CN203416269U - Single-chip microcomputer controlled double-way light reception high-isolation switching circuit - Google Patents
Single-chip microcomputer controlled double-way light reception high-isolation switching circuit Download PDFInfo
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- CN203416269U CN203416269U CN201320354540.0U CN201320354540U CN203416269U CN 203416269 U CN203416269 U CN 203416269U CN 201320354540 U CN201320354540 U CN 201320354540U CN 203416269 U CN203416269 U CN 203416269U
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Abstract
A single-chip microcomputer controlled double-way light reception high-isolation switching circuit includes a first light reception PIN pipe and a second light reception PIN pipe both used for receiving inputted optical signals, wherein an output terminal of the first light reception PIN pipe is connected with an input terminal of a first low-noise amplifying tube; an output terminal of the second light reception PIN pipe is connected with an input terminal of a second low-noise amplifying tube; an output terminal of the first low-noise amplifying tube is connected with an input port of a first channel of a radio frequency switching chip used for outputting radio-frequency signals; an output terminal of the second low-noise amplifying tube is connected with an input port of a second channel of the radio frequency switching chip used for outputting the radio-frequency signals; the radio frequency switching chip is connected with a single-chip microcomputer chip which controls the switching between the first channel and the second channel; both the first low-noise amplifying tube and the second low-noise amplifying tube are connected with the single-chip microcomputer chip which supplies power to the low-noise amplifying tubes through the conduction of different triodes. The circuit is low in cost, and the isolation for double-way light reception signals reaches more than 50 dB.
Description
Technical field
The utility model belongs to CATV Technology field, relates to a kind of Single-chip Controlling two-way light-receiving high-isolation commutation circuit that is applied to cable television network optical receiver.
Background technology
Along with the continuous propelling of the integration of three networks, to improving constantly of cable TV network reliability requirement, two light input optical receiver application with active and standby handoff functionality is more and more extensive.On the one hand, along with enriching constantly of Program Transport, cable TV network frequency bandwidth is constantly widened, and is upgraded to 860MHz is upgraded to 1000MHz again from 750MHz.Frequency is higher, and the isolation of radio frequency switching chip is poorer.Conventional radio frequency switches chip application in the optical receiver of 1000MHz bandwidth, and its isolation is conventionally at 20-30dB.From the insulated degree requirement of 40dB poor far.Especially in the mixed cable TV network passing of modulus, it is particularly outstanding that this problem seems, because isolation is inadequate, between two-way light receiving signal, produces and seriously crosstalk, and causes simulated television to occur ghost phenomena, and mosaic phenomenon appears in Digital Television.On the other hand, along with the network Development of light entering and copper back, the deployment of optical receiver is more and more near user side, and quantity is more and more, and cost control requires more and more higher.How providing a kind of not only low-cost but also can realize the two-way optical receiver that high-isolation switches, is the problem of solution of being badly in need of at present.
Summary of the invention
The utility model will solve the low bandwidth of existing two-way optical receiver product, low isolation switches defect, and the Single-chip Controlling two-way light-receiving high-isolation commutation circuit of a kind of low cost, high-isolation is provided.
The technical solution adopted in the utility model is:
A kind of Single-chip Controlling two-way light-receiving high-isolation commutation circuit, it is characterized in that: the first light-receiving PIN pipe and the second light-receiving PIN pipe that comprise the light signal that receives input, the output of described the first light-receiving PIN pipe is connected with the input of the first low noise amplification pipe, the output of described the second light-receiving PIN pipe is connected with the input of the second low noise amplification pipe, the output of described the first low noise amplification pipe is connected with passage one input port that the radio frequency of output radiofrequency signal switches chip, the output of described the second low noise amplification pipe is connected with passage two input ports that the radio frequency of output radiofrequency signal switches chip, the singlechip chip that described radio frequency switches switching between chip and control channel one and passage two is connected, described the first low noise amplification pipe and the second low noise amplification Guan Junyu come to be respectively connected to the singlechip chip of its power supply by the different triodes of conducting.
