Two-channel intermediate frequency receiving module

Abstract

The utility model discloses a dual-channel intermediate frequency receiving module, comprising a control unit which is respectively connected with two intermediate frequency receiving channels. The intermediate frequency receiving channel comprises a mode selection unit, an attenuation amplification unit, a bandwidth selection unit and an amplification filtering unit; the mode selection unit, the attenuation amplification unit, the bandwidth selection unit and the amplification filtering unit are connected in sequence. According to the utility model, the external control signal is received through the control unit, so that the gain and bandwidth of the two intermediate frequency receiving channels can be adjusted in real time, different signal strength and frequency requirements can be met, and better receiving performance can be provided; the design of each module can perform optimization processing on different types of intermediate frequency signals, thereby improving the quality and anti-interference capability of the signals. Through the arrangement of the bandwidth selection unit, unnecessary frequency components can be effectively filtered out, the sensitivity and frequency selectivity of the system are improved, and the receiving effect of a target signal is enhanced.

Description

Technical Field

[0001] This utility model belongs to the field of microwave communication technology, specifically a dual-channel intermediate frequency receiving module. Background Technology

[0002] Microwave communication is a communication method that uses microwave frequencies for information transmission. It can be used in various environments, including wireless and wired transmission, and common applications include satellite communication, radio, television broadcasting, and point-to-point links. Because it uses high-frequency bands, microwave communication supports multiplexing technology, improving channel utilization. Compared to low-frequency communication, microwave signals are less susceptible to electrical interference, resulting in relatively higher transmission quality.

[0003] In the prior art, for example, the solution described in patent publication number CN215300626U is a multi-channel microwave transceiver assembly with an operating frequency range of 2-18 GHz. This assembly includes an acquisition unit, an interference channel unit, a direction-finding channel unit, and a local oscillator unit. The acquisition unit consists of a second FPGA unit, a DAC module, an ADC module, and a first FPGA unit connected thereto. The interference channel unit has four sets of receiving channels and one set of transmitting channels. The direction-finding channel also includes four sets of receiving channels, similarly connected to the first FPGA unit.

[0004] In existing technologies, when intermediate frequency (IF) receiving circuits achieve high gain and a large receiving dynamic range, a large circuit size is required. Furthermore, high-gain IF receiving circuits are highly susceptible to self-oscillation. The main pathway for self-oscillation is that high link gain can easily generate positive feedback loops within the product, leading to continuous signal enhancement and superposition, resulting in oscillation. Utility Model Content

[0005] The purpose of this invention is to provide a dual-channel intermediate frequency (IF) receiver module to solve the problem mentioned in the background art, where the high-gain IF receiver circuit is prone to self-oscillation when achieving high gain and large receiving dynamic range.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0007] A dual-channel intermediate frequency (IF) receiver module includes a control unit, which is connected to two IF receiver channels respectively. The control unit is used to receive external control signals, provide control codes for the two IF receiver channels, and then switch the channel gain and bandwidth selection.

[0008] The intermediate frequency receiving channel includes a mode selection unit, an attenuation amplification unit, a bandwidth selection unit, and an amplification and filtering unit; wherein, one end of the mode selection unit is connected to the control unit, and the other end of the mode selection unit is connected to the attenuation amplification unit, and the attenuation amplification unit, the bandwidth selection unit, and the amplification and filtering unit are connected in sequence.

[0009] The intermediate frequency signal is output after being processed by the amplification and filtering unit.

[0010] According to the above technical solution, the mode selection unit includes a first switch, a first amplifier, and a second switch; wherein, pin 1 of the first switch is used for intermediate frequency input, pin 2 of the first switch is connected to one end of the first amplifier, and the other end of the first amplifier is connected to pin 1 of the second switch.

[0011] Pin 3 of the first switch is connected to pin 2 of the second switch, and pin 3 of the second switch is connected to the attenuation and amplification unit.

