CN102436199B - One-chip microcomputer controlled attenuation circuit used for optical receiver of cable television network - Google Patents
One-chip microcomputer controlled attenuation circuit used for optical receiver of cable television network Download PDFInfo
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Abstract
The invention, which belongs to the cable television technology field, relates to a one-chip microcomputer controlled attenuation circuit used for an optical receiver of a cable television network. The attenuation circuit comprises inductors L1 and L2, capacitors C1 to C10, an electrolytic capacitor C11, a light emitting diode D1, resistors R1 to R10, a signal couplers Z1 and Z2, amplifier tubes U1 and U2, chips Q1, U3, and U4, a control unit U5, and sockets JP1 and JP2. The amplifier tubes U1 and U2 are an F226 type; the chip U3 is a PIC16F887-04 one-chip microcomputer chip; the chip U4 is a PE4304 radio frequency digital attenuation chip; the control unit U5 is a GSD-008 display control unit; and the chip Q1 is an MCP1541votlage reference chip. According to the invention, the attenuation circuit has advantages of convenient output level adjustment, low cost, convenience for upgrading and capacity expanding, and high security and reliability and the like.
Description
Technical field
The present invention relates to a kind of Single-chip Controlling attenuator circuit that is applied to cable television network optical receiver, belong to the CATV technical field, especially the transformation of hybrid fiber coax bilateral network is a kind of based on the CATV optical transmission device
Background technology
to the end of the year 2009, national electrophone TV user reaches 1.74 hundred million families.On January 13rd, 2010, Premier Wen Jiabao's formal proposition in the Executive Meeting of the State Council of holding accelerates to advance China Telecom's net, broadcasting and television network and the internet integration of three networks, and the clear and definite timetable of the integration of three networks.On June 6th, 2010, China has passed through integration of three networks pilot scheme, and has confirmed 12 experimental cities and area July 1.After the integration of three networks realized, broadcasting and television network not only can provide TV programme, and internet and voice communication service can also be provided.For internet and communication network, also can develop business such as Web TV, mobile TV better, share the abundant program resource of broadcasting and television network.It is basic transmission network transformation that SARFT(The State Administration of Radio and Television) requires one of HFC bilateral network transformation, and basic realization FTTB is wherein arranged, and realizes that progressively Fiber to the home.Along with the continuous upgrading and the transformation of hfc plant, fiber optic network replaces concentric cable rapidly with cheap price, wider coverage, transmission speed and littler failure rate faster.Optical sender and photoreceiver just become the key equipment in the network in hfc plant like this, and here I just develop the Single-chip Controlling attenuator circuit that a ultralow luminous power receives cable television network optical receiver according to the development of CHINA RFTCOM Co Ltd of new generation
Summary of the invention
the objective of the invention is to provide a kind of Single-chip Controlling attenuator circuit that is used for cable television network optical receiver, and its output level is easy to adjust, and cost is lower, is convenient to upgrade expanding, security, reliability height.
the objective of the invention is to reach like this, and a kind of Single-chip Controlling attenuator circuit that is used for cable television network optical receiver comprises inductance L 1, L2, capacitor C 1-C10, electrochemical capacitor C11, light emitting diode D1, resistance R 1-R10, signal coupler Z1, Z2, amplifier tube U1, U2, chip Q1, U3, U4, control module U5 and socket JP1, JP2, and wherein amplifier tube U1, U2 are F226; U3 is the PIC16F887-04 singlechip chip, and U4 is PE4304 RF digital decay chip, and U5 is the GSD-008 indicative control unit, and Q1 is a MCP1541 voltage reference chip; Chip U3 2,4,5,12,13,19-21,23-27,30,31,33-37,42,43 pin be unsettled, 8,9,10,11,14,15 pin of chip U3 connect 2,3,4,9,7,8 pin of control module U5 respectively, 1 pin of the 16 pin combination hub JP1 of chip U3,2 pin of the 17 pin combination hub JP1 of chip U3; 3 pin of socket JP1 meet DC voltage+5V, the 4 pin ground connection of socket JP1, and 5 pin of socket JP1 connect an end of 18 pin of chip U3, resistance R 3, and an end of the other end of resistance R 3, capacitor C 9, the Vin pin of chip Q1 meet DC voltage+5V; The Vss pin of chip Q1, the other end ground connection of capacitor C 9, the Vout pin of chip Q1 connects 