An upconverter

Abstract

The present application discloses an up-converter, comprising: a cavity, a first RF connector and a second RF connector are arranged on a first side of the cavity, a third RF connector and a fourth RF connector are arranged on a second side of the cavity, a first circuit board is arranged in the cavity, an up-conversion circuit is arranged on the first circuit board, and the up-conversion circuit comprises a pre-processing module, a first mixing module, a first filtering module, a second filtering module, a second mixing module and a third filtering module. The present application can improve the signal-to-noise ratio and frequency purity of the up-conversion signal finally outputted.

Description

Technical Field

[0001] The present application belongs to the technical field of frequency converters, and specifically relates to an up-converter. Background Art

[0002] Traditionally, frequency converters tend to generate more spurious signals and by-products during the frequency conversion process, especially in the mixing stage. Due to non-ideal mixing characteristics, the incomplete linear multiplication of the input signal and the local oscillation signal will generate sideband products other than the desired frequency, such as image frequency and nonlinear spurious signals. If these undesired signals cannot be effectively filtered out, they will contaminate the output signal, reduce its purity, and affect the demodulation and data recovery quality at the receiving end. Utility Model Content

[0003] The main purpose of the present application is to provide an up-converter, and the present application aims to solve the problem of purity of the up-converted signal output by the existing up-converter.

[0004] To achieve the above objectives, this application provides the following technical solutions:

[0005] An up-converter, the up-converter comprising: a cavity, a first RF connector and a second RF connector are arranged on a first side of the cavity, a third RF connector and a fourth RF connector are arranged on a second side of the cavity, a first circuit board is arranged in the cavity, an up-conversion circuit is arranged on the first circuit board, the up-conversion circuit comprises a pre-processing module, a first frequency mixing module, a first filtering module, a second filtering module, a second frequency mixing module, and a third filtering module, wherein an input end of the pre-processing module is connected to the first RF connector, and an output end of the pre-processing module is connected to a first input end of the first frequency mixing module; a second input end of the first frequency mixing module is connected to the second RF connector, and an output end of the first frequency mixing module is connected to an input end of the first filtering module; an output end of the first filtering module is connected to an input end of the second filtering module, and an output end of the second filtering module is connected to a first input end of the second frequency mixing module;

[0006] The second input end of the second frequency mixing module is connected to the third RF connector, the output end of the second frequency mixing module is connected to the input end of the third filtering module; and the output end of the third filtering module is connected to the fourth RF connector.

[0007] Optionally, the preprocessing module includes: a first attenuator, an input end of the first attenuator is connected to the first RF connector, and an output end of the first attenuator is connected to the first mixing module.

[0008] Optionally, the first mixing module includes: a first mixer, a first input end of the first mixer is connected to the output end of the first attenuator, and a second input end of the first mixer is connected to the second RF connector.

[0009] Optionally, the first filtering module includes: a low-pass filter and a second attenuator, wherein the input end of the low-pass filter is connected to the output end of the first mixer, the output end of the low-pass filter is connected to the input end of the second attenuator, and the output end of the second attenuator is connected to the input end of the second filtering module.

[0010] Optionally, the second filtering module includes: a first amplifier and a bandpass filter, wherein the input end of the first amplifier is connected to the output end of the second attenuator, the output end of the first amplifier is connected to the input end of the bandpass filter, and the output end of the bandpass filter is connected to the first input end of the second mixing module.

[0011] Optionally, the second mixing module includes: a second mixer, a first input end of the second mixer connected to the output end of the bandpass filter, a second input end of the second mixer connected to the third RF connector, and an output end of the second mixer connected to the input end of the third filtering module.

[0012] Optionally, the third filtering module includes: a high-frequency bandpass filter and a second amplifier,

[0013] The input end of the high-frequency bandpass filter is connected to the output end of the second mixer, the output end of the high-frequency bandpass filter is connected to the input end of the second amplifier, and the output end of the second amplifier is connected to the fourth RF connector.

[0014] Optionally, a second circuit board is further provided in the cavity, a power supply module is provided on the second circuit board, an input end of the power supply module is connected to a low-frequency connector provided on the first side of the cavity, and an output end is connected to the first circuit board.