[0012] According to the above technical solution, the attenuation amplification unit includes a first digitally controlled attenuator, a second amplifier, and a second digitally controlled attenuator.

[0013] One end of the first numerically controlled attenuator is connected to pin 3 of the second switch of the mode selection unit; the other end of the first numerically controlled attenuator is connected to one end of the second amplifier, the other end of the second amplifier is connected to one end of the second numerically controlled attenuator, and the other end of the second numerically controlled attenuator is connected to the bandwidth selection unit.

[0014] According to the above technical solution, the bandwidth selection unit includes a third switch, a fourth switch, a first filter, and a second filter;

[0015] Pin 1 of the third switch is connected to the second digitally controlled attenuator of the attenuation amplification unit; pin 2 of the third switch is connected to one end of the first filter, the other end of the first filter is connected to pin 1 of the fourth switch, pin 3 of the third switch is connected to one end of the second filter, and the other end of the second filter is connected to pin 2 of the fourth switch.

[0016] Pin 3 of the fourth switch is connected to the amplification and filtering unit.

[0017] According to the above technical solution, the amplification and filtering unit includes a third amplifier and a third filter; wherein, one end of the third amplifier is connected to the fourth switch of the bandwidth selection unit;

[0018] The other end of the third amplifier is connected to one end of the third filter, and the other end of the third filter is used for outputting the output signal.

[0019] According to the above technical solution, the control unit includes two serial-to-parallel conversion chips. One end of each serial-to-parallel conversion chip is used to receive the input of control signals, and the other end of each serial-to-parallel conversion chip is connected to two intermediate frequency receiving channels for the transmission of control signals.

[0020] According to the above technical solution, the first switch, the second switch, the third switch and the fourth switch are all single-pole double-throw switches.

[0021] According to the above technical solution, the first and second filters in the bandwidth selection unit are broadband filters, and the third filter in the amplification and filtering unit is a low-pass filter.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] In this invention, the control unit receives external control signals, allowing for real-time adjustment of the gain and bandwidth of the two intermediate frequency (IF) receiving channels to adapt to different signal strengths and frequency requirements, thus providing better reception performance. The design of each module (such as the attenuation amplification unit, bandwidth selection unit, and amplification filtering unit) optimizes the processing of different types of IF signals, improving signal quality and anti-interference capabilities. The bandwidth selection unit effectively filters out unnecessary frequency components, enhancing the system's sensitivity and frequency selectivity, and improving the reception of the target signal. Attached Figure Description

[0024] Figure 1 This is a block diagram illustrating the principle of the dual-channel intermediate frequency receiving module of this utility model.

[0025] Figure 2 This is the circuit diagram of the dual-channel intermediate frequency receiving module of this utility model;

[0026] Figure 3 This is a schematic diagram of the dual-channel intermediate frequency receiving module of this utility model.

[0027] The diagram shows the following markings: 100 - Mode selection unit, 101 - First switch, 102 - First amplifier, 103 - Second switch, 200 - Attenuation amplification unit, 201 - First digitally controlled attenuator, 202 - Second amplifier, 203 - Second digitally controlled attenuator, 300 - Bandwidth selection unit, 301 - Third switch, 302 - Fourth switch, 303 - First filter, 304 - Second filter, 400 - Amplification and filtering unit, 401 - Third amplifier, 402 - Third filter, 500 - Control unit, 501 - Serial-to-parallel conversion chip. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] Example 1

[0030] like Figure 1 and Figure 3 As shown, a dual-channel intermediate frequency (IF) receiver module includes a control unit 500, which is connected to two IF receiver channels respectively. The control unit 500 is used to receive external control signals, provide control codes for the two IF receiver channels, and then switch the channel gain and bandwidth selection.

