A wired transmission amplifier that supports signal enhancement

Abstract

This invention relates to a wired transmission amplifier that supports signal enhancement, suitable for scenarios such as cable television and broadband networks. The amplifier includes a wideband low-noise amplification module, an adaptive gain control module, an anti-interference filtering module, and a power supply regulation and isolation module. The wideband low-noise amplification module uses a MAX3550 RF amplifier chip and a parallel feedback circuit to achieve low-noise balanced amplification in the 5MHz to 1200MHz range. The adaptive gain control module, based on an AD8367 variable gain amplifier and a detector feedback loop, automatically adjusts the gain to stabilize the output level. The anti-interference filtering module uses a surface acoustic wave filter to suppress out-of-band interference by 40dB. The power supply regulation and isolation module uses an LM317 voltage regulator and a TLP521 opto-isolator to provide low-ripple voltage regulation and isolate external noise. This invention has the advantages of stable gain, low noise, and strong anti-interference capability, and can significantly improve the quality of long-distance wired signal transmission.

Description

Technical Field

[0001] This utility model relates to the field of amplifiers, specifically a wired transmission amplifier that supports signal enhancement. Background Technology

[0002] In existing wired signal transmission systems, long-distance transmission often relies on wired amplifiers for signal compensation. However, traditional amplifiers commonly suffer from insufficient gain, noise accumulation, and weak anti-interference capabilities in practical applications. After a signal passes through multiple amplification and transmission stages, the gain curve becomes uneven, leading to inconsistent signal amplitudes across different frequency bands and affecting signal quality. Furthermore, noise gradually accumulates during long-distance transmission, further reducing the signal-to-noise ratio.

[0003] In various application scenarios, such as cable television and broadband networks, transmission lines are often subject to interference from the external electromagnetic environment. If the amplifier itself has weak anti-interference capabilities, phenomena such as image pixelation and data packet loss can easily occur. In traditional designs, functions such as signal amplification, gain control, filtering, and power isolation are scattered and poorly matched, making it difficult to maintain stable overall performance over long distances. Therefore, how to achieve wideband low-noise amplification, adaptive gain adjustment, effective filtering, and power isolation in a single amplifier structure to improve signal amplification efficiency and transmission quality has become an urgent technical problem to be solved. Summary of the Invention

[0004] The purpose of this invention is to provide a wired transmission amplifier that supports signal enhancement, thereby solving the problems of insufficient gain, noise accumulation, and weak anti-interference capability of existing wired signal transmission amplifiers during long-distance transmission.

[0005] To achieve the above objectives, the present invention proposes the following technical solution: a wired transmission amplifier that supports signal enhancement, comprising a wideband low-noise amplification module, an adaptive gain control module, an anti-interference filtering module, and a power supply regulation and isolation module; in, The wideband low-noise amplifier module is used to amplify the input wideband signal with low noise and optimize the gain flatness. The adaptive gain control module is used to automatically adjust the output gain according to the input signal strength. The anti-interference filtering module is used to filter out out-of-band interference signals; The power supply regulation and isolation module is used to provide low-ripple regulated power to each module and isolate external noise.

[0006] Furthermore, in this utility model, the wideband low-noise amplification module includes a MAX3550 RF amplifier chip and a parallel feedback circuit. The MAX3550 RF amplifier chip operates in the frequency range of 5MHz to 1200MHz and has a noise figure of no more than 2.5dB. The parallel feedback circuit is used to control the gain flatness fluctuation within ±1dB.

[0007] Furthermore, in this invention, the adaptive gain control module includes an AD8367 variable gain amplifier and a detection feedback loop. The AD8367 variable gain amplifier supports gain adjustment in the range of -5dB to +45dB, and the detection feedback loop is used to automatically adjust the gain of the AD8367 variable gain amplifier according to the input signal strength.

[0008] Furthermore, in this invention, the anti-interference filtering module includes a TAI-SAW TA1090EC surface acoustic wave filter, and the out-of-band rejection capability of the surface acoustic wave filter is not less than 40dB.

[0009] Furthermore, in this utility model, the power supply regulation and isolation module includes an LM317 voltage regulator and a TLP521 opto-isolator. The LM317 voltage regulator is used to provide a low-ripple regulated power supply for the wideband low-noise amplifier module, the adaptive gain control module, and the anti-interference filter module. The TLP521 opto-isolator is used to isolate the power supply from external circuits.

