Multi-channel broadband receiving circuit

Abstract

The utility model discloses a multi-channel broadband receiving circuit, which comprises a multi-channel receiving module and a local oscillator and calibration source module, the multi-path receiving module is connected with the local oscillator and calibration source module, and is used for receiving a broadband signal from an external antenna and a calibration signal transmitted by the local oscillator and calibration source module; and the multipath receiving module processes the received signal. According to the utility model, the plurality of receiving modules are arranged, so that the circuit can process broadband signals from different signal sources at the same time, has a multi-signal receiving capability, and meets the requirement of multi-channel processing; and through a reasonably configured amplification structure, good signal gain performance in different frequency ranges can be ensured.

Description

Technical Field

[0001] This utility model belongs to the field of communication direction finding technology, specifically a multi-channel broadband receiving circuit. Background Technology

[0002] In the current field of military and civilian communication direction finding, various application scenarios have placed demands on direction finding equipment for high dynamic range, high bandwidth, high sensitivity, and small size, with a receiving range covering the entire spectrum from 0.3GHz to 18GHz. Therefore, miniaturization, reducing design and system complexity, and improving channel consistency and product reliability are particularly important.

[0003] In the prior art, for example, the technical solution described in patent publication number CN216531293U: a multi-channel RF front-end, including a receiving antenna and a transmitting antenna. An RF switch is used to connect the receiving and transmitting antennas, and to switch between different signal paths with the multi-channel RF receiving and transmitting components. A MIMO antenna using gallium nitride (GaN) technology is used to improve the operating bandwidth.

[0004] In existing technologies, although RF switches can simplify certain control structures, the overall system design still requires consideration of coordination and management between multi-channel components, increasing system complexity. Integrating multiple components can lead to increased system size, especially in small devices or portable devices, which may not be suitable for specific application requirements.

[0005] This utility model provides a multi-channel broadband receiving module. Utility Model Content

[0006] The purpose of this invention is to provide a multi-channel broadband receiving circuit to solve the problem in the prior art mentioned in the background that the RF front-end has high system complexity and the system size increases due to the integration of multiple components.

[0007] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0008] A multi-channel broadband receiving circuit includes a multi-channel receiving module and a local oscillator and calibration source module; wherein, the multi-channel receiving module is connected to the local oscillator and calibration source module, and the multi-channel receiving module is used to receive broadband signals from an external antenna and calibration signals transmitted by the local oscillator and calibration source module; the multi-channel receiving module processes the received signals;

[0009] The multi-channel receiver module includes a first switch, a limiter, a first amplifier, a second switch, a first attenuator, a first switch filter group, a second amplifier, a first mixer, a second filter, a fourth amplifier, a third filter, a second mixer, a second attenuator, a fifth filter, a sixth amplifier, a third attenuator, a fourth attenuator, a seventh amplifier, and a sixth filter;

[0010] One end of the first switch is used for radio frequency signal input, and the other end of the first switch is connected to the limiter and one end of the second switch respectively; the other end of the limiter is connected to one end of the first amplifier, and the other end of the first amplifier is connected to one end of the second switch.

[0011] The other end of the second switch is connected in sequence to the first attenuator, the first switch filter group, the second amplifier, the first mixer, the second filter, the fourth amplifier, the third filter, the second mixer, the second attenuator, the fifth filter, the sixth amplifier, the third attenuator, the fourth attenuator, the seventh amplifier, and the sixth filter; the sixth filter (123) is also used for intermediate frequency signal output;

[0012] The first mixer is also connected to the first connection circuit; the second mixer is also connected to the second connection circuit.

[0013] According to the above technical solution, the first connection circuit includes a first filter and a third amplifier; wherein, one end of the first filter is connected to the first mixer, the other end of the first filter is connected to one end of the third amplifier, and the other end of the third amplifier is used for signal input.