[0031] The intermediate frequency receiving channel includes a mode selection unit 100, an attenuation amplification unit 200, a bandwidth selection unit 300, and an amplification and filtering unit 400; wherein, one end of the mode selection unit 100 is connected to the control unit 500, and the other end of the mode selection unit 100 is connected to the attenuation amplification unit 200, and the attenuation amplification unit 200, the bandwidth selection unit 300, and the amplification and filtering unit 400 are connected in sequence.

[0032] The intermediate frequency signal is output after being processed by the amplification and filtering unit 400.

[0033] In this invention, the control unit 500 receives external control signals, allowing for real-time adjustment of the gain and bandwidth of the two intermediate frequency (IF) receiving channels to adapt to different signal strengths and frequency requirements, thus providing better reception performance. The design of each module (such as the attenuation amplification unit 200, bandwidth selection unit 300, and amplification and filtering unit 400) enables optimized processing of different types of IF signals, improving signal quality and anti-interference capabilities. The bandwidth selection unit 300 effectively filters out unnecessary frequency components, improving system sensitivity and frequency selectivity, and enhancing the reception of the target signal.

[0034] Example 2

[0035] This embodiment is a further refinement of Embodiment 1.

[0036] like Figure 2 As shown, the mode selection unit 100 includes a first switch 101, a first amplifier 102, and a second switch 103; wherein, pin 1 of the first switch 101 is used for intermediate frequency input, pin 2 of the first switch 101 is connected to one end of the first amplifier 102, and the other end of the first amplifier 102 is connected to pin 1 of the second switch 103.

[0037] Pin 3 of the first switch 101 is connected to pin 2 of the second switch 103, and pin 3 of the second switch 103 is connected to the attenuation and amplification unit 200.

[0038] The attenuation and amplification unit 200 includes a first digitally controlled attenuator 201, a second amplifier 202, and a second digitally controlled attenuator 203;

[0039] One end of the first numerically controlled attenuator 201 is connected to pin 3 of the second switch 103 of the mode selection unit 100; the other end of the first numerically controlled attenuator 201 is connected to one end of the second amplifier 202, the other end of the second amplifier 202 is connected to one end of the second numerically controlled attenuator 203, and the other end of the second numerically controlled attenuator 203 is connected to the bandwidth selection unit 300.

[0040] The bandwidth selection unit 300 includes a third switch 301, a fourth switch 302, a first filter 303, and a second filter 304;

[0041] Pin 1 of the third switch 301 is connected to the second digitally controlled attenuator 203 of the attenuation amplification unit 200; pin 2 of the third switch 301 is connected to one end of the first filter 303, the other end of the first filter 303 is connected to pin 1 of the fourth switch 302, pin 3 of the third switch 301 is connected to one end of the second filter 304, and the other end of the second filter 304 is connected to pin 2 of the fourth switch 302.

[0042] Pin 3 of the fourth switch 302 is connected to the amplification and filtering unit 400.

[0043] The amplification and filtering unit 400 includes a third amplifier 401 and a third filter 402; wherein, one end of the third amplifier 401 is connected to the fourth switch 302 of the bandwidth selection unit 300;

[0044] The other end of the third amplifier 401 is connected to one end of the third filter 402, and the other end of the third filter 402 is used for outputting the output signal.

[0045] The control unit 500 includes two serial-to-parallel conversion chips 501. One end of each serial-to-parallel conversion chip 501 is used to receive the input of control signals, and the other end of each serial-to-parallel conversion chip 501 is connected to two intermediate frequency receiving channels for the transmission of control signals.

[0046] The first switch 101, the second switch 103, the third switch 301, and the fourth switch 302 are all single-pole double-throw switches.

[0047] The first filter 303 and the second filter 304 in the bandwidth selection unit 300 are broadband filters, and the third filter 402 in the amplification and filtering unit 400 is a low-pass filter.

[0048] The working principle of this utility model is as follows: the input intermediate frequency signal is amplified and attenuated by the mode selection unit 100, and then the gain is adjusted and dynamically adjusted. Then, the bandwidth selection unit 300 switches between 25MHz bandwidth and 25kHz bandwidth, and finally outputs the signal after amplification and filtering.

