CN103338078B - A kind of Singlechip-controlledouble-way double-way light reception high isolation switching circuit - Google Patents
A kind of Singlechip-controlledouble-way double-way light reception high isolation switching circuit Download PDFInfo
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- CN103338078B CN103338078B CN201310249904.3A CN201310249904A CN103338078B CN 103338078 B CN103338078 B CN 103338078B CN 201310249904 A CN201310249904 A CN 201310249904A CN 103338078 B CN103338078 B CN 103338078B
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Abstract
nullA kind of Singlechip-controlledouble-way double-way light reception high isolation switching circuit，The first light-receiving PIN pipe including the optical signal receiving input is managed with the second light-receiving PIN，The outfan of described first light-receiving PIN pipe and the input of the first low noise amplification pipe connect，The outfan of described second light-receiving PIN pipe and the input of the second low noise amplification pipe connect，The outfan of described first low noise amplification pipe is connected with passage one input port of the radio frequency switching chip of output radiofrequency signal，The outfan of described second low noise amplification pipe is connected with passage two input port of the radio frequency switching chip of output radiofrequency signal，Described radio frequency switching chip is connected with controlling the singlechip chip of switching between passage one and passage two，The singlechip chip that described first low noise amplification pipe and the second low noise amplification Guan Junyu are supplied power for respectively by the different audion of conducting connects.This circuit cost is low, and double-way light reception Signal segregation degree reaches more than 50dB.
Description
Technical field
The invention belongs to cable television technology field, relate to a kind of single-chip microcomputer being applied to cable television network optical receiver
Control double-way light reception high isolation switching circuit.
Background technology
Along with the continuous propelling of the integration of three networks, cable TV network reliability requirement is improved constantly, there is active and standby cutting
The double light input photoreceiver application changing function is more and more extensive.On the one hand, along with enriching constantly of transmission program, cable television
Network bandwidth is constantly widened, and is upgraded to 860MHz from 750MHz and is upgraded to 1000MHz again.Frequency is the highest, radio frequency switching core
The isolation of sheet is the poorest.Conventional radio frequency switching chip application is in the photoreceiver of 1000MHz bandwidth, and its isolation generally exists
20-30dB.From 40dB insulated degree requirement difference far.During especially modulus mixes the cable TV network of biography, this problem seems
Especially prominent, owing to isolation is inadequate, between two-way light receiving signal, produce serious crosstalk, ghost image is existing to cause simulated television to occur
As, there is mosaic phenomenon in DTV.On the other hand, along with the network Development of light entering and copper back, the deployment of photoreceiver more comes
The closer to user side, quantity gets more and more, and cost control requires more and more higher.How one not only low cost is provided but also height can be realized
The double-way light reception machine of isolation switching, is the problem being badly in need of at present solving.
Summary of the invention
The invention solves the problems that the low bandwidth of existing double-way light reception machine product, low isolation switch defect, it is provided that a kind of
Low cost, the Singlechip-controlledouble-way double-way light reception high isolation switching circuit of high-isolation.
The technical solution used in the present invention is:
A kind of Singlechip-controlledouble-way double-way light reception high isolation switching circuit, it is characterised in that: include the light receiving input
First light-receiving PIN pipe of signal and the second light-receiving PIN pipe, the outfan of described first light-receiving PIN pipe and the first low noise
The input of sound amplifier tube connects, and the outfan of described second light-receiving PIN pipe and the input of the second low noise amplification pipe are even
Connecing, the outfan of described first low noise amplification pipe connects with passage one input port of the radio frequency switching chip of output radiofrequency signal
Connecing, the outfan of described second low noise amplification pipe connects with passage two input port of the radio frequency switching chip of output radiofrequency signal
Connecing, described radio frequency switching chip is connected with controlling the singlechip chip of switching between passage one and passage two, described first low noise
The singlechip chip that sound amplifier tube and the second low noise amplification Guan Junyu are supplied power for respectively by the different audion of conducting connects
Connect.