Further, the positive pole of described the first light-receiving PIN pipe D1 connects capacitor C 1, resistance R 1, capacitor C 1, the other end ground connection of resistance R 1, the negative pole of described the first light-receiving PIN pipe D1 connects capacitor C 2, inductance L 1, the other end connecting resistance R2 of inductance L 1, another termination DC power supply+5V of resistance R 2, another termination capacitor C 3 of capacitor C 2, the input of the first low noise amplification pipe U1, the other end connecting resistance R3 of capacitor C 3, the grounding leg ground connection of described the first low noise amplification pipe U1, the other end of the output connecting resistance R3 of described the first low noise amplification pipe U1, inductance L 2, capacitor C 5, the emitter of another termination triode V2 of inductance L 2, capacitor C 4, the other end ground connection of capacitor C 4, another termination radio frequency of capacitor C 5 switches the 5th pin of chip U3, the positive pole of described the second light-receiving PIN pipe D2 connects capacitor C 7, resistance R 4, capacitor C 7, the other end ground connection of resistance R 4, the negative pole of described the second light-receiving PIN pipe D2 connects inductance L 4, capacitor C 8, the other end connecting resistance R5 of inductance L 4, another termination DC power supply+5V of resistance R 5, another termination capacitor C 9 of capacitor C 8, the input of the second low noise amplification pipe U2, the other end connecting resistance R6 of capacitor C 9, the grounding leg ground connection of described the second low noise amplification pipe U2, the other end of the output connecting resistance R6 of described the second low noise amplification pipe U2, inductance L 3, capacitor C 10, the emitter of another termination triode V1 of inductance L 3, capacitor C 11, the other end ground connection of capacitor C 11, another termination radio frequency of capacitor C 10 switches the 8th pin of chip U3, described singlechip chip U4 the 3rd pin connects capacitor C 14, crystal oscillator G1, the other end ground connection of capacitor C 14, another termination capacitor C 15 of crystal oscillator G1, singlechip chip U4 the 4th pin, the other end ground connection of capacitor C 15, described singlechip chip U4 the 12nd pin ground connection, singlechip chip U4 the 26th pin connecting resistance R8, the base stage of triode V1, resistance R 10, another termination direct voltage+5V of resistance R 8, the collector electrode of triode V1 meets direct voltage+5V, the base stage of the other end triode V3 of resistance R 10, the grounded emitter of triode V3, the collector electrode connecting resistance R9 of triode V3, the base stage of triode V2, another termination direct voltage+5V of resistance R 9, the collector electrode of triode V2 meets direct voltage+5V, described singlechip chip U4 the 27th pin connects radio frequency and switches chip U3 the 2nd pin, described singlechip chip U4 the 28th pin meets direct voltage+5V, described singlechip chip U4 the 31st pin connecting resistance R7, electrochemical capacitor C12 negative pole, another termination capacitor C 13 of resistance R 7, ground connection, electrochemical capacitor C12 positive pole meets direct voltage+5V, the other end of capacitor C 13, described radio frequency switches chip U3 the 1st pin and meets direct voltage+3V, and radio frequency switches chip U3 the 3rd, 6,7 pin ground connection, and radio frequency switches chip U3 the 4th pin and connects capacitor C 6, the other end output radiofrequency signal of capacitor C 6.
The beneficial effects of the utility model: this circuit adopts the general low-cost components and parts in market, realizes the switching of two-way light receiving signal, more than two-way light receiving signal isolation reaches 50dB.
Accompanying drawing explanation
Fig. 1 is theory diagram of the present utility model.
Fig. 2 is circuit theory diagrams of the present utility model.
Embodiment
Below in conjunction with specific embodiment, the utility model is further described, but the utility model is not confined to these embodiments.One skilled in the art would recognize that the utility model contained all alternatives, improvement project and the equivalents that within the scope of claims, may comprise.
Referring to Fig. 1, Fig. 2, a kind of Single-chip Controlling two-way light-receiving high-isolation commutation circuit, the the first light-receiving PIN pipe and the second light-receiving PIN pipe that comprise the light signal that receives input, the output of described the first light-receiving PIN pipe is connected with the input of the first low noise amplification pipe, the output of described the second light-receiving PIN pipe is connected with the input of the second low noise amplification pipe, the output of described the first low noise amplification pipe is connected with passage one input port that the radio frequency of output radiofrequency signal switches chip, the output of described the second low noise amplification pipe is connected with passage two input ports that the radio frequency of output radiofrequency signal switches chip, the singlechip chip that described radio frequency switches switching between chip and control channel one and passage two is connected, described the first low noise amplification pipe and the second low noise amplification Guan Junyu come to be respectively connected to the singlechip chip of its power supply by the different triodes of conducting.