[0015] Optionally, a first cover plate is provided on the upper end surface of the cavity.

[0016] Optionally, a second cover plate is provided on the lower end surface of the cavity.

[0017] Compared with the prior art, the beneficial effects brought by the present application are as follows: in order to solve the problem that the existing up-converter is prone to generate more stray signals and by-products during the frequency conversion process, thereby resulting in insufficient purity of the output up-converted signal, the present application sets a multi-stage filter to filter out the stray frequencies in the first frequency conversion signal and the second frequency conversion signal step by step, thereby improving the signal-to-noise ratio and frequency purity of the final output up-converted signal. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a front view of an up-converter provided by an embodiment of the present application;

[0019] Figure 2 is a rear view of an up-converter provided by another embodiment of the present application;

[0020] Figure 3 is an exploded diagram of an up-converter provided by another embodiment of the present application;

[0021] Figure 4 It is a circuit block diagram of an up-conversion circuit provided in another embodiment of the application.

[0022] Figure 5 It is a schematic diagram of the layout structure of an up-conversion circuit on a first circuit board provided in another embodiment of the application.

[0023] The following are the descriptions of the reference numerals:

[0024] 1-1, cavity; 1-2, first circuit board; 1-3, second circuit board; 1-4, first cover plate; 1-5, second cover plate; 1-6, first RF connector; 1-7, second RF connector; 1-8, third RF connector; 1-9, fourth RF connector; 1-10, low-frequency connector; 10, pre-processing module; 11, first attenuator; 20, first mixing module; 21, first mixer; 30, first filtering module; 31, low-pass filter; 32, second attenuator; 40, second filtering module; 41, first amplifier; 42, band-pass filter; 50, second mixing module; 51, second mixer; 60, third filtering module; 61, high-frequency band-pass filter; 62, second amplifier. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0027] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0029] Figure 1 is a front view of an up-converter according to an embodiment of the present application; Figure 2 A rear view of an up-converter according to an embodiment of the present application; Figure 3 An exploded diagram of an up-converter according to an implementation mode of the present application; Figure 1 , Figure 2 and Figure 3 As shown, the up converter comprises:

[0030] A cavity 1-1, a first side of the cavity 1-1 is provided with a first RF connector 1-6 and a second RF connector 1-7, a second side of the cavity 1-1 is provided with a third RF connector 1-8 and a fourth RF connector 1-9,

[0031] A first circuit board 1-2 is disposed in the cavity 1-1.

[0032] like Figure 4 As shown, the first circuit board 1-2 is provided with an up-conversion circuit, and further reference is made to Figure 5 The up-conversion circuit may include a pre-processing module 10, a first mixing module 20, a first filtering module 30, a second filtering module 40, a second mixing module 50, and a third filtering module 60, wherein:

[0033] The input end of the preprocessing module 10 is connected to the first RF connector 1-6, and the output end of the preprocessing module 10 is connected to the first input end of the first mixing module 20;

[0034] The second input end of the first frequency mixing module 20 is connected to the second RF connector 1 - 7 , and the output end of the first frequency mixing module 20 is connected to the input end of the first filtering module 30 ;

[0035] The output end of the first filtering module 30 is connected to the input end of the second filtering module 40, and the output end of the second filtering module 40 is connected to the first input end of the second mixing module 50;

[0036] The second input end of the second frequency mixing module 50 is connected to the third RF connector 1-8, and the output end of the second frequency mixing module 50 is connected to the input end of the third filtering module 60;

[0037] The output end of the third filtering module 60 is connected to the fourth RF connector 1 - 9 .

[0038] This embodiment provides a multi-stage filtering module to filter out spurious frequencies in the mixing signals output by the first mixing module and the second mixing module step by step, thereby improving the signal-to-noise ratio and frequency purity of the up-converted signal finally output.

[0039] In another exemplary embodiment, the pre-processing module 10 comprises:

[0040] The first attenuator 11,

[0041] An input end of the first attenuator 11 is connected to the first RF connector 1 - 6 , and an output end of the first attenuator 11 is connected to the first mixing module 20 .