Further, the positive pole of described first light-receiving PIN pipe D1 meets electric capacity C1, resistance R1, electric capacity C1, resistance R1 another
End ground connection, the negative pole of described first light-receiving PIN pipe D1 meets electric capacity C2, inductance L1, the other end connecting resistance R2 of inductance L1, resistance
Another termination another termination capacitor C3 of DC source+5V, electric capacity C2, input of the first low noise amplification pipe U1 of R2, electricity
Hold the other end connecting resistance R3 of C3, the grounding leg ground connection of described first low noise amplification pipe U1, described first low noise amplification pipe
The other end of outfan connecting resistance R3 of U1, inductance L2, electric capacity C5, another termination emitter stage of audion V2, electricity of inductance L2
Hold the other end ground connection of C4, electric capacity C4, the RF2 foot of another termination radio frequency switching chip U3 of electric capacity C5；Described second light-receiving
The positive pole of PIN pipe D2 meets electric capacity C7, resistance R4, electric capacity C7, the other end ground connection of resistance R4, described second light-receiving PIN pipe D2
Negative pole meet inductance L4, electric capacity C8, the other end connecting resistance R5, resistance R5 of inductance L4 another termination DC source+5V, electric capacity
Another termination capacitor C9 of C8, the input of the second low noise amplification pipe U2, the other end connecting resistance R6 of electric capacity C9, described second
The grounding leg ground connection of low noise amplification pipe U2, the other end of outfan connecting resistance R6 of described second low noise amplification pipe U2, electricity
Sense L3, electric capacity C10, another termination emitter stage of audion V1, the electric capacity C11 of inductance L3, the other end ground connection of electric capacity C11, electricity
Hold the RF1 foot of another termination radio frequency switching chip U3 of C10；The XTAL2 foot of described singlechip chip U4 connects electric capacity C14, crystal oscillator
The other end ground connection of G1, electric capacity C14, another termination capacitor C15 of crystal oscillator G1, the XTAL1 foot of singlechip chip U4, electric capacity
The other end ground connection of C15, the GND foot ground connection of described singlechip chip U4, the P2.0 foot connecting resistance R8 of singlechip chip U4,
The base stage of audion V1, resistance R10, another termination DC voltage+5V of resistance R8, the colelctor electrode of audion V1 connects direct current
The base stage of the other end audion V3 of voltage+5V, resistance R10, the grounded emitter of audion V3, the current collection of audion V3
Pole connecting resistance R9, the base stage of audion V2, another termination DC voltage+5V of resistance R9, the colelctor electrode of audion V2 connects directly
Stream voltage+5V, the P2.1 foot of described singlechip chip U4 connects the CRT foot of radio frequency switching chip U3, described singlechip chip U4's
VCC foot connects the RST foot connecting resistance R7 of DC voltage+5V, described singlechip chip U4, electrochemical capacitor C12 negative pole, resistance R7's
Another termination capacitor C13, ground connection, electrochemical capacitor C12 positive pole connects DC voltage+5V, the other end of electric capacity C13；Described radio frequency
The VDD foot of switching chip U3 meets DC voltage+3V, and the equal ground connection of GND foot of radio frequency switching chip U3, radio frequency switches chip U3's
RFC foot connects the other end output radiofrequency signal of electric capacity C6, electric capacity C6.Beneficial effects of the present invention: this circuit uses market to lead to
Low cost components and parts, it is achieved the switching of double-way light reception signal, double-way light reception Signal segregation degree reaches more than 50dB.
Accompanying drawing explanation
Fig. 1 is the theory diagram of the present invention.
Fig. 2 is the circuit theory diagrams of the present invention.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is further described, but does not limit the invention to these tools
Body embodiment.One skilled in the art would recognize that present invention encompasses and potentially included in Claims scope
All alternatives, improvement project and equivalents.
Seeing Fig. 1, Fig. 2, a kind of Singlechip-controlledouble-way double-way light reception high isolation switching circuit, including the light receiving input
First light-receiving PIN pipe of signal and the second light-receiving PIN pipe, the outfan of described first light-receiving PIN pipe and the first low noise
The input of sound amplifier tube connects, and the outfan of described second light-receiving PIN pipe and the input of the second low noise amplification pipe are even
Connecing, the outfan of described first low noise amplification pipe connects with passage one input port of the radio frequency switching chip of output radiofrequency signal
Connecing, the outfan of described second low noise amplification pipe connects with passage two input port of the radio frequency switching chip of output radiofrequency signal
Connecing, described radio frequency switching chip is connected with controlling the singlechip chip of switching between passage one and passage two, described first low noise
The singlechip chip that sound amplifier tube and the second low noise amplification Guan Junyu are supplied power for respectively by the different audion of conducting connects
Connect.