[0010] Furthermore, in this invention, the input terminal of the wideband low-noise amplifier module is connected to a signal input port, and the input terminal of the power supply regulator and isolation module is connected to an external DC power supply interface.

[0011] Furthermore, in this invention, the modules transmit signals through radio frequency coaxial cables and are powered by independent power supply traces on the printed circuit board to reduce crosstalk and interference.

[0012] Furthermore, in this invention, the wideband low-noise amplification module, the adaptive gain control module, and the anti-interference filtering module are fixedly installed inside a metal shielding housing, which is connected to a grounding terminal to enhance electromagnetic interference resistance.

[0013] Furthermore, in this invention, an insulating partition is provided between the power supply stabilization and isolation module and the metal shielding housing to reduce interference coupling between the power supply section and the signal section.

[0014] Furthermore, in this invention, the amplifier is suitable for cable television signal transmission, broadband network signal transmission, and other scenarios requiring long-distance wired signal transmission.

[0015] This application addresses the problems of insufficient gain, noise accumulation, and weak anti-interference capability in long-distance wired signal transmission through systematic integration of hardware circuits. It optimizes these issues simultaneously from four underlying aspects: signal amplification, gain adjustment, interference suppression, and power supply stability. Firstly, in the initial stage of the amplifier, a wideband low-noise amplification module combines a low-noise RF amplifier chip with a parallel feedback circuit. This not only provides stable gain across the entire frequency band from 5MHz to 1200MHz but also suppresses gain curve fluctuations. This physically reduces signal amplitude inconsistencies caused by differences in amplification factors at different frequencies. Simultaneously, the lower noise figure reduces the detrimental effect of the primary amplification stage on the signal-to-noise ratio.

[0016] Secondly, the adaptive gain control module forms a closed-loop control through a variable gain amplifier and a detection feedback loop. It senses the input signal strength in real time and dynamically adjusts the gain. In principle, it uses the feedback loop to compare the output signal level with the set reference value and drives the gain element to automatically adjust within the range of -5dB to +45dB. This avoids distortion caused by excessively strong input or insufficient amplification caused by excessively weak input, thus achieving dynamic balance of the output level in long-distance links.

[0017] Secondly, the anti-interference filtering module, based on the frequency selectivity of surface acoustic wave (SAW) filters, provides up to 40dB of suppression against out-of-band interference signals such as 4G / 5G. This principle utilizes the characteristic of piezoelectric materials generating and transmitting sound waves at specific frequencies to significantly attenuate the energy of non-target frequency bands, thereby reducing the damage of the external electromagnetic environment to the effective signal. Finally, the power supply regulation and isolation module uses a voltage regulator to reduce power supply ripple and uses an opto-isolator to electrically cut off the conduction path of external noise, eliminating ground loop interference and power supply noise coupling at the power supply level.

[0018] Through the synergistic effect of the above-mentioned links in the underlying physical and circuit principles, this application achieves signal quality optimization across the entire link from input to output. This not only improves the gain consistency and signal-to-noise ratio in a wide frequency band, but also enhances the ability to resist external interference, thereby effectively solving the performance degradation problem of traditional wired transmission amplifiers in long-distance transmission. Beneficial effects: The technical solution of this application has the following technical effects: 1. This utility model integrates a wideband low-noise amplification module, an adaptive gain control module, an anti-interference filtering module, and a power supply regulation and isolation module into a single amplifier structure, enabling an optimized collaborative working mechanism for signal amplification, adjustment, filtering, and power supply processes. This structural design effectively improves the consistency of signals across different frequency bands and avoids signal distortion caused by insufficient gain or amplitude imbalance during long-distance transmission.

[0019] 2. By simultaneously incorporating low-noise amplification, dynamic gain adjustment, interference suppression, and power isolation into its hardware structure, this invention significantly improves the signal-to-noise ratio and stability of signal transmission. In scenarios requiring long-distance transmission, such as cable television and broadband networks, it reduces noise accumulation and the impact of external interference, thereby ensuring clear transmitted images and reliable data transmission. Overall performance is significantly improved compared to traditional amplifiers.

[0020] It should be understood that all combinations of the foregoing concepts and the additional concepts described in more detail below can be considered as part of the utility model subject matter of this disclosure, provided that such concepts do not contradict each other.

