CN210351161U

CN210351161U - Radio frequency switch matrix

Info

Publication number: CN210351161U
Application number: CN201921424450.8U
Authority: CN
Inventors: 刘奎鹏
Original assignee: Beijing Dahua Hengwei Communication Technology Co ltd
Current assignee: Beijing Dahua Hengwei Communication Technology Co ltd
Priority date: 2019-08-30
Filing date: 2019-08-30
Publication date: 2020-04-17
Anticipated expiration: 2029-08-30

Abstract

The utility model relates to a radio frequency switch matrix, including power module, power module is connected with reference source module, amplification module, control module respectively, and control module even has the switching module, and the switching module even has the isolator, and amplification module links to each other with the switching module, and reference source module links to each other with amplification module, and reference source module links to each other with control module. The utility model discloses can overcome other matrix isolation to a certain extent and hang down, the poor and low not enough of linearity of flatness.

Description

Radio frequency switch matrix

Technical Field

The utility model relates to a communication system field particularly, relates to a radio frequency switch matrix.

Background

The switch matrix can realize the cross intercommunication function of M-path antenna input and N-path receivers. In the field of communication systems, the switch matrix plays an important role in connecting an antenna end and a receiver, and can perform full-exchange interconnection and intercommunication, thereby effectively increasing the flexibility of the system.

As technology continues to develop, the performance requirements for switch matrices are also increasing. After the antenna receiving signals pass through the switch matrix, if the isolation between the matrix paths is low, signal crosstalk between the paths can be caused, and the analysis of the receiver on the antenna signals is influenced. Meanwhile, the nonlinear index difference of the matrix also influences the analysis of the antenna signals, and information carried by the signals received by the antenna cannot be completely restored, so that the communication quality is influenced.

An effective solution to the problems in the related art has not been proposed yet.

SUMMERY OF THE UTILITY MODEL

To the above-mentioned technical problem among the correlation technique, the utility model provides a radio frequency switch matrix can overcome other matrix isolation to a certain extent and hang down, the poor and low not enough of linearity of flatness.

In order to achieve the technical purpose, the technical scheme of the utility model is realized as follows:

a radio frequency switch matrix comprises a power supply module, wherein the power supply module is respectively connected with a reference source module, an amplification module and a control module, the control module is connected with a switching module, the switching module is connected with an isolator, the amplification module is connected with the switching module, the reference source module is connected with the amplification module, and the reference source module is connected with the control module.

Furthermore, the amplifying module, the switching module and the isolator are N paths, each path of the amplifying module, the switching module and the isolator are sequentially connected, each path of the amplifying module is connected with the reference source module and the power supply module, and each path of the switching module is connected with the control module.

Furthermore, the amplifying module comprises a combiner and an amplifier, an output port of the combiner is connected with an input port of the amplifier, and the combiner is designed by adopting a high-low pass filter.

Further, the switching module comprises a 1-division-N power divider, an M-selection-1 switch, a numerical control attenuator and an amplifier which are sequentially connected, wherein the M-selection-1 switch is designed to be an SPDT switch and an SPST switch cascade connection, and the numerical control attenuator is a 30dB attenuation range numerical control attenuator.

Further, the reference source module comprises an SPDT switch, an amplifier, a 1-division M power divider, a crystal oscillator and an operational amplifier which are connected in sequence.

Furthermore, the AC-DC module of the power module converts an alternating current power supply into a direct current power supply, and then secondary voltage stabilization is carried out through the DC-DC and the low-dropout voltage stabilizer.

Furthermore, the control module is composed of a single chip microcomputer, a voltage stabilizing circuit and a communication circuit.

The utility model has the advantages that: the input and output channel switching, signal level adjustment, input port feed control and internal and external reference switching can be performed through the remote communication control equipment. The device M input ports externally feed 10MHz reference signals and +15VDC, so that the reference signals and power supply voltages required by the upper-level LNB device can be provided for the upper-level LNB device in the whole communication system, and meanwhile, the reference signals can be provided by the device per se or can be externally input. Each path of signal is output with a gain adjustment range of 30dB, so that each path of receiver has the same input signal power.

The utility model discloses mainly have input/output signal switching function, can provide reference signal and power, each way output signal gain is adjustable, inside reference signal stability is high and the frequency can be finely tuned for LNB (satellite tuner). The method has the characteristics of high isolation between paths, large power adjustment range, small in-band flatness, high linearity and the like.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a circuit diagram of a radio frequency switch matrix according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art all belong to the protection scope of the present invention.

As shown in fig. 1, according to the embodiment of the present invention, a radio frequency switch matrix, including amplifying module, switching module, reference source module, control module and power module, amplifying module output port with switching module input port connection, reference source module output port with amplifying module reference input port connection, control module with reference source module and switching module's data interface link to each other.

In a preferred embodiment, the amplifying module is composed of a combiner and an amplifier, the output port of the combiner is connected with the input port of the amplifier, and the combiner inputs a radio frequency signal and simultaneously couples a 10MHz reference signal and a +15VDC power supply output.