[0042] In this embodiment, the first RF connector 1-6 is used to receive an input signal. For example, the input signal may be a 70 MHz intermediate frequency signal. When the intermediate frequency signal enters the first attenuator 11 through the first RF connector 1-6, the first attenuator 11 can absorb the energy of the intermediate frequency signal without changing the original frequency characteristics of the intermediate frequency signal to reduce the amplitude or power of the intermediate frequency signal.

[0043] Exemplarily, the first attenuator 11 can be an adjustable attenuator or a fixed attenuator. If an adjustable attenuator is used, the attenuator will automatically adjust the resistance value, capacitance value or inductance value of its internal circuit based on the control signal, thereby changing the attenuation of the intermediate frequency signal when it passes through. If a fixed attenuator is used, that is, the attenuation of the attenuator is preset and unchanged, it will constantly attenuate the intermediate frequency signal according to the attenuation value set during manufacturing.

[0044] It should be noted that the mixer or amplifier part placed at the back end of the up-conversion circuit usually has specific restrictions on the level of the input signal. An excessively strong input signal may cause nonlinear distortion, thereby affecting the frequency conversion efficiency and the purity of the output signal. Therefore, it is necessary to set a first attenuator 11 to appropriately reduce the level of the input signal to ensure that the converter operates in a safe and linear area to avoid saturation.

[0045] In another exemplary embodiment, the first frequency mixing module 20 includes:

[0046] The first mixer 21,

[0047] A first input end of the first mixer 21 is connected to an output end of the first attenuator 11 , and a second input end of the first mixer 21 is connected to the second RF connector 1 - 7 .

[0048] In this embodiment, the intermediate frequency signal attenuated by the first attenuator 11 enters the first mixer 21 through the first input end of the first mixer 21. At the same time, the local oscillation signal generated by the local oscillator enters the second input end of the first mixer 21 through the second RF connector 1-7. For example, if the input local oscillation signal is 650MHz, a first mixed signal of 720MHz can be obtained after mixing with the attenuated intermediate frequency signal of 70MHz.

[0049] In another exemplary embodiment, the first filtering module 30 includes:

[0050] The low pass filter 31 and the second attenuator 32,

[0051] in,

[0052] The input end of the low-pass filter 31 is connected to the output end of the first mixer 21 , the output end of the low-pass filter 31 is connected to the input end of the second attenuator 32 , and the output end of the second attenuator 32 is connected to the input end of the second filtering module 40 .

[0053] In this embodiment, in the process of mixing the intermediate frequency signal and the local oscillation signal by the first mixer 21, the intermediate frequency signal of 70MHz and the local oscillation signal of 650MHz as mentioned above will generate multiple frequency components after mixing, including the required first mixing signal (IF signal), but also unnecessary frequency components such as image signals, stray signals and other high-frequency components. If these unnecessary high-frequency components are not removed, first, they will overlap with the first mixing signal, resulting in a decrease in the signal-to-noise ratio of the first mixing signal, thereby affecting the reception quality and demodulation accuracy of the first mixing signal; second, they may cause the amplifier to operate in a nonlinear region, thereby generating more harmonics and intermodulation products, thereby deteriorating the signal quality. Therefore, in this embodiment, by connecting a low-pass filter 31 after the first mixer 21, the high-frequency components can be filtered out.

[0054] It is worth noting that despite the filtering process of the low-pass filter 31, the first mixed signal may still have strong high-frequency components or sudden large signal peaks, which may damage the subsequent circuits. Therefore, the present embodiment further adds a second attenuator 32 after the low-pass filter 31. The second attenuator 32 serves as a protection mechanism to attenuate these high-frequency components to prevent these high-frequency components from overloading or damaging the subsequent circuits. In addition, the residual high-frequency components usually contain noise. By setting the second attenuator 32, the noise level can be reduced, thereby improving the purity and signal-to-noise ratio of the first mixed signal.