22 pin of an end of capacitor C 8, chip U3, the other end ground connection of capacitor C 8,6, the 29 pin ground connection of chip U3; 7,28 pin of chip U3 meet DC voltage+5V, 1 pin connecting resistance R6, one end of chip U3, and 2 pin of the other end combination hub JP2 of resistance R 6,1 pin of socket JP2 meets DC voltage+5V; The end of the 44 pin connecting resistance R5 of chip U3,3 pin of the other end combination hub JP2 of resistance R 5, the 4 pin ground connection of socket JP2, the end of the 32 pin connecting resistance R4 of chip U3; The other end sending and receiving light diode D1 of resistance R 4 is anodal, light emitting diode D1 minus earth, and 38,39,40,41 pin of chip U3 connect 10,11,12,1 pin of control module U5 respectively, and 5 pin of control module U5 meet DC voltage+5V; The 6 pin ground connection of control module U5, the end of the 3 pin connecting resistance R7 of chip U3, the end of the other end connecting resistance R10 of resistance R 7,5 pin of chip U4, the other end ground connection of resistance R 10; 3,4 pin of chip U4 are unsettled, chip U4 0,7,8,10-12,18 pin ground connection, the end of the 13 pin connecting resistance R8 of chip U4, the other end of resistance R 8, an end of capacitor C 10, DC voltage+3V; The other end ground connection of capacitor C 10, chip U4 1, the end of 15-17,19,20 pin connecting resistance R9,6, the 9 pin ground connection of chip U4, another termination DC voltage+3V of resistance R 9; The attenuator circuit input signal is to 2 pin of chip U4, and 14 pin of chip U4 connect an end of capacitor C 1,2 pin of another termination signal coupler Z1 of capacitor C 1, the 1 pin ground connection of signal coupler Z1; 3 pin of signal coupler Z1 connect an end of capacitor C 2,1 pin of another termination amplifier tube U1 of capacitor C 2, the 2 pin ground connection of amplifier tube U1; DC voltage+8V connects the end of electrochemical capacitor C11 positive pole, resistance R 1, R2, electrochemical capacitor C11 minus earth, another termination capacitor C 6 of resistance R 1, an end of inductance L 1; The other end ground connection of capacitor C 6,3 pin of another chip termination U1 of inductance L 1, an end of capacitor C 4,2 pin of another termination signal coupler Z2 of capacitor C 4; 4 pin of signal coupler Z1 connect an end of capacitor C 3,1 pin of another termination amplifier tube U2 of capacitor C 3, the 2 pin ground connection of amplifier tube U2; Another termination capacitor C 7 of resistance R 2, an end of inductance L 2, the other end ground connection of capacitor C 7,3 pin of another chip termination U2 of inductance L 2, an end of capacitor C 5; 1 pin of another termination signal coupler Z2 of capacitor C 5, the 4 pin ground connection of signal coupler Z2,3 pin of signal coupler Z2 connect the final stage amplifying circuit.
the present invention has been owing to adopted above technical scheme, and it is easy to adjust therefore to have an output level, and cost is lower, is convenient to upgrade expanding, security, the advantage that reliability is high.
Description of drawings
Fig. 1 is a schematic diagram of the present invention.
Embodiment
are referring to figure: the attenuator circuit input signal is to RF digital decay chip; Control module is selected the current menu that needs operation through pushbutton switch; The damping capacity of using button key input up and down to need, by SCM program output signal controlling RF digital decay chip, RF digital decay chip signal output is to the inter-stage amplifying circuit; Inter-stage amplifying circuit output signal is accomplished the setting of damping capacity to the final stage amplifying circuit.Use the present of photoreceiver in a large number at network, equipment debugging and maintainer need not to carry a large amount of decay inserted sheets and remove to safeguard and debug photoreceiver, only need the input attenuation amount, have just realized the setting of damping capacity easily.Make full use of existing network; Optical fiber is extended to user side; EPON is transparent fully to signal transfer protocol, format modulation signal, and network can be expanded according to the growth of customer volume, and the user needs higher quality requirements really from now on; Can be directly optic fibre extension to the user, realize that real optical fiber registers one's residence.Network using optical fiber, network structure are very simple, between front end and user, have significantly reduced the active electronic equipment, like light station and amplifier, do not need open-air power supply, and the AC backup of supply power is added up RF PON network according to operator and can be reduced by 90% maintenance than hfc plant.Equipment and number of fibers significantly reduce, and the network architecture is simple and clear, and network is realized passive transmission.