Single-chip Controlling two-way light-receiving high-isolation commutation circuit, comprises that light-receiving PIN pipe D1-D2, low noise amplification pipe U1-U2, radio frequency switch chip U3, singlechip chip U4, triode V1-V3, crystal oscillator G1, resistance R 1-R10, capacitor C 1-C15, inductance L 1-L4.Wherein U1-U2 is that ASL380 low noise amplification pipe, U3 are that PE4231 radio frequency switches chip, U4 is STC12C5205AD singlechip chip.The positive pole of described the first light-receiving PIN pipe D1 connects capacitor C 1, resistance R 1, capacitor C 1, the other end ground connection of resistance R 1, the negative pole of described the first light-receiving PIN pipe D1 connects capacitor C 2, inductance L 1, the other end connecting resistance R2 of inductance L 1, another termination DC power supply+5V of resistance R 2, another termination capacitor C 3 of capacitor C 2, the input of the first low noise amplification pipe U1, the other end connecting resistance R3 of capacitor C 3, the grounding leg ground connection of described the first low noise amplification pipe U1, the other end of the output connecting resistance R3 of described the first low noise amplification pipe U1, inductance L 2, capacitor C 5, the emitter of another termination triode V2 of inductance L 2, capacitor C 4, the other end ground connection of capacitor C 4, another termination radio frequency of capacitor C 5 switches the 5th pin of chip U3, the positive pole of described the second light-receiving PIN pipe D2 connects capacitor C 7, resistance R 4, capacitor C 7, the other end ground connection of resistance R 4, the negative pole of described the second light-receiving PIN pipe D2 connects inductance L 4, capacitor C 8, the other end connecting resistance R5 of inductance L 4, another termination DC power supply+5V of resistance R 5, another termination capacitor C 9 of capacitor C 8, the input of the second low noise amplification pipe U2, the other end connecting resistance R6 of capacitor C 9, the grounding leg ground connection of described the second low noise amplification pipe U2, the other end of the output connecting resistance R6 of described the second low noise amplification pipe U2, inductance L 3, capacitor C 10, the emitter of another termination triode V1 of inductance L 3, capacitor C 11, the other end ground connection of capacitor C 11, another termination radio frequency of capacitor C 10 switches the 8th pin of chip U3, singlechip chip U4 the 1st, 2, 5-11, 13-25, 29, 30, 32 pins are unsettled, and described singlechip chip U4 the 3rd pin connects capacitor C 14, crystal oscillator G1, the other end ground connection of capacitor C 14, another termination capacitor C 15 of crystal oscillator G1, singlechip chip U4 the 4th pin, the other end ground connection of capacitor C 15, described singlechip chip U4 the 12nd pin ground connection, singlechip chip U4 the 26th pin connecting resistance R8, the base stage of triode V1, resistance R 10, another termination direct voltage+5V of resistance R 8, the collector electrode of triode V1 meets direct voltage+5V, the base stage of the other end triode V3 of resistance R 10, the grounded emitter of triode V3, the collector electrode connecting resistance R9 of triode V3, the base stage of triode V2, another termination direct voltage+5V of resistance R 9, the collector electrode of triode V2 meets direct voltage+5V, described singlechip chip U4 the 27th pin connects radio frequency and switches chip U3 the 2nd pin, described singlechip chip U4 the 28th pin meets direct voltage+5V, described singlechip chip U4 the 31st pin connecting resistance R7, electrochemical capacitor C12 negative pole, another termination capacitor C 13 of resistance R 7, ground connection, electrochemical capacitor C12 positive pole meets direct voltage+5V, the other end of capacitor C 13, described radio frequency switches chip U3 the 1st pin and meets direct voltage+3V, and radio frequency switches chip U3 the 3rd, 6,7 pin ground connection, and radio frequency switches chip U3 the 4th pin and connects capacitor C 6, the other end output radiofrequency signal of capacitor C 6.
