Cable television trunk amplifier of DOCSIS4.0 system

Abstract

The utility model discloses a cable television trunk amplifier of a DOCSIS4.0 system, which is characterized in that a mixed end of a first bidirectional filter circuit is connected with a radio frequency signal of a cable television bidirectional hybrid optical fiber coaxial network of the DOCSIS4.0 system, and a high-frequency end of the first bidirectional filter circuit is connected with an input end of a first downlink attenuation circuit; the output end of the first downlink attenuation circuit is connected with the input end of the first downlink equalization circuit, the output end of the first downlink equalization circuit is connected with the input end of the first downlink amplification circuit, and the output end of the first downlink amplification circuit is connected with the input end of the second downlink attenuation circuit. The output end of the second downlink attenuation circuit is connected with the input end of the second downlink equalization circuit, the output end of the second downlink equalization circuit is connected with the input end of the second downlink amplification circuit, and the output end of the second downlink amplification circuit is connected with the high-frequency end of the second bidirectional filter circuit. And the mixed end of the second bidirectional filter circuit is connected with a DOCSIS4.0 system cable television bidirectional hybrid optical fiber coaxial network radio frequency signal.

Description

Technical Field

[0001] The utility model relates to the technical field of cable television, in particular to a cable television trunk amplifier of a DOCSIS4.0 system. Background Art

[0002] DOCSIS4.0 is a new specification of the Cable Television Standards Organization for Hybrid Fiber / Coaxial Cable (HFC) networks. DOCSIS4.0 adds a new extended spectrum function and expands the operating frequency to 1.8 GHz, which is much higher than the 1.2 GHz currently supported by DOCSIS3.1.

[0003] As an important transmission device in the bidirectional HFC network of cable TV, optical nodes are widely used in cable TV systems. The DOCSIS3.1 trunk amplifiers currently used in cable TV systems will not work properly and must be replaced with DOCSIS4.0 cable TV trunk amplifiers.

[0004] In view of the problems existing in the prior art, a cable TV trunk amplifier of a DOCSIS4.0 system is provided. Utility Model Content

[0005] The utility model aims to provide a cable TV trunk amplifier of a DOCSIS4.0 system in view of the defects of the prior art.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A cable TV trunk amplifier of a DOCSIS4.0 system, comprising a first bidirectional filtering circuit, a second bidirectional filtering circuit, a first downstream attenuation circuit, a first downstream equalizing circuit, a first downstream amplifying circuit, a second downstream attenuation circuit, a second downstream equalizing circuit, a second downstream amplifying circuit, a first upstream attenuation circuit, a first upstream equalizing circuit, a first upstream amplifying circuit, a second upstream attenuation circuit, a second upstream equalizing circuit, and a second upstream amplifying circuit;

[0008] The hybrid end of the first bidirectional filtering circuit is connected to the radio frequency signal of the bidirectional hybrid fiber-coaxial network of the DOCSIS4.0 system cable TV, the high frequency end of the first bidirectional filtering circuit is connected to the input end of the first downstream attenuation circuit, the output end of the first downstream attenuation circuit is connected to the input end of the first downstream equalizing circuit, the output end of the first downstream equalizing circuit is connected to the input end of the first downstream amplifying circuit, the output end of the first downstream amplifying circuit is connected to the input end of the second downstream attenuating circuit, the output end of the second downstream attenuating circuit is connected to the input end of the second downstream equalizing circuit, the output end of the second downstream equalizing circuit is connected to the input end of the second downstream amplifying circuit, the output end of the second downstream amplifying circuit is connected to the high frequency end of the second bidirectional filtering circuit, and the hybrid end of the second bidirectional filtering circuit is connected to the radio frequency signal of the bidirectional hybrid fiber-coaxial network of the DOCSIS4.0 system cable TV;

[0009] The low-frequency end of the second bidirectional filtering circuit is connected to the input end of the first uplink attenuation circuit, the output end of the first uplink attenuation circuit is connected to the input end of the first uplink equalizing circuit, the output end of the first uplink equalizing circuit is connected to the input end of the first uplink amplifying circuit, the output end of the first uplink amplifying circuit is connected to the input end of the second uplink attenuation circuit, the output end of the second uplink attenuation circuit is connected to the input end of the second uplink equalizing circuit, the output end of the second uplink equalizing circuit is connected to the input end of the second uplink amplifying circuit, and the output end of the second uplink amplifying circuit is connected to the low-frequency end of the first bidirectional filtering circuit.

[0010] Furthermore, the first bidirectional filtering circuit and the second bidirectional filtering circuit adopt a model of ZBB 5-204 / 258-1800MH.

[0011] Furthermore, the first downstream attenuation circuit, the first downstream equalization circuit, the second downstream attenuation circuit, the second downstream equalization circuit, the first upstream attenuation circuit, the first upstream equalization circuit, the second upstream attenuation circuit, and the second upstream equalization circuit all use passive pluggable devices.

[0012] Furthermore, the model of the first downstream amplifier circuit is QPL7420.