[0014] According to the above technical solution, the second connection circuit includes a fourth filter and a fifth amplifier; one end of the fourth filter is connected to the second mixer; the other end of the fourth filter is connected to one end of the fifth amplifier, and the other end of the fifth amplifier is used for signal input.

[0015] According to the above technical solution, the local oscillator and calibration source module includes a crystal oscillator, a clock power divider, a phase-locked loop, an eighth amplifier, a second switching filter group, a ninth amplifier, and a local oscillator power divider; wherein, the crystal oscillator, clock power divider, phase-locked loop, eighth amplifier, second switching filter group, ninth amplifier, and local oscillator power divider are connected in sequence.

[0016] According to the above technical solution, the multi-channel receiving module receives broadband signals from external antennas ranging from 0.3 GHz to 18 GHz.

[0017] According to the above technical solution, the first switching filter group adopts a single-stage switching filter group to suppress the half-frequency and second harmonic of the radio frequency.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] In this invention, by incorporating multiple receiving modules, the circuit can simultaneously process broadband signals from different signal sources, possessing multi-signal reception capabilities and meeting the needs of multi-channel processing. The circuit includes modules such as limiters and amplifiers, which help improve signal quality, reduce noise, and enhance signal availability. Through a rationally configured amplification structure, it also ensures good signal gain performance across different frequency ranges. The introduction of local oscillator and calibration source modules allows for the calibration of the received signal, improving the overall system accuracy. It can compensate for the influence of external environmental factors on the signal, ensuring the accuracy and stability of the received signal. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the receiving circuit of this utility model;

[0021] Figure 2 This is a circuit diagram of the multi-channel receiver module of this utility model;

[0022] Figure 3 This is the circuit diagram of the local oscillator and calibration source module of this utility model.

[0023] The diagram is labeled as follows: 100-First switch, 200-Limiter, 300-First amplifier, 400-Second switch, 500-First attenuator, 600-First switch filter group, 700-Second amplifier, 800-First mixer, 900-First filter, 110-Third amplifier, 111-Second filter, 112-Fourth amplifier, 113-Third filter, 114-Second mixer, 115-Fourth filter, 116-Fifth amplifier, 117-Second attenuator, 118-Fifth filter, 119-Sixth amplifier, 120-Third attenuator, 121-Fourth attenuator, 122-Seventh amplifier, 123-Sixth filter, 124-Crystal oscillator, 125-Clock power divider, 126-Phase-locked loop, 127-Eighth amplifier, 128-Second switch filter group, 129-Ninth amplifier, 130-Local oscillator power divider. Detailed Implementation

[0024] 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.

[0025] Example 1

[0026] like Figure 1As shown, a multi-channel broadband receiving circuit includes a multi-channel receiving module and a local oscillator and calibration source module; wherein, the multi-channel receiving module is connected to the local oscillator and calibration source module, and the multi-channel receiving module is used to receive broadband signals from an external antenna and calibration signals transmitted by the local oscillator and calibration source module; the multi-channel receiving module processes the received signals;

[0027] like Figure 2 As shown, the multi-channel receiver module includes a first switch 100, a limiter 200, a first amplifier 300, a second switch 400, a first attenuator 500, a first switch filter group 600, a second amplifier 700, a first mixer 800, a second filter 111, a fourth amplifier 112, a third filter 113, a second mixer 114, a second attenuator 117, a fifth filter 118, a sixth amplifier 119, a third attenuator 120, a fourth attenuator 121, a seventh amplifier 122, and a sixth filter 123.

[0028] One end of the first switch 100 is used for signal input, and the other end of the first switch 100 is connected to one end of the limiter 200 and the second switch 400 respectively; the other end of the limiter 200 is connected to one end of the first amplifier 300, and the other end of the first amplifier 300 is connected to one end of the second switch 400.