The course of work of the present utility model, the first light-receiving PIN pipe D1 receives the light signal of input, demodulates the radiofrequency signal of 1000MHz bandwidth, and the first low noise amplification pipe U1 receives this signal and amplifies the 5th pin radio frequency input pin that rear input radio frequency switches chip U3; The second light-receiving PIN pipe D2 receives the light signal of input, demodulates the radiofrequency signal of 1000MHz bandwidth, and the second low noise amplification pipe U2 receives this signal and amplifies the 8th pin radio frequency input pin that rear input radio frequency switches chip U3; Singlechip chip U4 the 27th pin output high level, radio frequency switching chip U3 is switched to the 8th pin, is communicated with the 8th pin and the 4th pin, inputs the radiofrequency signal of the 8th pin and exports by the 4th pin; Singlechip chip U4 the 27th pin output low level, radio frequency switching chip U3 is switched to the 5th pin, is communicated with the 5th pin and the 4th pin, inputs the radiofrequency signal of the 5th pin and exports by the 4th pin.Singlechip chip U4 the 26th pin output high level, triode V1 conducting, collector electrode by triode V1 is powered to the second low noise amplification pipe U2, the second low noise amplification pipe U2 normal operation, triode V3 conducting, the collector electrode low level of triode V3, triode V2 cut-off, stop the first low noise amplification pipe U1 power supply, the first low noise amplification pipe U1 quits work.Singlechip chip U4 the 26th pin output end level, triode V1 cut-off, stop the second low noise amplification pipe U2 power supply, the second low noise amplification pipe U2 quits work, triode V3 cut-off, the collector electrode high level of triode V3, triode V2 conducting, emitter by triode V2 is powered to the first low noise amplification pipe U1, the first low noise amplification pipe U1 normal operation.
When the signal that need to select the first light-receiving PIN pipe D1 to receive switches output, singlechip chip U4 the 26th pin output end level, the 27th pin output low level.Singlechip chip U4 the 26th pin output end level, the first low noise amplification pipe U1 normal operation, the second low noise amplification pipe U2 quits work.Singlechip chip U4 the 27th pin output low level, radio frequency switching chip U3 is switched to the 5th pin, is communicated with the 5th pin and the 4th pin, inputs the radiofrequency signal of the 5th pin and exports by the 4th pin.Like this, the signal that the first light-receiving PIN pipe D1 receives switches chip U3 by radio frequency and switches output after the first low noise amplification pipe U1 amplifies; The second low noise amplification pipe U2 quits work, the signal that the second light-receiving PIN pipe D2 receives is through more than the second low noise amplification pipe U2 decay 30dB, add the isolation 20-30dB of radio frequency switching chip U3, two-way light receiving signal isolation is greater than the requirement of 40dB more than reaching 50dB far above isolation.The second low noise amplification pipe U2 another benefit of bringing that quits work is to reduce power consumption, plays energy-conservation effect.
In like manner, when the signal that need to select the second light-receiving PIN pipe D2 to receive switches output, singlechip chip U4 the 26th pin output high level, the 27th pin output high level.Singlechip chip U4 the 26th pin output high level, the second low noise amplification pipe U2 normal operation, the first low noise amplification pipe U1 quits work.Singlechip chip U4 the 27th pin output high level, radio frequency switching chip U3 is switched to the 8th pin, is communicated with the 8th pin and the 4th pin, inputs the radiofrequency signal of the 8th pin and exports by the 4th pin.Like this, the signal that the second light-receiving PIN pipe D2 receives switches chip U3 by radio frequency and switches output after the second low noise amplification pipe U2 amplifies; The first low noise amplification pipe U1 quits work, the signal that the first light-receiving PIN pipe D1 receives is through more than the first low noise amplification pipe U1 decay 30dB, add the isolation 20-30dB of radio frequency switching chip U3, two-way light receiving signal isolation is greater than the requirement of 40dB more than reaching 50dB far above isolation.The first low noise amplification pipe U1 another benefit of bringing that quits work is to reduce power consumption, plays energy-conservation effect.
Claims (2)
1. a Single-chip Controlling two-way light-receiving high-isolation commutation circuit, it is characterized in that: the first light-receiving PIN pipe and the second light-receiving PIN pipe that comprise the light signal that receives input, the output of described the first light-receiving PIN pipe is connected with the input of the first low noise amplification pipe, the output of described the second light-receiving PIN pipe is connected with the input of the second low noise amplification pipe, the output of described the first low noise amplification pipe is connected with passage one input port that the radio frequency of output radiofrequency signal switches chip, the output of described the second low noise amplification pipe is connected with passage two input ports that the radio frequency of output radiofrequency signal switches chip, the singlechip chip that described radio frequency switches switching between chip and control channel one and passage two is connected, described the first low noise amplification pipe and the second low noise amplification Guan Junyu come to be respectively connected to the singlechip chip of its power supply by the different triodes of conducting.