[0021] The foregoing and other aspects, embodiments, and features of the present invention will be more fully understood from the following description in conjunction with the accompanying drawings. Other additional aspects of the present invention, such as features and / or beneficial effects of exemplary embodiments, will become apparent from the following description or may be learned through practice of specific embodiments according to the teachings of the present invention. Attached Figure Description

[0022] The accompanying drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component shown in the various figures may be denoted by the same reference numeral. For clarity, not every component is labeled in each figure. Embodiments of various aspects of the present invention will now be described by way of example and with reference to the accompanying drawings, wherein: Figure 1 This is a schematic diagram of the structure of this utility model. Detailed Implementation

[0023] To better understand the technical content of this utility model, specific embodiments are described below in conjunction with the accompanying drawings. Various aspects of this utility model are described in this disclosure with reference to the accompanying drawings, which illustrate numerous illustrative embodiments. The embodiments of this disclosure are not necessarily defined to include all aspects of this utility model. It should be understood that the various concepts and embodiments described above, as well as those described in more detail below, can be implemented in any of many ways, because the concepts and embodiments disclosed in this utility model are not limited to any particular implementation. Furthermore, some aspects of this utility model can be used alone or in any suitable combination with other aspects disclosed in this utility model.

[0024] This embodiment provides a wired transmission amplifier that supports signal enhancement, including a wideband low-noise amplification module, an adaptive gain control module, an anti-interference filtering module, and a power supply regulation and isolation module. The overall structure is fixedly installed in a metal shielded housing. The modules are connected via RF coaxial cables and powered through independent power supply traces on a printed circuit board to reduce crosstalk and interference.

[0025] The wideband low-noise amplifier module is located between the signal input port and the adaptive gain control module. Internally, it includes a MAX3550 RF amplifier chip and a parallel feedback circuit. The MAX3550 RF amplifier chip operates in the frequency range of 5MHz to 1200MHz, with a noise figure of no more than 2.5dB, enabling low-noise amplification over a wide frequency range. The parallel feedback circuit controls gain flatness fluctuations within ±1dB, ensuring consistent signal amplitude across frequency bands and reducing distortion caused by uneven frequency response. The purpose of this module is to provide high-quality amplification of the input signal at the first stage of the signal chain while maintaining the original signal-to-noise ratio to the maximum extent possible.

[0026] The adaptive gain control module is located between the wideband low-noise amplification module and the anti-interference filtering module. Internally, it includes an AD8367 variable gain amplifier and a detection feedback loop. The AD8367 variable gain amplifier supports a continuously adjustable gain range of -5dB to +45dB. The detection feedback loop detects the input signal level in real time and compares it with a set reference value, automatically driving the AD8367 to adjust the gain to prevent overload distortion or insufficient amplification. The advantage of this module is its ability to output a stable signal level under different input strength conditions, improving link stability.

[0027] The anti-interference filtering module is located between the adaptive gain control module and the signal output port, and internally includes a TAI-SAW TA1090EC surface acoustic wave filter. This filter utilizes the frequency selectivity of piezoelectric materials to maintain low insertion loss within the target operating frequency band, while achieving up to 40dB out-of-band rejection in non-target frequency bands, effectively filtering out interference signals from 4G / 5G and other wireless communication technologies, thereby improving signal purity. The purpose of this module is to block external electromagnetic interference from damaging the effective signal and enhance the system's anti-interference capability.

[0028] The power supply regulation and isolation module is located between the power input terminal and the aforementioned signal processing modules. Internally, it includes an LM317 voltage regulator and a TLP521 opto-isolator. The LM317 voltage regulator provides low-ripple regulated power to each signal processing module, preventing power fluctuations from affecting signal quality. The TLP521 opto-isolator electrically disconnects the direct path between the external power supply and the internal circuitry, effectively preventing ground loop interference and power supply noise coupling into the signal link. The advantage of this module is that it ensures the power supply stability and electrical isolation of the entire amplifier system.

[0029] Regarding the signal transmission path, the external input signal first enters the wideband low-noise amplifier module through the signal input port for primary low-noise amplification and is then output to the adaptive gain control module. The adaptive gain control module adjusts the amplification factor according to the real-time detected signal strength and outputs it to the anti-interference filter module. After filtering out-of-band interference, the anti-interference filter module transmits the purified signal to the signal output port for output to the next stage device. Regarding the power supply path, the external DC power supply enters the power regulation and isolation module through the power input port. After regulation and isolation, it supplies power to the wideband low-noise amplifier module, the adaptive gain control module, and the anti-interference filter module, respectively.

