CN206698105U - A kind of splicer SDI input power systems - Google Patents
A kind of splicer SDI input power systems Download PDFInfo
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- CN206698105U CN206698105U CN201720253367.3U CN201720253367U CN206698105U CN 206698105 U CN206698105 U CN 206698105U CN 201720253367 U CN201720253367 U CN 201720253367U CN 206698105 U CN206698105 U CN 206698105U
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- power
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- digital
- splicer
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Abstract
The utility model provides a kind of splicer SDI input power systems, chip is inputted including digital power, analog power and SDI, the digital power and the analog power connect the SDI inputs chip respectively, the digital power and the analog power are grounded respectively, the digital power and the analog power are respectively equipped with LDO, filter regulator circuit is respectively equipped between the digital power and the analog power and the SDI input chip, the digital power and the analog power are grounded respectively by the filter regulator circuit.The utility model provides the power supply signal of low noise, low ripple for SDI inputs, makes signal circuit more stable.
Description
Technical field
The utility model belongs to splicer technical field, and in particular to a kind of splicer SDI input power systems.
Background technology
SDI has strict requirements to eye pattern, shake, noise etc., and the Power Management Design scheme of low noise low ripple is to sdi signal
Link is extremely important.Any noise and ripple can all be directly coupled to output signal end on power supply, SMPTE specifications output electricity
Pressure amplitude degree representative value is 800mV, and 3G SDI can at most be attenuated 50dB after 200 meters of cable transmission, and low frequency
Power supply noise and ripple almost do not decay after long cable, it means that sdi signal amplitude by cable pass
After defeated can as little as several mV, this is very close with power supply noise and ripple, and now power supply is by the noise for the SDI that deteriorates significantly
Than.Therefore, power supply noise and ripple must be very low, rather than directly use DC/DC.The mould of existing SDI input powers system
Intend together with power supply and digital power ground, input also power unit integration, easily cause interference, input SDI unstable.
Utility model content
The purpose of this utility model is to provide a kind of splicer SDI input power systems, for SDI input provide low noise,
The power supply signal of low ripple, make signal circuit more stable.
The utility model provides following technical scheme：
A kind of splicer SDI input power systems, including digital power, analog power and SDI input chips, the numeral
Power supply and the analog power connect the SDI inputs chip respectively, and the digital power and the analog power are grounded respectively,
The digital power and the analog power are respectively equipped with LDO.
Preferably, it is respectively equipped with filtering surely between the digital power and the analog power and the SDI input chip
Volt circuit, the digital power and the analog power are grounded respectively by the filter regulator circuit, and power unit is digitally
With simulation separately connection, makes circuit more stable.
Preferably, the filter regulator circuit includes four electric capacity parallel with one another, and the electric capacity is in parallel respectively to access institute
State between digital power and the analog power and SDI input chips, voltage stabilizing is filtered to power supply signal.
Preferably, magnetic bead is additionally provided between the digital power and the analog power and the SDI input chip, be used for
Suppress signal wire, the high-frequency noise on power line and spike interference, also there is the ability for absorbing electrostatic pulse.
Preferably, the digital power includes 12V digital powers and 33V digital powers, connects the SDI inputs core respectively
Piece, input chip for the SDI and required digital power is provided respectively.
Preferably, the analog power includes 12V analog powers and 33V analog powers, connects the SDI inputs core respectively
Piece, input chip for the SDI and required analog power is provided respectively.
Preferably, the 12V digital powers and the 12V analog powers are respectively equipped with LDO, for reducing noise.
The beneficial effects of the utility model are：Control module is physically separately set digital power and analog power
Put, make circuit more stable；Power unit is digitally with simulation separated, while analog power part reduces noise using LDO.
Brief description of the drawings
Accompanying drawing is used for providing further understanding to of the present utility model, and a part for constitution instruction, with this practicality
New embodiment is used to explain the utility model together, does not form to limitation of the present utility model.In the accompanying drawings：
Fig. 1 is the utility model structure diagram；
Fig. 2 is the application principle figure of cable drive.