[0029] The other end of the second switch 400 is sequentially connected to the first attenuator 500, the first switch filter group 600, the second amplifier 700, the first mixer 800, the second filter 111, the fourth amplifier 112, the third filter 113, the second mixer 114, the second attenuator 117, the fifth filter 118, the sixth amplifier 119, the third attenuator 120, the fourth attenuator 121, the seventh amplifier 122, and the sixth filter 123; the sixth filter 123 is also used for signal input;

[0030] The first mixer 800 is also connected to the first connection circuit; the second mixer 114 is also connected to the second connection circuit.

[0031] In this invention, by incorporating multiple receiving modules, the circuit can simultaneously process broadband signals from different signal sources, possessing multi-signal reception capabilities and meeting the needs of multi-channel processing. The circuit includes modules such as a limiter 200 and an amplifier, which help improve signal quality, reduce noise, and enhance signal availability. Through a rationally configured amplification structure, it also ensures good signal gain performance across different frequency ranges. The introduction of a local oscillator and calibration source modules allows for the calibration of the received signal, improving the overall system accuracy. It can compensate for the influence of external environmental factors on the signal, ensuring the accuracy and stability of the received signal.

[0032] By setting up multi-stage filters, interference signals can be effectively removed, leaving only the signal in the desired frequency band. Different filters can be selected for specific frequencies, effectively improving signal quality.

[0033] By using a combination of multiple switches, the input and processing paths of signals can be flexibly selected. This design allows the circuit to adjust the signal processing flow according to specific application requirements, improving overall flexibility and functionality.

[0034] Example 2

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

[0036] The first connection circuit includes a first filter 900 and a third amplifier 110; wherein, one end of the first filter 900 is connected to the first mixer 800, and the other end of the first filter 900 is connected to one end of the third amplifier 110, and the other end of the third amplifier 110 is used for signal input.

[0037] The second connection circuit includes a fourth filter 115 and a fifth amplifier 116; one end of the fourth filter 115 is connected to the second mixer 114; the other end of the fourth filter 115 is connected to one end of the fifth amplifier, and the other end of the fifth amplifier 116 is used for signal input.

[0038] like Figure 3 As shown, the local oscillator and calibration source module includes a crystal oscillator 124, a clock power divider 125, a phase-locked loop 126, an eighth amplifier 127, a second switching filter group 128, a ninth amplifier 129, and a local oscillator power divider 130; wherein, the crystal oscillator 124, the clock power divider 125, the phase-locked loop 126, the eighth amplifier 127, the second switching filter group 128, the ninth amplifier 129, and the local oscillator power divider 130 are connected in sequence.

[0039] Furthermore, the local oscillator power divider 130 uses existing devices, such as an 18-40G power divider.

[0040] The multiplexer module receives broadband signals from an external antenna ranging from 0.3 GHz to 18 GHz.

[0041] The first switching filter group 600 is a single-stage switching filter group used to suppress the half-frequency and second harmonic of radio frequency.

[0042] The working principle of this invention is as follows: by performing two superheterodyne downconversions, the broadband radio frequency signal is converted to a fixed-frequency intermediate frequency signal, which is then used by the subsequent signal processing card for signal processing.

[0043] In this embodiment, the multi-channel receiving module receives a broadband signal from an external antenna ranging from 0.3 GHz to 18 GHz, performs two frequency conversions to 1.8 GHz, and outputs it to the signal processing card. The two-conversion method effectively suppresses image and second-order interference, achieving good frequency selectivity and dynamic range. The RF front-end uses a single-stage switching filter bank to suppress f / 2 and 2f of the RF signal, ensuring second-order suppression. The RF range of 0.8 GHz to 7 GHz uses a high-frequency (IF) approach; to ensure half-IF suppression of the first IF, a 21.6 GHz IF is selected. The RF range of 7 GHz to 18 GHz uses a low-frequency (IF) approach; to ensure IF suppression of the first IF, a 5 GHz IF is selected. After RF segmentation, the two frequency bands are mixed with a local oscillator (LO). The 21.6 GHz and 5 GHz IF signals are filtered and amplified, then mixed with two LOs via a two-to-one switch, resulting in LO frequencies of 19.8 GHz and 6.8 GHz, ultimately outputting an 1.8 GHz IF signal.