[0030] The working principle is as follows: After receiving an external input signal, the amplifier first performs equal amplification across the entire frequency range using a wideband low-noise amplification module, while maintaining a low noise figure to preserve the signal-to-noise ratio. Then, an adaptive gain control module dynamically adjusts the gain based on the input signal strength to ensure stable output signal amplitude. Next, an anti-interference filtering module filters out external out-of-band interference signals. Finally, the processed signal is output to the next transmission node. Throughout the process, the power supply regulation and isolation module continuously provides stable power support to each functional module and isolates external noise, ensuring stable operation of the system even in complex electromagnetic environments. This solves the problems of insufficient gain, noise accumulation, and weak anti-interference capability of traditional wired amplifiers in long-distance transmission.

[0031] The technical solution of this application solves the technical problems of insufficient gain, noise accumulation, and weak anti-interference capability in long-distance wired signal transmission through systematic improvements to the hardware module. These improvements are entirely based on the design and optimization of the hardware circuit and do not depend on any improvements to the program algorithm. Specifically: The module employs the MAX3550 RF amplifier chip and a parallel feedback circuit. The MAX3550 chip provides low-noise amplification across a wide frequency band from 5MHz to 1200MHz, with a noise figure ≤2.5dB. The parallel feedback circuit optimizes gain flatness through circuit topology, controlling ripple within ±1dB. This hardware design addresses the issues of insufficient gain and inconsistent signal amplitude across different frequency bands inherent in traditional amplifiers through physical-level signal amplification and frequency response equalization. The module's functionality is entirely based on the chip's RF amplification characteristics and the electrical characteristics of the feedback circuit, requiring no software or algorithm control; signal amplification and gain flatness are directly implemented by the hardware circuitry.

[0032] A closed-loop control system is constructed using the AD8367 variable gain amplifier and a detection feedback loop. The AD8367 supports gain adjustment from -5dB to +45dB. The detection feedback loop detects the input signal level in real time through hardware circuitry and automatically adjusts the gain through the feedback mechanism of the analog circuitry. This design achieves dynamic balance of the output level through hardware closed-loop control, avoiding signal distortion or under-amplification. Gain adjustment is based on the hardware analog feedback loop, relying on the built-in gain control function of the AD8367 and the level comparison of the detection circuitry. No digital signal processing or program algorithms are required; the purely hardware circuitry can perform adaptive adjustment.

[0033] The TAI-SAW TA1090EC surface acoustic wave filter utilizes the frequency selectivity of piezoelectric materials to maintain low insertion loss within the target frequency band while providing ≥40dB suppression of out-of-band interference. This filtering effect is achieved through the filter's physical structure and material properties, significantly reducing the impact of external electromagnetic interference on the signal. The filtering function is entirely based on the physical frequency selectivity mechanism of the surface acoustic wave filter, requiring no algorithmic processing; the hardware itself can attenuate the interference signal.

[0034] The LM317 voltage regulator provides a low-ripple regulated power supply, while the TLP521 opto-isolator achieves electrical isolation between the power supply and external circuits. The LM317 reduces power fluctuations through circuit design, while the TLP521 uses photoelectric conversion to cut off external noise conduction paths, thereby eliminating ground loop interference and power supply noise coupling. Voltage regulation and isolation are achieved through hardware circuit voltage adjustment and opto-isolation, requiring no program control; the hardware module directly ensures power supply stability and noise isolation.

[0035] Signals are transmitted between modules via RF coaxial cables. Independent power supply traces are used on the printed circuit board to reduce crosstalk. The signal processing module is mounted in a metal shielded housing and grounded. An insulating partition is placed between the power supply module and the signal module. These hardware layouts and shielding designs further enhance interference immunity and signal integrity. The improvements in signal transmission, power supply, and interference immunity are all achieved through physical connections, circuit layout, and shielding materials, without the need for software or algorithm intervention.

[0036] Solving technical problems relies on hardware improvements. For the insufficient gain issue, the wideband low-noise amplifier module provides stable wideband gain through the MAX3550 chip and parallel feedback circuit, directly resolving the problems of insufficient and uneven gain. Regarding noise accumulation, the low-noise chip (MAX3550, noise figure ≤2.5dB) and the regulated power supply (LM317) reduce noise introduction through hardware design, while the detection feedback loop (AD8367) optimizes the signal level through analog circuitry, collectively reducing noise accumulation. The weak anti-interference capability is significantly enhanced through hardware-based frequency selection, electrical isolation, and electromagnetic shielding of the surface acoustic wave filter (TAI-SAW TA1090EC), opto-isolator (TLP521), metal shielding housing, and insulating partition.