Singlechip-controlledouble-way double-way light reception high isolation switching circuit, including light-receiving PIN pipe D1-D2, low noise amplification
Pipe U1-U2, radio frequency switching chip U3, singlechip chip U4, audion V1-V3, crystal oscillator G1, resistance R1-R10, electric capacity C1-C15,
Inductance L1-L4.Wherein U1-U2 be ASL380 low noise amplification pipe, U3 be that PE4231 radio frequency switching chip, U4 are
STC12C5205AD singlechip chip.The positive pole of described first light-receiving PIN pipe D1 connects electric capacity C1, resistance R1, electric capacity C1, resistance
The other end ground connection of R1, the negative pole of described first light-receiving PIN pipe D1 meets electric capacity C2, inductance L1, another termination electricity of inductance L1
Another termination another termination capacitor C3 of DC source+5V, electric capacity C2, first low noise amplification pipe U1 of resistance R2, resistance R2
Input, the other end connecting resistance R3 of electric capacity C3, the grounding leg ground connection of described first low noise amplification pipe U1, described first low noise
The other end of outfan connecting resistance R3 of sound amplifier tube U1, inductance L2, electric capacity C5, another termination audion V2 of inductance L2 sends out
Emitter-base bandgap grading, electric capacity C4, the other end ground connection of electric capacity C4, the RF2 foot of another termination radio frequency switching chip U3 of electric capacity C5；Described second
The positive pole of light-receiving PIN pipe D2 connects electric capacity C7, resistance R4, electric capacity C7, the other end ground connection of resistance R4, described second light-receiving
The negative pole of PIN pipe D2 meets inductance L4, electric capacity C8, and another termination DC source of the other end connecting resistance R5, resistance R5 of inductance L4+
Another termination capacitor C9 of 5V, electric capacity C8, the input of the second low noise amplification pipe U2, the other end connecting resistance R6 of electric capacity C9,
The grounding leg ground connection of described second low noise amplification pipe U2, the outfan connecting resistance R6's of described second low noise amplification pipe U2 is another
One end, inductance L3, electric capacity C10, another termination emitter stage of audion V1, the electric capacity C11 of inductance L3, the other end of electric capacity C11
Ground connection, the RF1 foot of another termination radio frequency switching chip U3 of electric capacity C10；P0.0-P0.3, P1.0-of singlechip chip U4
P1.7, P2.2.0-P2.7, P3.0-P3.5, P3.7 pin is unsettled, the XTAL2 foot of described singlechip chip U4 connect electric capacity C14,
The other end ground connection of crystal oscillator G1, electric capacity C14, another termination capacitor C15 of crystal oscillator G1, the XTAL1 foot of singlechip chip U4,
The other end ground connection of electric capacity C15, the GND foot ground connection of described singlechip chip U4, the P2.0 foot connecting resistance of singlechip chip U4
R8, the base stage of audion V1, resistance R10, another termination DC voltage+5V of resistance R8, the colelctor electrode of audion V1 connects directly
The base stage of the other end audion V3 of stream voltage+5V, resistance R10, the grounded emitter of audion V3, the collection of audion V3
Electrode connecting resistance R9, the base stage of audion V2, another termination DC voltage+5V of resistance R9, the colelctor electrode of audion V2 connects
DC voltage+5V, the P2.1 foot of described singlechip chip U4 meets the CRT foot of radio frequency switching chip U3, described singlechip chip U4
VCC foot meet the RST foot connecting resistance R7 of DC voltage+5V, described singlechip chip U4, electrochemical capacitor C12 negative pole, resistance R7
Another termination capacitor C13, ground connection, electrochemical capacitor C12 positive pole connects DC voltage+5V, the other end of electric capacity C13；Described penetrate
The VDD foot of frequency switching chip U3 meets DC voltage+3V, and the equal ground connection of GND foot of radio frequency switching chip U3, radio frequency switches chip U3's
RFC foot connects the other end output radiofrequency signal of electric capacity C6, electric capacity C6.
The work process of the present invention, the first light-receiving PIN pipe D1 receives the optical signal of input, demodulates 1000MHz bandwidth
Radiofrequency signal, the first low noise amplification pipe U1 receive this signal be amplified rear input radio frequency switching chip U3 RF2 foot penetrate
Frequently input pin；Second light-receiving PIN pipe D2 receives the optical signal of input, demodulates the radiofrequency signal of 1000MHz bandwidth, and second is low
Noise amplifier tube U2 receives this signal and is amplified the RF1 foot radio frequency input pin of rear input radio frequency switching chip U3；Monolithic movement
The P2.1 foot output high level of sheet U4, then radio frequency switching chip U3 is switched to RF1 foot, connection RF1 foot and RFC foot, inputs RF1 foot
Radiofrequency signal exported by RFC foot；The P2.1 foot output low level of singlechip chip U4, then radio frequency switching chip U3 is switched to
RF2 foot, connection RF2 foot and RFC foot, the radiofrequency signal of input RF2 foot is exported by RFC foot.The P2.0 foot of singlechip chip U4
Output high level, then audion V1 conducting, is powered to the second low noise amplification pipe U2 by the colelctor electrode of audion V1, and second is low
Noise amplifier tube U2 normally works, and audion V3 turns on, the colelctor electrode low level of audion V3, and audion V2 ends, and it is right to stop
First low noise amplification pipe U1 powers, and the first low noise amplification pipe U1 quits work.The P2.0 foot output end of singlechip chip U4
Level, then audion V1 cut-off, stop powering the second low noise amplification pipe U2, and the second low noise amplification pipe U2 quits work,
Audion V3 ends, the colelctor electrode high level of audion V3, and audion V2 turns on, low to first by the emitter stage of audion V2
Noise amplifier tube U1 powers, and the first low noise amplification pipe U1 normally works.