[0049] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0050] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A dual-channel intermediate frequency receiver module, characterized in that: It includes a control unit (500), which is connected to two intermediate frequency receiving channels respectively. The control unit (500) is used to receive external control signals, provide control codes for the two intermediate frequency receiving channels, and then switch the channel gain and bandwidth selection. The intermediate frequency receiving channel includes a mode selection unit (100), an attenuation amplification unit (200), a bandwidth selection unit (300), and an amplification and filtering unit (400); wherein, one end of the mode selection unit (100) is connected to the control unit (500), and the other end of the mode selection unit (100) is connected to the attenuation amplification unit (200), and the attenuation amplification unit (200), the bandwidth selection unit (300), and the amplification and filtering unit (400) are connected in sequence; The intermediate frequency signal is output after being processed by the amplification and filtering unit (400).

2. The dual-channel intermediate frequency receiving module according to claim 1, characterized in that: The mode selection unit (100) includes a first switch (101), a first amplifier (102), and a second switch (103); wherein, pin 1 of the first switch (101) is used for intermediate frequency input, pin 2 of the first switch (101) is connected to one end of the first amplifier (102), and the other end of the first amplifier (102) is connected to pin 1 of the second switch (103); Pin 3 of the first switch (101) is connected to pin 2 of the second switch (103), and pin 3 of the second switch (103) is connected to the attenuation amplification unit (200).

3. A dual-channel intermediate frequency receiving module according to claim 2, characterized in that: The attenuation and amplification unit (200) includes a first digitally controlled attenuator (201), a second amplifier (202), and a second digitally controlled attenuator (203); One end of the first numerically controlled attenuator (201) is connected to pin 3 of the second switch (103) of the mode selection unit (100); the other end of the first numerically controlled attenuator (201) is connected to one end of the second amplifier (202), the other end of the second amplifier (202) is connected to one end of the second numerically controlled attenuator (203), and the other end of the second numerically controlled attenuator (203) is connected to the bandwidth selection unit (300).

4. A dual-channel intermediate frequency receiving module according to claim 3, characterized in that: The bandwidth selection unit (300) includes a third switch (301), a fourth switch (302), a first filter (303), and a second filter (304); Pin 1 of the third switch (301) is connected to the second digitally controlled attenuator (203) of the attenuation amplification unit (200); pin 2 of the third switch (301) is connected to one end of the first filter (303), the other end of the first filter (303) is connected to pin 1 of the fourth switch (302), pin 3 of the third switch (301) is connected to one end of the second filter (304), and the other end of the second filter (304) is connected to pin 2 of the fourth switch (302); Pin 3 of the fourth switch (302) is connected to the amplification and filtering unit (400).

5. A dual-channel intermediate frequency receiving module according to claim 4, characterized in that: The amplification and filtering unit (400) includes a third amplifier (401) and a third filter (402); wherein one end of the third amplifier (401) is connected to the fourth switch (302) of the bandwidth selection unit (300); The other end of the third amplifier (401) is connected to one end of the third filter (402), and the other end of the third filter (402) is used for the output signal.

6. A dual-channel intermediate frequency receiving module according to claim 5, characterized in that: The control unit (500) includes two serial-to-parallel conversion chips (501), one end of each serial-to-parallel conversion chip (501) is used to receive the input of control signals, and the other end of each serial-to-parallel conversion chip (501) is connected to two intermediate frequency receiving channels for the transmission of control signals.

7. A dual-channel intermediate frequency receiving module according to claim 6, characterized in that: The first switch (101), the second switch (103), the third switch (301), and the fourth switch (302) are all single-pole double-throw switches.

8. A dual-channel intermediate frequency receiving module according to claim 7, characterized in that: The first filter (303) and the second filter (304) in the bandwidth selection unit (300) are broadband filters, and the third filter (402) in the amplification and filtering unit (400) is a low-pass filter.

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