chip Q1, U3, U4, control module U5, socket JP1, JP2, light emitting diode D1, resistance R 3-R10, capacitor C 8-C10 form attenuation control circuit; The attenuator circuit input signal is to 2 pin of chip U4, and 14 pin of the chip U4 of attenuation control circuit output signal is to capacitor C 1; Capacitor C 1 output signal is through signal coupler Z1, capacitor C 2, the C3 input end to amplifier tube U1, U2; DC voltage+8V, capacitor C 11, resistance R 1, R2, capacitor C 6, C7, inductance L 1, L2 form 3 pin that feed circuit are imported amplifier tube U1, U2 respectively; Amplifier tube work; The output amplifying signal is exported signal to the final stage amplifying circuit through capacitor C 4, C5, signal coupler Z2 by 3 pin of signal coupler Z2.Wherein Z1, Z2 are the signal pickup coil, and D1 is a light emitting diode, and L1～L2 is for being High frequency filter direct current overcurrent inductance; C1-C5 is the high frequency capacitance, and C6～C10 is a high-frequency filter capacitor, and C11 is an electrochemical capacitor; R1-R9 is a current-limiting resistance, and R10 is a dropping resistor, and JP1 is the debug data interface; JP2 is the data serial ports, and Q1 is a MCP1541 voltage reference chip, and U1, U2 are the F226 amplifier tube; U3 is the PIC16F887-04 single-chip microcomputer, and U4 is a PE4304 RF digital attenuator chip, and U5 is the GSD-008 indicative control unit.
the most attractive benefit of Single-chip Controlling attenuator circuit is to reduce the network operation cost.When disposing solution, its following points technical advantage:
1. output level is easy to adjust: conventional output level of light receiver need be with well fixing attenuator model; Inconvenient debugging; And the photoreceiver of my company can be through SCM program control; According to the requirement of network design output level slope, through pushbutton switch the damping capacity that needs is set on the equipment easily.
. cost is relatively low; Be convenient to upgrade expanding: make full use of existing network, optical fiber is extended to user side, EPON is transparent fully to signal transfer protocol, format modulation signal; Network can be expanded according to the growth of customer volume; The user needs higher quality requirements really from now on, can be directly optic fibre extension to the user, realize that real optical fiber registers one's residence.
. security, reliability height; Maintainable good: network using optical fiber, network structure are very simple, between front end and user, have significantly reduced the active electronic equipment; Like light station and amplifier; Do not need open-air power supply, the AC backup of supply power is added up RF PON network according to operator and can be reduced by 90% maintenance than hfc plant.Equipment and number of fibers significantly reduce, and the network architecture is simple and clear, and network is realized passive transmission
Claims (1)
1.
