherein the filter is connected to the first high frequency matching circuit On a matching module, or between the first matching modules of the two high frequency matching circuits.

12. A signal transceiving device, wherein: the signal transceiving device comprises: an antenna, a matching circuit network, a first transceiver circuit, and a second transceiver circuit, wherein the matching circuit network has a low frequency signal at the antenna and Transmitting between the first transceiver circuits, transmitting a high frequency signal between the antenna and the second transceiver 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, and the high frequency matching circuit includes: a first isolation module, a first filter a module and a first matching module, the first filtering module is connected between the first isolation module and the first matching module, wherein the first isolation module is configured to isolate a low frequency signal and transmit a high frequency signal; a filtering module, configured to filter out other signals than the high frequency signal; a first matching module, configured to perform matching processing on the high frequency signal; the low frequency transmission branch includes a low frequency matching circuit, the low frequency matching The circuit includes: a second isolation module, a second filtering module, and a second matching module, where the second filtering module is connected Between the second isolation module and the second matching module, wherein the second isolation module is configured to isolate the high frequency signal and transmit the low frequency signal; and the second filtering module is configured to filter out the signal other than the low frequency signal. And a second matching module, configured to perform matching processing on the low frequency signal.

A signal transceiving device, comprising: an antenna, at least one matching circuit network, and a transceiver circuit, wherein the at least one matching circuit network divides signals of a plurality of frequencies into high frequency signals And low frequency signals, and respectively transmitted between the antenna and the transceiver circuit;

14. The signal transceiving device according to claim 13, wherein:

The matching circuit network is configured to divide the signals of the two frequencies into high frequency signals or low frequency signals; respectively, between the antennas and the transceiver circuits, or in other matching circuit networks connected to them Transmission on the high frequency transmission branch or low frequency transmission branch.