[0013] Furthermore, the model of the second downstream amplifier circuit is QPL1821.

[0014] Furthermore, the model of the first uplink amplifier circuit is AE618.

[0015] Furthermore, the model of the second uplink amplifier circuit is Egi3002024R.

[0016] Compared with the prior art, the cable TV trunk amplifier of the DOCSIS4.0 system of the utility model complies with the new specification of the cable TV standards organization for the hybrid fiber or coaxial cable (HFC) network DOCSIS4.0 standard, and is an important transmission equipment for the cable TV DOCSIS4.0 bidirectional HFC network. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a structural diagram of a cable TV trunk amplifier of a DOCSIS4.0 system provided in an embodiment. DETAILED DESCRIPTION

[0018] The following describes the implementation of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0019] The utility model aims to provide a cable TV trunk amplifier of a DOCSIS4.0 system in view of the defects of the prior art.

[0020] Example

[0021] This embodiment provides a cable TV trunk amplifier of a DOCSIS4.0 system, such as Figure 1 As shown, it is installed in a cable TV bidirectional hybrid fiber coaxial network (i.e., a bidirectional HFC network), and includes a first bidirectional filtering circuit 1, a second bidirectional filtering circuit 2, a first downstream attenuation circuit 3, a first downstream equalizing circuit 4, a first downstream amplifying circuit 5, a second downstream attenuation circuit 6, a second downstream equalizing circuit 7, a second downstream amplifying circuit 8, a first upstream attenuation circuit 9, a first upstream equalizing circuit 10, a first upstream amplifying circuit 11, a second upstream attenuation circuit 12, a second upstream equalizing circuit 13, and a second upstream amplifying circuit 14.

[0022] The mixed end of the first bidirectional filtering circuit 1 is a first RF signal port, which is connected to the downstream and upstream RF signals of the DOCSIS4.0 system cable TV bidirectional HFC network. The high frequency end of the first bidirectional filtering circuit 1 is connected to the input end of the first downstream attenuation circuit 3, the output end of the first downstream attenuation circuit 3 is connected to the input end of the first downstream equalizing circuit 4, the output end of the first downstream equalizing circuit 4 is connected to the input end of the first downstream amplifying circuit 5, the output end of the first downstream amplifying circuit 5 is connected to the input end of the second downstream attenuation circuit 6, the output end of the second downstream attenuation circuit 6 is connected to the input end of the second downstream equalizing circuit 7, the output end of the second downstream equalizing circuit 7 is connected to the input end of the second downstream amplifying circuit 8, the output end of the second downstream amplifying circuit 8 is connected to the high frequency end of the second bidirectional filtering circuit 2, the mixed end of the second bidirectional filtering circuit 2 is a second RF signal port, and the second RF signal port is connected to the downstream and upstream RF signals of the DOCSIS4.0 system bidirectional HFC network.

[0023] The first bidirectional filtering circuit 1 and the second bidirectional filtering circuit 2 both adopt the bidirectional filtering circuit of Zheguang Technology, model ZBB 5-204 / 258-1800MH. According to the requirements of the DOCSIS4.0 cable TV system, the operating frequency range of the upstream RF signal of the bidirectional filtering circuit is 5MHz-204MHz, and the operating frequency range of the downstream RF signal is 258MHz-1800MHz. The bidirectional filtering circuit has good in-band flatness, high reflection loss and mutual isolation, and low signal insertion loss.

[0024] The first downstream attenuation circuit 3, the first downstream equalizing circuit 4, the second downstream attenuation circuit 6, and the second downstream equalizing circuit 7 all use passive pluggable devices from Ningbo Fenghua Yinxin. Different passive pluggable attenuators or equalizers can be selected according to different attenuation or equalization amounts. The operating frequency range is 5MHz-1800MHz.

[0025] The first downstream amplifier circuit 5 uses an amplifier chip of QORVO Corporation of the United States, model QPL7420, which is a low-noise, high-linearity GaAs pHEMT radio frequency amplifier with an operating frequency range of 5MHz-1800MHz and a gain of 20dB.

[0026] The second downstream amplifier circuit 8 uses a power amplifier chip from QORVO of the United States, model QPL1821, which is a GaAs pHEMT RF amplifier with ultra-high linearity index, supporting broadband DOCSIS 4.0 cable TV system applications, with an operating frequency range of 5MHz-1800MHz and a gain of 19dB.

[0027] The low frequency end of the second bidirectional filtering circuit 2 is connected to the input end of the first uplink attenuation circuit 9, the output end of the first uplink attenuation circuit 9 is connected to the input end of the first uplink equalizing circuit 10, the output end of the first uplink equalizing circuit 10 is connected to the input end of the first uplink amplifying circuit 11, the output end of the first uplink amplifying circuit 11 is connected to the input end of the second uplink attenuation circuit 12, the output end of the second uplink attenuation circuit 12 is connected to the input end of the second uplink equalizing circuit 13, the output end of the second uplink equalizing circuit 13 is connected to the input end of the second uplink amplifying circuit 14, the output end of the second uplink amplifying circuit 14 is connected to the low frequency end of the first bidirectional filtering circuit 1, the mixing end of the first bidirectional filtering circuit 1 is the first RF signal port, and the first RF signal port is connected to the downstream and upstream RF signals of the DOCSIS4.0 cable TV bidirectional HFC network.