[0055] In another exemplary embodiment, the second filtering module 40 includes:

[0056] The first amplifier 41 and the bandpass filter 42,

[0057] in,

[0058] The input end of the first amplifier 41 is connected to the output end of the second attenuator 32 , the output end of the first amplifier 41 is connected to the input end of the bandpass filter 42 , and the output end of the bandpass filter 42 is connected to the first input end of the second mixing module 50 .

[0059] In this embodiment, after being processed by the first filter module 30 , the first mixed signal is purified to a relatively moderate degree. At this time, the first amplifier 41 is connected to amplify the first mixed signal more efficiently.

[0060] Although a relatively pure first mixing signal is obtained after the aforementioned circuit processing, a small amount of noise signals and other unnecessary signal frequencies are still inevitably present in the first mixing signal, and since the first amplifier 41 usually amplifies all the signals passing through in equal proportion, in order to further eliminate the amplified noise and other signals, the present embodiment connects a bandpass filter 42 after the first amplifier 41, and the frequency components in the first mixing signal can be further screened out through the bandpass filter 42. The bandpass filter 42 only allows signals in a specific frequency range (i.e., passband) to pass through, while attenuating signals below the lower cutoff frequency and above the upper cutoff frequency (i.e., stopband signals), so that the amplified noise and unnecessary frequency interference can be effectively removed, ensuring that only the frequency band of the first mixing signal is retained, thereby further improving the purity of the first mixing signal.

[0061] In another exemplary embodiment, the second mixing module 50 includes:

[0062] The second mixer 51,

[0063] The first input end of the second mixer 51 is connected to the output end of the bandpass filter 42 , the second input end of the second mixer 51 is connected to the third RF connector 1 - 8 , and the output end of the second mixer 51 is connected to the input end of the third filtering module 60 .

[0064] In this embodiment, the second mixer 51 mixes the 720 MHz signal output after bandpass filtering by the bandpass filter 42 with a frequency synthesis signal (for example, the frequency of the frequency synthesis signal is 7680 MHz to 7780 MHz) generated by the frequency synthesizer and input through the third RF connector 1-8 to generate a second mixing signal of 8400 MHz to 8500 MHz.

[0065] Furthermore, since the second mixer 51 is prone to generate spurious effects in the process of generating the second mixing signal, especially when the input signal and the local oscillation signal contain harmonics or nonlinear distortion, the spurious effects are more obvious. Therefore, it is necessary to set a bandpass filter 42 after the second mixer 51 to filter out such spurious signals to ensure the purity of the second mixing signal.

[0066] In another exemplary embodiment, the third filtering module 60 includes:

[0067] The high frequency band pass filter 61 and the second amplifier 62,

[0068] in,

[0069] The input end of the high-frequency bandpass filter 61 is connected to the output end of the second mixer 51 , the output end of the high-frequency bandpass filter 61 is connected to the input end of the second amplifier 62 , and the output end of the second amplifier 62 is connected to the fourth RF connector 1 - 9 .

[0070] Specifically, in order to further improve the quality of the second mixing signal and ensure the purity of the second mixing signal in the final stage of the signal processing chain, this embodiment introduces a high-frequency bandpass filter 61 after the second mixer 51. The high-frequency bandpass filter 61 can selectively allow signals within a specific frequency range to pass through, while attenuating or rejecting all signals below the lower cutoff frequency and above the upper cutoff frequency. The high-frequency bandpass filter 61 is set after the second mixer, which can retain only the required second mixing signal and filter out any possible remaining spurious signals, noise and mixing products, which helps to improve the signal-to-noise ratio of the second mixing signal and ensure the purity of the final output signal.

[0071] In addition, the second mixing signal generated by the second mixer 51 usually needs to be amplified again to ensure that the second mixing signal has a sufficient level to overcome the loss on the transmission path and meet the sensitivity requirements of the receiving end. Since the high-frequency bandpass filter 61 has removed most of the non-target signals and noise, the second amplifier 62 can focus more on enhancing the power of the second mixing signal without amplifying the noise at the same time. In addition, the second amplifier 62 can also play a role in impedance matching, ensuring that the second mixing signal can be effectively output from the fourth RF connector 1-9 to reduce reflection and energy transfer.