When needing the signal switching output selecting the first light-receiving PIN pipe D1 to receive, the P2.0 foot of singlechip chip U4
Output end level, P2.1 foot output low level.The P2.0 foot output end level of singlechip chip U4, the first low noise amplification pipe U1
Normal work, the second low noise amplification pipe U2 quits work.The P2.1 foot output low level of singlechip chip U4, then radio frequency switching
Chip U3 is switched to RF2 foot, connection RF2 foot and RFC foot, and the radiofrequency signal of input RF2 foot is exported by RFC foot.So, first
The signal that light-receiving PIN pipe D1 receives is exported by radio frequency switching chip U3 switching after the first low noise amplification pipe U1 amplifies；
Second low noise amplification pipe U2 quits work, and the signal that the second light-receiving PIN pipe D2 receives is through the second low noise amplification pipe U2
Decay more than 30dB, adds the isolation 20-30dB of radio frequency switching chip U3, and double-way light reception Signal segregation degree reaches 50dB
Above, the requirement of 40dB it is more than far above isolation.Second low noise amplification pipe U2 another benefit brought that quits work is can
To reduce power consumption, play energy-conservation effect.
In like manner, when needing the signal switching output selecting the second light-receiving PIN pipe D2 to receive, singlechip chip U4's
P2.0 foot output high level, P2.1 foot output high level.The P2.0 foot output high level of singlechip chip U4, the second low noise is put
Big pipe U2 normally works, and the first low noise amplification pipe U1 quits work.The P2.1 foot output high level of singlechip chip U4, then penetrate
Frequency switching chip U3 is switched to RF1 foot, connection RF1 foot and RFC foot, and the radiofrequency signal of input RF1 foot is exported by RFC foot.This
Sample, the signal that the second light-receiving PIN pipe D2 receives is cut by radio frequency switching chip U3 after the second low noise amplification pipe U2 amplifies
Change output；First low noise amplification pipe U1 quits work, and the signal that the first light-receiving PIN pipe D1 receives is put through the first low noise
Big pipe U1 decay more than 30dB, adds the isolation 20-30dB of radio frequency switching chip U3, and double-way light reception Signal segregation degree reaches
To more than 50dB, far above the isolation requirement more than 40dB.First low noise amplification pipe U1 quit work bring another is good
Place is to reduce power consumption, plays energy-conservation effect.
Claims (1)
1. a Singlechip-controlledouble-way double-way light reception high isolation switching circuit, it is characterised in that: include the light letter receiving input
Number first light-receiving PIN pipe and second light-receiving PIN pipe, the outfan of described first light-receiving PIN pipe and the first low noise
The input of sound amplifier tube connects, and the outfan of described second light-receiving PIN pipe and the input of the second low noise amplification pipe are even
Connecing, the outfan of described first low noise amplification pipe connects with passage one input port of the radio frequency switching chip of output radiofrequency signal
Connecing, the outfan of described second low noise amplification pipe connects with passage two input port of the radio frequency switching chip of output radiofrequency signal
Connecing, described radio frequency switching chip is connected with controlling the singlechip chip of switching between passage one and passage two, described first low noise
The singlechip chip that sound amplifier tube and the second low noise amplification Guan Junyu are supplied power for respectively by the different audion of conducting connects
Connect；The positive pole of described first light-receiving PIN pipe D1 meets electric capacity C1, resistance R1, electric capacity C1, the other end ground connection of resistance R1, institute
The negative pole stating the first light-receiving PIN pipe D1 meets electric capacity C2, inductance L1, the other end connecting resistance R2 of inductance L1, resistance R2's
Another terminates another termination capacitor C3 of DC source+5V, electric capacity C2, the input of the first low noise amplification pipe U1, electric capacity
The other end connecting resistance R3 of C3, the grounding leg ground connection of described first low noise amplification pipe U1, described first low noise amplification pipe
The other end of outfan connecting resistance R3 of U1, inductance L2, electric capacity C5, inductance L2 another termination audion V2 emitter stage,
The other end ground connection of electric capacity C4, electric capacity C4, the RF2 foot of another termination radio frequency switching chip U3 of electric capacity C5；Described second light