Embodiment
As shown in figure 1, a kind of splicer SDI input power systems, including digital power, analog power and SDI input cores
Piece, digital power and analog power connect SDI input chips respectively, and digital power and analog power are grounded respectively, digital power
It is respectively equipped with analog power between LDO, digital power and analog power and SDI input chips and is respectively equipped with filtering voltage regulation electricity
Road, digital power and analog power are grounded respectively by filter regulator circuit, power unit digitally with simulation separately connection,
Make circuit more stable.Filter regulator circuit includes four electric capacity parallel with one another, and electric capacity is in parallel respectively to access digital power and mould
Intend between power supply and SDI input chips, voltage stabilizing is filtered to power supply signal.Digital power and analog power and SDI input cores
Magnetic bead is additionally provided between piece, for suppressing signal wire, the high-frequency noise on power line and spike interference, also has and absorbs electrostatic arteries and veins
The ability of punching.Further, digital power includes 12V digital powers and 33V digital powers, connects SDI input chips respectively, is
SDI input chips provide required digital power respectively, and analog power includes 12V analog powers and 33V analog powers, connected respectively
SDI inputs chip, and input chip for SDI provides required analog power respectively, and 12V digital powers and 12V analog powers are set respectively
There is LDO, for reducing noise.
As shown in figure 1, SDI inputs have strict requirements to eye pattern, shake, noise etc., the power supply of low noise low ripple is set
Meter scheme is extremely important to sdi signal link, can be with as shown in Fig. 2 be the application principle figure of a typical cable drive
It is to be joined directly together by one 75 ohm of resistance with output end to find out power Vcc, therefore noise and line any on power supply
Ripple can all be directly coupled to output signal end.SMPTE specifications output voltage amplitude representative value is 800mV, and a 3GSDI passes through
50dB can be at most attenuated after 200 meters of cable transmission, and the power supply noise of low frequency and ripple are several after long cable
Do not decay, it means that sdi signal amplitude after cable transmission can as little as several mV, this and power supply noise and line
Ripple is very close, and now power supply is by the signal to noise ratio for the SDI that deteriorates significantly.Therefore, power supply noise and ripple must be very low, and use is low
The LDO (such as TI LP3878) of noise gives the power supply of all SDI devices, rather than directly use DC/DC, power unit digitally with
Simulation ground separates, while analog power part reduces noise using LDO.
Preferred embodiment of the present utility model is the foregoing is only, is not limited to the utility model, although ginseng
The utility model is described in detail according to previous embodiment, for those skilled in the art, it still can be with
Technical scheme described in foregoing embodiments is modified, or equivalent substitution is carried out to which part technical characteristic.It is all
Within the spirit and principles of the utility model, any modification, equivalent substitution and improvements made etc., this practicality should be included in
Within new protection domain.
Claims (7)
1. a kind of splicer SDI input power systems, it is characterised in that input core including digital power, analog power and SDI
Piece, the digital power and the analog power connect the SDI inputs chip, the digital power and the simulation electricity respectively
Source is grounded respectively, and the digital power and the analog power are respectively equipped with LDO.
A kind of 2. splicer SDI input power systems according to claim 1, it is characterised in that the digital power and
Filter regulator circuit, the digital power and the simulation are respectively equipped between the analog power and SDI input chips
Power supply is grounded respectively by the filter regulator circuit.
A kind of 3. splicer SDI input power systems according to claim 2, it is characterised in that the filtering voltage regulation electricity
Road includes four electric capacity parallel with one another, the electric capacity respectively it is in parallel access the digital power and the analog power with it is described
Between SDI input chips.
A kind of 4. splicer SDI input power systems according to claim 1, it is characterised in that the digital power and
Magnetic bead is additionally provided between the analog power and SDI input chips.
A kind of 5. splicer SDI input power systems according to claim 1, it is characterised in that the digital power bag
12V digital powers and 33V digital powers are included, connects the SDI inputs chip respectively.
A kind of 6. splicer SDI input power systems according to claim 1, it is characterised in that the analog power bag
12V analog powers and 33V analog powers are included, connects the SDI inputs chip respectively.
7. a kind of splicer SDI input power systems according to any one of claim 1 to 6, it is characterised in that described
12V digital powers and the 12V analog powers are respectively equipped with LDO, for reducing noise.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720253367.3U CN206698105U (en) | 2017-03-15 | 2017-03-15 | A kind of splicer SDI input power systems |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720253367.3U CN206698105U (en) | 2017-03-15 | 2017-03-15 | A kind of splicer SDI input power systems |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206698105U true CN206698105U (en) | 2017-12-01 |
Family
ID=60442440
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720253367.3U Active CN206698105U (en) | 2017-03-15 | 2017-03-15 | A kind of splicer SDI input power systems |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206698105U (en) |
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2017
- 2017-03-15 CN CN201720253367.3U patent/CN206698105U/en active Active
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