[0044] In this embodiment, the eight independent receiving modules take the following measures during the design process to achieve amplitude and phase consistency between channels: each receiving module adopts the exact same design to achieve good amplitude and phase consistency.

[0045] 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.

[0046] 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 multi-channel wideband receive circuit, characterized by: The multi-path receiving module and the local oscillator and calibration source module are connected, the multi-path receiving module is used for receiving wideband signals from an external antenna and calibration signals transmitted by the local oscillator and calibration source module; the multi-path receiving module processes the received signals; The multi-path receiving module comprises a first switch (100), a limiter (200), a first amplifier (300), a second switch (400), a first attenuator (500), a first switch filter group (600), a second amplifier (700), a first mixer (800), a second filter (111), a fourth amplifier (112), a third filter (113), a second mixer (114), a second attenuator (117), a fifth filter (118), a sixth amplifier (119), a third attenuator (120), a fourth attenuator (121), a seventh amplifier (122), and a sixth filter (123). One end of the first switch (100) is used for inputting a radio frequency signal, and the other end of the first switch (100) is connected with the limiter (200) and one end of the second switch (400) respectively; the other end of the limiter (200) is connected with one end of the first amplifier (300), and the other end of the first amplifier (300) is connected with one end of the second switch (400); The other end of the second switch (400) is connected with the first attenuator (500), the first switch filter group (600), the second amplifier (700), the first mixer (800), the second filter (111), the fourth amplifier (112), the third filter (113), the second mixer (114), the second attenuator (117), the fifth filter (118), the sixth amplifier (119), the third attenuator (120), the fourth attenuator (121), the seventh amplifier (122), and the sixth filter (123) in sequence; the sixth filter (123) is also used for outputting an intermediate frequency signal. The first mixer (800) is also connected with a first connection circuit; the second mixer (114) is also connected with a second connection circuit, and the first connection circuit and the second connection circuit are connected with the local oscillator and calibration source module.

2. A multi-channel wideband receive circuit according to claim 1, characterized in that: The first connection circuit comprises a first filter (900) and a third amplifier (110); one end of the first filter (900) is connected with the first mixer (800), the other end of the first filter (900) is connected with one end of the third amplifier (110), and the other end of the third amplifier (110) is used for inputting a signal.

3. A multi-channel wideband receive circuit according to claim 2, characterized in that: The second connection circuit comprises a fourth filter (115) and a fifth amplifier (116); one end of the fourth filter (115) is connected with the second mixer (114); the other end of the fourth filter (115) is connected with one end of the fifth amplifier (116), and the other end of the fifth amplifier (116) is used for inputting a signal.

4. A multi-channel wideband receive circuit according to claim 3, characterized in that: The local oscillator and calibration source module comprises a crystal oscillator (124), a clock power divider (125), a phase-locked loop (126), an eighth amplifier (127), a second switch filter group (128), a ninth amplifier (129) and a local oscillator power divider (130); wherein the crystal oscillator (124), the clock power divider (125), the phase-locked loop (126), the eighth amplifier (127), the second switch filter group (128), the ninth amplifier (129) and the local oscillator power divider (130) are connected in sequence, and the local oscillator power divider (130) is connected with the first connection circuit and the second connection circuit respectively.

5. A multi-channel wideband receive circuit according to claim 4, characterized in that: The multi-path receiving module receives a wideband signal of 0.3GHz-18GHz from an external antenna.

6. A multi-channel wideband receive circuit according to claim 5, characterized in that: The first switch filter group (600) adopts a first-stage switch filter group and is used for suppressing a half frequency and a double frequency of radio frequency.

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