[0037] The functions of each module, such as amplification, gain adjustment, filtering, voltage regulation and isolation, are all implemented based on the physical characteristics of hardware components and circuit design. For example, the RF amplification of MAX3550, the analog gain control of AD8367, the frequency selection of TAI-SAW filter, the voltage regulation of LM317 and the opto-isolation of TLP521 do not depend on digital signal processing or software algorithms.

[0038] This application optimizes the performance of long-distance wired signal transmission in four aspects—signal amplification, gain adjustment, interference suppression, and power supply stability—through the hardware design and integration of a wideband low-noise amplification module, an adaptive gain control module, an anti-interference filtering module, and a power supply regulation and isolation module. The solutions to all technical problems rely on the physical characteristics and structural optimization of the hardware circuits, without involving any improvements to program algorithms, fully demonstrating the independence and effectiveness of the hardware module improvements.

[0039] All standard parts used in this application can be purchased from the market, and can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art. The control method is automatic control through a controller. The control circuit of the controller can be implemented by simple programming by those skilled in the art and is common knowledge in the field. Since this application is mainly used to protect mechanical devices, this application will not explain the control method and circuit connection in detail.

[0040] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Those skilled in the art to which this invention pertains can make various modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of this invention shall be determined by the claims.

Claims

1. A wireline transmission amplifier supporting signal enhancement, characterized by It includes a wideband low-noise amplifier module, an adaptive gain control module, an anti-interference filter module, and a power supply regulation and isolation module; in, The wideband low-noise amplifier module is used to amplify the input wideband signal with low noise and optimize the gain flatness. The adaptive gain control module is used to automatically adjust the output gain according to the input signal strength. The anti-interference filtering module is used to filter out out-of-band interference signals; The power supply regulation and isolation module is used to provide low-ripple regulated power to each module and isolate external noise.

2. The cable transmission amplifier supporting signal enhancement of claim 1, wherein, The wideband low-noise amplifier module includes a MAX3550 RF amplifier chip and a parallel feedback circuit. The MAX3550 RF amplifier chip operates in the frequency range of 5MHz to 1200MHz and has a noise figure of no more than 2.5dB. The parallel feedback circuit is used to control the gain flatness fluctuation within ±1dB.

3. The cable transmission amplifier supporting signal enhancement according to claim 1 or 2, characterized by, The adaptive gain control module includes an AD8367 variable gain amplifier and a detection feedback loop. The AD8367 variable gain amplifier supports gain adjustment from -5dB to +45dB, and the detection feedback loop is used to automatically adjust the gain of the AD8367 variable gain amplifier according to the input signal strength.

4. The cable transmission amplifier supporting signal enhancement according to any one of claims 1 to 3, characterized by, The anti-interference filtering module includes a TAI-SAW TA1090EC surface acoustic wave filter, and the out-of-band suppression capability of the surface acoustic wave filter is not less than 40dB.

5. The cable transmission amplifier supporting signal enhancement according to any one of claims 1 to 4, characterized by, The power supply regulation and isolation module includes an LM317 voltage regulator and a TLP521 opto-isolator. The LM317 voltage regulator is used to provide a low-ripple regulated power supply for the wideband low-noise amplifier module, the adaptive gain control module, and the anti-interference filter module. The TLP521 opto-isolator is used to isolate the power supply from external circuits.

6. The cable transmission amplifier supporting signal enhancement according to any one of claims 1 to 5, characterized by, The input terminal of the wideband low-noise amplifier module is connected to a signal input port, and the input terminal of the power supply regulation and isolation module is connected to an external DC power supply interface.

7. The cable transmission amplifier supporting signal enhancement according to any one of claims 1 to 6, characterized by, The modules transmit signals to each other via radio frequency coaxial cables and are powered by independent power supply traces on the printed circuit board to reduce crosstalk and interference.

8. The cable transmission amplifier supporting signal enhancement according to any one of claims 1 to 7, characterized by, The wideband low-noise amplifier module, adaptive gain control module, and anti-interference filter module are fixedly installed inside a metal shielding housing, which is connected to the grounding terminal to improve electromagnetic interference resistance.

9. The cable transmission amplifier supporting signal enhancement of claim 8, wherein, An insulating partition is provided between the power supply stabilization and isolation module and the metal shielding housing to reduce interference coupling between the power supply section and the signal section.

10. The cable transmission amplifier supporting signal enhancement according to any one of claims 1 to 9, characterized by, The amplifier is suitable for cable TV signal transmission, broadband network signal transmission, and other scenarios requiring long-distance wired signal transmission.

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