[0072] In summary, this embodiment, by setting the high-frequency bandpass filter 61, can implement precise frequency control in the final stage of the signal chain to ensure the high quality, high purity and compliance of the output signal, while optimizing the overall performance and efficiency of the system.

[0073] In another exemplary embodiment, a first cover plate 1 - 4 is provided on the upper end surface of the cavity 1 - 1 .

[0074] In another exemplary embodiment, a second cover plate 1-5 is provided on the lower end surface of the cavity 1-1.

[0075] In the above two embodiments, by setting the first cover plate 1-4 on the upper end surface of the cavity 1-1 and setting the second cover plate 1-5 on the lower end surface of the cavity 1-1, dust can be prevented and touching of the live components on the first circuit board can be prevented, thereby reducing the risk of electric shock.

[0076] The above are only preferred embodiments of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. An up-converter, characterized in that: The up-converter comprises: A cavity, a first side of the cavity is provided with a first RF connector and a second RF connector, a second side of the cavity is provided with a third RF connector and a fourth RF connector, A first circuit board is arranged in the cavity. The first circuit board is provided with an up-conversion circuit, and the up-conversion circuit includes a pre-processing module, a first mixing module, a first filtering module, a second filtering module, a second mixing module, and a third filtering module, wherein: The input end of the preprocessing module is connected to the first RF connector, and the output end of the preprocessing module is connected to the first input end of the first mixing module; The second input end of the first frequency mixing module is connected to the second RF connector, and the output end of the first frequency mixing module is connected to the input end of the first filtering module; The output end of the first filtering module is connected to the input end of the second filtering module, and the output end of the second filtering module is connected to the first input end of the second mixing module; The second input end of the second frequency mixing module is connected to the third RF connector, and the output end of the second frequency mixing module is connected to the input end of the third filtering module; The output end of the third filtering module is connected to the fourth RF connector.

2. The up-converter according to claim 1, characterized in that: The preprocessing module comprises: First attenuator, The input end of the first attenuator is connected to the first RF connector, and the output end of the first attenuator is connected to the first mixing module.

3. The up-converter according to claim 2, characterized in that: The first frequency mixing module comprises: The first mixer, The first input end of the first mixer is connected to the output end of the first attenuator, and the second input end of the first mixer is connected to the second RF connector.

4. The up-converter according to claim 3, characterized in that: The first filtering module comprises: Low pass filter and second attenuator, in, The input end of the low-pass filter is connected to the output end of the first mixer, the output end of the low-pass filter is connected to the input end of the second attenuator, and the output end of the second attenuator is connected to the input end of the second filtering module.

5. The up-converter according to claim 4, characterized in that: The second filtering module comprises: First amplifier and bandpass filter, in, The input end of the first amplifier is connected to the output end of the second attenuator, the output end of the first amplifier is connected to the input end of the bandpass filter, and the output end of the bandpass filter is connected to the first input end of the second mixing module.

6. The up-converter according to claim 5, characterized in that: The second mixing module comprises: The second mixer, The first input end of the second mixer is connected to the output end of the bandpass filter, the second input end of the second mixer is connected to the third RF connector, and the output end of the second mixer is connected to the input end of the third filtering module.

7. The up-converter according to claim 6, characterized in that: The third filtering module comprises: High frequency bandpass filter and second amplifier, in, The input end of the high-frequency bandpass filter is connected to the output end of the second mixer, the output end of the high-frequency bandpass filter is connected to the input end of the second amplifier, and the output end of the second amplifier is connected to the fourth RF connector.

8. The up-converter according to claim 1, characterized in that: A second circuit board is also disposed in the cavity, and a power module is disposed on the second circuit board. The input end of the power module is connected to the low-frequency connector disposed on the first side of the cavity, and the output end is connected to the first circuit board.

9. The up-converter according to claim 1, characterized in that: The upper end surface of the cavity is provided with a first cover plate.

10. The up-converter according to claim 1, characterized in that: A second cover plate is arranged on the lower end surface of the cavity.

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