2. a kind of Single-chip Controlling two-way light-receiving high-isolation commutation circuit according to claim 1, it is characterized in that: the positive pole of described the first light-receiving PIN pipe D1 connects capacitor C 1, resistance R 1, capacitor C 1, the other end ground connection of resistance R 1, the negative pole of described the first light-receiving PIN pipe D1 connects capacitor C 2, inductance L 1, the other end connecting resistance R2 of inductance L 1, another termination DC power supply+5V of resistance R 2, another termination capacitor C 3 of capacitor C 2, the input of the first low noise amplification pipe U1, the other end connecting resistance R3 of capacitor C 3, the grounding leg ground connection of described the first low noise amplification pipe U1, the other end of the output connecting resistance R3 of described the first low noise amplification pipe U1, inductance L 2, capacitor C 5, the emitter of another termination triode V2 of inductance L 2, capacitor C 4, the other end ground connection of capacitor C 4, another termination radio frequency of capacitor C 5 switches the 5th pin of chip U3, the positive pole of described the second light-receiving PIN pipe D2 connects capacitor C 7, resistance R 4, capacitor C 7, the other end ground connection of resistance R 4, the negative pole of described the second light-receiving PIN pipe D2 connects inductance L 4, capacitor C 8, the other end connecting resistance R5 of inductance L 4, another termination DC power supply+5V of resistance R 5, another termination capacitor C 9 of capacitor C 8, the input of the second low noise amplification pipe U2, the other end connecting resistance R6 of capacitor C 9, the grounding leg ground connection of described the second low noise amplification pipe U2, the other end of the output connecting resistance R6 of described the second low noise amplification pipe U2, inductance L 3, capacitor C 10, the emitter of another termination triode V1 of inductance L 3, capacitor C 11, the other end ground connection of capacitor C 11, another termination radio frequency of capacitor C 10 switches the 8th pin of chip U3, described singlechip chip U4 the 3rd pin connects capacitor C 14, crystal oscillator G1, the other end ground connection of capacitor C 14, another termination capacitor C 15 of crystal oscillator G1, singlechip chip U4 the 4th pin, the other end ground connection of capacitor C 15, described singlechip chip U4 the 12nd pin ground connection, singlechip chip U4 the 26th pin connecting resistance R8, the base stage of triode V1, resistance R 10, another termination direct voltage+5V of resistance R 8, the collector electrode of triode V1 meets direct voltage+5V, the base stage of the other end triode V3 of resistance R 10, the grounded emitter of triode V3, the collector electrode connecting resistance R9 of triode V3, the base stage of triode V2, another termination direct voltage+5V of resistance R 9, the collector electrode of triode V2 meets direct voltage+5V, described singlechip chip U4 the 27th pin connects radio frequency and switches chip U3 the 2nd pin, described singlechip chip U4 the 28th pin meets direct voltage+5V, described singlechip chip U4 the 31st pin connecting resistance R7, electrochemical capacitor C12 negative pole, another termination capacitor C 13 of resistance R 7, ground connection, electrochemical capacitor C12 positive pole meets direct voltage+5V, the other end of capacitor C 13, described radio frequency switches chip U3 the 1st pin and meets direct voltage+3V, and radio frequency switches chip U3 the 3rd, 6,7 pin ground connection, and radio frequency switches chip U3 the 4th pin and connects capacitor C 6, the other end output radiofrequency signal of capacitor C 6.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320354540.0U CN203416269U (en) | 2013-06-19 | 2013-06-19 | Single-chip microcomputer controlled double-way light reception high-isolation switching circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201320354540.0U CN203416269U (en) | 2013-06-19 | 2013-06-19 | Single-chip microcomputer controlled double-way light reception high-isolation switching circuit |
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| CN203416269U true CN203416269U (en) | 2014-01-29 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103338078A (en) * | 2013-06-19 | 2013-10-02 | 浙江省广电科技股份有限公司 | Singlechip-controlled double-way light reception high isolation switching circuit |
-
2013
- 2013-06-19 CN CN201320354540.0U patent/CN203416269U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103338078A (en) * | 2013-06-19 | 2013-10-02 | 浙江省广电科技股份有限公司 | Singlechip-controlled double-way light reception high isolation switching circuit |
| CN103338078B (en) * | 2013-06-19 | 2016-09-28 | 浙江省广电科技股份有限公司 | A kind of Singlechip-controlledouble-way double-way light reception high isolation switching circuit |
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Granted publication date: 20140129 |