A kind of Single-chip Controlling attenuator circuit that is used for cable television network optical receiver is characterized in that comprising inductance L 1, L2, capacitor C 1-C10, electrochemical capacitor C11, light emitting diode D1, resistance R 1-R10, signal coupler Z1, Z2, amplifier tube U1, U2, chip Q1, U3, U4, control module U5 and socket JP1, JP2, and wherein amplifier tube U1, U2 are F226, and U3 is the PIC16F887-04 singlechip chip; U4 is PE4304 RF digital decay chip, and U5 is the GSD-008 indicative control unit, and Q1 is a MCP1541 voltage reference chip, chip U3 2,4,5,12,13,19-21,23-27,30,31,33-37,42,43 pin be unsettled; 8,9,10,11,14,15 pin of chip U3 connect 2,3,4,9,7,8 pin of control module U5 respectively, 1 pin of the 16 pin combination hub JP1 of chip U3, and 2 pin of the 17 pin combination hub JP1 of chip U3,3 pin of socket JP1 meet DC voltage+5V; The 4 pin ground connection of socket JP1,5 pin of socket JP1 connect an end of 18 pin of chip U3, resistance R 3, and an end of the other end of resistance R 3, capacitor C 9, the Vin pin of chip Q1 meet DC voltage+5V, the Vss pin of chip Q1, the other end ground connection of capacitor C 9; The Vout pin of chip Q1 connects an end of capacitor C 8,22 pin of chip U3, the other end ground connection of capacitor C 8, and 6, the 29 pin ground connection of chip U3,7,28 pin of chip U3 meet DC voltage+5V; 1 pin connecting resistance R6, one end of chip U3,2 pin of the other end combination hub JP2 of resistance R 6,1 pin of socket JP2 meets DC voltage+5V, the end of the 44 pin connecting resistance R5 of chip U3; 3 pin of the other end combination hub JP2 of resistance R 5, the 4 pin ground connection of socket JP2, the end of the 32 pin connecting resistance R4 of chip U3, the other end sending and receiving light diode D1 of resistance R 4 is anodal; Light emitting diode D1 minus earth, 38,39,40,41 pin of chip U3 connect 10,11,12,1 pin of control module U5 respectively, and 5 pin of control module U5 meet DC voltage+5V, the 6 pin ground connection of control module U5; The end of the 3 pin connecting resistance R7 of chip U3, the end of the other end connecting resistance R10 of resistance R 7,5 pin of chip U4, the other end ground connection of resistance R 10,3,4 pin of chip U4 are unsettled; Chip U4 0,7,8,10-12,18 pin ground connection, the end of the 13 pin connecting resistance R8 of chip U4, a termination DC voltage+3V of the other end of resistance R 8, capacitor C 10, the other end ground connection of capacitor C 10; Chip U4 1, the end of 15-17,19,20 pin connecting resistance R9,6,9 pin of chip U4 meet DC voltage+3V, another termination DC voltage+3V of resistance R 9, the attenuator circuit input signal is to 2 pin of chip U4; 14 pin of chip U4 connect an end of capacitor C 1,2 pin of another termination signal coupler Z1 of capacitor C 1, the 1 pin ground connection of signal coupler Z1; 3 pin of signal coupler Z1 connect an end of capacitor C 2,1 pin of another termination amplifier tube U1 of capacitor C 2, the 2 pin ground connection of amplifier tube U1; DC voltage+8V connects the end of electrochemical capacitor C11 positive pole, resistance R 1, R2, electrochemical capacitor C11 minus earth, another termination capacitor C 6 of resistance R 1, an end of inductance L 1; The other end ground connection of capacitor C 6,3 pin of another chip termination U1 of inductance L 1, an end of capacitor C 4,2 pin of another termination signal coupler Z2 of capacitor C 4; 4 pin of signal coupler Z1 connect an end of capacitor C 3,1 pin of another termination amplifier tube U2 of capacitor C 3, the 2 pin ground connection of amplifier tube U2; Another termination capacitor C 7 of resistance R 2, an end of inductance L 2, the other end ground connection of capacitor C 7,3 pin of another chip termination U2 of inductance L 2, an end of capacitor C 5; 1 pin of another termination signal coupler Z2 of capacitor C 5, the 4 pin ground connection of signal coupler Z2,3 pin of signal coupler Z2 connect the final stage amplifying circuit
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| CN2011103286308A CN102436199B (en) | 2011-10-26 | 2011-10-26 | One-chip microcomputer controlled attenuation circuit used for optical receiver of cable television network |
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| CN102436199B true CN102436199B (en) | 2012-11-21 |
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| US7672654B2 (en) * | 2005-07-08 | 2010-03-02 | Casio Computer Co., Ltd. | Broadcasting receiver and method of receiving a broadcasting wave |
| JP4685555B2 (en) * | 2005-08-31 | 2011-05-18 | アイホン株式会社 | TV door phone device |
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| CN202267844U (en) * | 2011-10-26 | 2012-06-06 | 常熟市高事达光电科技有限公司 | Singlechip control attenuator circuit for optical receiver of cable TV network |
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Address after: 215532 Jiangsu city of Suzhou province Changshou City ancient town Baimao Industrial Zone Patentee after: Suzhou gaoshida information Polytron Technologies Inc Address before: Changshou City ancient town Baimao Economic Development Zone of Suzhou city of Jiangsu Province in 215532 Patentee before: Changshu Gaoshida Optoelectronic Technology Co., Ltd. |