In a preferred embodiment, the switching module is composed of a 1-division-N power divider, a 1-from-M switch, a numerical control attenuator, and an amplifier, wherein an output end of the 1-division-N power divider is connected with an input end of the 1-from-M switch, an output end of the 1-from-M switch is connected with an input end of the numerical control attenuator, and an output end of the numerical control attenuator is connected with an input end of the amplifier.

In a preferred embodiment, the reference source module is composed of an SPDT switch, an amplifier, a 1-minute M power divider, a crystal oscillator and an operational amplifier. One input end of the SPDT switch is connected with the output end of the crystal oscillator, the output end of the operational amplifier is connected with the voltage-controlled end of the crystal oscillator, the output end of the SPDT switch is connected with the input end of the amplifier, and the output end of the amplifier is connected with the input end of the 1-minute M power divider.

In a preferred embodiment, the control module mainly comprises a single chip microcomputer, a voltage stabilizing circuit and a communication circuit.

In a preferred embodiment, the power supply module is mainly composed of an AC-DC, a DC-DC and an LDO voltage stabilizing block.

For the convenience of understanding the above technical solutions of the present invention, the above technical solutions of the present invention are explained in detail below through the working principle and the specific using mode.

The working principle is as follows: the amplifying module is composed of a combiner and an amplifier, the output port of the combiner is connected with the input port of the amplifier, and the combiner adopts a high-low pass filter design to separate low-frequency signals from high-frequency signals. The amplifier is used for meeting the gain required by the equipment, reducing the noise of the equipment and improving the linearity.

The switching module consists of a 1-to-N power divider, an M-to-1 switch, a numerical control attenuator and an amplifier. The switch design SPDT switch and the SPST switch are cascaded, and a physical separation cavity is adopted to thoroughly separate M paths of the switch, so that high isolation design indexes are realized. The numerical control attenuator selects a 30dB attenuation range numerical control attenuator to realize the control of the power level of each output path.

The reference source module consists of an SPDT switch, an amplifier, a 1-minute M power divider, a crystal oscillator and an operational amplifier. The reference source module can realize the selection function of the internal and external reference signals, and when the internal reference source is selected, the frequency of the reference signal can be finely adjusted.

The control module mainly realizes the remote communication of the equipment and the remote control and detection functions of the equipment.

The power supply module is designed for secondary voltage stabilization, an AC-DC module converts an alternating current power supply into a direct current power supply, and then secondary voltage stabilization is carried out through a DC-DC and low-dropout voltage stabilizer. The problem of crosstalk between power clutter and signals can be effectively suppressed through a secondary voltage stabilization design.

When the radio frequency signal switching device is used specifically, a radio frequency signal is firstly input into the amplifying module, is amplified by the amplifying module and then is input into the switching module, and meanwhile, an input port of the amplifying module is coupled to output a 10MHz reference signal and +15VDC power supply voltage. The switching module realizes the full switching function and the signal power level adjustment function of input and output signals and finally outputs the signals through an output port of the equipment. The reference source module provides a 10MHz reference signal, and can realize the functions of internal and external reference source selection and reference frequency adjustment. The control module controls the channel switching and the level adjustment of the switching module, and simultaneously controls the reference source selection and the frequency adjustment of the reference source module, thereby realizing the external remote communication function. The power supply module provides power supply voltage for each module in the equipment.

To sum up, the utility model discloses an use the special amplifier module circuit of design and switch the module circuit, reached input/output full switching, input port coupling output 10MHz reference signal and +15VDC mains voltage, have characteristics such as the isolation is high, the flatness is little, the linearity is high and the gain is controllable. All the designs improve the overall performance of the equipment.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A radio frequency switch matrix comprises a power supply module and is characterized in that the power supply module is respectively connected with a reference source module, an amplification module and a control module, the control module is connected with a switching module, the switching module is connected with an isolator, the amplification module is connected with the switching module, the reference source module is connected with the amplification module, and the reference source module is connected with the control module.

2. The radio frequency switch matrix according to claim 1, wherein the amplifying module, the switching module, and the isolator are all N paths, and each path of the amplifying module, the switching module, and the isolator are connected in sequence, each path of the amplifying module is connected to a reference source module and a power supply module, and each path of the switching module is connected to a control module.

3. The rf switch matrix of claim 2, wherein the amplifying module comprises a combiner and an amplifier, the output port of the combiner is connected to the input port of the amplifier, and the combiner is designed with a high-low pass filter.

4. The radio frequency switch matrix according to claim 3, wherein the switching module comprises a 1-out-of-N power divider, a 1-out-of-M switch, a digitally controlled attenuator, and an amplifier, which are connected in sequence, the 1-out-of-M switch is designed as a cascade of an SPDT switch and an SPST switch, and the digitally controlled attenuator is a 30dB attenuation range digitally controlled attenuator.

5. The RF switch matrix of claim 4, wherein the reference source module comprises an SPDT switch, an amplifier, a 1-M power divider, a crystal oscillator and an operational amplifier connected in sequence.

6. The RF switch matrix of claim 5, wherein the power module converts AC power to DC power through the AC-DC module and then performs secondary voltage stabilization through the DC-DC and low dropout voltage regulators.

7. The RF switch matrix of claim 6, wherein the control module comprises a single chip, a voltage regulator circuit and a communication circuit.