The positive pole receiving PIN pipe D2 connects electric capacity C7, resistance R4, electric capacity C7, the other end ground connection of resistance R4, described second light-receiving
The negative pole of PIN pipe D2 meets inductance L4, electric capacity C8, another termination direct current of the other end connecting resistance R5, resistance R5 of inductance L4
Another termination capacitor C9 of power supply+5V, electric capacity C8, the input of the second low noise amplification pipe U2, another termination of electric capacity C9
Resistance R6, the grounding leg ground connection of described second low noise amplification pipe U2, the output termination of described second low noise amplification pipe U2
The other end of resistance R6, inductance L3, electric capacity C10, another termination emitter stage of audion V1, the electric capacity C11 of inductance L3, electricity
Hold the other end ground connection of C11, the RF1 foot of another termination radio frequency switching chip U3 of electric capacity C10；Described singlechip chip U4
XTAL2 foot meet electric capacity C14, crystal oscillator G1, the other end ground connection of electric capacity C14, another termination capacitor C15 of crystal oscillator G1, monolithic
The XTAL1 foot of movement sheet U4, the other end ground connection of electric capacity C15, the GND foot ground connection of described singlechip chip U4, monolithic movement
The P2.0 foot connecting resistance R8 of sheet U4, the base stage of audion V1, another termination DC voltage+5V of resistance R10, resistance R8, three
The colelctor electrode of pole pipe V1 connects the base stage of the other end audion V3 of DC voltage+5V, resistance R10, the transmitting of audion V3
Pole ground connection, the colelctor electrode connecting resistance R9 of audion V3, the base stage of audion V2, another termination DC voltage of resistance R9+
5V, the colelctor electrode of audion V2 meets DC voltage+5V, and the P2.1 foot of described singlechip chip U4 connects radio frequency switching chip U3's
CRT foot, the VCC foot of described singlechip chip U4 connects the RST foot connecting resistance R7 of DC voltage+5V, described singlechip chip U4, electricity
Solving electric capacity C12 negative pole, another termination capacitor C13 of resistance R7, ground connection, electrochemical capacitor C12 positive pole connects DC voltage+5V, electricity
Hold the other end of C13；The VDD foot of described radio frequency switching chip U3 meets DC voltage+3V, and the GND foot of radio frequency switching chip U3 is equal
Ground connection, the RFC foot of radio frequency switching chip U3 connects the other end output radiofrequency signal of electric capacity C6, electric capacity C6.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310249904.3A CN103338078B (en) | 2013-06-19 | 2013-06-19 | A kind of Singlechip-controlledouble-way double-way light reception high isolation switching circuit |
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| CN201310249904.3A CN103338078B (en) | 2013-06-19 | 2013-06-19 | A kind of Singlechip-controlledouble-way double-way light reception high isolation switching circuit |
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| CN103338078B true CN103338078B (en) | 2016-09-28 |
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| CN107196669A (en) * | 2017-06-22 | 2017-09-22 | 天津七六四通信导航技术有限公司 | A kind of implementation method of RF signal switch switching circuit |
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| CN101340244A (en) * | 2008-08-08 | 2009-01-07 | 宁波环球广电科技有限公司 | Optical receiving module |
| JP2011049960A (en) * | 2009-08-28 | 2011-03-10 | Dx Antenna Co Ltd | Optical terminal unit, and optical transmission system |
| CN201928289U (en) * | 2010-07-30 | 2011-08-10 | 天津赛思科技发展有限公司 | Output controller device for railway passenger transport broadcasting system |
| CN203416269U (en) * | 2013-06-19 | 2014-01-29 | 浙江省广电科技股份有限公司 | Single-chip microcomputer controlled double-way light reception high-isolation switching circuit |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101340244A (en) * | 2008-08-08 | 2009-01-07 | 宁波环球广电科技有限公司 | Optical receiving module |
| JP2011049960A (en) * | 2009-08-28 | 2011-03-10 | Dx Antenna Co Ltd | Optical terminal unit, and optical transmission system |
| CN201928289U (en) * | 2010-07-30 | 2011-08-10 | 天津赛思科技发展有限公司 | Output controller device for railway passenger transport broadcasting system |
| CN203416269U (en) * | 2013-06-19 | 2014-01-29 | 浙江省广电科技股份有限公司 | Single-chip microcomputer controlled double-way light reception high-isolation switching circuit |
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