[0028] The first uplink attenuation circuit 9, the first uplink equalization circuit 10, the second uplink attenuation circuit 12, and the second uplink equalization circuit 13 all use passive pluggable devices from Ningbo Fenghua Yinxin. Different passive pluggable equalizers or attenuators can be selected according to different equalization amounts or attenuation amounts. The operating frequency range is 5MHz-1800MHz.

[0029] The first uplink amplifier circuit 11 adopts the AE618 gallium arsenide enhancement mode low noise and high linearity power amplifier chip of RFHIC Company, with an operating frequency range of 5MHz-1000MHz and a gain of 20dB.

[0030] The second uplink amplifier circuit 14 adopts the Shenzhen Vanward Technology Egi3002024R high linearity power amplifier module with an operating bandwidth of 5-300MHz and a gain of 20dB.

[0031] The cable TV trunk amplifier of the DOCSIS4.0 system of the utility model complies with the new specification of the cable TV standard organization for the hybrid optical fiber or coaxial cable (HFC) network DOCSIS4.0 standard, and is an important transmission device for the cable TV DOCSIS4.0 bidirectional HFC network.

[0032] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention is described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A cable TV trunk amplifier for a DOCSIS4.0 system, characterized in that: It includes a first bidirectional filtering circuit, a second bidirectional filtering circuit, a first downlink attenuation circuit, a first downlink equalizing circuit, a first downlink amplifying circuit, a second downlink attenuation circuit, a second downlink equalizing circuit, a second downlink amplifying circuit, a first uplink attenuation circuit, a first uplink equalizing circuit, a first uplink amplifying circuit, a second uplink attenuation circuit, a second uplink equalizing circuit, and a second uplink amplifying circuit; The hybrid end of the first bidirectional filtering circuit is connected to the radio frequency signal of the bidirectional hybrid fiber-coaxial network of the DOCSIS4.0 system cable TV, the high frequency end of the first bidirectional filtering circuit is connected to the input end of the first downstream attenuation circuit, the output end of the first downstream attenuation circuit is connected to the input end of the first downstream equalizing circuit, the output end of the first downstream equalizing circuit is connected to the input end of the first downstream amplifying circuit, the output end of the first downstream amplifying circuit is connected to the input end of the second downstream attenuating circuit, the output end of the second downstream attenuating circuit is connected to the input end of the second downstream equalizing circuit, the output end of the second downstream equalizing circuit is connected to the input end of the second downstream amplifying circuit, the output end of the second downstream amplifying circuit is connected to the high frequency end of the second bidirectional filtering circuit, and the hybrid end of the second bidirectional filtering circuit is connected to the radio frequency signal of the bidirectional hybrid fiber-coaxial network of the DOCSIS4.0 system cable TV; The low-frequency end of the second bidirectional filtering circuit is connected to the input end of the first uplink attenuation circuit, the output end of the first uplink attenuation circuit is connected to the input end of the first uplink equalizing circuit, the output end of the first uplink equalizing circuit is connected to the input end of the first uplink amplifying circuit, the output end of the first uplink amplifying circuit is connected to the input end of the second uplink attenuation circuit, the output end of the second uplink attenuation circuit is connected to the input end of the second uplink equalizing circuit, the output end of the second uplink equalizing circuit is connected to the input end of the second uplink amplifying circuit, and the output end of the second uplink amplifying circuit is connected to the low-frequency end of the first bidirectional filtering circuit.

2. A cable TV trunk amplifier for a DOCSIS 4.0 system according to claim 1, characterized in that: The first bidirectional filtering circuit and the second bidirectional filtering circuit adopt the model ZBB 5-204 / 258-1800MH.

3. A cable TV trunk amplifier for a DOCSIS 4.0 system according to claim 2, characterized in that: The first downstream attenuation circuit, the first downstream equalization circuit, the second downstream attenuation circuit, the second downstream equalization circuit, the first upstream attenuation circuit, the first upstream equalization circuit, the second upstream attenuation circuit, and the second upstream equalization circuit all use passive pluggable components.

4. The cable TV trunk amplifier of a DOCSIS 4.0 system according to claim 3, characterized in that: The model used by the first downstream amplifier circuit is QPL7420.

5. A cable TV trunk amplifier for a DOCSIS 4.0 system according to claim 4, characterized in that: The model used by the second downstream amplifier circuit is QPL1821.

6. A cable TV trunk amplifier for a DOCSIS 4.0 system according to claim 5, characterized in that: The model used by the first uplink amplifier circuit is AE618.

7. A cable TV trunk amplifier for a DOCSIS 4.0 system according to claim 6, characterized in that: The model of the second uplink amplifier circuit is Egi3002024R.

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